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4mqx

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Revision as of 20:57, 5 August 2016

CLC-ec1 Fab Complex Cysless A399C-A432C mutant

Structural highlights

4mqx 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.
Ligands:
Related:	1ots
Gene:	clcA, eriC, yadQ, b0155, JW5012 (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

CLC-type exchangers mediate transmembrane Cl(-) transport. Mutations altering their gating properties cause numerous genetic disorders. However, their transport mechanism remains poorly understood. In conventional models, two gates alternatively expose substrates to the intra- or extracellular solutions. A glutamate was identified as the only gate in the CLCs, suggesting that CLCs function by a nonconventional mechanism. Here we show that transport in CLC-ec1, a prokaryotic homolog, is inhibited by cross-links constraining movement of helix O far from the transport pathway. Cross-linked CLC-ec1 adopts a wild-type-like structure, indicating stabilization of a native conformation. Movements of helix O are transduced to the ion pathway via a direct contact between its C terminus and a tyrosine that is a constitutive element of the second gate of CLC transporters. Therefore, the CLC exchangers have two gates that are coupled through conformational rearrangements outside the ion pathway.

Conformational changes required for H(+)/Cl(-) exchange mediated by a CLC transporter.,Basilio D, Noack K, Picollo A, Accardi A Nat Struct Mol Biol. 2014 May;21(5):456-63. doi: 10.1038/nsmb.2814. Epub 2014 Apr, 20. PMID:24747941^[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
↑ Basilio D, Noack K, Picollo A, Accardi A. Conformational changes required for H(+)/Cl(-) exchange mediated by a CLC transporter. Nat Struct Mol Biol. 2014 May;21(5):456-63. doi: 10.1038/nsmb.2814. Epub 2014 Apr, 20. PMID:24747941 doi:http://dx.doi.org/10.1038/nsmb.2814

1 Structural highlights
2 Function
3 Publication Abstract from PubMed
4 References

Proteopedia Page Contributors and Editors (what is this?)

OCA

Retrieved from "http://52.214.119.220/wiki/index.php/4mqx"

@@ Line 1: / Line 1: @@
 ==CLC-ec1 Fab Complex Cysless A399C-A432C mutant==
 <StructureSection load='4mqx' size='340' side='right' caption='[[4mqx]], [[Resolution|resolution]] 3.52&Aring;' scene=''>
@@ Line 6: / Line 7: @@
 <tr id='related'><td class="sblockLbl"><b>[[Related_structure|Related:]]</b></td><td class="sblockDat">[[1ots|1ots]]</td></tr>
 <tr id='gene'><td class="sblockLbl"><b>[[Gene|Gene:]]</b></td><td class="sblockDat">clcA, eriC, yadQ, b0155, JW5012 ([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=4mqx FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=4mqx OCA], [http://www.rcsb.org/pdb/explore.do?structureId=4mqx RCSB], [http://www.ebi.ac.uk/pdbsum/4mqx 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=4mqx FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=4mqx OCA], [http://pdbe.org/4mqx PDBe], [http://www.rcsb.org/pdb/explore.do?structureId=4mqx RCSB], [http://www.ebi.ac.uk/pdbsum/4mqx PDBsum], [http://prosat.h-its.org/prosat/prosatexe?pdbcode=4mqx ProSAT]</span></td></tr>
 </table>
 == Function ==
@@ Line 18: / Line 19: @@
 From MEDLINE&reg;/PubMed&reg;, a database of the U.S. National Library of Medicine.<br>
 </div>
+<div class="pdbe-citations 4mqx" style="background-color:#fffaf0;"></div>
 == References ==
 <references/>

4mqx

From Proteopedia

Revision as of 20:57, 5 August 2016

CLC-ec1 Fab Complex Cysless A399C-A432C mutant

Structural highlights

Function

Publication Abstract from PubMed

References

Contents

Proteopedia Page Contributors and Editors (what is this?)

Views

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