4kka: Difference between revisions

Revision as of 13:31, 4 August 2016

Structure of the E148A mutant of CLC-ec1 deltaNC construct in 100mM fluoride and 20mM Bromide

Structural highlights

4kka is a 6 chain structure with sequence from Ecoli and Lk3 transgenic mice. Full crystallographic information is available from OCA. For a guided tour on the structure components use FirstGlance.
Related:	4kjw, 4kk5, 4kk6, 4kk8, 4kk9, 4kkb, 4kkc, 4kjp, 4kjq
Gene:	b0155, clcA, eriC, JW5012, yadQ (ECOLI)
Resources:	FirstGlance, OCA, PDBe, RCSB, PDBsum, ProSAT

Function

[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.^[1] ^[2] ^[3] ^[4] ^[5]

Publication Abstract from PubMed

Cl-/H+ antiporters of the CLC superfamily transport anions across biological membranes in varied physiological contexts. These proteins are weakly selective among anions commonly studied, including Cl-, Br-, I-, NO3- and SCN-, but they seem to be very selective against F-. The recent discovery of a new CLC clade of F-/H+ antiporters, which are highly selective for F- over Cl-, led us to investigate the mechanism of Cl--over-F- selectivity by a CLC Cl-/H+ antiporter, CLC-ec1. By subjecting purified CLC-ec1 to anion transport measurements, electrophysiological recording, equilibrium ligand-binding studies and X-ray crystallography, we show that F- binds in the Cl- transport pathway with affinity similar to Cl- but stalls the transport cycle. Examination of various mutant antiporters implies a 'lock-down' mechanism of F- inhibition, in which F-, by virtue of its unique hydrogen-bonding chemistry, greatly retards a proton-linked conformational change essential for the transport cycle of CLC-ec1.

Fluoride-dependent interruption of the transport cycle of a CLC Cl/H antiporter.,Lim HH, Stockbridge RB, Miller C Nat Chem Biol. 2013 Sep 15. doi: 10.1038/nchembio.1336. PMID:24036509^[6]

From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine.

References

↑ Iyer R, Iverson TM, Accardi A, Miller C. A biological role for prokaryotic ClC chloride channels. Nature. 2002 Oct 17;419(6908):715-8. PMID:12384697 doi:10.1038/nature01000
↑ Accardi A, Miller C. Secondary active transport mediated by a prokaryotic homologue of ClC Cl- channels. Nature. 2004 Feb 26;427(6977):803-7. PMID:14985752 doi:10.1038/nature02314
↑ Lobet S, Dutzler R. Ion-binding properties of the ClC chloride selectivity filter. EMBO J. 2006 Jan 11;25(1):24-33. Epub 2005 Dec 8. PMID:16341087
↑ Nguitragool W, Miller C. Uncoupling of a CLC Cl-/H+ exchange transporter by polyatomic anions. J Mol Biol. 2006 Sep 29;362(4):682-90. Epub 2006 Aug 14. PMID:16905147 doi:10.1016/j.jmb.2006.07.006
↑ Jayaram H, Accardi A, Wu F, Williams C, Miller C. Ion permeation through a Cl--selective channel designed from a CLC Cl-/H+ exchanger. Proc Natl Acad Sci U S A. 2008 Aug 12;105(32):11194-9. Epub 2008 Aug 4. PMID:18678918
↑ Lim HH, Stockbridge RB, Miller C. Fluoride-dependent interruption of the transport cycle of a CLC Cl/H antiporter. Nat Chem Biol. 2013 Sep 15. doi: 10.1038/nchembio.1336. PMID:24036509 doi:https://dx.doi.org/10.1038/nchembio.1336

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OCA

[1] Iyer R, Iverson TM, Accardi A, Miller C. A biological role for prokaryotic ClC chloride channels. Nature. 2002 Oct 17;419(6908):715-8. PMID:12384697 doi:10.1038/nature01000

[2] Accardi A, Miller C. Secondary active transport mediated by a prokaryotic homologue of ClC Cl- channels. Nature. 2004 Feb 26;427(6977):803-7. PMID:14985752 doi:10.1038/nature02314

[3] Lobet S, Dutzler R. Ion-binding properties of the ClC chloride selectivity filter. EMBO J. 2006 Jan 11;25(1):24-33. Epub 2005 Dec 8. PMID:16341087

[4] Nguitragool W, Miller C. Uncoupling of a CLC Cl-/H+ exchange transporter by polyatomic anions. J Mol Biol. 2006 Sep 29;362(4):682-90. Epub 2006 Aug 14. PMID:16905147 doi:10.1016/j.jmb.2006.07.006

[5] Jayaram H, Accardi A, Wu F, Williams C, Miller C. Ion permeation through a Cl--selective channel designed from a CLC Cl-/H+ exchanger. Proc Natl Acad Sci U S A. 2008 Aug 12;105(32):11194-9. Epub 2008 Aug 4. PMID:18678918

[6] Lim HH, Stockbridge RB, Miller C. Fluoride-dependent interruption of the transport cycle of a CLC Cl/H antiporter. Nat Chem Biol. 2013 Sep 15. doi: 10.1038/nchembio.1336. PMID:24036509 doi:https://dx.doi.org/10.1038/nchembio.1336

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@@ Line 1: / Line 1: @@
 ==Structure of the E148A mutant of CLC-ec1 deltaNC construct in 100mM fluoride and 20mM Bromide==
 <StructureSection load='4kka' size='340' side='right' caption='[[4kka]], [[Resolution|resolution]] 3.00&Aring;' scene=''>
@@ Line 5: / Line 6: @@
 </td></tr><tr id='related'><td class="sblockLbl"><b>[[Related_structure|Related:]]</b></td><td class="sblockDat">[[4kjw|4kjw]], [[4kk5|4kk5]], [[4kk6|4kk6]], [[4kk8|4kk8]], [[4kk9|4kk9]], [[4kkb|4kkb]], [[4kkc|4kkc]], [[4kjp|4kjp]], [[4kjq|4kjq]]</td></tr>
 <tr id='gene'><td class="sblockLbl"><b>[[Gene|Gene:]]</b></td><td class="sblockDat">b0155, clcA, eriC, JW5012, yadQ ([http://www.ncbi.nlm.nih.gov/Taxonomy/Browser/wwwtax.cgi?mode=Info&srchmode=5&id=83333 ECOLI])</td></tr>
-<tr id='resources'><td class="sblockLbl"><b>Resources:</b></td><td class="sblockDat"><span class='plainlinks'>[http://oca.weizmann.ac.il/oca-docs/fgij/fg.htm?mol=4kka FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=4kka OCA], [http://www.rcsb.org/pdb/explore.do?structureId=4kka RCSB], [http://www.ebi.ac.uk/pdbsum/4kka PDBsum]</span></td></tr>
+<tr id='resources'><td class="sblockLbl"><b>Resources:</b></td><td class="sblockDat"><span class='plainlinks'>[http://oca.weizmann.ac.il/oca-docs/fgij/fg.htm?mol=4kka FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=4kka OCA], [http://pdbe.org/4kka PDBe], [http://www.rcsb.org/pdb/explore.do?structureId=4kka RCSB], [http://www.ebi.ac.uk/pdbsum/4kka PDBsum], [http://prosat.h-its.org/prosat/prosatexe?pdbcode=4kka ProSAT]</span></td></tr>
 </table>
 == Function ==
@@ Line 17: / Line 18: @@
 From MEDLINE&reg;/PubMed&reg;, a database of the U.S. National Library of Medicine.<br>
 </div>
+<div class="pdbe-citations 4kka" style="background-color:#fffaf0;"></div>
 == References ==
 <references/>

4kka: Difference between revisions

Revision as of 13:31, 4 August 2016

Structure of the E148A mutant of CLC-ec1 deltaNC construct in 100mM fluoride and 20mM Bromide

Structural highlights

Function

Publication Abstract from PubMed

References

Contents

Proteopedia Page Contributors and Editors (what is this?)

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