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  • 1
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    Company matters: The presence of other genotypes alters traits and intraspecific selection in an Arctic diatom under climate change (2019)
    Wiley
    Details
    Publication Date: 2019
    Description: Abstract Arctic phytoplankton and their response to future conditions shape one of the most rapidly changing ecosystems on the planet. We tested how much the phenotypic responses of strains from an Arctic diatom population diverge and whether the physiology and intraspecific composition of multi‐strain populations differ from expectations based on single strain traits. To this end, we conducted incubation experiments with the diatom Thalassiosira hyalina under present‐day and future temperature and pCO2 treatments. Six fresh isolates from the same Svalbard population were incubated as mono‐ and multi‐strain cultures. For the first time, we were able to closely follow intraspecific selection within an artificial population using microsatellites and allele‐specific quantitative PCR. Our results show not only that there is substantial variation in how strains of the same species cope with the tested environments, but also that changes in genotype composition, production rates and cellular quotas in the multi‐strain cultures are not predictable from monoculture performance. Nevertheless, the physiological responses as well as strain composition of the artificial populations were highly reproducible within each environment. Interestingly, we only detected significant strain sorting in those populations exposed to the future treatment. This study illustrates that the genetic composition of populations can change on very short timescales through selection from the intraspecific standing stock, indicating the potential for rapid population level adaptation to climate change. We further show that individuals adjust their phenotype not only in response to their physico‐chemical, but also to their biological surroundings. Such intraspecific interactions need to be understood in order to realistically predict ecosystem responses to global change. This article is protected by copyright. All rights reserved.
    Print ISSN: 1354-1013
    Electronic ISSN: 1365-2486
    Topics: Biology , Energy, Environment Protection, Nuclear Power Engineering , Geography
    Published by Wiley
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  • 2
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    Homologue structure of the SLAC1 anion channel for closing stomata in leaves (2010)
    Nature Publishing Group (NPG)
    Details
    Publication Date: 2010-10-29
    Description: The plant SLAC1 anion channel controls turgor pressure in the aperture-defining guard cells of plant stomata, thereby regulating the exchange of water vapour and photosynthetic gases in response to environmental signals such as drought or high levels of carbon dioxide. Here we determine the crystal structure of a bacterial homologue (Haemophilus influenzae) of SLAC1 at 1.20 A resolution, and use structure-inspired mutagenesis to analyse the conductance properties of SLAC1 channels. SLAC1 is a symmetrical trimer composed from quasi-symmetrical subunits, each having ten transmembrane helices arranged from helical hairpin pairs to form a central five-helix transmembrane pore that is gated by an extremely conserved phenylalanine residue. Conformational features indicate a mechanism for control of gating by kinase activation, and electrostatic features of the pore coupled with electrophysiological characteristics indicate that selectivity among different anions is largely a function of the energetic cost of ion dehydration.〈br /〉〈br /〉〈a href="https://www.ncbi.nlm.nih.gov/pmc/articles/PMC3548404/" 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/PMC3548404/" target="_blank"〉This paper as free author manuscript - peer-reviewed and accepted for publication〈/a〉〈br /〉〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Chen, Yu-Hang -- Hu, Lei -- Punta, Marco -- Bruni, Renato -- Hillerich, Brandan -- Kloss, Brian -- Rost, Burkhard -- Love, James -- Siegelbaum, Steven A -- Hendrickson, Wayne A -- R01 GM034102/GM/NIGMS NIH HHS/ -- U54 GM075026/GM/NIGMS NIH HHS/ -- U54 GM095315/GM/NIGMS NIH HHS/ -- England -- Nature. 2010 Oct 28;467(7319):1074-80. doi: 10.1038/nature09487.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Department of Biochemistry and Molecular Biophysics, 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/20981093" target="_blank"〉PubMed〈/a〉
    Keywords: Amino Acid Sequence ; Animals ; Arabidopsis/genetics/metabolism ; Arabidopsis Proteins/*chemistry ; Bacterial Proteins/*chemistry/genetics/metabolism ; Crystallography, X-Ray ; Electric Conductivity ; Haemophilus influenzae/*chemistry/genetics ; Ion Channel Gating ; Membrane Proteins/*chemistry ; Models, Molecular ; Molecular Sequence Data ; Oocytes/metabolism ; Phenylalanine/chemistry/metabolism ; Plant Stomata/*metabolism ; Static Electricity ; *Structural Homology, Protein ; Substrate Specificity ; Xenopus laevis
    Print ISSN: 0028-0836
    Electronic ISSN: 1476-4687
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Published by Nature Publishing Group (NPG)
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  • 3
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    The transcriptional landscape of the mammalian genome (2005)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 2005-09-06
    Description: This study describes comprehensive polling of transcription start and termination sites and analysis of previously unidentified full-length complementary DNAs derived from the mouse genome. We identify the 5' and 3' boundaries of 181,047 transcripts with extensive variation in transcripts arising from alternative promoter usage, splicing, and polyadenylation. There are 16,247 new mouse protein-coding transcripts, including 5154 encoding previously unidentified proteins. Genomic mapping of the transcriptome reveals transcriptional forests, with overlapping transcription on both strands, separated by deserts in which few transcripts are observed. The data provide a comprehensive platform for the comparative analysis of mammalian transcriptional regulation in differentiation and development.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Carninci, P -- Kasukawa, T -- Katayama, S -- Gough, J -- Frith, M C -- Maeda, N -- Oyama, R -- Ravasi, T -- Lenhard, B -- Wells, C -- Kodzius, R -- Shimokawa, K -- Bajic, V B -- Brenner, S E -- Batalov, S -- Forrest, A R R -- Zavolan, M -- Davis, M J -- Wilming, L G -- Aidinis, V -- Allen, J E -- Ambesi-Impiombato, A -- Apweiler, R -- Aturaliya, R N -- Bailey, T L -- Bansal, M -- Baxter, L -- Beisel, K W -- Bersano, T -- Bono, H -- Chalk, A M -- Chiu, K P -- Choudhary, V -- Christoffels, A -- Clutterbuck, D R -- Crowe, M L -- Dalla, E -- Dalrymple, B P -- de Bono, B -- Della Gatta, G -- di Bernardo, D -- Down, T -- Engstrom, P -- Fagiolini, M -- Faulkner, G -- Fletcher, C F -- Fukushima, T -- Furuno, M -- Futaki, S -- Gariboldi, M -- Georgii-Hemming, P -- Gingeras, T R -- Gojobori, T -- Green, R E -- Gustincich, S -- Harbers, M -- Hayashi, Y -- Hensch, T K -- Hirokawa, N -- Hill, D -- Huminiecki, L -- Iacono, M -- Ikeo, K -- Iwama, A -- Ishikawa, T -- Jakt, M -- Kanapin, A -- Katoh, M -- Kawasawa, Y -- Kelso, J -- Kitamura, H -- Kitano, H -- Kollias, G -- Krishnan, S P T -- Kruger, A -- Kummerfeld, S K -- Kurochkin, I V -- Lareau, L F -- Lazarevic, D -- Lipovich, L -- Liu, J -- Liuni, S -- McWilliam, S -- Madan Babu, M -- Madera, M -- Marchionni, L -- Matsuda, H -- Matsuzawa, S -- Miki, H -- Mignone, F -- Miyake, S -- Morris, K -- Mottagui-Tabar, S -- Mulder, N -- Nakano, N -- Nakauchi, H -- Ng, P -- Nilsson, R -- Nishiguchi, S -- Nishikawa, S -- Nori, F -- Ohara, O -- Okazaki, Y -- Orlando, V -- Pang, K C -- Pavan, W J -- Pavesi, G -- Pesole, G -- Petrovsky, N -- Piazza, S -- Reed, J -- Reid, J F -- Ring, B Z -- Ringwald, M -- Rost, B -- Ruan, Y -- Salzberg, S L -- Sandelin, A -- Schneider, C -- Schonbach, C -- Sekiguchi, K -- Semple, C A M -- Seno, S -- Sessa, L -- Sheng, Y -- Shibata, Y -- Shimada, H -- Shimada, K -- Silva, D -- Sinclair, B -- Sperling, S -- Stupka, E -- Sugiura, K -- Sultana, R -- Takenaka, Y -- Taki, K -- Tammoja, K -- Tan, S L -- Tang, S -- Taylor, M S -- Tegner, J -- Teichmann, S A -- Ueda, H R -- van Nimwegen, E -- Verardo, R -- Wei, C L -- Yagi, K -- Yamanishi, H -- Zabarovsky, E -- Zhu, S -- Zimmer, A -- Hide, W -- Bult, C -- Grimmond, S M -- Teasdale, R D -- Liu, E T -- Brusic, V -- Quackenbush, J -- Wahlestedt, C -- Mattick, J S -- Hume, D A -- Kai, C -- Sasaki, D -- Tomaru, Y -- Fukuda, S -- Kanamori-Katayama, M -- Suzuki, M -- Aoki, J -- Arakawa, T -- Iida, J -- Imamura, K -- Itoh, M -- Kato, T -- Kawaji, H -- Kawagashira, N -- Kawashima, T -- Kojima, M -- Kondo, S -- Konno, H -- Nakano, K -- Ninomiya, N -- Nishio, T -- Okada, M -- Plessy, C -- Shibata, K -- Shiraki, T -- Suzuki, S -- Tagami, M -- Waki, K -- Watahiki, A -- Okamura-Oho, Y -- Suzuki, H -- Kawai, J -- Hayashizaki, Y -- FANTOM Consortium -- RIKEN Genome Exploration Research Group and Genome Science Group (Genome Network Project Core Group) -- TGM03P17/Telethon/Italy -- TGM06S01/Telethon/Italy -- New York, N.Y. -- Science. 2005 Sep 2;309(5740):1559-63.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/16141072" target="_blank"〉PubMed〈/a〉
    Keywords: 3' Untranslated Regions ; Animals ; Base Sequence ; Conserved Sequence ; DNA, Complementary/chemistry ; *Genome ; Genome, Human ; Genomics ; Humans ; Mice/*genetics ; Promoter Regions, Genetic ; Proteins/genetics ; RNA/chemistry/classification ; RNA Splicing ; RNA, Untranslated/chemistry ; Regulatory Sequences, Ribonucleic Acid ; *Terminator Regions, Genetic ; *Transcription Initiation Site ; *Transcription, Genetic
    Print ISSN: 0036-8075
    Electronic ISSN: 1095-9203
    Topics: Biology , Chemistry and Pharmacology , Computer Science , Medicine , Natural Sciences in General , Physics
    Published by American Association for the Advancement of Science (AAAS)
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  • 4
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    Crystal structure of a phosphorylation-coupled saccharide transporter (2011)
    Nature Publishing Group (NPG)
    Details
    Publication Date: 2011-04-08
    Description: Saccharides have a central role in the nutrition of all living organisms. Whereas several saccharide uptake systems are shared between the different phylogenetic kingdoms, the phosphoenolpyruvate-dependent phosphotransferase system exists almost exclusively in bacteria. This multi-component system includes an integral membrane protein EIIC that transports saccharides and assists in their phosphorylation. Here we present the crystal structure of an EIIC from Bacillus cereus that transports diacetylchitobiose. The EIIC is a homodimer, with an expansive interface formed between the amino-terminal halves of the two protomers. The carboxy-terminal half of each protomer has a large binding pocket that contains a diacetylchitobiose, which is occluded from both sides of the membrane with its site of phosphorylation near the conserved His250 and Glu334 residues. The structure shows the architecture of this important class of transporters, identifies the determinants of substrate binding and phosphorylation, and provides a framework for understanding the mechanism of sugar translocation.〈br /〉〈br /〉〈a href="https://www.ncbi.nlm.nih.gov/pmc/articles/PMC3201810/" 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/PMC3201810/" target="_blank"〉This paper as free author manuscript - peer-reviewed and accepted for publication〈/a〉〈br /〉〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Cao, Yu -- Jin, Xiangshu -- Levin, Elena J -- Huang, Hua -- Zong, Yinong -- Quick, Matthias -- Weng, Jun -- Pan, Yaping -- Love, James -- Punta, Marco -- Rost, Burkhard -- Hendrickson, Wayne A -- Javitch, Jonathan A -- Rajashankar, Kanagalaghatta R -- Zhou, Ming -- DK088057/DK/NIDDK NIH HHS/ -- GM05026/GM/NIGMS NIH HHS/ -- GM05026-SUB0007/GM/NIGMS NIH HHS/ -- GM098878/GM/NIGMS NIH HHS/ -- K05 DA022413/DA/NIDA NIH HHS/ -- P30 EB009998/EB/NIBIB NIH HHS/ -- R01 DK088057/DK/NIDDK NIH HHS/ -- R01 GM098878/GM/NIGMS NIH HHS/ -- T32HL087745/HL/NHLBI NIH HHS/ -- England -- Nature. 2011 May 5;473(7345):50-4. doi: 10.1038/nature09939. Epub 2011 Apr 6.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Department of Physiology & Cellular Biophysics, College of Physicians and Surgeons, Columbia University, 630 West 168th Street, New York, New York 10032, USA.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/21471968" target="_blank"〉PubMed〈/a〉
    Keywords: Bacillus cereus/*enzymology ; Binding Sites ; Carbohydrate Metabolism ; Crystallization ; Membrane Transport Proteins/*chemistry ; *Models, Molecular ; Phosphorylation ; Protein Structure, Quaternary ; Protein Structure, Tertiary
    Print ISSN: 0028-0836
    Electronic ISSN: 1476-4687
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
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  • 5
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    Sensitivity of coccolithophores to carbonate chemistry and ocean acidification (2011)
    Nature Publishing Group (NPG)
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    Publication Date: 2011-08-05
    Description: About one-third of the carbon dioxide (CO(2)) released into the atmosphere as a result of human activity has been absorbed by the oceans, where it partitions into the constituent ions of carbonic acid. This leads to ocean acidification, one of the major threats to marine ecosystems and particularly to calcifying organisms such as corals, foraminifera and coccolithophores. Coccolithophores are abundant phytoplankton that are responsible for a large part of modern oceanic carbonate production. Culture experiments investigating the physiological response of coccolithophore calcification to increased CO(2) have yielded contradictory results between and even within species. Here we quantified the calcite mass of dominant coccolithophores in the present ocean and over the past forty thousand years, and found a marked pattern of decreasing calcification with increasing partial pressure of CO(2) and concomitant decreasing concentrations of CO(3)(2-). Our analyses revealed that differentially calcified species and morphotypes are distributed in the ocean according to carbonate chemistry. A substantial impact on the marine carbon cycle might be expected upon extrapolation of this correlation to predicted ocean acidification in the future. However, our discovery of a heavily calcified Emiliania huxleyi morphotype in modern waters with low pH highlights the complexity of assemblage-level responses to environmental forcing factors.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Beaufort, L -- Probert, I -- de Garidel-Thoron, T -- Bendif, E M -- Ruiz-Pino, D -- Metzl, N -- Goyet, C -- Buchet, N -- Coupel, P -- Grelaud, M -- Rost, B -- Rickaby, R E M -- de Vargas, C -- 205150/European Research Council/International -- England -- Nature. 2011 Aug 3;476(7358):80-3. doi: 10.1038/nature10295.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉CEREGE, CNRS/Universite Aix-Marseille, Avenue L. Philibert BP80, 13545 Aix-en-Provence, Cedex 4, France. beaufort@cerege.fr〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/21814280" target="_blank"〉PubMed〈/a〉
    Keywords: Aquatic Organisms/chemistry/metabolism ; Atmosphere/chemistry ; Body Weight ; *Calcification, Physiologic ; Calcium/metabolism ; Calcium Carbonate/*analysis/chemistry/metabolism ; Carbon Cycle ; Carbon Dioxide/analysis/chemistry ; Carbonic Acid/*analysis/chemistry ; Fossils ; Geologic Sediments/chemistry ; Haptophyta/chemistry/*metabolism ; Hydrogen-Ion Concentration ; Molecular Sequence Data ; Oceans and Seas ; Pacific Ocean ; Partial Pressure ; Photosynthesis ; Phytoplankton/chemistry/*metabolism ; Seawater/*chemistry
    Print ISSN: 0028-0836
    Electronic ISSN: 1476-4687
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
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  • 6
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    Crystal structure of a potassium ion transporter, TrkH (2011)
    Nature Publishing Group (NPG)
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    Publication Date: 2011-02-15
    Description: The TrkH/TrkG/KtrB proteins mediate K(+) uptake in bacteria and probably evolved from simple K(+) channels by multiple gene duplications or fusions. Here we present the crystal structure of a TrkH from Vibrio parahaemolyticus. TrkH is a homodimer, and each protomer contains an ion permeation pathway. A selectivity filter, similar in architecture to those of K(+) channels but significantly shorter, is lined by backbone and side-chain oxygen atoms. Functional studies showed that TrkH is selective for permeation of K(+) and Rb(+) over smaller ions such as Na(+) or Li(+). Immediately intracellular to the selectivity filter are an intramembrane loop and an arginine residue, both highly conserved, which constrict the permeation pathway. Substituting the arginine with an alanine significantly increases the rate of K(+) flux. These results reveal the molecular basis of K(+) selectivity and suggest a novel gating mechanism for this large and important family of membrane transport proteins.〈br /〉〈br /〉〈a href="https://www.ncbi.nlm.nih.gov/pmc/articles/PMC3077569/" 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/PMC3077569/" target="_blank"〉This paper as free author manuscript - peer-reviewed and accepted for publication〈/a〉〈br /〉〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Cao, Yu -- Jin, Xiangshu -- Huang, Hua -- Derebe, Mehabaw Getahun -- Levin, Elena J -- Kabaleeswaran, Venkataraman -- Pan, Yaping -- Punta, Marco -- Love, James -- Weng, Jun -- Quick, Matthias -- Ye, Sheng -- Kloss, Brian -- Bruni, Renato -- Martinez-Hackert, Erik -- Hendrickson, Wayne A -- Rost, Burkhard -- Javitch, Jonathan A -- Rajashankar, Kanagalaghatta R -- Jiang, Youxing -- Zhou, Ming -- DK088057/DK/NIDDK NIH HHS/ -- GM05026/GM/NIGMS NIH HHS/ -- GM05026-SUB0007/GM/NIGMS NIH HHS/ -- HL086392/HL/NHLBI NIH HHS/ -- K05 DA022413/DA/NIDA NIH HHS/ -- P30 EB009998/EB/NIBIB NIH HHS/ -- R01 DK088057/DK/NIDDK NIH HHS/ -- R01 DK088057-01/DK/NIDDK NIH HHS/ -- R01 HL086392/HL/NHLBI NIH HHS/ -- R01 HL086392-05/HL/NHLBI NIH HHS/ -- Howard Hughes Medical Institute/ -- England -- Nature. 2011 Mar 17;471(7338):336-40. doi: 10.1038/nature09731. Epub 2011 Feb 13.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Department of Physiology & Cellular Biophysics, College of Physicians and Surgeons, Columbia University, 630 West 168th Street, New York, New York 10032, USA.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/21317882" target="_blank"〉PubMed〈/a〉
    Keywords: ATP-Binding Cassette Transporters/chemistry ; Amino Acid Sequence ; Crystallography, X-Ray ; Escherichia coli Proteins/chemistry ; Ion Channel Gating ; Ion Transport ; Models, Molecular ; Molecular Sequence Data ; Potassium/metabolism ; Potassium Channels/*chemistry/*metabolism ; Structure-Activity Relationship ; Substrate Specificity ; Vibrio parahaemolyticus/*chemistry
    Print ISSN: 0028-0836
    Electronic ISSN: 1476-4687
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
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  • 7
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    Structure and selectivity in bestrophin ion channels (2014)
    American Association for the Advancement of Science (AAAS)
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    Publication Date: 2014-10-18
    Description: Human bestrophin-1 (hBest1) is a calcium-activated chloride channel from the retinal pigment epithelium, where mutations are associated with vitelliform macular degeneration, or Best disease. We describe the structure of a bacterial homolog (KpBest) of hBest1 and functional characterizations of both channels. KpBest is a pentamer that forms a five-helix transmembrane pore, closed by three rings of conserved hydrophobic residues, and has a cytoplasmic cavern with a restricted exit. From electrophysiological analysis of structure-inspired mutations in KpBest and hBest1, we find a sensitive control of ion selectivity in the bestrophins, including reversal of anion/cation selectivity, and dramatic activation by mutations at the cytoplasmic exit. A homology model of hBest1 shows the locations of disease-causing mutations and suggests possible roles in regulation.〈br /〉〈br /〉〈a href="https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4341822/" 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/PMC4341822/" target="_blank"〉This paper as free author manuscript - peer-reviewed and accepted for publication〈/a〉〈br /〉〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Yang, Tingting -- Liu, Qun -- Kloss, Brian -- Bruni, Renato -- Kalathur, Ravi C -- Guo, Youzhong -- Kloppmann, Edda -- Rost, Burkhard -- Colecraft, Henry M -- Hendrickson, Wayne A -- GM095315/GM/NIGMS NIH HHS/ -- GM107462/GM/NIGMS NIH HHS/ -- R01 GM107462/GM/NIGMS NIH HHS/ -- U54 GM075026/GM/NIGMS NIH HHS/ -- New York, N.Y. -- Science. 2014 Oct 17;346(6207):355-9. doi: 10.1126/science.1259723. Epub 2014 Sep 25.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Department of Biochemistry and Molecular Biophysics, Columbia University, New York, NY 10032, USA. ; New York Structural Biology Center, Synchrotron Beamlines, Brookhaven National Laboratory, Upton, NY 11973, USA. ; New York Consortium on Membrane Protein Structure, New York Structural Biology Center, 89 Convent Avenue, New York, NY 10027, USA. ; New York Consortium on Membrane Protein Structure, New York Structural Biology Center, 89 Convent Avenue, New York, NY 10027, USA. Department of Informatics, Bioinformatics and Computational Biology, TUM (Technische Universitat Munchen), Garching 85748, Germany. ; Department of Physiology and Cellular Biophysics, Columbia University, New York, NY 10032, USA. ; Department of Biochemistry and Molecular Biophysics, Columbia University, New York, NY 10032, USA. New York Structural Biology Center, Synchrotron Beamlines, Brookhaven National Laboratory, Upton, NY 11973, USA. New York Consortium on Membrane Protein Structure, New York Structural Biology Center, 89 Convent Avenue, New York, NY 10027, USA. Department of Physiology and Cellular Biophysics, Columbia University, New York, NY 10032, USA. wayne@xtl.cumc.columbia.edu.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/25324390" target="_blank"〉PubMed〈/a〉
    Keywords: Bacterial Proteins/*chemistry ; Chloride Channels/*chemistry ; Crystallography, X-Ray ; Electric Conductivity ; Eye Proteins/*chemistry ; Humans ; *Klebsiella pneumoniae ; Protein Conformation ; Static Electricity
    Print ISSN: 0036-8075
    Electronic ISSN: 1095-9203
    Topics: Biology , Chemistry and Pharmacology , Computer Science , Medicine , Natural Sciences in General , Physics
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  • 8
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    Structural basis for a pH-sensitive calcium leak across membranes (2014)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 2014-06-07
    Description: Calcium homeostasis balances passive calcium leak and active calcium uptake. Human Bax inhibitor-1 (hBI-1) is an antiapoptotic protein that mediates a calcium leak and is representative of a highly conserved and widely distributed family, the transmembrane Bax inhibitor motif (TMBIM) proteins. Here, we present crystal structures of a bacterial homolog and characterize its calcium leak activity. The structure has a seven-transmembrane-helix fold that features two triple-helix sandwiches wrapped around a central C-terminal helix. Structures obtained in closed and open conformations are reversibly interconvertible by change of pH. A hydrogen-bonded, pKa (where Ka is the acid dissociation constant)-perturbed pair of conserved aspartate residues explains the pH dependence of this transition, and biochemical studies show that pH regulates calcium influx in proteoliposomes. Homology models for hBI-1 provide insights into TMBIM-mediated calcium leak and cytoprotective activity.〈br /〉〈br /〉〈a href="https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4119810/" 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/PMC4119810/" target="_blank"〉This paper as free author manuscript - peer-reviewed and accepted for publication〈/a〉〈br /〉〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Chang, Yanqi -- Bruni, Renato -- Kloss, Brian -- Assur, Zahra -- Kloppmann, Edda -- Rost, Burkhard -- Hendrickson, Wayne A -- Liu, Qun -- GM095315/GM/NIGMS NIH HHS/ -- GM107462/GM/NIGMS NIH HHS/ -- R01 GM107462/GM/NIGMS NIH HHS/ -- U54 GM095315/GM/NIGMS NIH HHS/ -- New York, N.Y. -- Science. 2014 Jun 6;344(6188):1131-5. doi: 10.1126/science.1252043.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉New York Consortium on Membrane Protein Structure, New York Structural Biology Center, New York, NY 10027, USA. ; Department of Physiology and Cellular Biophysics, Columbia University, New York, NY 10032, USA. ; New York Consortium on Membrane Protein Structure, New York Structural Biology Center, New York, NY 10027, USA. Department of Bioinformatics and Computational Biology, Fakultat fur Informatik, Technische Universitat Munchen, Garching, Germany. ; New York Consortium on Membrane Protein Structure, New York Structural Biology Center, New York, NY 10027, USA. Department of Physiology and Cellular Biophysics, Columbia University, New York, NY 10032, USA. New York Structural Biology Center, National Synchrotron Light Source (NSLS) X4, Brookhaven National Laboratory, Upton, NY 11973, USA. Department of Biochemistry and Molecular Biophysics, Columbia University, New York, NY 10032, USA. ; New York Consortium on Membrane Protein Structure, New York Structural Biology Center, New York, NY 10027, USA. New York Structural Biology Center, National Synchrotron Light Source (NSLS) X4, Brookhaven National Laboratory, Upton, NY 11973, USA. qunliu@bnl.gov.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/24904158" target="_blank"〉PubMed〈/a〉
    Keywords: Bacillus subtilis/*metabolism ; Bacterial Proteins/*chemistry/metabolism ; Calcium/*metabolism ; Cell Membrane/*metabolism ; Crystallography, X-Ray ; Humans ; Hydrogen-Ion Concentration ; Membrane Proteins/*chemistry/metabolism ; Models, Molecular ; Protein Structure, Secondary
    Print ISSN: 0036-8075
    Electronic ISSN: 1095-9203
    Topics: Biology , Chemistry and Pharmacology , Computer Science , Medicine , Natural Sciences in General , Physics
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    Protein structure. Structure and activity of tryptophan-rich TSPO proteins (2015)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 2015-01-31
    Description: Translocator proteins (TSPOs) bind steroids and porphyrins, and they are implicated in many human diseases, for which they serve as biomarkers and therapeutic targets. TSPOs have tryptophan-rich sequences that are highly conserved from bacteria to mammals. Here we report crystal structures for Bacillus cereus TSPO (BcTSPO) down to 1.7 A resolution, including a complex with the benzodiazepine-like inhibitor PK11195. We also describe BcTSPO-mediated protoporphyrin IX (PpIX) reactions, including catalytic degradation to a previously undescribed heme derivative. We used structure-inspired mutations to investigate reaction mechanisms, and we showed that TSPOs from Xenopus and man have similar PpIX-directed activities. Although TSPOs have been regarded as transporters, the catalytic activity in PpIX degradation suggests physiological importance for TSPOs in protection against oxidative stress.〈br /〉〈br /〉〈a href="https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4341906/" 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/PMC4341906/" target="_blank"〉This paper as free author manuscript - peer-reviewed and accepted for publication〈/a〉〈br /〉〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Guo, Youzhong -- Kalathur, Ravi C -- Liu, Qun -- Kloss, Brian -- Bruni, Renato -- Ginter, Christopher -- Kloppmann, Edda -- Rost, Burkhard -- Hendrickson, Wayne A -- GM095315/GM/NIGMS NIH HHS/ -- GM107462/GM/NIGMS NIH HHS/ -- R01 GM107462/GM/NIGMS NIH HHS/ -- U54 GM075026/GM/NIGMS NIH HHS/ -- New York, N.Y. -- Science. 2015 Jan 30;347(6221):551-5. doi: 10.1126/science.aaa1534.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Department of Biochemistry and Molecular Biophysics, Columbia University, New York, NY 10032, USA. ; The New York Consortium on Membrane Protein Structure (NYCOMPS), New York Structural Biology Center, 89 Convent Avenue, New York, NY 10027, USA. ; The New York Consortium on Membrane Protein Structure (NYCOMPS), New York Structural Biology Center, 89 Convent Avenue, New York, NY 10027, USA. New York Structural Biology Center, Synchrotron Beamlines, Brookhaven National Laboratory, Upton, NY 11973, USA. ; The New York Consortium on Membrane Protein Structure (NYCOMPS), New York Structural Biology Center, 89 Convent Avenue, New York, NY 10027, USA. Department of Informatics, Bioinformatics and Computational Biology, Technische Universitat Munchen, Garching 85748, Germany. ; Department of Biochemistry and Molecular Biophysics, Columbia University, New York, NY 10032, USA. The New York Consortium on Membrane Protein Structure (NYCOMPS), New York Structural Biology Center, 89 Convent Avenue, New York, NY 10027, USA. New York Structural Biology Center, Synchrotron Beamlines, Brookhaven National Laboratory, Upton, NY 11973, USA. Department of Physiology and Cellular Biophysics, Columbia University, New York, NY 10032, USA. wayne@xtl.cumc.columbia.edu.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/25635100" target="_blank"〉PubMed〈/a〉
    Keywords: Amino Acid Sequence ; Bacillus cereus/*chemistry ; Bacterial Proteins/*chemistry/*metabolism ; Binding Sites ; Crystallography, X-Ray ; Isoquinolines/metabolism ; Ligands ; Membrane Transport Proteins/*chemistry/*metabolism ; Molecular Sequence Data ; Mutant Proteins/chemistry/metabolism ; Protein Conformation ; Protein Multimerization ; Protein Structure, Secondary ; Protein Subunits/chemistry ; Protoporphyrins/metabolism ; Reactive Oxygen Species/metabolism ; Tryptophan/analysis
    Print ISSN: 0036-8075
    Electronic ISSN: 1095-9203
    Topics: Biology , Chemistry and Pharmacology , Computer Science , Medicine , Natural Sciences in General , Physics
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    Structures of aminoarabinose transferase ArnT suggest a molecular basis for lipid A glycosylation (2016)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 2016-02-26
    Description: Polymyxins are antibiotics used in the last line of defense to combat multidrug-resistant infections by Gram-negative bacteria. Polymyxin resistance arises through charge modification of the bacterial outer membrane with the attachment of the cationic sugar 4-amino-4-deoxy-l-arabinose to lipid A, a reaction catalyzed by the integral membrane lipid-to-lipid glycosyltransferase 4-amino-4-deoxy-L-arabinose transferase (ArnT). Here, we report crystal structures of ArnT from Cupriavidus metallidurans, alone and in complex with the lipid carrier undecaprenyl phosphate, at 2.8 and 3.2 angstrom resolution, respectively. The structures show cavities for both lipidic substrates, which converge at the active site. A structural rearrangement occurs on undecaprenyl phosphate binding, which stabilizes the active site and likely allows lipid A binding. Functional mutagenesis experiments based on these structures suggest a mechanistic model for ArnT family enzymes.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Petrou, Vasileios I -- Herrera, Carmen M -- Schultz, Kathryn M -- Clarke, Oliver B -- Vendome, Jeremie -- Tomasek, David -- Banerjee, Surajit -- Rajashankar, Kanagalaghatta R -- Belcher Dufrisne, Meagan -- Kloss, Brian -- Kloppmann, Edda -- Rost, Burkhard -- Klug, Candice S -- Trent, M Stephen -- Shapiro, Lawrence -- Mancia, Filippo -- AI064184/AI/NIAID NIH HHS/ -- AI076322/AI/NIAID NIH HHS/ -- P41 GM103403/GM/NIGMS NIH HHS/ -- R01 GM111980/GM/NIGMS NIH HHS/ -- S10 RR029205/RR/NCRR NIH HHS/ -- U54 GM095315/GM/NIGMS NIH HHS/ -- New York, N.Y. -- Science. 2016 Feb 5;351(6273):608-12. doi: 10.1126/science.aad1172.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Department of Physiology and Cellular Biophysics, Columbia University, New York, NY 10032, USA. ; Department of Infectious Diseases, University of Georgia, College of Veterinary Medicine, Athens, GA 30602, USA. ; Department of Biophysics, Medical College of Wisconsin, Milwaukee, WI 53226, USA. ; Department of Biochemistry and Molecular Biophysics, Columbia University, New York, NY 10032, USA. ; Department of Biochemistry and Molecular Biophysics, Columbia University, New York, NY 10032, USA. Department of Systems Biology, Columbia University, New York, NY 10032, USA. ; Department of Chemistry and Chemical Biology, Cornell University, Northeastern Collaborative Access Team, Advanced Photon Source, Argonne, IL 60439, USA. ; New York Consortium on Membrane Protein Structure, New York Structural Biology Center, 89 Convent Avenue, New York, NY 10027, USA. ; Department of Informatics, Bioinformatics and Computational Biology, Technische Universitat Munchen, Boltzmannstrasse 3, 85748 Garching, Germany. ; Department of Informatics, Bioinformatics and Computational Biology, Technische Universitat Munchen, Boltzmannstrasse 3, 85748 Garching, Germany. Institute for Advanced Study (TUM-IAS), Technische Universitat Munchen, Boltzmannstrasse 3, 85748 Garching, Germany. ; Department of Physiology and Cellular Biophysics, Columbia University, New York, NY 10032, USA. fm123@cumc.columbia.edu.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/26912703" target="_blank"〉PubMed〈/a〉
    Print ISSN: 0036-8075
    Electronic ISSN: 1095-9203
    Topics: Biology , Chemistry and Pharmacology , Computer Science , Medicine , Natural Sciences in General , Physics
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