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  • Models, Molecular  (174)
  • Nature Publishing Group (NPG)  (174)
  • Institute of Physics
  • National Academy of Sciences
  • 2010-2014  (174)
  • 1955-1959
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  • 1
    Publication Date: 2014-04-04
    Description: Cancers have dysfunctional redox regulation resulting in reactive oxygen species production, damaging both DNA and free dNTPs. The MTH1 protein sanitizes oxidized dNTP pools to prevent incorporation of damaged bases during DNA replication. Although MTH1 is non-essential in normal cells, we show that cancer cells require MTH1 activity to avoid incorporation of oxidized dNTPs, resulting in DNA damage and cell death. We validate MTH1 as an anticancer target in vivo and describe small molecules TH287 and TH588 as first-in-class nudix hydrolase family inhibitors that potently and selectively engage and inhibit the MTH1 protein in cells. Protein co-crystal structures demonstrate that the inhibitors bind in the active site of MTH1. The inhibitors cause incorporation of oxidized dNTPs in cancer cells, leading to DNA damage, cytotoxicity and therapeutic responses in patient-derived mouse xenografts. This study exemplifies the non-oncogene addiction concept for anticancer treatment and validates MTH1 as being cancer phenotypic lethal.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Gad, Helge -- Koolmeister, Tobias -- Jemth, Ann-Sofie -- Eshtad, Saeed -- Jacques, Sylvain A -- Strom, Cecilia E -- Svensson, Linda M -- Schultz, Niklas -- Lundback, Thomas -- Einarsdottir, Berglind Osk -- Saleh, Aljona -- Gokturk, Camilla -- Baranczewski, Pawel -- Svensson, Richard -- Berntsson, Ronnie P-A -- Gustafsson, Robert -- Stromberg, Kia -- Sanjiv, Kumar -- Jacques-Cordonnier, Marie-Caroline -- Desroses, Matthieu -- Gustavsson, Anna-Lena -- Olofsson, Roger -- Johansson, Fredrik -- Homan, Evert J -- Loseva, Olga -- Brautigam, Lars -- Johansson, Lars -- Hoglund, Andreas -- Hagenkort, Anna -- Pham, Therese -- Altun, Mikael -- Gaugaz, Fabienne Z -- Vikingsson, Svante -- Evers, Bastiaan -- Henriksson, Martin -- Vallin, Karl S A -- Wallner, Olov A -- Hammarstrom, Lars G J -- Wiita, Elisee -- Almlof, Ingrid -- Kalderen, Christina -- Axelsson, Hanna -- Djureinovic, Tatjana -- Puigvert, Jordi Carreras -- Haggblad, Maria -- Jeppsson, Fredrik -- Martens, Ulf -- Lundin, Cecilia -- Lundgren, Bo -- Granelli, Ingrid -- Jensen, Annika Jenmalm -- Artursson, Per -- Nilsson, Jonas A -- Stenmark, Pal -- Scobie, Martin -- Berglund, Ulrika Warpman -- Helleday, Thomas -- England -- Nature. 2014 Apr 10;508(7495):215-21. doi: 10.1038/nature13181. Epub 2014 Apr 2.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉1] Science for Life Laboratory, Division of Translational Medicine and Chemical Biology, Department of Medical Biochemistry and Biophysics, Karolinska Institutet, S-171 21 Stockholm, Sweden [2]. ; Department of Biochemistry and Biophysics, Stockholm University, S-106 91 Stockholm, Sweden. ; Science for Life Laboratory, Division of Translational Medicine and Chemical Biology, Department of Medical Biochemistry and Biophysics, Karolinska Institutet, S-171 21 Stockholm, Sweden. ; 1] Science for Life Laboratory, Division of Translational Medicine and Chemical Biology, Department of Medical Biochemistry and Biophysics, Karolinska Institutet, S-171 21 Stockholm, Sweden [2] Chemical Biology Consortium Sweden, Science for Life Laboratory, Division of Translational Medicine and Chemical Biology, Department of Medical Biochemistry and Biophysics, Karolinska Institutet, S-171 21 Stockholm, Sweden. ; Sahlgrenska Translational Melanoma Group, Sahlgrenska Cancer Center, Department of Surgery, University of Gothenburg and Sahlgrenska University Hospital, S-405 30 Gothenburg, Sweden. ; Department of Analytical Chemistry, Stockholm University, S-106 91 Stockholm, Sweden. ; 1] Science for Life Laboratory, Division of Translational Medicine and Chemical Biology, Department of Medical Biochemistry and Biophysics, Karolinska Institutet, S-171 21 Stockholm, Sweden [2] Uppsala University Drug Optimization and Pharmaceutical Profiling Platform, Department of Pharmacy, Uppsala University, S-751 23 Uppsala, Sweden. ; 1] Chemical Biology Consortium Sweden, Science for Life Laboratory, Division of Translational Medicine and Chemical Biology, Department of Medical Biochemistry and Biophysics, Karolinska Institutet, S-171 21 Stockholm, Sweden [2] Uppsala University Drug Optimization and Pharmaceutical Profiling Platform, Department of Pharmacy, Uppsala University, S-751 23 Uppsala, Sweden. ; Department of Genetics, Microbiology and Toxicology, Stockholm University, S-106 91 Stockholm, Sweden. ; 1] Science for Life Laboratory, Division of Translational Medicine and Chemical Biology, Department of Medical Biochemistry and Biophysics, Karolinska Institutet, S-171 21 Stockholm, Sweden [2] Clinical Pharmacology, Department of Medical and Health Sciences, Linkoping University, S-58185 Linkoping, Sweden. ; 1] Science for Life Laboratory, Division of Translational Medicine and Chemical Biology, Department of Medical Biochemistry and Biophysics, Karolinska Institutet, S-171 21 Stockholm, Sweden [2] Division of Molecular Carcinogenesis, The Netherlands Cancer Institute, 1006 Amsterdam, The Netherlands (B.E.); Department of Immunology, Genetics, and Pathology, Uppsala University, S-751 23 Uppsala, Sweden (T.D.). ; 1] Department of Genetics, Microbiology and Toxicology, Stockholm University, S-106 91 Stockholm, Sweden [2] Division of Molecular Carcinogenesis, The Netherlands Cancer Institute, 1006 Amsterdam, The Netherlands (B.E.); Department of Immunology, Genetics, and Pathology, Uppsala University, S-751 23 Uppsala, Sweden (T.D.). ; Science for Life Laboratory, RNAi Cell Screening Facility, Department of Biochemistry and Biophysics, Stockholm University, S-106 91 Stockholm, Sweden.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/24695224" target="_blank"〉PubMed〈/a〉
    Keywords: Animals ; Catalytic Domain ; Cell Death/drug effects ; Cell Survival/drug effects ; Crystallization ; DNA Damage ; DNA Repair Enzymes/*antagonists & inhibitors/chemistry/metabolism ; Deoxyguanine Nucleotides/metabolism ; Enzyme Inhibitors/chemistry/pharmacokinetics/pharmacology/therapeutic use ; Female ; Humans ; Male ; Mice ; Models, Molecular ; Molecular Conformation ; Molecular Targeted Therapy ; Neoplasms/*drug therapy/*metabolism/pathology ; Nucleotides/*metabolism ; Oxidation-Reduction/drug effects ; Phosphoric Monoester Hydrolases/*antagonists & inhibitors/chemistry/metabolism ; Pyrimidines/chemistry/pharmacokinetics/pharmacology/therapeutic use ; Pyrophosphatases/antagonists & inhibitors ; Reproducibility of Results ; Xenograft Model Antitumor Assays
    Print ISSN: 0028-0836
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  • 2
    Publication Date: 2011-02-05
    Description: X-ray crystallography provides the vast majority of macromolecular structures, but the success of the method relies on growing crystals of sufficient size. In conventional measurements, the necessary increase in X-ray dose to record data from crystals that are too small leads to extensive damage before a diffraction signal can be recorded. It is particularly challenging to obtain large, well-diffracting crystals of membrane proteins, for which fewer than 300 unique structures have been determined despite their importance in all living cells. Here we present a method for structure determination where single-crystal X-ray diffraction 'snapshots' are collected from a fully hydrated stream of nanocrystals using femtosecond pulses from a hard-X-ray free-electron laser, the Linac Coherent Light Source. We prove this concept with nanocrystals of photosystem I, one of the largest membrane protein complexes. More than 3,000,000 diffraction patterns were collected in this study, and a three-dimensional data set was assembled from individual photosystem I nanocrystals ( approximately 200 nm to 2 mum in size). We mitigate the problem of radiation damage in crystallography by using pulses briefer than the timescale of most damage processes. This offers a new approach to structure determination of macromolecules that do not yield crystals of sufficient size for studies using conventional radiation sources or are particularly sensitive to radiation damage.〈br /〉〈br /〉〈a href="https://www.ncbi.nlm.nih.gov/pmc/articles/PMC3429598/" 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/PMC3429598/" target="_blank"〉This paper as free author manuscript - peer-reviewed and accepted for publication〈/a〉〈br /〉〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Chapman, Henry N -- Fromme, Petra -- Barty, Anton -- White, Thomas A -- Kirian, Richard A -- Aquila, Andrew -- Hunter, Mark S -- Schulz, Joachim -- DePonte, Daniel P -- Weierstall, Uwe -- Doak, R Bruce -- Maia, Filipe R N C -- Martin, Andrew V -- Schlichting, Ilme -- Lomb, Lukas -- Coppola, Nicola -- Shoeman, Robert L -- Epp, Sascha W -- Hartmann, Robert -- Rolles, Daniel -- Rudenko, Artem -- Foucar, Lutz -- Kimmel, Nils -- Weidenspointner, Georg -- Holl, Peter -- Liang, Mengning -- Barthelmess, Miriam -- Caleman, Carl -- Boutet, Sebastien -- Bogan, Michael J -- Krzywinski, Jacek -- Bostedt, Christoph -- Bajt, Sasa -- Gumprecht, Lars -- Rudek, Benedikt -- Erk, Benjamin -- Schmidt, Carlo -- Homke, Andre -- Reich, Christian -- Pietschner, Daniel -- Struder, Lothar -- Hauser, Gunter -- Gorke, Hubert -- Ullrich, Joachim -- Herrmann, Sven -- Schaller, Gerhard -- Schopper, Florian -- Soltau, Heike -- Kuhnel, Kai-Uwe -- Messerschmidt, Marc -- Bozek, John D -- Hau-Riege, Stefan P -- Frank, Matthias -- Hampton, Christina Y -- Sierra, Raymond G -- Starodub, Dmitri -- Williams, Garth J -- Hajdu, Janos -- Timneanu, Nicusor -- Seibert, M Marvin -- Andreasson, Jakob -- Rocker, Andrea -- Jonsson, Olof -- Svenda, Martin -- Stern, Stephan -- Nass, Karol -- Andritschke, Robert -- Schroter, Claus-Dieter -- Krasniqi, Faton -- Bott, Mario -- Schmidt, Kevin E -- Wang, Xiaoyu -- Grotjohann, Ingo -- Holton, James M -- Barends, Thomas R M -- Neutze, Richard -- Marchesini, Stefano -- Fromme, Raimund -- Schorb, Sebastian -- Rupp, Daniela -- Adolph, Marcus -- Gorkhover, Tais -- Andersson, Inger -- Hirsemann, Helmut -- Potdevin, Guillaume -- Graafsma, Heinz -- Nilsson, Bjorn -- Spence, John C H -- 1R01GM095583-01/GM/NIGMS NIH HHS/ -- 1U54GM094625-01/GM/NIGMS NIH HHS/ -- R01 GM095583/GM/NIGMS NIH HHS/ -- U54 GM094599/GM/NIGMS NIH HHS/ -- U54 GM094625/GM/NIGMS NIH HHS/ -- England -- Nature. 2011 Feb 3;470(7332):73-7. doi: 10.1038/nature09750.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Center for Free-Electron Laser Science, DESY, Notkestrasse 85, 22607 Hamburg, Germany. henry.chapman@desy.de〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/21293373" target="_blank"〉PubMed〈/a〉
    Keywords: Crystallography, X-Ray/instrumentation/*methods ; Lasers ; Models, Molecular ; Nanoparticles/*chemistry ; Nanotechnology/instrumentation/*methods ; Photosystem I Protein Complex/*chemistry ; Protein Conformation ; Time Factors ; X-Rays
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  • 3
    Publication Date: 2013-11-15
    Description: Glucose homeostasis is a vital and complex process, and its disruption can cause hyperglycaemia and type II diabetes mellitus. Glucokinase (GK), a key enzyme that regulates glucose homeostasis, converts glucose to glucose-6-phosphate in pancreatic beta-cells, liver hepatocytes, specific hypothalamic neurons, and gut enterocytes. In hepatocytes, GK regulates glucose uptake and glycogen synthesis, suppresses glucose production, and is subject to the endogenous inhibitor GK regulatory protein (GKRP). During fasting, GKRP binds, inactivates and sequesters GK in the nucleus, which removes GK from the gluconeogenic process and prevents a futile cycle of glucose phosphorylation. Compounds that directly hyperactivate GK (GK activators) lower blood glucose levels and are being evaluated clinically as potential therapeutics for the treatment of type II diabetes mellitus. However, initial reports indicate that an increased risk of hypoglycaemia is associated with some GK activators. To mitigate the risk of hypoglycaemia, we sought to increase GK activity by blocking GKRP. Here we describe the identification of two potent small-molecule GK-GKRP disruptors (AMG-1694 and AMG-3969) that normalized blood glucose levels in several rodent models of diabetes. These compounds potently reversed the inhibitory effect of GKRP on GK activity and promoted GK translocation both in vitro (isolated hepatocytes) and in vivo (liver). A co-crystal structure of full-length human GKRP in complex with AMG-1694 revealed a previously unknown binding pocket in GKRP distinct from that of the phosphofructose-binding site. Furthermore, with AMG-1694 and AMG-3969 (but not GK activators), blood glucose lowering was restricted to diabetic and not normoglycaemic animals. These findings exploit a new cellular mechanism for lowering blood glucose levels with reduced potential for hypoglycaemic risk in patients with type II diabetes mellitus.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Lloyd, David J -- St Jean, David J Jr -- Kurzeja, Robert J M -- Wahl, Robert C -- Michelsen, Klaus -- Cupples, Rod -- Chen, Michelle -- Wu, John -- Sivits, Glenn -- Helmering, Joan -- Komorowski, Renee -- Ashton, Kate S -- Pennington, Lewis D -- Fotsch, Christopher -- Vazir, Mukta -- Chen, Kui -- Chmait, Samer -- Zhang, Jiandong -- Liu, Longbin -- Norman, Mark H -- Andrews, Kristin L -- Bartberger, Michael D -- Van, Gwyneth -- Galbreath, Elizabeth J -- Vonderfecht, Steven L -- Wang, Minghan -- Jordan, Steven R -- Veniant, Murielle M -- Hale, Clarence -- England -- Nature. 2013 Dec 19;504(7480):437-40. doi: 10.1038/nature12724. Epub 2013 Nov 13.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Department of Metabolic Disorders, Amgen Inc., One Amgen Center Drive, Thousand Oaks, California 91320, USA. ; Department of Therapeutic Discovery, Amgen Inc., One Amgen Center Drive, Thousand Oaks, California 91320, USA. ; Department of Comparative Biology & Safety Sciences, Amgen Inc., One Amgen Center Drive, Thousand Oaks, California 91320, USA.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/24226772" target="_blank"〉PubMed〈/a〉
    Keywords: Adaptor Proteins, Signal Transducing ; Animals ; Blood Glucose/metabolism ; Carrier Proteins/*antagonists & inhibitors/metabolism ; Cell Nucleus/enzymology ; Crystallography, X-Ray ; Diabetes Mellitus, Type 2/blood/*drug therapy/enzymology ; Disease Models, Animal ; Hepatocytes ; Humans ; Hyperglycemia/blood/drug therapy/enzymology ; Hypoglycemic Agents/chemistry/*pharmacology/*therapeutic use ; Liver/cytology/enzymology/metabolism ; Male ; Models, Molecular ; Organ Specificity ; Phosphorylation/drug effects ; Piperazines/chemistry/metabolism/pharmacology/therapeutic use ; Protein Binding/drug effects ; Protein Transport/drug effects ; Rats ; Rats, Wistar ; Sulfonamides/chemistry/metabolism/pharmacology/therapeutic use
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  • 4
    Publication Date: 2013-11-29
    Description: Achieving the goal of malaria elimination will depend on targeting Plasmodium pathways essential across all life stages. Here we identify a lipid kinase, phosphatidylinositol-4-OH kinase (PI(4)K), as the target of imidazopyrazines, a new antimalarial compound class that inhibits the intracellular development of multiple Plasmodium species at each stage of infection in the vertebrate host. Imidazopyrazines demonstrate potent preventive, therapeutic, and transmission-blocking activity in rodent malaria models, are active against blood-stage field isolates of the major human pathogens P. falciparum and P. vivax, and inhibit liver-stage hypnozoites in the simian parasite P. cynomolgi. We show that imidazopyrazines exert their effect through inhibitory interaction with the ATP-binding pocket of PI(4)K, altering the intracellular distribution of phosphatidylinositol-4-phosphate. Collectively, our data define PI(4)K as a key Plasmodium vulnerability, opening up new avenues of target-based discovery to identify drugs with an ideal activity profile for the prevention, treatment and elimination of malaria.〈br /〉〈br /〉〈a href="https://www.ncbi.nlm.nih.gov/pmc/articles/PMC3940870/" 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/PMC3940870/" target="_blank"〉This paper as free author manuscript - peer-reviewed and accepted for publication〈/a〉〈br /〉〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉McNamara, Case W -- Lee, Marcus C S -- Lim, Chek Shik -- Lim, Siau Hoi -- Roland, Jason -- Nagle, Advait -- Simon, Oliver -- Yeung, Bryan K S -- Chatterjee, Arnab K -- McCormack, Susan L -- Manary, Micah J -- Zeeman, Anne-Marie -- Dechering, Koen J -- Kumar, T R Santha -- Henrich, Philipp P -- Gagaring, Kerstin -- Ibanez, Maureen -- Kato, Nobutaka -- Kuhen, Kelli L -- Fischli, Christoph -- Rottmann, Matthias -- Plouffe, David M -- Bursulaya, Badry -- Meister, Stephan -- Rameh, Lucia -- Trappe, Joerg -- Haasen, Dorothea -- Timmerman, Martijn -- Sauerwein, Robert W -- Suwanarusk, Rossarin -- Russell, Bruce -- Renia, Laurent -- Nosten, Francois -- Tully, David C -- Kocken, Clemens H M -- Glynne, Richard J -- Bodenreider, Christophe -- Fidock, David A -- Diagana, Thierry T -- Winzeler, Elizabeth A -- 078285/Wellcome Trust/United Kingdom -- 089275/Wellcome Trust/United Kingdom -- 090534/Wellcome Trust/United Kingdom -- 096157/Wellcome Trust/United Kingdom -- R01 AI079709/AI/NIAID NIH HHS/ -- R01 AI085584/AI/NIAID NIH HHS/ -- R01 AI090141/AI/NIAID NIH HHS/ -- R01 AI103058/AI/NIAID NIH HHS/ -- R01079709/PHS HHS/ -- R01085584/PHS HHS/ -- R01AI090141/AI/NIAID NIH HHS/ -- WT078285/Wellcome Trust/United Kingdom -- WT096157/Wellcome Trust/United Kingdom -- England -- Nature. 2013 Dec 12;504(7479):248-53. doi: 10.1038/nature12782. Epub 2013 Nov 27.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉1] Genomics Institute of the Novartis Research Foundation, San Diego, California 92121, USA [2]. ; 1] Department of Microbiology & Immunology, Columbia University Medical Center, New York, New York 10032, USA [2]. ; Novartis Institutes for Tropical Disease, 138670 Singapore. ; Genomics Institute of the Novartis Research Foundation, San Diego, California 92121, USA. ; Department of Pediatrics, School of Medicine, University of California, San Diego, La Jolla, California 92093, USA. ; Department of Parasitology, Biomedical Primate Research Centre, PO Box 3306, 2280 GH Rijswijk, The Netherlands. ; TropIQ Health Sciences, 6525 GA Nijmegen, The Netherlands. ; Department of Microbiology & Immunology, Columbia University Medical Center, New York, New York 10032, USA. ; Swiss Tropical and Public Health Institute, CH-4002 Basel, Switzerland. ; 1] Swiss Tropical and Public Health Institute, CH-4002 Basel, Switzerland [2] University of Basel, CH-4003 Basel, Switzerland. ; Department of Medicine, School of Medicine, Boston University, Boston, Massachusetts 02118, USA. ; Novartis Institutes for BioMedical Research, CH-4002 Basel, Switzerland. ; 1] TropIQ Health Sciences, 6525 GA Nijmegen, The Netherlands [2] Department of Medical Microbiology, Radboud University, Nijmegen Medical CentrePO Box 9101, 6500 HB Nijmegen, The Netherlands. ; Laboratory of Malaria Immunobiology, Singapore Immunology Network, Agency for Science Technology and Research (A*STAR), Biopolis, 138648 Singapore. ; 1] Laboratory of Malaria Immunobiology, Singapore Immunology Network, Agency for Science Technology and Research (A*STAR), Biopolis, 138648 Singapore [2] Department of Microbiology, Yong Loo Lin School of Medicine, National University of Singapore, National University Health System, 117545 Singapore. ; 1] Centre for Tropical Medicine, Nuffield Department of Medicine, University of Oxford, Oxford OX3 7BN, UK [2] Shoklo Malaria Research Unit, Mahidol-Oxford Tropical Medicine Research Unit, Faculty of Tropical Medicine, Mahidol University, Mae Sot 63110, Thailand. ; 1] Department of Microbiology & Immunology, Columbia University Medical Center, New York, New York 10032, USA [2] Division of Infectious Diseases, Department of Medicine, Columbia University Medical Center, New York, New York 10032, USA. ; 1] Genomics Institute of the Novartis Research Foundation, San Diego, California 92121, USA [2] Department of Pediatrics, School of Medicine, University of California, San Diego, La Jolla, California 92093, USA.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/24284631" target="_blank"〉PubMed〈/a〉
    Keywords: 1-Phosphatidylinositol 4-Kinase/*antagonists & ; inhibitors/chemistry/genetics/metabolism ; Adenosine Triphosphate/metabolism ; Animals ; Binding Sites ; Cytokinesis/drug effects ; Drug Resistance/drug effects/genetics ; Fatty Acids/metabolism ; Female ; Hepatocytes/parasitology ; Humans ; Imidazoles/metabolism/pharmacology ; Life Cycle Stages/drug effects ; Macaca mulatta ; Malaria/*drug therapy/*parasitology ; Male ; Models, Biological ; Models, Molecular ; Phosphatidylinositol Phosphates/metabolism ; Plasmodium/classification/*drug effects/*enzymology/growth & development ; Pyrazoles/metabolism/pharmacology ; Quinoxalines/metabolism/pharmacology ; Reproducibility of Results ; Schizonts/cytology/drug effects ; rab GTP-Binding Proteins/genetics/metabolism
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  • 5
    Publication Date: 2011-03-25
    Description: Multiple myeloma is an incurable malignancy of plasma cells, and its pathogenesis is poorly understood. Here we report the massively parallel sequencing of 38 tumour genomes and their comparison to matched normal DNAs. Several new and unexpected oncogenic mechanisms were suggested by the pattern of somatic mutation across the data set. These include the mutation of genes involved in protein translation (seen in nearly half of the patients), genes involved in histone methylation, and genes involved in blood coagulation. In addition, a broader than anticipated role of NF-kappaB signalling was indicated by mutations in 11 members of the NF-kappaB pathway. Of potential immediate clinical relevance, activating mutations of the kinase BRAF were observed in 4% of patients, suggesting the evaluation of BRAF inhibitors in multiple myeloma clinical trials. These results indicate that cancer genome sequencing of large collections of samples will yield new insights into cancer not anticipated by existing knowledge.〈br /〉〈br /〉〈a href="https://www.ncbi.nlm.nih.gov/pmc/articles/PMC3560292/" 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/PMC3560292/" target="_blank"〉This paper as free author manuscript - peer-reviewed and accepted for publication〈/a〉〈br /〉〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Chapman, Michael A -- Lawrence, Michael S -- Keats, Jonathan J -- Cibulskis, Kristian -- Sougnez, Carrie -- Schinzel, Anna C -- Harview, Christina L -- Brunet, Jean-Philippe -- Ahmann, Gregory J -- Adli, Mazhar -- Anderson, Kenneth C -- Ardlie, Kristin G -- Auclair, Daniel -- Baker, Angela -- Bergsagel, P Leif -- Bernstein, Bradley E -- Drier, Yotam -- Fonseca, Rafael -- Gabriel, Stacey B -- Hofmeister, Craig C -- Jagannath, Sundar -- Jakubowiak, Andrzej J -- Krishnan, Amrita -- Levy, Joan -- Liefeld, Ted -- Lonial, Sagar -- Mahan, Scott -- Mfuko, Bunmi -- Monti, Stefano -- Perkins, Louise M -- Onofrio, Robb -- Pugh, Trevor J -- Rajkumar, S Vincent -- Ramos, Alex H -- Siegel, David S -- Sivachenko, Andrey -- Stewart, A Keith -- Trudel, Suzanne -- Vij, Ravi -- Voet, Douglas -- Winckler, Wendy -- Zimmerman, Todd -- Carpten, John -- Trent, Jeff -- Hahn, William C -- Garraway, Levi A -- Meyerson, Matthew -- Lander, Eric S -- Getz, Gad -- Golub, Todd R -- K12 CA133250/CA/NCI NIH HHS/ -- R01 AG020686/AG/NIA NIH HHS/ -- R01 AG020686-07/AG/NIA NIH HHS/ -- R01 CA133115/CA/NCI NIH HHS/ -- R01 CA133115-04/CA/NCI NIH HHS/ -- R01 CA133966/CA/NCI NIH HHS/ -- R01 CA133966-03/CA/NCI NIH HHS/ -- England -- Nature. 2011 Mar 24;471(7339):467-72. doi: 10.1038/nature09837.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉The Eli and Edythe L. Broad Institute, 7 Cambridge Center, Cambridge, Massachusetts 02412, USA.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/21430775" target="_blank"〉PubMed〈/a〉
    Keywords: Amino Acid Sequence ; Blood Coagulation/genetics ; CpG Islands/genetics ; DNA Mutational Analysis ; DNA Repair/genetics ; Exons/genetics ; Exosome Multienzyme Ribonuclease Complex ; Genome, Human/*genetics ; Genomics ; Histones/metabolism ; Homeodomain Proteins/genetics ; Homeostasis/genetics ; Humans ; Methylation ; Models, Molecular ; Molecular Sequence Data ; Multiple Myeloma/drug therapy/enzymology/*genetics/metabolism ; Mutation/*genetics ; NF-kappa B/metabolism ; Oncogenes/genetics ; Open Reading Frames/genetics ; Protein Biosynthesis/genetics ; Protein Conformation ; Proto-Oncogene Proteins B-raf/antagonists & inhibitors/genetics/metabolism ; RNA Processing, Post-Transcriptional/genetics ; Ribonucleases/chemistry/genetics ; Signal Transduction/genetics ; Transcription, Genetic/genetics
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  • 6
    Publication Date: 2012-10-12
    Description: Antigen-presenting molecules, encoded by the major histocompatibility complex (MHC) and CD1 family, bind peptide- and lipid-based antigens, respectively, for recognition by T cells. Mucosal-associated invariant T (MAIT) cells are an abundant population of innate-like T cells in humans that are activated by an antigen(s) bound to the MHC class I-like molecule MR1. Although the identity of MR1-restricted antigen(s) is unknown, it is present in numerous bacteria and yeast. Here we show that the structure and chemistry within the antigen-binding cleft of MR1 is distinct from the MHC and CD1 families. MR1 is ideally suited to bind ligands originating from vitamin metabolites. The structure of MR1 in complex with 6-formyl pterin, a folic acid (vitamin B9) metabolite, shows the pterin ring sequestered within MR1. Furthermore, we characterize related MR1-restricted vitamin derivatives, originating from the bacterial riboflavin (vitamin B2) biosynthetic pathway, which specifically and potently activate MAIT cells. Accordingly, we show that metabolites of vitamin B represent a class of antigen that are presented by MR1 for MAIT-cell immunosurveillance. As many vitamin biosynthetic pathways are unique to bacteria and yeast, our data suggest that MAIT cells use these metabolites to detect microbial infection.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Kjer-Nielsen, Lars -- Patel, Onisha -- Corbett, Alexandra J -- Le Nours, Jerome -- Meehan, Bronwyn -- Liu, Ligong -- Bhati, Mugdha -- Chen, Zhenjun -- Kostenko, Lyudmila -- Reantragoon, Rangsima -- Williamson, Nicholas A -- Purcell, Anthony W -- Dudek, Nadine L -- McConville, Malcolm J -- O'Hair, Richard A J -- Khairallah, George N -- Godfrey, Dale I -- Fairlie, David P -- Rossjohn, Jamie -- McCluskey, James -- England -- Nature. 2012 Nov 29;491(7426):717-23. doi: 10.1038/nature11605. Epub 2012 Oct 10.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Department of Microbiology & Immunology, University of Melbourne, Parkville, Victoria 3010, Australia.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/23051753" target="_blank"〉PubMed〈/a〉
    Keywords: Antigen Presentation ; Bacterial Infections/immunology/microbiology ; Binding Sites ; Cell Line ; Crystallography, X-Ray ; Folic Acid/chemistry/immunology/*metabolism ; Histocompatibility Antigens/chemistry/immunology ; Histocompatibility Antigens Class I/*chemistry/*immunology/metabolism ; Humans ; Immunologic Surveillance/immunology ; Jurkat Cells ; Ligands ; Lymphocyte Activation ; Models, Molecular ; Protein Refolding/drug effects ; Pterins/*chemistry/*immunology/metabolism/pharmacology ; Salmonella/immunology/metabolism ; Salmonella Infections/immunology/microbiology ; Static Electricity ; T-Lymphocytes/*immunology ; beta 2-Microglobulin/immunology/metabolism
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  • 7
    Publication Date: 2014-05-09
    Description: Efficient duplication of the genome requires the concerted action of helicase and DNA polymerases at replication forks to avoid stalling of the replication machinery and consequent genomic instability. In eukaryotes, the physical coupling between helicase and DNA polymerases remains poorly understood. Here we define the molecular mechanism by which the yeast Ctf4 protein links the Cdc45-MCM-GINS (CMG) DNA helicase to DNA polymerase alpha (Pol alpha) within the replisome. We use X-ray crystallography and electron microscopy to show that Ctf4 self-associates in a constitutive disk-shaped trimer. Trimerization depends on a beta-propeller domain in the carboxy-terminal half of the protein, which is fused to a helical extension that protrudes from one face of the trimeric disk. Critically, Pol alpha and the CMG helicase share a common mechanism of interaction with Ctf4. We show that the amino-terminal tails of the catalytic subunit of Pol alpha and the Sld5 subunit of GINS contain a conserved Ctf4-binding motif that docks onto the exposed helical extension of a Ctf4 protomer within the trimer. Accordingly, we demonstrate that one Ctf4 trimer can support binding of up to three partner proteins, including the simultaneous association with both Pol alpha and GINS. Our findings indicate that Ctf4 can couple two molecules of Pol alpha to one CMG helicase within the replisome, providing a new model for lagging-strand synthesis in eukaryotes that resembles the emerging model for the simpler replisome of Escherichia coli. The ability of Ctf4 to act as a platform for multivalent interactions illustrates a mechanism for the concurrent recruitment of factors that act together at the fork.〈br /〉〈br /〉〈a href="https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4059944/" 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/PMC4059944/" target="_blank"〉This paper as free author manuscript - peer-reviewed and accepted for publication〈/a〉〈br /〉〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Simon, Aline C -- Zhou, Jin C -- Perera, Rajika L -- van Deursen, Frederick -- Evrin, Cecile -- Ivanova, Marina E -- Kilkenny, Mairi L -- Renault, Ludovic -- Kjaer, Svend -- Matak-Vinkovic, Dijana -- Labib, Karim -- Costa, Alessandro -- Pellegrini, Luca -- 084279/Wellcome Trust/United Kingdom -- Wellcome Trust/United Kingdom -- Medical Research Council/United Kingdom -- England -- Nature. 2014 Jun 12;510(7504):293-7. doi: 10.1038/nature13234. Epub 2014 May 4.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉1] Department of Biochemistry, University of Cambridge, Cambridge CB2 1GA, UK [2]. ; 1] Clare Hall Laboratories, Cancer Research UK London Research Institute, London EN6 3LD, UK [2]. ; 1] Department of Biochemistry, University of Cambridge, Cambridge CB2 1GA, UK [2] Imperial College, South Kensington, London SW7 2AZ, UK (R.L.P.); Cancer Research UK London Research Institute, London WC2A 3LY, UK (M.E.I.). ; Cancer Research UK Manchester Institute, University of Manchester, Manchester M20 4BX, UK. ; MRC Protein Phosphorylation and Ubiquitylation Unit, College of Life Sciences, University of Dundee, Dundee DD1 5EH, UK. ; Department of Biochemistry, University of Cambridge, Cambridge CB2 1GA, UK. ; Clare Hall Laboratories, Cancer Research UK London Research Institute, London EN6 3LD, UK. ; Protein purification, Cancer Research UK London Research Institute, London WC2A 3LY, UK. ; Department of Chemistry, University of Cambridge, Cambridge CB2 1EW, UK.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/24805245" target="_blank"〉PubMed〈/a〉
    Keywords: Amino Acid Motifs ; Amino Acid Sequence ; Catalytic Domain ; Conserved Sequence ; Crystallography, X-Ray ; DNA Helicases/chemistry/*metabolism/ultrastructure ; DNA Polymerase I/chemistry/*metabolism/ultrastructure ; *DNA Replication ; DNA-Binding Proteins/*chemistry/*metabolism/ultrastructure ; DNA-Directed DNA Polymerase/*chemistry/*metabolism ; Microscopy, Electron ; Minichromosome Maintenance Proteins/chemistry/metabolism ; Models, Molecular ; Molecular Sequence Data ; Multienzyme Complexes/*chemistry/*metabolism ; Nuclear Proteins/chemistry/metabolism ; Protein Binding ; *Protein Multimerization ; Protein Structure, Quaternary ; Protein Subunits/chemistry/metabolism ; Saccharomyces cerevisiae/*chemistry/ultrastructure ; Saccharomyces cerevisiae Proteins/*chemistry/*metabolism/ultrastructure
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  • 8
    Publication Date: 2014-10-09
    Description: The neutralizing antibody response to influenza virus is dominated by antibodies that bind to the globular head of haemagglutinin, which undergoes a continuous antigenic drift, necessitating the re-formulation of influenza vaccines on an annual basis. Recently, several laboratories have described a new class of rare influenza-neutralizing antibodies that target a conserved site in the haemagglutinin stem. Most of these antibodies use the heavy-chain variable region VH1-69 gene, and structural data demonstrate that they bind to the haemagglutinin stem through conserved heavy-chain complementarity determining region (HCDR) residues. However, the VH1-69 antibodies are highly mutated and are produced by some but not all individuals, suggesting that several somatic mutations may be required for their development. To address this, here we characterize 197 anti-stem antibodies from a single donor, reconstruct the developmental pathways of several VH1-69 clones and identify two key elements that are required for the initial development of most VH1-69 antibodies: a polymorphic germline-encoded phenylalanine at position 54 and a conserved tyrosine at position 98 in HCDR3. Strikingly, in most cases a single proline to alanine mutation at position 52a in HCDR2 is sufficient to confer high affinity binding to the selecting H1 antigen, consistent with rapid affinity maturation. Surprisingly, additional favourable mutations continue to accumulate, increasing the breadth of reactivity and making both the initial mutations and phenylalanine at position 54 functionally redundant. These results define VH1-69 allele polymorphism, rearrangement of the VDJ gene segments and single somatic mutations as the three requirements for generating broadly neutralizing VH1-69 antibodies and reveal an unexpected redundancy in the affinity maturation process.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Pappas, Leontios -- Foglierini, Mathilde -- Piccoli, Luca -- Kallewaard, Nicole L -- Turrini, Filippo -- Silacci, Chiara -- Fernandez-Rodriguez, Blanca -- Agatic, Gloria -- Giacchetto-Sasselli, Isabella -- Pellicciotta, Gabriele -- Sallusto, Federica -- Zhu, Qing -- Vicenzi, Elisa -- Corti, Davide -- Lanzavecchia, Antonio -- U19 AI-057266/AI/NIAID NIH HHS/ -- England -- Nature. 2014 Dec 18;516(7531):418-22. doi: 10.1038/nature13764. Epub 2014 Oct 5.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Insitute for Research in Biomedicine, Universita della Svizzera Italiana, Via Vincenzo Vela 6, 6500 Bellinzona, Switzerland. ; Department of Infectious Diseases and Vaccines MedImmune LLC, One MedImmune Way, Gaithersburg, Maryland 20878, USA. ; Viral Pathogens and Biosafety Unit, San Raffaele Scientific Institute, Via Olgettina 58, 20132 Milan, Italy. ; Humabs BioMed SA, Via Mirasole 1, 6500 Bellinzona, Switzerland. ; Unit of Preventive Medicine, San Raffaele Scientific Institute, Via Olgettina 58, 20132 Milan, Italy. ; 1] Insitute for Research in Biomedicine, Universita della Svizzera Italiana, Via Vincenzo Vela 6, 6500 Bellinzona, Switzerland [2] Humabs BioMed SA, Via Mirasole 1, 6500 Bellinzona, Switzerland [3]. ; 1] Insitute for Research in Biomedicine, Universita della Svizzera Italiana, Via Vincenzo Vela 6, 6500 Bellinzona, Switzerland [2] Insitute for Microbiology, ETH Zurich, Wolfgang-Pauli-Strasse 10, 8093 Zurich, Switzerland [3].〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/25296253" target="_blank"〉PubMed〈/a〉
    Keywords: Adult ; Amino Acid Sequence ; Antibodies, Neutralizing/*genetics ; Cells, Cultured ; Complementarity Determining Regions/chemistry/*genetics ; Female ; Hemagglutinin Glycoproteins, Influenza Virus/immunology ; Humans ; Immunoglobulin Heavy Chains/genetics ; Influenza, Human/*immunology/virology ; Male ; Middle Aged ; Models, Molecular ; Mutation/*genetics ; Orthomyxoviridae/*immunology/metabolism ; Polymorphism, Genetic ; Protein Binding/genetics ; Protein Structure, Tertiary ; Young Adult
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  • 9
    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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  • 10
    Publication Date: 2014-09-05
    Description: SWEETs and their prokaryotic homologues are monosaccharide and disaccharide transporters that are present from Archaea to plants and humans. SWEETs play crucial roles in cellular sugar efflux processes: that is, in phloem loading, pollen nutrition and nectar secretion. Their bacterial homologues, which are called SemiSWEETs, are among the smallest known transporters. Here we show that SemiSWEET molecules, which consist of a triple-helix bundle, form symmetrical, parallel dimers, thereby generating the translocation pathway. Two SemiSWEET isoforms were crystallized, one in an apparently open state and one in an occluded state, indicating that SemiSWEETs and SWEETs are transporters that undergo rocking-type movements during the transport cycle. The topology of the triple-helix bundle is similar yet distinct to that of the basic building block of animal and plant major facilitator superfamily (MFS) transporters (for example, GLUTs and SUTs). This finding indicates two possibilities: that SWEETs and MFS transporters evolved from an ancestral triple-helix bundle or that the triple-helix bundle represents convergent evolution. In SemiSWEETs and SWEETs, two triple-helix bundles are arranged in a parallel configuration to produce the 6- and 6 + 1-transmembrane-helix pores, respectively. In the 12-transmembrane-helix MFS transporters, four triple-helix bundles are arranged into an alternating antiparallel configuration, resulting in a much larger 2 x 2 triple-helix bundle forming the pore. Given the similarity of SemiSWEETs and SWEETs to PQ-loop amino acid transporters and to mitochondrial pyruvate carriers (MPCs), the structures characterized here may also be relevant to other transporters in the MtN3 clan. The insight gained from the structures of these transporters and from the analysis of mutations of conserved residues will improve the understanding of the transport mechanism, as well as allow comparative studies of the different superfamilies involved in sugar transport and the evolution of transporters in general.〈br /〉〈br /〉〈a href="https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4300204/" 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/PMC4300204/" target="_blank"〉This paper as free author manuscript - peer-reviewed and accepted for publication〈/a〉〈br /〉〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Xu, Yan -- Tao, Yuyong -- Cheung, Lily S -- Fan, Chao -- Chen, Li-Qing -- Xu, Sophia -- Perry, Kay -- Frommer, Wolf B -- Feng, Liang -- P41 GM103403/GM/NIGMS NIH HHS/ -- England -- Nature. 2014 Nov 20;515(7527):448-52. doi: 10.1038/nature13670. Epub 2014 Sep 3.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉1] Department of Molecular and Cellular Physiology, 279 Campus Drive, Stanford University School of Medicine, Stanford, California 94305, USA [2]. ; 1] Department of Plant Biology, Carnegie Institution for Science, 260 Panama Street, Stanford, California 94305, USA [2]. ; Department of Molecular and Cellular Physiology, 279 Campus Drive, Stanford University School of Medicine, Stanford, California 94305, USA. ; Department of Plant Biology, Carnegie Institution for Science, 260 Panama Street, Stanford, California 94305, USA. ; Department of Biology, Stanford University, Stanford, California 94305, USA. ; NE-CAT and Department of Chemistry and Chemical Biology, Cornell University, Building 436E, Argonne National Laboratory, 9700 South Cass Avenue, Argonne, Illinois 60439, USA. ; 1] Department of Plant Biology, Carnegie Institution for Science, 260 Panama Street, Stanford, California 94305, USA [2] Department of Biology, Stanford University, Stanford, California 94305, USA.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/25186729" target="_blank"〉PubMed〈/a〉
    Keywords: Arabidopsis/chemistry ; Bacterial Proteins/*chemistry/metabolism ; Crystallography, X-Ray ; Evolution, Molecular ; Glucose/metabolism ; Leptospira/*chemistry/genetics ; Models, Molecular ; Monosaccharide Transport Proteins/*chemistry/genetics/metabolism ; Movement ; Protein Conformation ; Protein Multimerization ; Structure-Activity Relationship ; Vibrio/*chemistry
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