1kpk

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(New page: 200px<br /><applet load="1kpk" size="450" color="white" frame="true" align="right" spinBox="true" caption="1kpk, resolution 3.50&Aring;" /> '''Crystal Structure of...)
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[[Image:1kpk.gif|left|200px]]<br /><applet load="1kpk" size="450" color="white" frame="true" align="right" spinBox="true"
 
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caption="1kpk, resolution 3.50&Aring;" />
 
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'''Crystal Structure of the ClC Chloride Channel from E. coli'''<br />
 
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==Overview==
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==Crystal Structure of the ClC Chloride Channel from E. coli==
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The ClC chloride channels catalyse the selective flow of Cl- ions across, cell membranes, thereby regulating electrical excitation in skeletal, muscle and the flow of salt and water across epithelial barriers. Genetic, defects in ClC Cl- channels underlie several familial muscle and kidney, diseases. Here we present the X-ray structures of two prokaryotic ClC Cl-, channels from Salmonella enterica serovar typhimurium and Escherichia coli, at 3.0 and 3.5 A, respectively. Both structures reveal two identical, pores, each pore being formed by a separate subunit contained within a, homodimeric membrane protein. Individual subunits are composed of two, roughly repeated halves that span the membrane with opposite orientations., This antiparallel architecture defines a selectivity filter in which a Cl-, ion is stabilized by electrostatic interactions with alpha-helix dipoles, and by chemical coordination with nitrogen atoms and hydroxyl groups., These findings provide a structural basis for further understanding the, function of ClC Cl- channels, and establish the physical and chemical, basis of their anion selectivity.
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<StructureSection load='1kpk' size='340' side='right'caption='[[1kpk]], [[Resolution|resolution]] 3.50&Aring;' scene=''>
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== Structural highlights ==
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==About this Structure==
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<table><tr><td colspan='2'>[[1kpk]] is a 6 chain structure with sequence from [https://en.wikipedia.org/wiki/Escherichia_coli Escherichia coli]. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=1KPK OCA]. For a <b>guided tour on the structure components</b> use [https://proteopedia.org/fgij/fg.htm?mol=1KPK FirstGlance]. <br>
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1KPK is a [http://en.wikipedia.org/wiki/Single_protein Single protein] structure of sequence from [http://en.wikipedia.org/wiki/Escherichia_coli Escherichia coli]. Full crystallographic information is available from [http://ispc.weizmann.ac.il/oca-bin/ocashort?id=1KPK OCA].
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</td></tr><tr id='method'><td class="sblockLbl"><b>[[Empirical_models|Method:]]</b></td><td class="sblockDat" id="methodDat">X-ray diffraction, [[Resolution|Resolution]] 3.5&#8491;</td></tr>
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<tr id='resources'><td class="sblockLbl"><b>Resources:</b></td><td class="sblockDat"><span class='plainlinks'>[https://proteopedia.org/fgij/fg.htm?mol=1kpk FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=1kpk OCA], [https://pdbe.org/1kpk PDBe], [https://www.rcsb.org/pdb/explore.do?structureId=1kpk RCSB], [https://www.ebi.ac.uk/pdbsum/1kpk PDBsum], [https://prosat.h-its.org/prosat/prosatexe?pdbcode=1kpk ProSAT]</span></td></tr>
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==Reference==
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</table>
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X-ray structure of a ClC chloride channel at 3.0 A reveals the molecular basis of anion selectivity., Dutzler R, Campbell EB, Cadene M, Chait BT, MacKinnon R, Nature. 2002 Jan 17;415(6869):287-94. PMID:[http://ispc.weizmann.ac.il//pmbin/getpm?pmid=11796999 11796999]
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== Function ==
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[https://www.uniprot.org/uniprot/CLCA_ECOLI CLCA_ECOLI] Proton-coupled chloride transporter. Functions as antiport system and exchanges two chloride ions for 1 proton. Probably acts as an electrical shunt for an outwardly-directed proton pump that is linked to amino acid decarboxylation, as part of the extreme acid resistance (XAR) response.<ref>PMID:12384697</ref> <ref>PMID:14985752</ref> <ref>PMID:16341087</ref> <ref>PMID:16905147</ref> <ref>PMID:18678918</ref>
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== Evolutionary Conservation ==
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[[Image:Consurf_key_small.gif|200px|right]]
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Check<jmol>
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<jmolCheckbox>
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<scriptWhenChecked>; select protein; define ~consurf_to_do selected; consurf_initial_scene = true; script "/wiki/ConSurf/kp/1kpk_consurf.spt"</scriptWhenChecked>
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<scriptWhenUnchecked>script /wiki/extensions/Proteopedia/spt/initialview01.spt</scriptWhenUnchecked>
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<text>to colour the structure by Evolutionary Conservation</text>
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</jmolCheckbox>
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</jmol>, as determined by [http://consurfdb.tau.ac.il/ ConSurfDB]. You may read the [[Conservation%2C_Evolutionary|explanation]] of the method and the full data available from [http://bental.tau.ac.il/new_ConSurfDB/main_output.php?pdb_ID=1kpk ConSurf].
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<div style="clear:both"></div>
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== References ==
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<references/>
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__TOC__
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</StructureSection>
[[Category: Escherichia coli]]
[[Category: Escherichia coli]]
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[[Category: Single protein]]
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[[Category: Large Structures]]
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[[Category: Cadene, M.]]
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[[Category: Cadene M]]
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[[Category: Campbell, E.B.]]
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[[Category: Campbell EB]]
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[[Category: Chait, B.T.]]
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[[Category: Chait BT]]
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[[Category: Dutzler, R.]]
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[[Category: Dutzler R]]
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[[Category: MacKinnon, R.]]
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[[Category: MacKinnon R]]
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[[Category: helical membrane protein]]
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[[Category: homodimer]]
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''Page seeded by [http://ispc.weizmann.ac.il/oca OCA ] on Tue Nov 20 19:34:59 2007''
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Current revision

Crystal Structure of the ClC Chloride Channel from E. coli

PDB ID 1kpk

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