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Thyroglobulin interactome profiling defines altered proteostasis topology associated with thyroid dyshormonogenesis [Research]

Thyroglobulin (Tg) is a secreted iodoglycoprotein serving as the precursor for T3 and T4 hormones. Many characterized Tg gene mutations produce secretion-defective variants resulting in congenital hypothyroidism (CH). Tg processing and secretion is controlled by extensive interactions with chaperone, trafficking, and degradation factors comprising the secretory proteostasis network. While dependencies on individual proteostasis network components are known, the integration of proteostasis pathways mediating Tg protein quality control and the molecular basis of mutant Tg misprocessing remain poorly understood. We employ a multiplexed quantitative affinity purification–mass spectrometry approach to define the Tg proteostasis interactome and changes between WT and several CH-variants. Mutant Tg processing is associated with common imbalances in proteostasis engagement including increased chaperoning, oxidative folding, and engagement by targeting factors for ER-associated degradation (ERAD). Furthermore, we reveal mutation-specific changes in engagement with N-glycosylation components, suggesting distinct requirements for one Tg variant on dual engagement of both oligosaccharyltransferase complex isoforms for degradation. Modulating dysregulated proteostasis components and pathways may serve as a therapeutic strategy to restore Tg secretion and thyroid hormone biosynthesis.




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Proteome analysis reveals a significant host-specific response in Rhizobium leguminosarum bv viciae endosymbiotic cells [Research]

The Rhizobium-legume symbiosis is a beneficial interaction in which the bacterium converts atmospheric nitrogen into ammonia and delivers it to the plant in exchange for carbon compounds. This symbiosis implies the adaptation of bacteria to live inside host plant cells. In this work we apply RP-LC-MS/MS and  iTRAQ techniques to study the proteomic profile of endosymbiotic cells (bacteroids) induced by Rhizobium leguminosarum bv viciae strain UPM791 in legume nodules. Nitrogenase subunits, tricarboxylic acid cycle enzymes, and stress response proteins are amongst the most abundant from over one thousand rhizobial proteins identified in pea (Pisum sativum) bacteroids. Comparative analysis of bacteroids induced in pea and in lentil (Lens culinaris)nodules revealed the existence of a significant host-specific differential response affecting dozens of bacterial proteins, including stress-related proteins, transcriptional regulators, and proteins involved in the carbon and nitrogen metabolisms. A mutant affected in one of these proteins, homologous to a GntR-like transcriptional regulator, showed a symbiotic performance significantly  impaired in symbiosis with pea, but not with lentil plants. Analysis of the proteomes of bacteroids isolated from both hosts also revealed the presence of different sets of plant-derived nodule-specific cysteine rich (NCR) peptides, indicating that the endosymbiotic bacteria find a host-specific cocktail of chemical stressors inside the nodule. By studying variations of the bacterial response to different plant cell environments we will be able to identify specific limitations imposed by the host that might give us clues for the improvement of rhizobial performance.




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Proteogenomic characterization of the pathogenic fungus Aspergillus flavus reveals novel genes involved in aflatoxin production [Research]

Aspergillus flavus (A. flavus), a pathogenic fungus, can produce carcinogenic and toxic aflatoxins that are a serious agricultural and medical threat worldwide. Attempts to decipher the aflatoxin biosynthetic pathway have been hampered by the lack of a high-quality genome annotation for A. flavus. To address this gap, we performed a comprehensive proteogenomic analysis using high-accuracy mass spectrometry data for this pathogen. The resulting high-quality dataset confirmed the translation of 8,724 previously-predicted genes, and identified 732 novel proteins, 269 splice variants, 447 single amino acid variants, 188 revised genes. A subset of novel proteins was experimentally validated by RT-PCR and synthetic peptides. Further functional annotation suggested that a number of the identified novel proteins may play roles in aflatoxin biosynthesis and stress responses in A. flavus. This comprehensive strategy also identified a wide range of post-translational modifications (PTMs), including 3,461 modification sites from 1,765 proteins. Functional analysis suggested the involvement of these modified proteins in the regulation of cellular metabolic and aflatoxin biosynthetic pathways. Together, we provided a high quality annotation of A. flavus genome and revealed novel insights into the mechanisms of aflatoxin production and pathogenicity in this pathogen.




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Proteome Turnover in the Spotlight: Approaches, Applications & Perspectives [Review]

In all cells, proteins are continuously synthesized and degraded in order to maintain protein homeostasis and modify gene expression levels in response to stimuli. Collectively, the processes of protein synthesis and degradation are referred to as protein turnover. At steady state, protein turnover is constant to maintain protein homeostasis, but in dynamic responses, proteins change their rates of synthesis and degradation in order to adjust their proteomes to internal or external stimuli. Thus, probing the kinetics and dynamics of protein turnover lends insight into how cells regulate essential processes such as growth, differentiation, and stress response. Here we outline historical and current approaches to measuring the kinetics of protein turnover on a proteome-wide scale in both steady-state and dynamic systems, with an emphasis on metabolic tracing using stable-isotope-labeled amino acids. We highlight important considerations for designing proteome turnover experiments, key biological findings regarding the conserved principles of proteome turnover regulation, and future perspectives for both technological and biological investigation.




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Prediction and validation of mouse meiosis-essential genes based on spermatogenesis proteome dynamics [Research]

The molecular mechanism associated with mammalian meiosis has yet to be fully explored, and one of the main reasons for this lack of exploration is that some meiosis-essential genes are still unknown. The profiling of gene expression during spermatogenesis has been performed in previous studies, yet few studies have aimed to find new functional genes. Since there is a huge gap between the number of genes that are able to be quantified and the number of genes that can be characterized by phenotype screening in one assay, an efficient method to rank quantified genes according to phenotypic relevance is of great importance. We proposed to rank genes by the probability of their function in mammalian meiosis based on global protein abundance using machine learning. Here, nine types of germ cells focusing on continual substages of meiosis prophase I were isolated, and the corresponding proteomes were quantified by high-resolution mass spectrometry. By combining meiotic labels annotated from the MGI mouse knockout database and the spermatogenesis proteomics dataset, a supervised machine learning package, FuncProFinder, was developed to rank meiosis-essential candidates. Of the candidates whose functions were unannotated, four of ten genes with the top prediction scores, Zcwpw1, Tesmin, 1700102P08Rik and Kctd19, were validated as meiosis-essential genes by knockout mouse models. Therefore,  mammalian meiosis-essential genes could be efficiently predicted based on the protein abundance dataset, which provides a paradigm for other functional gene mining from a related abundance dataset.




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Proteomic analyses identify differentially expressed proteins and pathways between low-risk and high-risk subtypes of early-stage lung adenocarcinoma and their prognostic impacts [Research]

The histopathological subtype of lung adenocarcinoma (LUAD) is closely associated with prognosis. Micropapillary or solid predominant LUAD tends to relapse after surgery at an early stage, whereas lepidic pattern shows a favorable outcome. However, the molecular mechanism underlying this phenomenon remains unknown. Here, we recruited 31 lepidic predominant LUADs (LR: low-risk subtype group) and 28 micropapillary or solid predominant LUADs (HR: high-risk subtype group). Tissues of these cases were obtained and label-free quantitative proteomic and bioinformatic analyses were performed. Additionally, prognostic impact of targeted proteins was validated using The Cancer Genome Atlas databases (n=492) and tissue microarrays composed of early-stage LUADs (n=228). A total of 192 differentially expressed proteins were identified between tumor tissues of LR and HR and three clusters were identified via hierarchical clustering excluding eight proteins. Cluster 1 (65 proteins) showed a sequential decrease in expression from normal tissues to tumor tissues of LR and then to HR and was predominantly enriched in pathways such as tyrosine metabolism and ECM-receptor interaction, and increased matched mRNA expression of 18 proteins from this cluster predicted favorable prognosis. Cluster 2 (70 proteins) demonstrated a sequential increase in expression from normal tissues to tumor tissues of LR and then to HR and was mainly enriched in pathways such as extracellular organization, DNA replication and cell cycle, and high matched mRNA expression of 25 proteins indicated poor prognosis. Cluster 3 (49 proteins) showed high expression only in LR, with high matched mRNA expression of 20 proteins in this cluster indicating favorable prognosis. Furthermore, high expression of ERO1A and FEN1 at protein level predicted poor prognosis in early-stage LUAD, supporting the mRNA results. In conclusion, we discovered key differentially expressed proteins and pathways between low-risk and high-risk subtypes of early-stage LUAD. Some of these proteins could serve as potential biomarkers in prognostic evaluation.




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A proteomic approach to understand the clinical significance of acute myeloid leukemia-derived extracellular vesicles reflecting essential characteristics of leukemia [Research]

Extracellular vesicle (EV) proteins from acute myeloid leukemia (AML) cell lines were analyzed using mass spectrometry. The analyses identified 2450 proteins, including 461 differentially expressed proteins (290 upregulated and 171 downregulated). CD53 and CD47 were upregulated and were selected as candidate biomarkers. The association between survival of patients with AML and the expression levels of CD53 and CD47 at diagnosis was analyzed using mRNA expression data from The Cancer Genome Atlas database. Patients with higher expression levels showed significantly inferior survival than those with lower expression levels. Enzyme-linked immunosorbent assay results of the expression levels of CD53 and CD47 from EVs in the bone marrow of patients with AML at diagnosis and at the time of complete remission with induction chemotherapy revealed that patients with downregulated CD53 and CD47 expression appeared to relapse less frequently. Network model analysis of EV proteins revealed several upregulated kinases, including LYN, CSNK2A1, SYK, CSK, and PTK2B. The potential cytotoxicity of several clinically applicable drugs that inhibit these kinases was tested in AML cell lines. The drugs lowered the viability of AML cells. The collective data suggest that AML-derived EVs could reflect essential leukemia biology.




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A proteomics-based assessment of inflammation signatures in endotoxemia [Research]

We have previously shown that multimers of plasma pentraxin-3 (PTX3) were predictive of survival in patients with sepsis. To characterize the release kinetics and cellular source of plasma protein changes in sepsis, serial samples were obtained from healthy volunteers (n=10, 3 time-points) injected with low-dose endotoxin (LPS) and analyzed using data-independent acquisition (DIA) MS. The human plasma proteome response was compared to an LPS-induced endotoxemia model in mice. Proteomic analysis of human plasma revealed a rapid neutrophil degranulation signature, followed by a rise in acute phase proteins. Changes in circulating PTX3 correlated with increases in neutrophil-derived proteins following LPS injection. Time course analysis of the plasma proteome in mice showed a time-dependent increase in multimeric PTX3, alongside increases in neutrophil-derived myeloperoxidase (MPO) upon LPS treatment. The mechanisms of oxidation-induced multimerisation of PTX3 were explored in two genetic mouse models: MPO global knock-out mice and LysM CreNox2KO mice, in which NADPH oxidase 2 (Nox2) is only deficient in myeloid cells. Nox2 is the enzyme responsible for the oxidative burst in neutrophils. Increases in plasma multimeric PTX3 were not significantly different between wildtype and MPO or LysM CreNox2KO knock-out mice. Thus, PTX3 may already be stored and released in a multimeric form. Through in vivo neutrophil depletion and multiplexed vascular proteomics, PTX3 multimer deposition within the aorta was confirmed to be neutrophil-dependent. Proteomic analysis of aortas from LPS-injected mice returned PTX3 as the most upregulated protein, where multimeric PTX3 was deposited as early as 2 h post-LPS along with other neutrophil-derived proteins. In conclusion, the rise in multimeric PTX3 upon LPS injection correlates with neutrophil-related protein changes in plasma and in aortas. MPO and myeloid Nox2 are not required for the multimerisation of PTX3; instead, neutrophil extravasation is responsible for the LPS-induced deposition of multimeric PTX3 in the aorta.




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A potential role for the Gsdf-eEF1{alpha} complex in inhibiting germ cell proliferation: A protein-interaction analysis in medaka (Oryzias latipes) from a proteomics perspective [Research]

Gonadal soma-derived factor (gsdf) has been demonstrated to be essential for testicular differentiation in medaka (Oryzias latipes). To understand the protein dynamics of Gsdf in spermatogenesis regulation, we used a His-tag "pull-down" assay coupled with shotgun LC-MS/MS to identify a group of potential interacting partners for Gsdf, which included cytoplasmic dynein light chain 2, eukaryotic polypeptide elongation factor 1 alpha (eEF1α), and actin filaments in mature medaka testis. As for the interaction with TGFβ-dynein being critical for spermatogonial division in Drosophila melanogaster, the physical interactions of Gsdf-dynein and Gsdf-eEF1α were identified through a yeast 2-hybrid (Y2H) screening of an adult testis cDNA library using Gsdf as bait, which were verified by a paired Y2H assay. Co-immunoprecipitation of Gsdf and eEF1α was defined in adult testes as supporting the requirement of a Gsdf and eEF1α interaction in testis development. Proteomics analysis (data are available via ProteomeXchange with identifier PXD022153) and ultrastrutural observations showed that Gsdf deficiency activated eEF1α-mediated protein synthesis and ribosomal biogenesis, which in turn led to the differentiation of undifferentiated germ cells. Thus, our results provide a framework and new insight into the coordination of a Gsdf (TGFβ and eEF1α complex in the basic processes of germ cell proliferation, transcriptional and translational control of sexual RNA which may be fundamentally conserved across phyla during sexual differentiation.




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In depth characterization of the Staphylococcus aureus phosphoproteome reveals new targets of Stk1 [Research]

Staphylococcus aureus is a major cause of infections worldwide and infection results in a variety of diseases. As of no surprise, protein phosphorylation is an important game player in signaling cascades and has been shown to be involved in S. aureus virulence. Albeit long neglected, eukaryotic-type serine/threonine kinases in S. aureus have been implicated in this complex signaling cascades. Due to the sub-stoichiometric nature of protein phosphorylation and a lack of suitable analysis tools, the knowledge of these cascades is however, to date, still limited.

Here, were apply an optimized protocol for efficient phosphopeptide enrichment via Fe3+-IMAC followed by LC-MS/MS to get a better understanding of the impact of protein phosphorylation on the complex signaling networks involved in pathogenicity. By profiling a serine/threonine kinase and phosphatase mutant from a methicillin-resistant S. aureus mutant library, we generated the most comprehensive phosphoproteome dataset of S. aureus to date, aiding a better understanding of signaling in bacteria. With the identification of 3800 class I p-sites we were able to increase the number of identifications by more than 21 times compared to recent literature. In addition, we were able to identify 74 downstream targets of the only reported eukaryotic-type Ser/Thr kinase of the S. aureus strain USA300, Stk1. This work allowed an extensive analysis of the bacterial phosphoproteome and indicates that Ser/Thr kinase signaling is far more abundant than previously anticipated in S. aureus.




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Plasma proteomic data can contain personally identifiable, sensitive information and incidental findings [Research]

The goal of clinical proteomics is to identify, quantify, and characterize proteins in body fluids or tissue to assist diagnosis, prognosis, and treatment of patients. In this way, it is similar to more mature omics technologies, such as genomics, that are increasingly applied in biomedicine. We argue that, similar to those fields, proteomics also faces ethical issues related to the kinds of information that is inherently obtained through sample measurement, although their acquisition was not the primary purpose. Specifically, we demonstrate the potential to identify individuals both by their characteristic, individual-specific protein levels and by variant peptides reporting on coding single nucleotide polymorphisms. Furthermore, it is in the nature of blood plasma proteomics profiling that it broadly reports on the health status of an individual – beyond the disease under investigation. Finally, we show that private and potentially sensitive information, such as ethnicity and pregnancy status, can increasingly be derived from proteomics data. Although this is potentially valuable not only to the individual, but also for biomedical research, it raises ethical questions similar to the incidental findings obtained through other omics technologies. We here introduce the necessity of - and argue for the desirability for - ethical and human rights-related issues to be discussed within the proteomics community. Those thoughts are more fully developed in our accompanying manuscript. Appreciation and discussion of ethical aspects of proteomic research will allow for deeper, better-informed, more diverse, and, most importantly, wiser guidelines for clinical proteomics.




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Identification of novel serological autoantibodies in Takayasu arteritis patients using HuProt arrays [Research]

To identify novel autoantibodies of Takayasu arteritis (TAK) using HuProt array-based approach. A two-phase approach was adopted. In Phase I, serum samples collected from 40 TAK patients, 15 autoimmune disease patients, and 20 healthy subjects were screened to identify TAK-specific autoantibodies using human protein (HuProt) arrays. In Phase II, the identified candidate autoantibodies were validated with TAK-focused arrays using an additional cohort comprised of 109 TAK patients, 110 autoimmune disease patients, and 96 healthy subjects. Subsequently, the TAK-specific autoantibodies validated in Phase II were further confirmed using Western blot analysis. We identified and validated eight autoantibodies as potential TAK-specific diagnostic biomarkers, including anti-SPATA7, -QDPR, -SLC25A2, -PRH2, -DIXDC1, -IL17RB, -ZFAND4, and -NOLC1 antibodies, with AUC of 0.803, 0.801, 0.780, 0.696, 0.695, 0.678, 0.635 and 0.613, respectively. SPATA7 could distinguish TAK from healthy and disease controls with 73.4% sensitivity at 85.4% specificity, while QDPR showed 71.6% sensitivity at 86.4% specificity. SLC25A22 showed the highest sensitivity of 80.7%, but at lower specificity of 67.0%. In addition, PRH2, IL17RB and NOLC1 showed good specificities of 88.3%, 85.9% and 86.9%, respectively, but at lower sensitivities (<50%). Finally, DIXDC1 and ZFAND4 showed moderate performance as compared with the other autoantibodies. Using a decision tree model, we could reach a specificity of 94.2% with AUC of 0.843, a significantly improved performance as compared to that by each individual biomarker. The performance of three autoantibodies, namely anti-SPATA7, -QDPR and -PRH2, were successfully confirmed with Western blot analysis. Using this two-phase strategy, we identified and validated eight novel autoantibodies as TAK–specific biomarker candidates, three of which could be readily adopted in a clinical setting.




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Multi-sample mass spectrometry-based approach for discovering injury markers in chronic kidney disease [Research]

Urinary proteomics studies have primarily focused on identifying markers of chronic kidney disease (CKD) progression. Here, we aimed to determine urinary markers of CKD renal parenchymal injury through proteomics analysis in animal kidney tissues and cells and in the urine of patients with CKD. Label-free quantitative proteomics analysis based on liquid chromatography-tandem mass spectrometry was performed on urine samples obtained from 6 normal controls and 9, 11, and 10 patients with CKD stages 1, 3, and 5, respectively, and on kidney tissue samples from a rat CKD model by 5/6 nephrectomy. Tandem mass tag-based quantitative proteomics analysis was performed for primary cultured glomerular endothelial cells (GECs) and proximal tubular epithelial cells (PTECs) before and after inducing 24-h hypoxia injury. Upon hierarchical clustering, out of 858 differentially expressed proteins (DEPs) in the urine of CKD patients, the levels of 416 decreased and 403 increased sequentially according to the disease stage, respectively. Among 2965 DEPs across 5/6 nephrectomized and sham-operated rat kidney tissues, 86 DEPs showed same expression patterns in the urine and kidney tissue. After cross-validation with two external animal proteome datasets, 38 DEPs were organized; only 10 DEPs, including serotransferrin, gelsolin, poly ADP-ribose polymerase 1, neuroblast differentiation-associated protein AHNAK, microtubule-associated protein 4, galectin-1, protein S, thymosin beta-4, myristoylated alanine-rich C-kinase substrate, and vimentin were finalized by screening human GECs and PTECs data. Among these ten potential candidates for universal CKD marker, validation analyses for protein S and galectin-1 were conducted. Galectin-1 was observed to have a significant inverse correlation with renal function as well as higher expression in glomerulus with chronic injury than protein S. This constitutes the first multi-sample proteomics study for identifying key renal-expressed proteins associated with CKD progression. The discovered proteins represent potential markers of chronic renal cell and tissue damage and candidate contributors to CKD pathophysiology.




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Systematic identification of P. falciparum sporozoite membrane protein interactions reveals an essential role for the p24 complex in host infection [Research]

Sporozoites are a motile form of malaria-causing Plasmodium falciparum parasites that migrate from the site of transmission in the dermis through the bloodstream to invade hepatocytes. Sporozoites interact with many cells within the host, but the molecular identity of these interactions and their role in the pathology of malaria is poorly understood. Parasite proteins that are secreted and embedded within membranes are known to be important for these interactions, but our understanding of how they interact with each other to form functional complexes is largely unknown. Here, we compile a library of recombinant proteins representing the repertoire of cell surface and secreted proteins from the P. falciparum sporozoite and use an assay designed to detect extracellular interactions to systematically identify complexes. We identify three protein complexes including an interaction between two components of the p24 complex that is involved in the trafficking of glycosylphosphatidylinositol (GPI)-anchored proteins through the secretory pathway. Plasmodium parasites lacking either gene are strongly inhibited in the establishment of liver stage infections. These findings reveal an important role for the p24 complex in malaria pathogenesis and show that the library of recombinant proteins represents a valuable resource to investigate P. falciparum sporozoite biology.




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CMMB (Carboxylate Modified Magnetic Bead) -based isopropanol gradient peptide fractionation (CIF) enables rapid and robust off-line peptide mixture fractionation in bottom-up proteomics [Research]

Deep proteome coverage in bottom-up proteomics requires peptide-level fractionation to simplify the complex peptide mixture before analysis by tandem mass spectrometry. By decreasing the number of co-eluting precursor peptide ions, fractionation effectively reduces the complexity of the sample leading to higher sample coverage and reduced bias towards high abundance precursors that are preferentially identified in data-dependent acquisition strategies. To achieve this goal, we report a bead-based off-line peptide fractionation method termed CIF or Carboxylate modified magnetic bead-based isopropanol gradient peptide fractionation. CIF is an extension of the SP3 (single-pot solid-phase-enhanced sample preparation) strategy and provides an effective but complementary approach to other commonly used fractionation methods including strong cation exchange (SCX) and reversed phase (RP)-based chromatography. We demonstrate that CIF is an effective offline separation strategy capable of increasing the depth of peptide analyte coverage both when used alone or as a second dimension of peptide fractionation in conjunction with high pH RP. These features make it ideally suited for a wide range of proteomic applications including the affinity purification of low abundance bait proteins.




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The role of Data-Independent Acquisition for Glycoproteomics [Review]

Data independent acquisition (DIA) is now an emerging method in bottom-up proteomics and capable of achieving deep proteome coverage and accurate label-free quantification. However, for post-translational modifications (PTM), such as glycosylation, DIA methodology is still in the early stage of development. The full characterization of glycoproteins requires site specific glycan identification as well as subsequent quantification of glycan structures at each site. The tremendous complexity of glycosylation represents a significant analytical challenge in glycoproteomics. This review focuses on the development and perspectives of DIA methodology for N- and O- glycoproteomics and posits that DIA-based glycoproteomics could be a method of choice to address some of the challenging aspects of glycoproteomics. First, the current challenges in glycoproteomics and the basic principles of DIA is briefly introduced. DIA based glycoproteomics is then summarized and described into four aspects based on the actual samples. Lastly, we discussed the important challenges and future perspectives in the field. We believe that DIA can significantly facilitate glycoproteomic studies and contribute to the development of future advanced tools and approaches in the field of glycoproteomics.




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Unraveling the MAX2 Protein Network in Arabidopsis thaliana: Identification of the Protein Phosphatase PAPP5 as a Novel MAX2 Interactor [Research]

The F-box protein MORE AXILLARY GROWTH 2 (MAX2) is a central component in the signaling cascade of strigolactones (SLs) as well as of the smoke derived karrikins (KARs) and the so far unknown endogenous KAI2 ligand (KL). The two groups of molecules are involved in overlapping and unique developmental processes, and signal-specific outcomes are attributed to perception by the paralogous α/β-hydrolases DWARF14 (D14) for SL and KARRIKIN INSENSITIVE 2/ HYPOSENSITIVE TO LIGHT (KAI2/HTL) for KAR/KL. Additionally, depending on which receptor is activated, specific members of the SUPPRESSOR OF MAX2 1 (SMAX1) – LIKE (SMXL) family control KAR/KL and SL responses. As proteins that function in the same signal transduction pathway often occur in large protein complexes, we aimed at discovering new players of the MAX2, D14 and KAI2 protein network by tandem affinity purification using Arabidopsis cell cultures. When using MAX2 as a bait, various proteins were co-purified among which general components of the Skp1-Cullin-F-box complex and members of the CONSTITUTIVE PHOTOMORPHOGENIC 9 signalosome. Here, we report the identification of a novel interactor of MAX2, a type 5 serine/threonine protein phosphatase, designated PHYTOCHROME-ASSOCIATED PROTEIN PHOSPHATASE 5 (PAPP5). Quantitative affinity purification pointed at PAPP5 as being more present in KAI2 rather than D14 protein complexes. In agreement, mutant analysis suggests that PAPP5 modulates KAR/KL-dependent seed germination in suboptimal conditions and seedling development. Additionally, a phosphopeptide enrichment experiment revealed that PAPP5 might dephosphorylate MAX2 in vivo independently of the synthetic strigolactone analog, rac-GR24. Together, by analyzing the protein complexes to which MAX2, D14 and KAI2 belong, we revealed a new MAX2 interactor, PAPP5, that might act through dephosphorylation of MAX2 to control mainly KAR/KL- related phenotypes and, hence, provide another link with the light pathway.




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Interspecies differences in proteome turnover kinetics are correlated with lifespans and energetic demands [Research]

Cells continually degrade and replace damaged proteins. However, the high energetic demand of protein turnover generates reactive oxygen species (ROS) that compromise the long-term health of the proteome. Thus, the relationship between aging, protein turnover and energetic demand remains unclear. Here, we used a proteomic approach to measure rates of protein turnover within primary fibroblasts isolated from a number of species with diverse lifespans including the longest-lived mammal, the bowhead whale. We show that organismal lifespan is negatively correlated with turnover rates of highly abundant proteins. In comparison to mice, cells from long-lived naked mole rats have slower rates of protein turnover, lower levels of ATP production and reduced ROS levels. Despite having slower rates of protein turnover, naked mole rat cells tolerate protein misfolding stress more effectively than mouse cells. We suggest that in lieu of rapid constitutive turnover, long-lived species may have evolved more energetically efficient mechanisms for selective detection and clearance of damaged proteins.




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High-throughput and site-specific N-glycosylation analysis of human alpha-1-acid glycoprotein offers a great potential for new biomarker discovery [Research]

Alpha-1-acid glycoprotein (AGP) is an acute phase glycoprotein in blood, which is primarily synthetized in the liver and whose biological role is not completely understood. It consists of 45% carbohydrates that are present in the form of five N-linked complex glycans. AGP N-glycosylation was shown to be changed in many different diseases and some changes appear to be disease-specific, thus it has a great diagnostic and prognostic potential. However, AGP glycosylation was mainly analyzed in small cohorts and without detailed site-specific glycan information. Here, we developed a cost-effective method for a high-throughput and site-specific N-glycosylation LC-MS analysis of AGP which can be applied on large cohorts, aid in search for novel disease biomarkers and enable better understanding of AGP’s role and function in health and disease. The method does not require isolation of AGP with antibodies and affinity chromatography, but AGP is enriched by acid precipitation from 5 μl of bloodplasma in a 96 well format. After trypsinization, AGP glycopeptides are purified using a hydrophilic interaction chromatography based solid-phase extraction and analyzed by RP-LC-ESI-MS. We used our method to show for the first time that AGP N-glycan profile is stable in healthy individuals (14 individuals in 3 time points), which is a requirement for evaluation of its diagnostic potential. Furthermore, we tested our method on a population including individuals with registered hyperglycemia in critical illness (59 cases and 49 controls), which represents a significantly increased risk of developing type 2 diabetes. Individuals at higher risk of diabetes presented increased N-glycan branching on AGP’s second glycosylation site and lower sialylation of N-glycans on AGP’s third and AGP1’s fourth glycosylation site. Although this should be confirmed on a larger prospective cohort, it indicates that site-specific AGP N-glycan profile could help distinguish individuals who are at risk of type 2 diabetes.




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Ethical principles, opportunities and constraints in clinical proteomics [Research]

Recent advances in MS-based proteomics have vastly increased the quality and scope of biological information that can be derived from human samples. These advances have rendered current workflows increasingly applicable in biomedical and clinical contexts. As proteomics is poised to take an important role in the clinic, associated ethical responsibilities increase in tandem with the impact on the health, privacy, and well-being of individuals. Here we conducted and report a systematic literature review of ethical issues in clinical proteomics. We add our perspectives from a background of bioethics, the results of our accompanying paper extracting individual-sensitive results from patient samples, and the literature addressing similar issues in genomics. The spectrum of potential issues ranges from patient re-identification to incidental findings of clinical significance. The latter can be divided into actionable and unactionable findings. Some of these have the potential to be employed in discriminatory or privacy-infringing ways. However, incidental findings may also have great positive potential. A plasma proteome profile, for instance, could inform on the general health or disease status of an individual regardless of the narrow diagnostic question that prompted it. We suggest that early discussion of ethical issues in clinical proteomics is important to ensure that eventual regulations reflect the considered judgment of the community as well as to anticipate opportunities and problems that may arise as the technology matures further.




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Nuclear Disarmament and the Protection of Cultural Heritage

Nuclear Disarmament and the Protection of Cultural Heritage Research paper sysadmin 6 October 2017

States possessing nuclear weapons should be called upon to consider and publish the risks posed to cultural heritage, and their mitigation strategies, in their nuclear-weapons doctrines and policies.

A woman walks on the roof of the Great Mosque of Djenné, a World Heritage Site, after praying. Photo: United Nations.

Summary

  • Renewed risk assessments for nuclear weapons and policies are taking place around the world in light of nuclear modernization and the changing geostrategic environment that is making the use of nuclear weapons more likely. As such the humanitarian impacts of nuclear weapons and tests have received increased attention. However, the effect on cultural heritage has so far been neglected.
  • The potential for armed conflict to destroy cultural heritage has been recognized in international law since 1954. There is significant evidence on the impact of nuclear weapons on cultural heritage including the consequences of their use in Hiroshima and Nagasaki and the effect of nuclear-testing programmes in places of cultural significance since 1945. States that possess nuclear weapons have increased liabilities and responsibilities to protect cultural heritage and cultural rights. The need to protect cultural heritage should strengthen the case for reducing and eliminating nuclear weapons.
  • Failure to take into account the protection of heritage in the development of nuclear weapons policies – including disarmament, non-proliferation and arms-control negotiations – significantly undermines states’ existing commitments to protecting heritage threatened by conflict.
  • Risk assessments of the impact of nuclear weapons on cultural heritage and important cultural artefacts – and methods of preventing such catastrophic damage – should be part of protecting cultural heritage in every country and the subject of informed public debate. A new body of knowledge on the full range of nuclear weapons impacts would introduce a fresh perspective to inform decision-makers, international organizations and the public in thinking about nuclear weapons policies and practices.
  • Risk and resilience frameworks, which provide sets of solutions for risk assessments, would allow assessments of nuclear weapons threats to heritage and highlight vulnerabilities that need to be addressed. Such frameworks would provide a basis for policymakers to identify the world’s cultural heritage most at risk and help develop mitigation strategies to ensure that it is protected. In particular, states possessing nuclear weapons should be called upon to consider and publish the risks posed to cultural heritage, and their mitigation strategies, in their nuclear weapons doctrines and policies, as a contribution to transparency and confidence-building, and as a responsibility to the world’s shared heritage. International organizations, such as the UN Educational, Scientific, and Cultural Organization (UNESCO), have a role to play in bridging security perspectives with protecting cultural heritage.




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Gender-smart Procurement: Policies for Driving Change

Gender-smart Procurement: Policies for Driving Change Research paper sysadmin 14 December 2017

Governments should use public procurement policy as a strategic lever to accelerate gender-inclusive economic growth through the application of state spending power.

Entrepreneurs Virginia Santy and Melanie Ulle at Women in Kind, a co-working space aimed at small businesses run by women in Denver, US. Photo: Getty Images.

  • Governments need to rethink public procurement policy. They need to use it as a strategic lever to accelerate gender-inclusive economic growth through the application of state spending power, while maintaining rigorous governance standards. Reform of public procurement to make it more gender-inclusive could create a ‘diversity dividend’ through increased job creation and economic growth. Gender-smart procurement policies could also mitigate economic and business risk by rendering supply chains more diverse.
  • In 2014, G20 members agreed to reduce the gender gap in the labour market by 25 per cent by 2025. Procurement policy is one of the most powerful tools governments have to achieve this goal. All G20 members, regardless of the differences in their legal frameworks, can implement measures that will increase the ability of women to benefit from procurement policy.
  • Public procurement accounts for around one-fifth of global gross domestic product (GDP). It is estimated that women entrepreneurs supply only 1 per cent of this market. Women’s businesses face considerable barriers to accessing procurement tenders and winning procurement contracts. The inadequate design of many procurement processes prevents more inclusive gender outcomes for citizens. Governments should redefine procurement policies to make explicit the requirement that increasing women’s workforce participation, through greater use of female suppliers, is a key objective when selecting bids for procurement contracts.
  • Through the use of policy and spending levers, governments can play four primary roles in encouraging procurement from enterprises owned by women, or from businesses committed to promoting female labour participation. These roles are:
    - To direct reforms of government procurement – reviewing procurement policies and practices to ensure sustainable and inclusive procurement;
    - To reduce barriers to women’s participation in the economy – creating the support mechanisms to ensure an environment in which businesses owned by women can flourish;
    - To help scale up gender-smart procurement in the private sector – expanding government’s role in encouraging private companies to spend more of their procurement budgets with women’s businesses; and
    - To encourage increased transparency on the issues – creating and sharing procurement databases and lessons learned, especially at the regional level.
  • Companies can also benefit from having more diverse supply chains and volunteering for accreditation schemes. They can start conversations with government about national regulation that encourages diversity in procurement, leading by example.
  • The G20 should set measurable and time-bound targets in the area of gender-smart procurement, to build on the momentum of UN reforms and incorporate good practice in supply chain management.




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Prices, Products and Priorities: Meeting Refugees’ Energy Needs in Burkina Faso and Kenya

Prices, Products and Priorities: Meeting Refugees’ Energy Needs in Burkina Faso and Kenya Other resource sysadmin 24 January 2018

As the number of displaced people increases, and aid budgets come under further pressure, the imperative to identify cost-effective and sustainable solutions for delivering energy to refugees is more pressing than ever.

Father and daughter in their shelter in Goudoubo refugee camp, Burkina Faso, March 2017. Photo: Kwesi Annim.

This paper examines the issue of energy and displacement in detail, using insights from refugees in camps in Burkina Faso and Kenya. It seeks to promote a better understanding of their energy needs, priorities and preferences, and explores how increased access to energy might help to achieve lasting impact in the two camps surveyed. The paper is based on primary research from the Goudoubo camp in Burkina Faso and the Kakuma I camp in Kenya, but the analysis and conclusions are pertinent in the wider context of camps for forcibly displaced people.

  • There is a low level of energy access in the refugee camps of Kakuma I and Goudoubo, which contributes to poverty and hampers relief and development efforts. Trying to meet basic cooking, lighting and phone-charging needs is costly for refugees, consuming a significant share of stretched monthly budgets.
  • The predominant cooking solution consists of basic improved cookstoves burning wood and charcoal. The ‘three-stone fire’ method also remains commonplace. Three out of five families in Kakuma I report health problems due to smoke from cookstoves.
  • Street lighting is a high priority for residents, due to concerns about security and safety in camps. In Goudoubo, 86 per cent of survey respondents said that more household members would go out after dark if there were better public lighting.
  • A significant proportion of refugees would pay for cleaner and more efficient energy technologies, but many lack the financial resources required, and the development of markets for such products remains partially contingent on sustained financial support.
  • There is a need for a diversity of energy technologies that give varying levels and qualities of service; a ‘one size fits all’ approach is inappropriate if universal access to sustainable energy is to be achieved.
  • Clean cookstoves and fuels (LPG, ethanol, biogas, etc.) are in high demand, but require much greater investment if they are to be introduced at scale. Solid biomass and improved cookstoves will continue to be important cooking solutions in Kakuma I and Goudoubo, as well as in other refugee camps. A shift to more efficient cooking can be achieved at little or no extra cost for the significant proportion of people who still cook on three-stone fires.
  • Users of quality-verified household solar products spend dramatically less on light and power than do people using inferior technologies. Strong brand recognition and a high willingness to pay indicate a large market and a significant opportunity for the solar private sector.
  • Centralized electricity supply solutions – mini-grids or grid connections – are more economic than multiple standalone diesel generators. The current piecemeal and ad hoc approach, with each facility managing its own power supply, is inherently wasteful. Greater coordination among humanitarian clusters is required so that centralized solutions can be assessed, designed, financed and implemented.
  • Collecting data on energy expenditure and use, as well as quantification of the wide ranging impacts of improved technologies, is necessary to build a compelling case for investment in electricity infrastructure. In addition, engaging refugees on their needs, preferences and willingness to pay can improve the sustainability and impact of energy interventions.
  • Private-sector and market development approaches offer long-term, cost-effective solutions for refugees and can also benefit host communities. As the number of displaced people in the world increases, and as aid budgets come under further pressure, the imperative to identify cost-effective and sustainable solutions is more pressing than ever.

Chatham House is a part of the Moving Energy Initiative, a consortium working towards clean energy for refugees. For more information visit movingenergy.earth




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Drones and the European Union: Prospects for a Common Future

Drones and the European Union: Prospects for a Common Future Research paper sysadmin 30 January 2018

The debate over the use of drones is an opportunity for states to identify elements of military practice that their publics find uncomfortable or troubling, and to explain these areas of military operations in context.

A Heron drone on the runway at the Castor military camp in Gao, Mali, on 19 May 2017. Photo: Getty Images.

Summary

  • The debate over the use of drones is an opportunity for states to identify elements of military practice that their publics find uncomfortable or troubling, and to explain these areas of military operations in context.
  • Countries would benefit from working together to identify accountability gaps arising from fundamental elements of military cooperation, including the role of intelligence transfers in joint operations, and the distribution of responsibility for lethal actions in the context of coalition operations.
  • Transparency in investigation procedures, as well as devoting sufficient resources towards ensuring that mistakes are identified, will improve the perception of drone use among domestic audiences.
  • Identifying and communicating common standards and practices of mitigating complicity should be a priority for countries to ensure that they do not unwittingly become complicit in unlawful lethal operations.
  • Although operational safety may hinder the ability of states to be completely transparent, understanding among the general public could be improved through the communication of policies and procedures regarding non-lethal assistance to partner states conducting lethal operations, both inside and outside the context of an armed conflict.




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Libya’s War Economy: Predation, Profiteering and State Weakness

Libya’s War Economy: Predation, Profiteering and State Weakness Research paper sysadmin 9 April 2018

As Libya’s war economy persists, prospects for the restoration of functioning central governance become more distant.

Summary

  • Libya suffers from interlinked political, security and economic crises that are weakening state institutions, damaging its economy and facilitating the continued existence of non-state armed groups. As rival authorities continue to compete for power, the resulting fragmentation and dysfunction have provided a fertile environment for the development of a pervasive war economy dependent on violence.
  • This war economy is dynamic and constantly in flux. Relative to earlier problems, there were signs of progress on several fronts in 2017: a reduction in human smuggling, a tripling in oil revenues, and increased local action against fuel smuggling. Yet the dynamics that have supported the war economy’s rise remain.
  • Libya’s war economy is highly damaging for the future of the state for three reasons:
    • First, it provides an enabling environment for networks of armed groups, criminal networks, corrupt businessmen and political elites to sustain their activities through illicit sales and predatory practices. Their operations are closely linked to the dispensation of violence, and are thus a spur for further conflict.
    • Second, the war economy perpetuates negative incentives for those who profit from the state’s dysfunction. Only effective governance, supported by a durable political settlement, can tackle the foundations of Libya’s war economy. But neither a return to functioning central governance nor the development of a security sector that is fit for purpose is in the interests of war economy profiteers, who are therefore motivated to act as powerful spoilers of reform.
    • Third, the political contestation and resource predation practised by those engaged in the war economy are having a disastrous impact on Libya’s formal economy, undermining what remains of its institutions. As the war economy persists, therefore, the prospects for the restoration of functioning central governance become more distant. This threatens to create a vicious cycle that accelerates further state collapse.
  • Due to the limited capacity for coercion available to any actor or entity connected with the state, a strategy of co-opting networks of war economy profiteers has almost exclusively prevailed. This has failed. Drawing on the lessons from these attempts, a more successful policy must pursue targeted measures to combat the enabling structures of Libya’s war economy where possible, and to co-opt war economy profiteers only where necessary.
  • In this, state authorities can do more to utilize what power they have to name and shame war economy profiteers in order to weaken the local legitimacy critical to profiteers’ survival. The state must present credible alternative livelihood opportunities to those engaged in, or benefiting from, the war economy. Progress will depend in part on the creation of positive incentives to abandon such activity. Where profiteers cannot be incentivized to move towards more legitimate economic activities, greater and more effective efforts must be made to reduce the profit margins of illicit schemes.
  • The international community can do more to support Libyan efforts in countering the war economy. Cooperation over the targeting of criminal groups’ overseas assets, support for increased transparency over the dispensation of state funds, and measures to reduce the viability of illicit activities can all help to strengthen the position of state authorities.

Further reading

Discover the six things you need to know about Libya’s war economy




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Tackling Illegal Wildlife Trade in Africa: Economic Incentives and Approaches

Tackling Illegal Wildlife Trade in Africa: Economic Incentives and Approaches Research paper sysadmin 5 October 2018

Combating illegal wildlife trade and further pursuing conservation-development models could help generate considerable economic benefits for African countries, while ensuring the long-term preservation of Africa’s wealth of natural capital.

Field scout recording desert black rhino data, Save the Rhino Trust, Palmwag, Torra Conservancy, Damaraland, Namibia. Photo: Mint Images/Frans Lanting/Getty Images.

Summary

  • The illegal wildlife trade (IWT) significantly impacts African economies by destroying and corroding natural, human and social capital stocks. This hinders the achievement of the Sustainable Development Goals (SDGs) and has an impact on national budgets. Illicit financial flows from IWT deny revenue to governments where legal wildlife product trade exists and perpetuate cash externalization. IWT diverts national budgets away from social or development programmes, increases insecurity and threatens vulnerable populations.
  • In expanding wildlife economies and pursuing conservation-driven development models, governments can protect their citizens, derive revenue from wildlife products, and establish world class tourism offerings. The illegal exploitation of wildlife is often due to a failure to enforce rights over those resources, where rights are unclearly defined or not fully exercised. Southern African countries have defined these rights in various ways, contributing to regional differences in conservation practices and the socio-economic benefits derived from wildlife resources. Combating IWT is an important step towards allowing legitimate business and communities to develop livelihoods that incentivize stewardship and connect people to conservation.
  • The Southern African Development Community (SADC) has several framework policies for the establishment of transfrontier conservation areas (TFCAs). These promote local stewardship across multiple land-use areas to conserve biodiversity and increase the welfare and socioeconomic development of rural communities. Private-sector partnerships also increase skills transfer, improve access to investment finance, and expand economic opportunities, including through the promotion of local procurement. The economic benefits of TFCAs extend beyond tourism.
  • The economic value of African ecosystems is often under-recognized because they remain unquantified, partly due to the lack of available data on the broader economic costs of IWT. Improved monitoring and evaluation with key performance indicators would help governments and citizens to appreciate the economic value of combating IWT.




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The Role of Sub-state and Non-state Actors in International Climate Processes: Civil Society

The Role of Sub-state and Non-state Actors in International Climate Processes: Civil Society Research paper sysadmin 27 November 2018

Given today’s challenging geopolitical conditions and the evolving nature of the international climate regime since Paris, civil society must now once again recalibrate its strategies to ensure continued and increasing relevance.

Photo by The Climate Reality Project, ‘People’s Climate March Protest’, via Unsplash, 2017.

This is one of four background papers feeding into a synthesis paper entitled The Role of Sub-state and Non-state Actors in International Climate Processes.

Summary

  • Following the failure of the 15th Conference of the Parties (COP 15) in Copenhagen in 2009, there was a step change in the sophistication and unity of civil society engagement on climate policy. This ensured that, subsequently, civil society was more effective in exercising multiple channels of influence around the negotiations for the Paris Agreement in 2015.
  • Civil society proved to be particularly effective at harnessing the twin narratives of climate science and economics, and at leveraging an emerging multi-level governance architecture, to create political space for climate leadership.
  • Given today’s challenging geopolitical conditions and the evolving nature of the international climate regime since Paris, civil society must now once again recalibrate its strategies to ensure continued and increasing relevance.
  • In particular, the shift to a more ‘nationally grounded’ implementation regime focusing on individual states’ climate commitments will require civil society to become more effective at influencing domestic politics. At the same time, civil society will need to continue to seek strategic synergies at the international level.
  • Civil society has a central role to play in ensuring that the first key test of the Paris ‘ratchet’ mechanism – revising countries’ pledged climate actions, or Nationally Determined Contributions (NDCs), by 2020 – is robust, science-informed and strongly rooted in domestic politics.




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The Role of Sub-state and Non-state Actors in International Climate Processes: Corporate Sector

The Role of Sub-state and Non-state Actors in International Climate Processes: Corporate Sector Research paper sysadmin 27 November 2018

Given the challenging political contexts since 2015, the corporate sector will have a key role to play in persuading national governments how technologies and expertise have moved on since the pledges were made.

Photo by Priscilla Du Preez, ‘Climate Reality’ via Unsplash, 2017.

This is one of four background papers feeding into a synthesis paper entitled The Role of Sub-state and Non-state Actors in International Climate Processes.

Summary

  • The corporate sector has traditionally engaged governments at national rather than international level in lobbying for action related to climate change. Where it has engaged at an international level, this has often been to restrain regulation and ambition, such as in air transport. Over time, many businesses have increasingly understood that there is more commercial opportunity in a strong, consistent approach to tackling climate mitigation and adaptation, and an increasing number are willing to speak up on the issue. The Paris Climate Conference in 2015 demonstrated this positive engagement.
  • Businesses are more powerful when engaging directly with national governments on detailed policies – by demonstrating what is possible and indirectly influencing national governments’ international pledges. Traditional trade/industry sector associations and groups have tended to suffer from the ‘lowest common denominator’ effect of their least progressive members. Progressive business groups coalescing around climate ambition can help to counter this.
  • Unlike at the Copenhagen climate talks in 2009, the business community provided a positive, supportive backdrop to the 2015 Paris talks, mindful of the public relations opportunities in taking a progressive stance and of the benefits of targets that reflected the science. The carbon market was a particular focus for corporates, which succeeded in getting emissions trading options and market mechanisms included in Article 6 of the Paris Agreement.
  • Given the challenging political contexts since 2015, the corporate sector will have a key role to play in persuading national governments how technologies and expertise have moved on since the pledges were made. With increasing awareness of resource scarcity, businesses are pursuing ever more creative solutions.
  • Wide recognition that the avoidance of future emissions is increasingly dependent on developing and emerging economies means that business voices from these countries will potentially be more influential in the next few years.




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The Role of Sub-state and Non-state Actors in International Climate Processes

The Role of Sub-state and Non-state Actors in International Climate Processes Research paper sysadmin 27 November 2018

In the current international political environment of rising populism, the role of sub- and non-state actors may become more important than ever.

Photo by UNclimatechange, ‘Bonn Climate Change Conference - October 2014’ via Flickr, 2014.

Summary

  • Climate action from sub-state and non-state actors such as subnational governments, cities, corporations and NGOs has very significant potential to enhance national efforts to curb CO2 emissions, close the so-called ‘emissions gap’ – between current commitments and the action necessary to meet climate targets – and help move the world on to a ‘1.5°C pathway’ that would limit global warming to 1.5°C above pre-industrial levels by 2100.
  • In addition to their own climate action, sub-state/non-state actors can contribute to climate governance by developing new policies and business models to support emissions cuts and build resilience. Knowledge exchange and capacity-building have a role to play in helping these innovations to spread internationally.
  • Politically, measures implemented by sub-state/non-state actors can help national governments to implement existing targets faster and more effectively, while helping to build political support for more ambitious climate action.
  • The post-Paris climate regime of the United Nations Framework Convention on Climate Change (UNFCCC) reflects the growing importance of sub- and non-state actors, and has featured the creation of institutional structures to engage and coordinate them.
  • In the current international political environment of rising populism, the role of sub- and non-state actors may become more important than ever. However, more questions about the robustness of sub- and non-state action are also likely to be raised.
  • With the 2020 deadline approaching for countries to submit details of enhanced Nationally Determined Contributions (NDCs), long-term climate strategies and other means of raising policy ambition, the next two years are set to provide significant opportunity for sub- and non-state action. Many governments are already developing ways to engage with sub- and non-state actors to identify opportunities to strengthen action by 2020.
  • Key questions in this respect include (a) whether sub- and non-state actors can mobilize across sectors; and (b) whether action can be extended beyond the ‘usual suspects’ to include contributions from less familiar sources, such as business sectors with limited opportunities for climate action or corporations in the Global South.




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Proportionality in the Conduct of Hostilities: The Incidental Harm Side of the Assessment

Proportionality in the Conduct of Hostilities: The Incidental Harm Side of the Assessment Research paper sysadmin 6 December 2018

Clarification of international humanitarian law is important in ensuring compliance with the rule of proportionality, but a culture of compliance within armed forces and groups is also crucial.

Members of civil right defence conduct a search and rescue operation on destroyed buildings after an airstrike was carried out over the city of Jisr al-Shughur in Idlib province in Syria, on 6 May 2018. Photo: Hadi Harrat/Anadolu Agency/Getty Images.

Summary

  • Military operations are taking place with increasing frequency in densely populated areas. Such operations result in loss of life and harm to civilians, as well as damage to civilian objects, (including infrastructure providing essential services). In order to protect civilians, it is imperative that armed forces and groups comply with the rules of international humanitarian law on the conduct of hostilities, including the rule of proportionality.
  • The rule of proportionality prohibits attacks which may be expected to cause incidental loss of civilian life, injury to civilians, damage to civilian objects or a combination thereof, which would be excessive in relation to the concrete and direct military advantage anticipated. This research paper analyses the key steps that belligerents must take to give effect to the rule, with a particular focus on one side of proportionality assessments – the expected incidental harm.
  • Those undertaking proportionality assessments before or during an attack must consider whether the expected harm will be caused by the attack, and whether that harm could be expected (that is, was it reasonably foreseeable).
  • For the purpose of proportionality assessments, injury to civilians includes disease, and there is no reason in principle to exclude mental harm, even though it is currently challenging to identify and quantify it. Damage to civilian objects includes damage to elements of the natural environment.
  • Once the incidental harm to be considered has been identified, a value or weight must be assigned to it. This is then balanced against the value or weight of the military advantage anticipated from the attack to determine whether the harm would be excessive.
  • In the determination of whether the expected incidental harm would be excessive compared to the anticipated military advantage, ‘excessive’ is a wide but not indeterminate standard.
  • Belligerents should develop methodologies so that those planning and deciding attacks are provided with all necessary information on expected incidental harm, and to assist them in assigning weight to the incidental harm to be considered.
  • If it becomes apparent that the rule of proportionality will be contravened, the attack in question must be cancelled or suspended.
  • Clarification of the law is important in ensuring compliance with the rule of proportionality, but a culture of compliance within armed forces and groups, inculcated by their leaders, is also crucial.




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The Role of Sub-state and Non-state Actors in International Climate Processes: Financial Institutions

The Role of Sub-state and Non-state Actors in International Climate Processes: Financial Institutions Research paper sysadmin 20 December 2018

The trillions of dollars needed to secure the sustainable, climate-compatible pathway outlined in the 2015 Paris Agreement have focused attention on private finance and investment.

Photo by João Barbosa, ‘The need to keep growing’, 2018.

This is one of four background papers feeding into a synthesis paper entitled The Role of Sub-state and Non-state Actors in International Climate Processes.

Summary

  • The trillions of dollars needed to secure the sustainable, climate-compatible pathway outlined in the 2015 Paris Agreement have focused attention on private finance and investment, and on the role of the financial sector as a potentially powerful non-state actor in the international climate debate.
  • Leading individual financial institutions reacted to the Paris Agreement by framing it in terms of what it would mean for markets – i.e. risks and opportunities – and by underlining the importance of national implementation of climate change commitments.
  • Key recent developments signal that the financial sector actively supports Paris-compatible government action on climate change, as well as company-level action to understand the physical and ‘transition’ risks and opportunities associated with climate change and policy responses. Financial sector engagement is taking place through well-organized and well-supported international initiatives and platforms. A critical part of this process entails robust activity by financial institutions to embed climate change and broader sustainability factors into strategies and operations.
  • At country level, attention to implementation of Nationally Determined Contributions (NDCs) and associated sector-level policy development has been largely separate from the broader ‘sustainable finance’ dynamic. National-level action has not benefited from the same level of organized financial sector involvement evident in international action. One of the reasons for this is that, with some notable exceptions, international financial initiatives lack the capacity and resources to participate in the granular detail of national policy processes. Policymakers in turn often lack the internal capacity to consult or engage with the financial sector domestically.
  • This paper includes some thoughts on further international and national climate actions. Ensuring that messages from successful international financial sector initiatives are heard in regional and non-climate forums offers one avenue for building a stronger foundation for greater climate ambition. Building the resource base for stronger national climate policy engagement, as a counter-voice to incumbent interests and to ensure that the quality of policy is ‘investment grade’, is another. This will be critical to the delivery of policy outcomes. Other key elements include the need to pool knowledge across relevant parts of the finance sector, build alliances, and shift action towards joint problem-solving with policymakers. A ‘Talanoa 2.020’-type initiative offers one potentially promising approach to advancing dialogue in this respect.




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Cooking in Displacement Settings: Engaging the Private Sector in Non-wood-based Fuel Supply

Cooking in Displacement Settings: Engaging the Private Sector in Non-wood-based Fuel Supply Research paper sysadmin 22 January 2019

In displacement settings, providing cooking solutions that reduce negative impacts on the environment and health remains a challenge for local governments, humanitarian agencies, businesses and refugees.

A user of LPG distributed through UNHCR’s SEED programme in the Diffa region of Niger. Photo: Louise Donovan, UNHCR Niger.

Summary

  • Providing adequate cooking fuel and clean-burning, fuel-efficient stoves in displacement settings has long been a major challenge for local authorities, humanitarian agencies, non-governmental organizations, local communities and refugees themselves. Refugees generally have limited access to modern cooking solutions. Most either depend on insufficient humanitarian agency handouts of ‘in-kind’ firewood or have to travel long distances to collect firewood.
  • There is significant potential for private-sector engagement in this context – which, though largely overlooked to date, could result in win-win scenarios for all stakeholders. Refugee camps and other displacement settings present opportunities for private-sector cooking fuel companies to expand their customer bases, with the added advantage for vendors of offering concentrated demand and scope for economies of scale.
  • For the Kakuma refugee camp complex in Kenya, the Moving Energy Initiative (MEI) decided to engage with the private sector directly. The MEI requested expressions of interest from local private-sector companies for expanding sales and distribution of fuels in the complex through the concession. The winning company – National Oil Corporation of Kenya – is to receive a prize of $50,000 for its proposed concession to supply liquefied petroleum gas both to refugees in the Kakuma complex and to the surrounding host community.
  • The MEI also conducted interviews with various stakeholders in other contexts and countries who are engaged in efforts to develop market-based approaches to providing clean, fuel-efficient cooking solutions to refugees.
  • Based on the interviews and the concession process, the MEI recommends greater donor investment and longer-term guaranteed funding for cooking interventions. This is needed to allow sufficient time to build sustainable markets and secure the requisite engagement and investments from the private sector.
  • Larger, longer-term investments by the private sector – supported through partnerships with donors and humanitarian agencies – in infrastructure and demand creation (both in and outside the refugee community) can reduce the price of alternative solutions and support a gradual transition away from subsidies.




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The Role of Sub-state and Non-state Actors in International Climate Processes: Subnational Governments

The Role of Sub-state and Non-state Actors in International Climate Processes: Subnational Governments Research paper sysadmin 23 January 2019

This paper looks at the role of subnational governments in influencing global climate ambition, and makes recommendations for how these actors can increase their influence in the future.

Photo by Annie Spratt, ‘High in the SuperTrees’ via Unsplash, 2017

Summary

  • ‘Subnational governments’ – including municipal, regional and provincial authorities – lack the formal status of negotiating parties to the United Nations Framework Convention on Climate Change (UNFCCC). But they have a vital role to play in informing and helping to shape international climate action, as they are often the key delivery partners for on-the-ground policies.
  • Subnational governments are often closer to climate problems than the UNFCCC parties themselves, and have experience, expertise and peer influence that can support the development of progressive policies and increased ambition.
  • Many subnational governments have joined or formed various groupings to share information and experience, and to increase their collective profile and voice. Notable initiatives and collaborations include the Under2 Coalition, ICLEI, C40 and the Global Covenant of Mayors for Climate & Energy.
  • Subnational governments are highly diverse. In some cases, politically high-profile administrations – the US state of California being a notable example – have exploited their visibility and policy successes to engage in wider climate debates. Equally, however, subnational agendas can encounter resistance from national governments anxious to ensure the primacy of their negotiating positions in the UNFCCC system.
  • One of the advantages that subnational governments enjoy, subject to resources, is their ability to join with peer groups to take a fresh approach to mitigation or adaptation policies. Groups of cities or subnational regions can, through collaborative organizations, explore new approaches that might be less attractive within a national context.
  • To maintain and build on their current achievements and influence, subnational governments need, among other things, to: improve the credibility of their experience through evaluation of the success of their climate policies; use membership of appropriate international groups to share experience and boost their leverage; continue to create collaborative relationships with progressive businesses to increase influence at a national level; build on cross-regional relationships in climate adaptation and resilience; and work with other subnational actors to build momentum ahead of the first post-Paris revision of climate commitments in 2020.




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Healthy Diets from Sustainable Production: Indonesia

Healthy Diets from Sustainable Production: Indonesia Research paper sysadmin 24 January 2019

Indonesia has an uncommon chance to bypass the negative trajectory of diets in other emerging economies and build a healthy and sustainable food system.

Indonesian Muslims prepare foods for iftar at the Jogokariyan Mosque on 3 June 2017 in Yogyakarta, Indonesia. Photo: Sijori Images / Barcroft Images / Barcroft Media via Getty Images.

Summary

  • Indonesia is approaching a key point on its development pathway. Rapidly declining poverty, a growing and urbanizing middle class with increased purchasing power and consumption patterns, and a diminishing contribution of agriculture to overall GDP are all set to fundamentally reorient much in society.
  • Dietary change is at the heart of the public health and environmental challenges now facing Indonesia. Rates of obesity and diet-related non-communicable diseases such as type 2 diabetes are on the increase, while high levels of childhood undernutrition persist. This double burden of malnutrition presents a critical challenge for the future of Indonesian public health.
  • At the same time, shifts in diet are placing increased pressure on the environment, threatening biodiversity and species loss and rapidly increasing risks for land-use change, climate change and freshwater use. In Indonesia, these environmental impacts of agriculture are driven both by domestic consumption of food and biofuels, and by a focus on export-led agricultural growth – particularly palm oil, rubber, coffee and cocoa.
  • A core political focus on achieving national self-sufficiency in five strategic commodities – soy, rice, maize, sugar and beef – which has led to some price distortion, and the growing influence of modernized retail are potentially at odds with a transition to healthy diets from sustainable production.
  • The components to support an ambitious national food strategy already exist, but are either underutilized or misdirected. Indonesia’s national dietary guidelines and examples of successful food-based social services, together with the country’s potential to lead the sustainable production and consumption agenda, both regionally and internationally, and its commitments under both the UN Sustainable Development Goals and the Paris Agreement on climate change, can all be harnessed to foster improved diets.
  • There is a need to align high-level policy strategies across environment, public health and food issues. Mainstreaming the principles of a healthy diet within existing food policy and partnering with food providers and local pioneers to champion these efforts can help to ensure that healthy diets, produced sustainably, become the norm.
  • Between now and 2020, when Indonesia embarks on the final five-year tranche of its National Long-Term Development Plan, there is an important window of opportunity to take decisive action that will influence the future trajectory of the population’s health and that of its environment, as well as contribute substantively to the global fight against climate change and biodiversity loss.
  • 2019 will, meanwhile, be a critical election year in Indonesia, with both presidential and legislative elections due. Signals from Indonesian media and civil society organizations indicate that poverty reduction and social equity – including affordability of good food and healthcare – will be among the flagship issues for voters.
  • The moment is thus ripe for a bold new vision for a sustainable food system that supports healthy diets for all. In choosing to act now, Indonesia could lay the foundations for a more resilient and equitable development pathway that prioritizes improved public health while at the same time safeguarding some of the world’s most important ecosystems for future generations.




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Adopting a Market-based Approach to Boost Energy Access in Displaced Contexts

Adopting a Market-based Approach to Boost Energy Access in Displaced Contexts Research paper sysadmin 25 March 2019

This paper evaluates the market-based approaches adopted in the MEI projects in Kenya and Burkina Faso. It articulates how such commercial strategies can be applied to the delivery of energy in displacement settings and compares this to real world examples.

A shop selling fabric and electronics inside the Dagahaley Camp, one of five camps that make up Dadaab, the world’s largest and oldest camp for refugees. Photo: Michelle Shephard/Toronto Star via Getty Images.

  • Development of long-term energy solutions in displacement settings tends to be perceived as investment that falls outside the remit of emergency responses. In addition, when emergency energy supply measures are implemented they often result in expensive, unreliable and unhealthy energy provision for those in protracted or recurrent crises.
  • There is widespread agreement among humanitarian and development experts that an effective refugee response should include long-term development solutions as well as emergency relief.
  • The energy access imperative is more pronounced when considering the need for effective energy distribution in practically all camp activities and basic necessities: pumping and treatment of clean water; heating and cooling for food storage and cooking; energy for livelihood activities; and provision of light for schooling, hospitals and the prevention of violence against women and children.
  • Minor shifts in household energy use to basic solar lighting options and non-wood fuels would save $303 million annually on refugee fuel costs.
  • Within refugee contexts in Kenya and Burkina Faso, the MEI sought to examine opportunities to use market interventions, rather than in-kind distributions, to improve clean energy access over the long-term and test the delivery of market-based approaches.




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Infrastructure Management Contracts: Improving Energy Asset Management in Displacement Settings

Infrastructure Management Contracts: Improving Energy Asset Management in Displacement Settings Research paper sysadmin 17 April 2019

This paper highlights a number of options for managing electricity infrastructure in refugee camps and outlines the challenges, opportunities and operational implications associated with them. It takes the Kalobeyei settlement in Kenya as a case study.

A solar array installed for International Rescue Committee health clinics in Kakuma refugee camp, Kenya. Photo: Kube Energy

  • Building and maintaining electricity infrastructure to power offices, businesses, households and other operations in displacement settings is difficult. It is especially challenging for the Office of the United Nations High Commissioner for Refugees (UNHCR) and its partner agencies, because supplying electricity is not their core business.
  • Private-sector companies exist that are willing and able to develop infrastructure management contracts to provide energy as a service in displacement settings. However, institutional barriers within humanitarian agencies persist, with short budgeting cycles in particular preventing humanitarian agencies from entering into the sorts of long-term service agreements required by the private sector.
  • A number of options exist to leverage the expertise of the private sector through ‘public–private partnership’ (P3) structures. Such mechanisms can promote more efficient management of infrastructure by drawing on private-sector experience and expertise, incentivizing appropriate risk-sharing and providing options to leverage private capital in project development.
  • Field work from the Kalobeyei settlement in Kenya suggests that a solar/diesel hybrid mini-grid solution was the most economical option to power camp services and infrastructure there. Compared to distributed diesel generation, the annual savings in operating costs were estimated at $49,880, with the additional investment paid back within 3.6 years.
  • Humanitarian agencies need to be willing to change their policies to enable long-term service agreements. Alternatively (or, more likely, in conjunction with this option), financial mechanisms such as partial risk guarantees need to be developed to offset some of the risks. This change will need high-level support from donors and humanitarian agencies.
  • Once the first infrastructure management contracts can be signed and tested in displacement locations (through the use of donor funding or otherwise) and associated data collected, it will ease the way for future investments in these types of projects.




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The Chatham House Sustainable Laboratories Initiative: Prior Assessment Tool

The Chatham House Sustainable Laboratories Initiative: Prior Assessment Tool Other resource sysadmin 14 June 2019

Laboratories are critical for supporting effective infectious disease surveillance and outbreak response. This tool is meant to help structure a conversation between funding partners and recipient countries on how to most effectively establish or repurpose laboratories in low-resource environments.

Copyright: Getty Images/ER Productions Limited

Introduction

Laboratories are critical for supporting effective infectious disease surveillance and outbreak response, and lack of adequate laboratory capacity is a global challenge. As part of global health security initiatives, cooperative threat reduction efforts and international development programmes, sophisticated laboratories have been provided to mitigate biological threats and bolster a country’s capacity for detection, diagnosis and storage of high-consequence pathogens. Very often, these use the assumptions, standards and templates applied in high-income countries. However, it can be difficult or even impossible to sustain these facilities in low-resource environments. There can sometimes be limited local technical capacity and capability, which can result in a high reliance on imported expertise, skills, equipment and other resources. Sustainability can therefore be hard to achieve. In addition, when a funding partner withdraws, the laboratories can become disused, foundering without the trained personnel and financial resources to sustain them.

To help address this situation, a proposal gaining increasing support internationally is to adopt an approach based on a local risk assessment, whereby laboratories are appropriately and optimally tailored to the local risks and to the resources available, both in the short and longer term, without compromising biosafety and biosecurity.

A Chatham House workshop was convened in Abuja, Nigeria, in 2018 to explore what West African countries would find most appropriate in terms of building laboratory capacity, what the main challenges have been so far, and what needs to be done to improve the sustainability of laboratories in the region. It emerged that there was a need for a more structured conversation between the funding partner and recipient country early in the process – prior to embarking on the detailed planning phase for the establishment or repurposing of a laboratory. This should involve careful consideration and an assessment of existing and planned capacity, needs and contextual issues, together with proposals for how to address the issues revealed, so that any ensuing laboratory demonstrably supports the national strategy and therefore flourishes.

The purpose of this tool

This tool aims to provide a structure for such a conversation. Developed in close collaboration with international experts and West African stakeholders, it seeks to increase local ownership and help partners ensure they have given due attention to all the relevant aspects, including risks and benefits, that need to be considered at an early stage. It should provide clarity on what is needed and improve the sustainability of any laboratory project that might result from the discussions. The tool can be applied when a new laboratory is being considered, or when an existing laboratory is to be repurposed or strengthened. It is also appropriate for use with public health, veterinary and environmental laboratories. Although the tool was developed in the context of high-consequence pathogens in Africa, it is anticipated that it will find global application.

It should support recipient countries to take stock of their capacities and capabilities, identify gaps, conduct an analysis of their needs and to develop the business case that can assist in seeking the necessary political and financial support for the laboratory. Meanwhile, it should facilitate the process of due diligence for the funding partner and provide a better understanding of what the recipient country perspective and realities are, and what the scale and nature of any investment might be.




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Artificial Intelligence Prediction and Counterterrorism

Artificial Intelligence Prediction and Counterterrorism Research paper sysadmin 6 August 2019

The use of AI in counterterrorism is not inherently wrong, and this paper suggests some necessary conditions for legitimate use of AI as part of a predictive approach to counterterrorism on the part of liberal democratic states.

Surveillance cameras manufactured by Hangzhou Hikvision Digital Technology Co. at a testing station near the company’s headquarters in Hangzhou, China. Photo: Getty Images

Summary

  • The use of predictive artificial intelligence (AI) in countering terrorism is often assumed to have a deleterious effect on human rights, generating spectres of ‘pre-crime’ punishment and surveillance states. However, the well-regulated use of new capabilities may enhance states’ abilities to protect citizens’ right to life, while at the same time improving adherence to principles intended to protect other human rights, such as transparency, proportionality and freedom from unfair discrimination. The same regulatory framework could also contribute to safeguarding against broader misuse of related technologies.
  • Most states focus on preventing terrorist attacks, rather than reacting to them. As such, prediction is already central to effective counterterrorism. AI allows higher volumes of data to be analysed, and may perceive patterns in those data that would, for reasons of both volume and dimensionality, otherwise be beyond the capacity of human interpretation. The impact of this is that traditional methods of investigation that work outwards from known suspects may be supplemented by methods that analyse the activity of a broad section of an entire population to identify previously unknown threats.
  • Developments in AI have amplified the ability to conduct surveillance without being constrained by resources. Facial recognition technology, for instance, may enable the complete automation of surveillance using CCTV in public places in the near future.
  • The current way predictive AI capabilities are used presents a number of interrelated problems from both a human rights and a practical perspective. Where limitations and regulations do exist, they may have the effect of curtailing the utility of approaches that apply AI, while not necessarily safeguarding human rights to an adequate extent.
  • The infringement of privacy associated with the automated analysis of certain types of public data is not wrong in principle, but the analysis must be conducted within a robust legal and policy framework that places sensible limitations on interventions based on its results.
  • In future, broader access to less intrusive aspects of public data, direct regulation of how those data are used – including oversight of activities by private-sector actors – and the imposition of technical as well as regulatory safeguards may improve both operational performance and compliance with human rights legislation. It is important that any such measures proceed in a manner that is sensitive to the impact on other rights such as freedom of expression, and freedom of association and assembly.




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Belarusians’ views on the political crisis - April 2021

Belarusians’ views on the political crisis - April 2021 Other resource NCapeling 11 June 2021

Results of a public opinion poll conducted between 20 and 30 April 2021.

Chatham House surveyed a total of 937 respondents between 20 and 30 April 2021. Our survey sample corresponds to the general structure of Belarus’s urban population and is corrected and weighted by gender, age, size of respondents’ town of residence and education level.

Summary

  • After Lukashenka, the most known political figures in Belarus are pro-protest politicians: Tsikhanouskaya, Babaryka, Tsikhanouski, Kalesnikava, Tsapkala and Latushka. Viktar Babaryka is the most popular presidential candidate among Belarusian urban citizens, and Lukashenka comes second to him.
  • State organizations and bodies are still mistrusted by more than half the population, while the army is slightly more popular than other bodies. Independent media, labour unions and human rights organizations are trusted far more than state ones.
  • Russia leads when it comes to positive attitudes to foreign states: one in three Belarusians feel very positive about their neighbour and 79 per cent feel positive in general. 71 per cent Belarusians feel positive about China, which is the next highest indicator. Despite propaganda efforts, Ukraine, Lithuania, Poland and EU states in general are still perceived positively by more than 60 per cent of Belarusians, with fewer than 20 per cent feeling negative about them.
  • The position on Russian interference in the Belarusian political crisis is consolidated enough: 58 per cent think that Russia should remain neutral. The rest are almost equally divided between those who think Russia should support the protest movement (19 per cent) and those who think Russia should support Lukashenka (23 per cent).
  • 40 per cent have changed their attitude to the Russian government since it supported Lukashenka in the crisis, and 73 per cent are sure that Russia is his sole support.
  • While 32 per cent of Belarusians see union with Russia as the most appropriate foreign policy, 46 per cent would like to be in a union with both Russia and the EU simultaneously.
  • Almost half the population thinks that Belarusian foreign policy in the event of a pro-protest government coming to power would be oriented toward friendship and cooperation with both Russia and the West, which correlates with how the majority thinks it should be. Although 42 per cent expect foreign policy would lean toward the EU in that situation, which is less acceptable: only 25 per cent think it ‘should’.
  • The proportion of respondents who think Belarus should remain in the Collective Security Treaty Organization is 58 per cent, while 35 per cent would like to see Belarus not belonging to any military bloc and a small share (seven per cent) would prefer Belarus to join NATO.
  • Almost half of the population considers Lukashenka to be the major obstacle for political stability and economic development and is sure he does not care about, and in fact is a threat to, independence.
  • In general, most Belarusians have a consolidated opinion that the authorities should start negotiating with opponents and free all political prisoners.
  • More than half of Belarusians think that Lukashenka must leave immediately or before the end of 2021, while 27 per cent think he should leave when his term ends in 2025. The opinion that Lukashenka should rule for another term beginning in 2025 is marginal – only ten per cent support this.
  • Expectations are not so optimistic though: only 26 per cent believe he will leave office this year. One in three thinks he will leave in 2025; a further 19 per cent say that he will stay on for further terms in office.
  • If Lukashenka doesn’t leave, people expect an increase in emigration and unemployment, the continuation of repression in all areas of life, falling exchange rates and the tightening of dependency on Russia.
  • Opinion on abortions is still consolidated, with only 19 per cent thinking they should be banned in most or all cases. The same applies to Lukashenka’s infamous statement that society in Belarus is not ready to have a female president: only 20 per cent agree with the opinion.
  • 52 per cent don’t think there is a problem of wage inequality between men and women in Belarus, while 37 per cent do see an issue.

Download a presentation of the survey’s main findings




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To be there when the picture is being painted [Protein Structure and Folding]

There is nothing quite like the excitement of discovery in science—of finding something no one else knew and seeing a story unfold. One has to be part of an emerging picture to feel the elation. These moments in a lifetime are few and far between, but they fuel enthusiasm and keep one going. They are embedded in struggles and joys of everyday life, years of establishing what Louis Pasteur called “the prepared mind,” working with mentors, trainees, and colleagues, failures and successes. This article recalls 1) how I got to be a biochemist; 2) my contributions as an educator and researcher, especially regarding meprin metalloproteases; and 3) my participation in communities of science. Perhaps my reflections will help an aspiring scientist see how fulfilling a career in science can be.




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Mycobacteria excise DNA damage in 12- or 13-nucleotide-long oligomers by prokaryotic-type dual incisions and performs transcription-coupled repair [Genomics and Proteomics]

In nucleotide excision repair, bulky DNA lesions such as UV-induced cyclobutane pyrimidine dimers are removed from the genome by concerted dual incisions bracketing the lesion, followed by gap filling and ligation. So far, two dual-incision patterns have been discovered: the prokaryotic type, which removes the damage in 11–13-nucleotide-long oligomers, and the eukaryotic type, which removes the damage in 24–32-nucleotide-long oligomers. However, a recent study reported that the UvrC protein of Mycobacterium tuberculosis removes damage in a manner analogous to yeast and humans in a 25-mer oligonucleotide arising from incisions at 15 nt from the 3´ end and 9 nt from the 5´ end flanking the damage. To test this model, we used the in vivo excision assay and the excision repair sequencing genome-wide repair mapping method developed in our laboratory to determine the repair pattern and genome-wide repair map of Mycobacterium smegmatis. We find that M. smegmatis, which possesses homologs of the Escherichia coli uvrA, uvrB, and uvrC genes, removes cyclobutane pyrimidine dimers from the genome in a manner identical to the prokaryotic pattern by incising 7 nt 5´ and 3 or 4 nt 3´ to the photoproduct, and performs transcription-coupled repair in a manner similar to E. coli.




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Nonspecific DNA binding by P1 ParA determines the distribution of plasmid partition and repressor activities [Microbiology]

The faithful segregation, or “partition,” of many low-copy number bacterial plasmids is driven by plasmid-encoded ATPases that are represented by the P1 plasmid ParA protein. ParA binds to the bacterial nucleoid via an ATP-dependent nonspecific DNA (nsDNA)-binding activity, which is essential for partition. ParA also has a site-specific DNA-binding activity to the par operator (parOP), which requires either ATP or ADP, and which is essential for it to act as a transcriptional repressor but is dispensable for partition. Here we examine how DNA binding by ParA contributes to the relative distribution of its plasmid partition and repressor activities, using a ParA with an alanine substitution at Arg351, a residue previously predicted to participate in site-specific DNA binding. In vivo, the parAR351A allele is compromised for partition, but its repressor activity is dramatically improved so that it behaves as a “super-repressor.” In vitro, ParAR351A binds and hydrolyzes ATP, and undergoes a specific conformational change required for nsDNA binding, but its nsDNA-binding activity is significantly damaged. This defect in turn significantly reduces the assembly and stability of partition complexes formed by the interaction of ParA with ParB, the centromere-binding protein, and DNA. In contrast, the R351A change shows only a mild defect in site-specific DNA binding. We conclude that the partition defect is due to altered nsDNA binding kinetics and affinity for the bacterial chromosome. Furthermore, the super-repressor phenotype is explained by an increased pool of non-nucleoid bound ParA that is competent to bind parOP and repress transcription.




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A human cancer cell line initiates DNA replication normally in the absence of ORC5 and ORC2 proteins [DNA and Chromosomes]

The origin recognition complex (ORC), composed of six subunits, ORC1–6, binds to origins of replication as a ring-shaped heterohexameric ATPase that is believed to be essential to recruit and load MCM2–7, the minichromosome maintenance protein complex, around DNA and initiate DNA replication. We previously reported the creation of viable cancer cell lines that lacked detectable ORC1 or ORC2 protein without a reduction in the number of origins firing. Here, using CRISPR-Cas9–mediated mutations, we report that human HCT116 colon cancer cells also survive when ORC5 protein expression is abolished via a mutation in the initiator ATG of the ORC5 gene. Even if an internal methionine is used to produce an undetectable, N terminally deleted ORC5, the protein would lack 80% of the AAA+ ATPase domain, including the Walker A motif. The ORC5-depleted cells show normal chromatin binding of MCM2–7 and initiate replication from a similar number of origins as WT cells. In addition, we introduced a second mutation in ORC2 in the ORC5 mutant cells, rendering both ORC5 and ORC2 proteins undetectable in the same cells and destabilizing the ORC1, ORC3, and ORC4 proteins. Yet the double mutant cells grow, recruit MCM2–7 normally to chromatin, and initiate DNA replication with normal number of origins. Thus, in these selected cancer cells, either a crippled ORC lacking ORC2 and ORC5 and present at minimal levels on the chromatin can recruit and load enough MCM2–7 to initiate DNA replication, or human cell lines can sometimes recruit MCM2–7 to origins independent of ORC.




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Genetic evidence for the involvement of mismatch repair proteins, PMS2 and MLH3, in a late step of homologous recombination [Cell Biology]

Homologous recombination (HR) repairs DNA double-strand breaks using intact homologous sequences as template DNA. Broken DNA and intact homologous sequences form joint molecules (JMs), including Holliday junctions (HJs), as HR intermediates. HJs are resolved to form crossover and noncrossover products. A mismatch repair factor, MLH3 endonuclease, produces the majority of crossovers during meiotic HR, but it remains elusive whether mismatch repair factors promote HR in nonmeiotic cells. We disrupted genes encoding the MLH3 and PMS2 endonucleases in the human B cell line, TK6, generating null MLH3−/− and PMS2−/− mutant cells. We also inserted point mutations into the endonuclease motif of MLH3 and PMS2 genes, generating endonuclease death MLH3DN/DN and PMS2EK/EK cells. MLH3−/− and MLH3DN/DN cells showed a very similar phenotype, a 2.5-fold decrease in the frequency of heteroallelic HR-dependent repair of restriction enzyme–induced double-strand breaks. PMS2−/− and PMS2EK/EK cells showed a phenotype very similar to that of the MLH3 mutants. These data indicate that MLH3 and PMS2 promote HR as an endonuclease. The MLH3DN/DN and PMS2EK/EK mutations had an additive effect on the heteroallelic HR. MLH3DN/DN/PMS2EK/EK cells showed normal kinetics of γ-irradiation–induced Rad51 foci but a significant delay in the resolution of Rad51 foci and a 3-fold decrease in the number of cisplatin-induced sister chromatid exchanges. The ectopic expression of the Gen1 HJ re-solvase partially reversed the defective heteroallelic HR of MLH3DN/DN/PMS2EK/EK cells. Taken together, we propose that MLH3 and PMS2 promote HR as endonucleases, most likely by processing JMs in mammalian somatic cells.




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Uniform patch to mark 150 years of pro baseball

All 30 Major League teams will wear special "MLB 150" patches on their uniforms for the entire 2019 season in honor of the 150th anniversary of the 1869 Cincinnati Red Stockings, the first openly all-salaried professional baseball team.




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Predicting the Phillies' Opening Day roster

Phillies pitchers and catchers have their first workout Wednesday morning at Carpenter Complex. Almost anything can happen between Wednesday and Opening Day. That said, here is a very early prediction of the Phillies' Opening Day roster, knowing the Phillies remain in the hunt to sign Bryce Harper or Manny Machado.




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Kapler faces pressure, shifts focus to players

Gabe Kapler is trying to keep the focus on his players in 2019, but it might be an impossible task.




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Prospects who should vie for a roster spot

The 30 prospects below all are getting very long looks this spring with an eye toward breaking camp with the parent club. Even if they start the year in the Minors, they all should get the chance to contribute at some point in the very near future.




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Phillies' Top 30 Prospects list

Who do the Phillies have in the pipeline? Get scouting reports, video, stats, projected ETAs and more for Philly's Top 30 Prospects on MLBPipeline.com's Prospect Watch.




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The Phillies' Spring Training battle to watch

The next five weeks will see lots of shuffling on Major League rosters. Here are the most intriguing positional battles on each of the 30 MLB clubs.