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  • 11
    Publication Date: 2014-11-05
    Description: Solution-processed optoelectronic and electronic devices are attractive owing to the potential for low-cost fabrication of large-area devices and the compatibility with lightweight, flexible plastic substrates. Solution-processed light-emitting diodes (LEDs) using conjugated polymers or quantum dots as emitters have attracted great interest over the past two decades. However, the overall performance of solution-processed LEDs--including their efficiency, efficiency roll-off at high current densities, turn-on voltage and lifetime under operational conditions-remains inferior to that of the best vacuum-deposited organic LEDs. Here we report a solution-processed, multilayer quantum-dot-based LED with excellent performance and reproducibility. It exhibits colour-saturated deep-red emission, sub-bandgap turn-on at 1.7 volts, high external quantum efficiencies of up to 20.5 per cent, low efficiency roll-off (up to 15.1 per cent of the external quantum efficiency at 100 mA cm(-2)), and a long operational lifetime of more than 100,000 hours at 100 cd m(-2), making this device the best-performing solution-processed red LED so far, comparable to state-of-the-art vacuum-deposited organic LEDs. This optoelectronic performance is achieved by inserting an insulating layer between the quantum dot layer and the oxide electron-transport layer to optimize charge balance in the device and preserve the superior emissive properties of the quantum dots. We anticipate that our results will be a starting point for further research, leading to high-performance, all-solution-processed quantum-dot-based LEDs ideal for next-generation display and solid-state lighting technologies.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Dai, Xingliang -- Zhang, Zhenxing -- Jin, Yizheng -- Niu, Yuan -- Cao, Hujia -- Liang, Xiaoyong -- Chen, Liwei -- Wang, Jianpu -- Peng, Xiaogang -- England -- Nature. 2014 Nov 6;515(7525):96-9. doi: 10.1038/nature13829. Epub 2014 Oct 29.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Center for Chemistry of High-Performance &Novel Materials, State Key Laboratory of Silicon Materials, Cyrus Tang Center for Sensor Materials and Applications, School of Materials Science and Engineering, Zhejiang University, Hangzhou 310027, China. ; Center for Chemistry of High-Performance &Novel Materials, Department of Chemistry, Zhejiang University, Hangzhou 310027, China. ; i-Lab, Suzhou Institute of Nano-Tech and Nano-Bionics, Chinese Academy of Sciences, 398 Ruoshui Road, Suzhou Industrial Park, Suzhou 215123, China. ; Key Laboratory of Flexible Electronics (KLOFE) &Institute of Advanced Materials (IAM), National Jiangsu Synergistic Innovation Center for Advanced Materials (SICAM), Nanjing Tech University (NanjingTech), 30 South Puzhu Road, Nanjing 211816, China.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/25363773" target="_blank"〉PubMed〈/a〉
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  • 12
    Publication Date: 2014-03-05
    Description: Antibodies capable of neutralizing HIV-1 often target variable regions 1 and 2 (V1V2) of the HIV-1 envelope, but the mechanism of their elicitation has been unclear. Here we define the developmental pathway by which such antibodies are generated and acquire the requisite molecular characteristics for neutralization. Twelve somatically related neutralizing antibodies (CAP256-VRC26.01-12) were isolated from donor CAP256 (from the Centre for the AIDS Programme of Research in South Africa (CAPRISA)); each antibody contained the protruding tyrosine-sulphated, anionic antigen-binding loop (complementarity-determining region (CDR) H3) characteristic of this category of antibodies. Their unmutated ancestor emerged between weeks 30-38 post-infection with a 35-residue CDR H3, and neutralized the virus that superinfected this individual 15 weeks after initial infection. Improved neutralization breadth and potency occurred by week 59 with modest affinity maturation, and was preceded by extensive diversification of the virus population. HIV-1 V1V2-directed neutralizing antibodies can thus develop relatively rapidly through initial selection of B cells with a long CDR H3, and limited subsequent somatic hypermutation. These data provide important insights relevant to HIV-1 vaccine development.〈br /〉〈br /〉〈a href="https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4395007/" target="_blank"〉〈img src="https://static.pubmed.gov/portal/portal3rc.fcgi/4089621/img/3977009" border="0"〉〈/a〉   〈a href="https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4395007/" target="_blank"〉This paper as free author manuscript - peer-reviewed and accepted for publication〈/a〉〈br /〉〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Doria-Rose, Nicole A -- Schramm, Chaim A -- Gorman, Jason -- Moore, Penny L -- Bhiman, Jinal N -- DeKosky, Brandon J -- Ernandes, Michael J -- Georgiev, Ivelin S -- Kim, Helen J -- Pancera, Marie -- Staupe, Ryan P -- Altae-Tran, Han R -- Bailer, Robert T -- Crooks, Ema T -- Cupo, Albert -- Druz, Aliaksandr -- Garrett, Nigel J -- Hoi, Kam H -- Kong, Rui -- Louder, Mark K -- Longo, Nancy S -- McKee, Krisha -- Nonyane, Molati -- O'Dell, Sijy -- Roark, Ryan S -- Rudicell, Rebecca S -- Schmidt, Stephen D -- Sheward, Daniel J -- Soto, Cinque -- Wibmer, Constantinos Kurt -- Yang, Yongping -- Zhang, Zhenhai -- NISC Comparative Sequencing Program -- Mullikin, James C -- Binley, James M -- Sanders, Rogier W -- Wilson, Ian A -- Moore, John P -- Ward, Andrew B -- Georgiou, George -- Williamson, Carolyn -- Abdool Karim, Salim S -- Morris, Lynn -- Kwong, Peter D -- Shapiro, Lawrence -- Mascola, John R -- P01 AI082362/AI/NIAID NIH HHS/ -- R01 AI100790/AI/NIAID NIH HHS/ -- UM1 AI100663/AI/NIAID NIH HHS/ -- Intramural NIH HHS/ -- Wellcome Trust/United Kingdom -- England -- Nature. 2014 May 1;509(7498):55-62. doi: 10.1038/nature13036. Epub 2014 Mar 2.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉1] Vaccine Research Center, National Institute of Allergy and Infectious Diseases, National Institutes of Health, Bethesda, Maryland 20892, USA [2]. ; 1] Department of Biochemistry, Columbia University, New York, New York 10032, USA [2]. ; 1] Center for HIV and STIs, National Institute for Communicable Diseases of the National Health Laboratory Service (NHLS), Johannesburg, 2131, South Africa [2] Faculty of Health Sciences, University of the Witwatersrand, Johannesburg, 2050, South Africa [3] Centre for the AIDS Programme of Research in South Africa (CAPRISA), University of KwaZulu-Natal, Congella, 4013, South Africa [4]. ; 1] Center for HIV and STIs, National Institute for Communicable Diseases of the National Health Laboratory Service (NHLS), Johannesburg, 2131, South Africa [2] Faculty of Health Sciences, University of the Witwatersrand, Johannesburg, 2050, South Africa. ; Department of Chemical Engineering, University of Texas at Austin, Austin, Texas 78712, USA. ; Vaccine Research Center, National Institute of Allergy and Infectious Diseases, National Institutes of Health, Bethesda, Maryland 20892, USA. ; 1] Department of Integrative Structural and Computational Biology, The Scripps Research Institute, La Jolla, California 92037, USA [2] Center for HIV/AIDS Vaccine Immunology and Immunogen Discovery, The Scripps Research Institute, La Jolla, California 92037, USA [3] IAVI Neutralizing Antibody Center, The Scripps Research Institute, La Jolla, California 92037, USA. ; Torrey Pines Institute, San Diego, California 92037, USA. ; Weill Medical College of Cornell University, New York, New York 10065, USA. ; Centre for the AIDS Programme of Research in South Africa (CAPRISA), University of KwaZulu-Natal, Congella, 4013, South Africa. ; Department of Biomedical Engineering, University of Texas at Austin, Austin, Texas, USA. ; Center for HIV and STIs, National Institute for Communicable Diseases of the National Health Laboratory Service (NHLS), Johannesburg, 2131, South Africa. ; Institute of Infectious Diseases and Molecular Medicine, Division of Medical Virology, University of Cape Town and NHLS, Cape Town 7701, South Africa. ; Department of Biochemistry, Columbia University, New York, New York 10032, USA. ; 1] NISC Comparative Sequencing program, National Institutes of Health, Bethesda, Maryland 20892, USA [2] NIH Intramural Sequencing Center, National Human Genome Research Institute, National Institutes of Health, Bethesda, Maryland 20892, USA. ; Department of Medical Microbiology, Academic Medical Center, Amsterdam 1105 AZ, Netherlands. ; 1] Department of Integrative Structural and Computational Biology, The Scripps Research Institute, La Jolla, California 92037, USA [2] Center for HIV/AIDS Vaccine Immunology and Immunogen Discovery, The Scripps Research Institute, La Jolla, California 92037, USA [3] IAVI Neutralizing Antibody Center, The Scripps Research Institute, La Jolla, California 92037, USA [4] Skaggs Institute for Chemical Biology, The Scripps Research Institute, La Jolla, California 92037, USA. ; 1] Department of Chemical Engineering, University of Texas at Austin, Austin, Texas 78712, USA [2] Department of Biomedical Engineering, University of Texas at Austin, Austin, Texas, USA [3] Department of Molecular Biosciences, University of Texas at Austin, Austin, Texas 78712, USA. ; 1] Centre for the AIDS Programme of Research in South Africa (CAPRISA), University of KwaZulu-Natal, Congella, 4013, South Africa [2] Institute of Infectious Diseases and Molecular Medicine, Division of Medical Virology, University of Cape Town and NHLS, Cape Town 7701, South Africa. ; 1] Centre for the AIDS Programme of Research in South Africa (CAPRISA), University of KwaZulu-Natal, Congella, 4013, South Africa [2] Department of Epidemiology, Columbia University, New York, New York 10032, USA. ; 1] Center for HIV and STIs, National Institute for Communicable Diseases of the National Health Laboratory Service (NHLS), Johannesburg, 2131, South Africa [2] Faculty of Health Sciences, University of the Witwatersrand, Johannesburg, 2050, South Africa [3] Centre for the AIDS Programme of Research in South Africa (CAPRISA), University of KwaZulu-Natal, Congella, 4013, South Africa. ; 1] Vaccine Research Center, National Institute of Allergy and Infectious Diseases, National Institutes of Health, Bethesda, Maryland 20892, USA [2] Department of Biochemistry, Columbia University, New York, New York 10032, USA.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/24590074" target="_blank"〉PubMed〈/a〉
    Keywords: AIDS Vaccines/chemistry/immunology ; Amino Acid Sequence ; Antibodies, Neutralizing/chemistry/genetics/*immunology/isolation & purification ; Antibody Affinity/genetics/immunology ; Antigens, CD4/immunology/metabolism ; B-Lymphocytes/cytology/immunology/metabolism ; Binding Sites/immunology ; Cell Lineage ; Complementarity Determining Regions/chemistry/genetics/immunology ; Epitope Mapping ; Epitopes, B-Lymphocyte/chemistry/immunology ; Evolution, Molecular ; HIV Antibodies/chemistry/genetics/*immunology/isolation & purification ; HIV Envelope Protein gp160/*chemistry/*immunology ; HIV Infections/immunology ; HIV-1/chemistry/immunology ; Humans ; Models, Molecular ; Molecular Sequence Data ; Neutralization Tests ; Protein Structure, Tertiary ; Somatic Hypermutation, Immunoglobulin/genetics
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  • 13
    Publication Date: 2010-02-19
    Description: The genetic structure of the indigenous hunter-gatherer peoples of southern Africa, the oldest known lineage of modern human, is important for understanding human diversity. Studies based on mitochondrial and small sets of nuclear markers have shown that these hunter-gatherers, known as Khoisan, San, or Bushmen, are genetically divergent from other humans. However, until now, fully sequenced human genomes have been limited to recently diverged populations. Here we present the complete genome sequences of an indigenous hunter-gatherer from the Kalahari Desert and a Bantu from southern Africa, as well as protein-coding regions from an additional three hunter-gatherers from disparate regions of the Kalahari. We characterize the extent of whole-genome and exome diversity among the five men, reporting 1.3 million novel DNA differences genome-wide, including 13,146 novel amino acid variants. In terms of nucleotide substitutions, the Bushmen seem to be, on average, more different from each other than, for example, a European and an Asian. Observed genomic differences between the hunter-gatherers and others may help to pinpoint genetic adaptations to an agricultural lifestyle. Adding the described variants to current databases will facilitate inclusion of southern Africans in medical research efforts, particularly when family and medical histories can be correlated with genome-wide data.〈br /〉〈br /〉〈a href="https://www.ncbi.nlm.nih.gov/pmc/articles/PMC3890430/" target="_blank"〉〈img src="https://static.pubmed.gov/portal/portal3rc.fcgi/4089621/img/3977009" border="0"〉〈/a〉   〈a href="https://www.ncbi.nlm.nih.gov/pmc/articles/PMC3890430/" target="_blank"〉This paper as free author manuscript - peer-reviewed and accepted for publication〈/a〉〈br /〉〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Schuster, Stephan C -- Miller, Webb -- Ratan, Aakrosh -- Tomsho, Lynn P -- Giardine, Belinda -- Kasson, Lindsay R -- Harris, Robert S -- Petersen, Desiree C -- Zhao, Fangqing -- Qi, Ji -- Alkan, Can -- Kidd, Jeffrey M -- Sun, Yazhou -- Drautz, Daniela I -- Bouffard, Pascal -- Muzny, Donna M -- Reid, Jeffrey G -- Nazareth, Lynne V -- Wang, Qingyu -- Burhans, Richard -- Riemer, Cathy -- Wittekindt, Nicola E -- Moorjani, Priya -- Tindall, Elizabeth A -- Danko, Charles G -- Teo, Wee Siang -- Buboltz, Anne M -- Zhang, Zhenhai -- Ma, Qianyi -- Oosthuysen, Arno -- Steenkamp, Abraham W -- Oostuisen, Hermann -- Venter, Philippus -- Gajewski, John -- Zhang, Yu -- Pugh, B Franklin -- Makova, Kateryna D -- Nekrutenko, Anton -- Mardis, Elaine R -- Patterson, Nick -- Pringle, Tom H -- Chiaromonte, Francesca -- Mullikin, James C -- Eichler, Evan E -- Hardison, Ross C -- Gibbs, Richard A -- Harkins, Timothy T -- Hayes, Vanessa M -- R01 GM087472/GM/NIGMS NIH HHS/ -- R01 HG004909/HG/NHGRI NIH HHS/ -- R01GM087472/GM/NIGMS NIH HHS/ -- U54 HG003273/HG/NHGRI NIH HHS/ -- Intramural NIH HHS/ -- England -- Nature. 2010 Feb 18;463(7283):943-7. doi: 10.1038/nature08795.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Pennsylvania State University, Center for Comparative Genomics and Bioinformatics, 310 Wartik Lab, University Park, Pennsylvania 16802, USA. scs@bx.psu.edu〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/20164927" target="_blank"〉PubMed〈/a〉
    Keywords: African Continental Ancestry Group/*genetics ; Asian Continental Ancestry Group/genetics ; Ethnic Groups/*genetics ; European Continental Ancestry Group/genetics ; Exons/genetics ; Genetics, Medical ; Genome, Human/*genetics ; Humans ; Phylogeny ; Polymorphism, Single Nucleotide/genetics ; South Africa/ethnology
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  • 14
    Publication Date: 2011-02-26
    Description: Cambrian fossil Lagerstatten preserving soft-bodied organisms have contributed much towards our understanding of metazoan origins. Lobopodians are a particularly interesting group that diversified and flourished in the Cambrian seas. Resembling 'worms with legs', they have long attracted much attention in that they may have given rise to both Onychophora (velvet worms) and Tardigrada (water bears), as well as to arthropods in general. Here we describe Diania cactiformis gen. et sp. nov. as an 'armoured' lobopodian from the Chengjiang fossil Lagerstatte (Cambrian Stage 3), Yunnan, southwestern China. Although sharing features with other typical lobopodians, it is remarkable for possessing robust and probably sclerotized appendages, with what appear to be articulated elements. In terms of limb morphology it is therefore closer to the arthropod condition, to our knowledge, than any lobopodian recorded until now. Phylogenetic analysis recovers it in a derived position, close to Arthropoda; thus, it seems to belong to a grade of organization close to the point of becoming a true arthropod. Further, D. cactiformis could imply that arthropodization (sclerotization of the limbs) preceded arthrodization (sclerotization of the body). Comparing our fossils with other lobopodian appendage morphologies--see Kerygmachela, Jianshanopodia and Megadictyon--reinforces the hypothesis that the group as a whole is paraphyletic, with different taxa expressing different grades of arthropodization.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Liu, Jianni -- Steiner, Michael -- Dunlop, Jason A -- Keupp, Helmut -- Shu, Degan -- Ou, Qiang -- Han, Jian -- Zhang, Zhifei -- Zhang, Xingliang -- England -- Nature. 2011 Feb 24;470(7335):526-30. doi: 10.1038/nature09704.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Early Life Institute, State Key Laboratory of Continental Dynamics, Department of Geology, Northwest University, Xi'an 710069, China. liujianni@126.com〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/21350485" target="_blank"〉PubMed〈/a〉
    Keywords: Animals ; Arthropods/*anatomy & histology/*classification ; China ; Extinction, Biological ; Extremities/*anatomy & histology ; *Fossils ; *Phylogeny
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  • 15
    Publication Date: 2010-11-26
    Description: The ubiquitylation of cell-cycle regulatory proteins by the large multimeric anaphase-promoting complex (APC/C) controls sister chromatid segregation and the exit from mitosis. Selection of APC/C targets is achieved through recognition of destruction motifs, predominantly the destruction (D)-box and KEN (Lys-Glu-Asn)-box. Although this process is known to involve a co-activator protein (either Cdc20 or Cdh1) together with core APC/C subunits, the structural basis for substrate recognition and ubiquitylation is not understood. Here we investigate budding yeast APC/C using single-particle electron microscopy and determine a cryo-electron microscopy map of APC/C in complex with the Cdh1 co-activator protein (APC/C(Cdh1)) bound to a D-box peptide at approximately 10 A resolution. We find that a combined catalytic and substrate-recognition module is located within the central cavity of the APC/C assembled from Cdh1, Apc10--a core APC/C subunit previously implicated in substrate recognition--and the cullin domain of Apc2. Cdh1 and Apc10, identified from difference maps, create a co-receptor for the D-box following repositioning of Cdh1 towards Apc10. Using NMR spectroscopy we demonstrate specific D-box-Apc10 interactions, consistent with a role for Apc10 in directly contributing towards D-box recognition by the APC/C(Cdh1) complex. Our results rationalize the contribution of both co-activator and core APC/C subunits to D-box recognition and provide a structural framework for understanding mechanisms of substrate recognition and catalysis by the APC/C.〈br /〉〈br /〉〈a href="https://www.ncbi.nlm.nih.gov/pmc/articles/PMC3037847/" target="_blank"〉〈img src="https://static.pubmed.gov/portal/portal3rc.fcgi/4089621/img/3977009" border="0"〉〈/a〉   〈a href="https://www.ncbi.nlm.nih.gov/pmc/articles/PMC3037847/" target="_blank"〉This paper as free author manuscript - peer-reviewed and accepted for publication〈/a〉〈br /〉〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉da Fonseca, Paula C A -- Kong, Eric H -- Zhang, Ziguo -- Schreiber, Anne -- Williams, Mark A -- Morris, Edward P -- Barford, David -- A7403/Cancer Research UK/United Kingdom -- A8022/Cancer Research UK/United Kingdom -- Cancer Research UK/United Kingdom -- England -- Nature. 2011 Feb 10;470(7333):274-8. doi: 10.1038/nature09625. Epub 2010 Nov 24.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Section of Structural Biology, Institute of Cancer Research, Chester Beatty Laboratories, 237 Fulham Road, London SW3 6JB, UK.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/21107322" target="_blank"〉PubMed〈/a〉
    Keywords: Amino Acid Motifs ; Anaphase-Promoting Complex-Cyclosome ; Apc10 Subunit, Anaphase-Promoting Complex-Cyclosome ; Apc2 Subunit, Anaphase-Promoting Complex-Cyclosome ; Biocatalysis ; Cdh1 Proteins ; Cell Cycle Proteins/chemistry/*metabolism/ultrastructure ; Cryoelectron Microscopy ; Models, Molecular ; Nuclear Magnetic Resonance, Biomolecular ; Peptides/*chemistry/*metabolism ; Protein Binding ; Protein Conformation ; Saccharomyces cerevisiae/*chemistry ; Saccharomyces cerevisiae Proteins/chemistry/*metabolism/ultrastructure ; Substrate Specificity ; Ubiquitin-Protein Ligase Complexes/*chemistry/*metabolism/ultrastructure ; Ubiquitination
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  • 16
    Publication Date: 2012-02-03
    Description: Colour sidedness is a dominantly inherited phenotype of cattle characterized by the polarization of pigmented sectors on the flanks, snout and ear tips. It is also referred to as 'lineback' or 'witrik' (which means white back), as colour-sided animals typically display a white band along their spine. Colour sidedness is documented at least since the Middle Ages and is presently segregating in several cattle breeds around the globe, including in Belgian blue and brown Swiss. Here we report that colour sidedness is determined by a first allele on chromosome 29 (Cs(29)), which results from the translocation of a 492-kilobase chromosome 6 segment encompassing KIT to chromosome 29, and a second allele on chromosome 6 (Cs(6)), derived from the first by repatriation of fused 575-kilobase chromosome 6 and 29 sequences to the KIT locus. We provide evidence that both translocation events involved circular intermediates. This is the first example, to our knowledge, of a phenotype determined by homologous yet non-syntenic alleles that result from a novel copy-number-variant-generating mechanism.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Durkin, Keith -- Coppieters, Wouter -- Drogemuller, Cord -- Ahariz, Naima -- Cambisano, Nadine -- Druet, Tom -- Fasquelle, Corinne -- Haile, Aynalem -- Horin, Petr -- Huang, Lusheng -- Kamatani, Yohichiro -- Karim, Latifa -- Lathrop, Mark -- Moser, Simon -- Oldenbroek, Kor -- Rieder, Stefan -- Sartelet, Arnaud -- Solkner, Johann -- Stalhammar, Hans -- Zelenika, Diana -- Zhang, Zhiyan -- Leeb, Tosso -- Georges, Michel -- Charlier, Carole -- England -- Nature. 2012 Feb 1;482(7383):81-4. doi: 10.1038/nature10757.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Unit of Animal Genomics, GIGA-R & Faculty of Veterinary Medicine, University of Liege, 4000-Liege (Sart Tilman), Belgium.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/22297974" target="_blank"〉PubMed〈/a〉
    Keywords: Alleles ; Animals ; Cattle/classification/*genetics ; Chromosome Mapping ; Chromosomes, Mammalian/*genetics ; DNA Copy Number Variations/genetics ; Gene Duplication/genetics ; Gene Fusion/genetics ; Genome-Wide Association Study ; Genotype ; Hair Color/*genetics ; In Situ Hybridization, Fluorescence ; Phenotype ; Polymorphism, Single Nucleotide/genetics ; Translocation, Genetic/*genetics
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  • 17
    Publication Date: 2012-03-23
    Description: In mitosis, the spindle assembly checkpoint (SAC) ensures genome stability by delaying chromosome segregation until all sister chromatids have achieved bipolar attachment to the mitotic spindle. The SAC is imposed by the mitotic checkpoint complex (MCC), whose assembly is catalysed by unattached chromosomes and which binds and inhibits the anaphase-promoting complex/cyclosome (APC/C), the E3 ubiquitin ligase that initiates chromosome segregation. Here, using the crystal structure of Schizosaccharomyces pombe MCC (a complex of mitotic spindle assembly checkpoint proteins Mad2, Mad3 and APC/C co-activator protein Cdc20), we reveal the molecular basis of MCC-mediated APC/C inhibition and the regulation of MCC assembly. The MCC inhibits the APC/C by obstructing degron recognition sites on Cdc20 (the substrate recruitment subunit of the APC/C) and displacing Cdc20 to disrupt formation of a bipartite D-box receptor with the APC/C subunit Apc10. Mad2, in the closed conformation (C-Mad2), stabilizes the complex by optimally positioning the Mad3 KEN-box degron to bind Cdc20. Mad3 and p31(comet) (also known as MAD2L1-binding protein) compete for the same C-Mad2 interface, which explains how p31(comet) disrupts MCC assembly to antagonize the SAC. This study shows how APC/C inhibition is coupled to degron recognition by co-activators.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Chao, William C H -- Kulkarni, Kiran -- Zhang, Ziguo -- Kong, Eric H -- Barford, David -- Cancer Research UK/United Kingdom -- England -- Nature. 2012 Mar 21;484(7393):208-13. doi: 10.1038/nature10896.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Division of Structural Biology, Institute of Cancer Research, Chester Beatty Laboratories, 237 Fulham Road, London, SW3 6JB, UK.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/22437499" target="_blank"〉PubMed〈/a〉
    Keywords: Amino Acid Motifs ; Anaphase-Promoting Complex-Cyclosome ; Cdc20 Proteins ; Cdh1 Proteins ; Cell Cycle Proteins/*chemistry/metabolism ; Conserved Sequence ; Crystallography, X-Ray ; Humans ; *M Phase Cell Cycle Checkpoints ; Mad2 Proteins ; Models, Molecular ; Multiprotein Complexes/*chemistry/metabolism ; Nuclear Proteins/*chemistry/metabolism ; Protein Structure, Quaternary ; Protein Structure, Tertiary ; Saccharomyces cerevisiae Proteins/chemistry/genetics/metabolism ; Schizosaccharomyces/*chemistry ; Schizosaccharomyces pombe Proteins/*chemistry/metabolism ; Spindle Apparatus ; Structure-Activity Relationship ; Substrate Specificity ; Ubiquitin-Protein Ligase Complexes/antagonists & ; inhibitors/chemistry/metabolism/ultrastructure
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  • 18
    Publication Date: 2012-09-08
    Description: DNase I hypersensitive sites (DHSs) are markers of regulatory DNA and have underpinned the discovery of all classes of cis-regulatory elements including enhancers, promoters, insulators, silencers and locus control regions. Here we present the first extensive map of human DHSs identified through genome-wide profiling in 125 diverse cell and tissue types. We identify approximately 2.9 million DHSs that encompass virtually all known experimentally validated cis-regulatory sequences and expose a vast trove of novel elements, most with highly cell-selective regulation. Annotating these elements using ENCODE data reveals novel relationships between chromatin accessibility, transcription, DNA methylation and regulatory factor occupancy patterns. We connect approximately 580,000 distal DHSs with their target promoters, revealing systematic pairing of different classes of distal DHSs and specific promoter types. Patterning of chromatin accessibility at many regulatory regions is organized with dozens to hundreds of co-activated elements, and the transcellular DNase I sensitivity pattern at a given region can predict cell-type-specific functional behaviours. The DHS landscape shows signatures of recent functional evolutionary constraint. However, the DHS compartment in pluripotent and immortalized cells exhibits higher mutation rates than that in highly differentiated cells, exposing an unexpected link between chromatin accessibility, proliferative potential and patterns of human variation.〈br /〉〈br /〉〈a href="https://www.ncbi.nlm.nih.gov/pmc/articles/PMC3721348/" target="_blank"〉〈img src="https://static.pubmed.gov/portal/portal3rc.fcgi/4089621/img/3977009" border="0"〉〈/a〉   〈a href="https://www.ncbi.nlm.nih.gov/pmc/articles/PMC3721348/" target="_blank"〉This paper as free author manuscript - peer-reviewed and accepted for publication〈/a〉〈br /〉〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Thurman, Robert E -- Rynes, Eric -- Humbert, Richard -- Vierstra, Jeff -- Maurano, Matthew T -- Haugen, Eric -- Sheffield, Nathan C -- Stergachis, Andrew B -- Wang, Hao -- Vernot, Benjamin -- Garg, Kavita -- John, Sam -- Sandstrom, Richard -- Bates, Daniel -- Boatman, Lisa -- Canfield, Theresa K -- Diegel, Morgan -- Dunn, Douglas -- Ebersol, Abigail K -- Frum, Tristan -- Giste, Erika -- Johnson, Audra K -- Johnson, Ericka M -- Kutyavin, Tanya -- Lajoie, Bryan -- Lee, Bum-Kyu -- Lee, Kristen -- London, Darin -- Lotakis, Dimitra -- Neph, Shane -- Neri, Fidencio -- Nguyen, Eric D -- Qu, Hongzhu -- Reynolds, Alex P -- Roach, Vaughn -- Safi, Alexias -- Sanchez, Minerva E -- Sanyal, Amartya -- Shafer, Anthony -- Simon, Jeremy M -- Song, Lingyun -- Vong, Shinny -- Weaver, Molly -- Yan, Yongqi -- Zhang, Zhancheng -- Zhang, Zhuzhu -- Lenhard, Boris -- Tewari, Muneesh -- Dorschner, Michael O -- Hansen, R Scott -- Navas, Patrick A -- Stamatoyannopoulos, George -- Iyer, Vishwanath R -- Lieb, Jason D -- Sunyaev, Shamil R -- Akey, Joshua M -- Sabo, Peter J -- Kaul, Rajinder -- Furey, Terrence S -- Dekker, Job -- Crawford, Gregory E -- Stamatoyannopoulos, John A -- F30 DK095678/DK/NIDDK NIH HHS/ -- GM076036/GM/NIGMS NIH HHS/ -- HG004563/HG/NHGRI NIH HHS/ -- HG004592/HG/NHGRI NIH HHS/ -- HHSN261200800001E/PHS HHS/ -- MC_UP_1102/1/Medical Research Council/United Kingdom -- P30 CA016086/CA/NCI NIH HHS/ -- R01 GM076036/GM/NIGMS NIH HHS/ -- R01 HG003143/HG/NHGRI NIH HHS/ -- R01 MH084676/MH/NIMH NIH HHS/ -- R01MH084676/MH/NIMH NIH HHS/ -- U54 HG004563/HG/NHGRI NIH HHS/ -- U54 HG004592/HG/NHGRI NIH HHS/ -- England -- Nature. 2012 Sep 6;489(7414):75-82. doi: 10.1038/nature11232.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Department of Genome Sciences, University of Washington, Seattle, Washington 98195, USA.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/22955617" target="_blank"〉PubMed〈/a〉
    Keywords: Chromatin/*genetics/*metabolism ; DNA/*genetics ; DNA Footprinting ; DNA Methylation ; DNA-Binding Proteins/metabolism ; Deoxyribonuclease I/metabolism ; *Encyclopedias as Topic ; Evolution, Molecular ; Genome, Human/*genetics ; Genomics ; Humans ; *Molecular Sequence Annotation ; Mutation Rate ; Promoter Regions, Genetic/genetics ; Regulatory Sequences, Nucleic Acid/*genetics ; Transcription Factors/metabolism ; Transcription Initiation Site ; Transcription, Genetic
    Print ISSN: 0028-0836
    Electronic ISSN: 1476-4687
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
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  • 19
    Publication Date: 2012-10-02
    Description: Assessment and characterization of gut microbiota has become a major research area in human disease, including type 2 diabetes, the most prevalent endocrine disease worldwide. To carry out analysis on gut microbial content in patients with type 2 diabetes, we developed a protocol for a metagenome-wide association study (MGWAS) and undertook a two-stage MGWAS based on deep shotgun sequencing of the gut microbial DNA from 345 Chinese individuals. We identified and validated approximately 60,000 type-2-diabetes-associated markers and established the concept of a metagenomic linkage group, enabling taxonomic species-level analyses. MGWAS analysis showed that patients with type 2 diabetes were characterized by a moderate degree of gut microbial dysbiosis, a decrease in the abundance of some universal butyrate-producing bacteria and an increase in various opportunistic pathogens, as well as an enrichment of other microbial functions conferring sulphate reduction and oxidative stress resistance. An analysis of 23 additional individuals demonstrated that these gut microbial markers might be useful for classifying type 2 diabetes.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Qin, Junjie -- Li, Yingrui -- Cai, Zhiming -- Li, Shenghui -- Zhu, Jianfeng -- Zhang, Fan -- Liang, Suisha -- Zhang, Wenwei -- Guan, Yuanlin -- Shen, Dongqian -- Peng, Yangqing -- Zhang, Dongya -- Jie, Zhuye -- Wu, Wenxian -- Qin, Youwen -- Xue, Wenbin -- Li, Junhua -- Han, Lingchuan -- Lu, Donghui -- Wu, Peixian -- Dai, Yali -- Sun, Xiaojuan -- Li, Zesong -- Tang, Aifa -- Zhong, Shilong -- Li, Xiaoping -- Chen, Weineng -- Xu, Ran -- Wang, Mingbang -- Feng, Qiang -- Gong, Meihua -- Yu, Jing -- Zhang, Yanyan -- Zhang, Ming -- Hansen, Torben -- Sanchez, Gaston -- Raes, Jeroen -- Falony, Gwen -- Okuda, Shujiro -- Almeida, Mathieu -- LeChatelier, Emmanuelle -- Renault, Pierre -- Pons, Nicolas -- Batto, Jean-Michel -- Zhang, Zhaoxi -- Chen, Hua -- Yang, Ruifu -- Zheng, Weimou -- Li, Songgang -- Yang, Huanming -- Wang, Jian -- Ehrlich, S Dusko -- Nielsen, Rasmus -- Pedersen, Oluf -- Kristiansen, Karsten -- Wang, Jun -- England -- Nature. 2012 Oct 4;490(7418):55-60. doi: 10.1038/nature11450. Epub 2012 Sep 26.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉BGI-Shenzhen, Shenzhen 518083, China.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/23023125" target="_blank"〉PubMed〈/a〉
    Keywords: Asian Continental Ancestry Group ; Butyrates/metabolism ; China/ethnology ; Cohort Studies ; Diabetes Mellitus, Type ; 2/classification/complications/*microbiology/physiopathology ; Feces/microbiology ; Genetic Linkage/genetics ; Genetic Markers ; Genome-Wide Association Study/*methods ; High-Throughput Nucleotide Sequencing ; Humans ; Intestines/*microbiology ; Metabolic Networks and Pathways/genetics ; Metagenome/*genetics ; Metagenomics/*methods ; Opportunistic Infections/complications/microbiology ; Reference Standards ; Sulfates/metabolism
    Print ISSN: 0028-0836
    Electronic ISSN: 1476-4687
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
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  • 20
    Publication Date: 2013-07-19
    Description: Binding of the glucagon peptide to the glucagon receptor (GCGR) triggers the release of glucose from the liver during fasting; thus GCGR plays an important role in glucose homeostasis. Here we report the crystal structure of the seven transmembrane helical domain of human GCGR at 3.4 A resolution, complemented by extensive site-specific mutagenesis, and a hybrid model of glucagon bound to GCGR to understand the molecular recognition of the receptor for its native ligand. Beyond the shared seven transmembrane fold, the GCGR transmembrane domain deviates from class A G-protein-coupled receptors with a large ligand-binding pocket and the first transmembrane helix having a 'stalk' region that extends three alpha-helical turns above the plane of the membrane. The stalk positions the extracellular domain (~12 kilodaltons) relative to the membrane to form the glucagon-binding site that captures the peptide and facilitates the insertion of glucagon's amino terminus into the seven transmembrane domain.〈br /〉〈br /〉〈a href="https://www.ncbi.nlm.nih.gov/pmc/articles/PMC3820480/" target="_blank"〉〈img src="https://static.pubmed.gov/portal/portal3rc.fcgi/4089621/img/3977009" border="0"〉〈/a〉   〈a href="https://www.ncbi.nlm.nih.gov/pmc/articles/PMC3820480/" target="_blank"〉This paper as free author manuscript - peer-reviewed and accepted for publication〈/a〉〈br /〉〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Siu, Fai Yiu -- He, Min -- de Graaf, Chris -- Han, Gye Won -- Yang, Dehua -- Zhang, Zhiyun -- Zhou, Caihong -- Xu, Qingping -- Wacker, Daniel -- Joseph, Jeremiah S -- Liu, Wei -- Lau, Jesper -- Cherezov, Vadim -- Katritch, Vsevolod -- Wang, Ming-Wei -- Stevens, Raymond C -- F32 DK088392/DK/NIDDK NIH HHS/ -- P50 GM073197/GM/NIGMS NIH HHS/ -- P50GM073197/GM/NIGMS NIH HHS/ -- U54 GM094586/GM/NIGMS NIH HHS/ -- U54 GM094618/GM/NIGMS NIH HHS/ -- Y1-CO-1020/CO/NCI NIH HHS/ -- Y1-GM-1104/GM/NIGMS NIH HHS/ -- England -- Nature. 2013 Jul 25;499(7459):444-9. doi: 10.1038/nature12393. Epub 2013 Jul 17.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Department of Integrative Structural and Computational Biology, The Scripps Research Institute, 10550 North Torrey Pines Road, La Jolla, California 92037, USA.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/23863937" target="_blank"〉PubMed〈/a〉
    Keywords: Amino Acid Sequence ; Binding Sites ; Cell Membrane/metabolism ; Crystallography, X-Ray ; Glucagon/chemistry/metabolism ; Humans ; Ligands ; Models, Molecular ; Molecular Sequence Data ; Mutagenesis, Site-Directed ; Protein Binding ; Protein Structure, Tertiary ; Receptors, CXCR4/chemistry/classification ; Receptors, Glucagon/*chemistry/*classification/genetics/metabolism
    Print ISSN: 0028-0836
    Electronic ISSN: 1476-4687
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
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