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3pjs

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==Mechanism of Activation Gating in the Full-Length KcsA K+ Channel==
==Mechanism of Activation Gating in the Full-Length KcsA K+ Channel==
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<StructureSection load='3pjs' size='340' side='right' caption='[[3pjs]], [[Resolution|resolution]] 3.80&Aring;' scene=''>
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<StructureSection load='3pjs' size='340' side='right'caption='[[3pjs]], [[Resolution|resolution]] 3.80&Aring;' scene=''>
== Structural highlights ==
== Structural highlights ==
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<table><tr><td colspan='2'>[[3pjs]] is a 8 chain structure with sequence from [http://en.wikipedia.org/wiki/"actinomyces_lividans"_krasil'nikov_et_al._1965 "actinomyces lividans" krasil'nikov et al. 1965] and [http://en.wikipedia.org/wiki/Lk3_transgenic_mice Lk3 transgenic mice]. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=3PJS OCA]. For a <b>guided tour on the structure components</b> use [http://oca.weizmann.ac.il/oca-docs/fgij/fg.htm?mol=3PJS FirstGlance]. <br>
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<table><tr><td colspan='2'>[[3pjs]] is a 8 chain structure with sequence from [https://en.wikipedia.org/wiki/Mus_musculus Mus musculus] and [https://en.wikipedia.org/wiki/Streptomyces_lividans Streptomyces lividans]. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=3PJS OCA]. For a <b>guided tour on the structure components</b> use [https://proteopedia.org/fgij/fg.htm?mol=3PJS FirstGlance]. <br>
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</td></tr><tr id='gene'><td class="sblockLbl"><b>[[Gene|Gene:]]</b></td><td class="sblockDat">kcsA, skc1 ([http://www.ncbi.nlm.nih.gov/Taxonomy/Browser/wwwtax.cgi?mode=Info&srchmode=5&id=1916 "Actinomyces lividans" Krasil'nikov et al. 1965])</td></tr>
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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]] 3.8&#8491;</td></tr>
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<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=3pjs FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=3pjs OCA], [http://pdbe.org/3pjs PDBe], [http://www.rcsb.org/pdb/explore.do?structureId=3pjs RCSB], [http://www.ebi.ac.uk/pdbsum/3pjs PDBsum], [http://prosat.h-its.org/prosat/prosatexe?pdbcode=3pjs ProSAT]</span></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=3pjs FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=3pjs OCA], [https://pdbe.org/3pjs PDBe], [https://www.rcsb.org/pdb/explore.do?structureId=3pjs RCSB], [https://www.ebi.ac.uk/pdbsum/3pjs PDBsum], [https://prosat.h-its.org/prosat/prosatexe?pdbcode=3pjs ProSAT]</span></td></tr>
</table>
</table>
== Function ==
== Function ==
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[[http://www.uniprot.org/uniprot/KCSA_STRLI KCSA_STRLI]] Acts as a pH-gated potassium ion channel; changing the cytosolic pH from 7 to 4 opens the channel, although it is not clear if this is the physiological stimulus for channel opening. Monovalent cation preference is K(+) > Rb(+) > NH4(+) >> Na(+) > Li(+).<ref>PMID:7489706</ref>
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[https://www.uniprot.org/uniprot/KCSA_STRLI KCSA_STRLI] Acts as a pH-gated potassium ion channel; changing the cytosolic pH from 7 to 4 opens the channel, although it is not clear if this is the physiological stimulus for channel opening. Monovalent cation preference is K(+) > Rb(+) > NH4(+) >> Na(+) > Li(+).<ref>PMID:7489706</ref>
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<div style="background-color:#fffaf0;">
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== Publication Abstract from PubMed ==
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Using a constitutively active channel mutant, we solved the structure of full-length KcsA in the open conformation at 3.9 A. The structure reveals that the activation gate expands about 20 A, exerting a strain on the bulge helices in the C-terminal domain and generating side windows large enough to accommodate hydrated K(+) ions. Functional and spectroscopic analysis of the gating transition provides direct insight into the allosteric coupling between the activation gate and the selectivity filter. We show that the movement of the inner gate helix is transmitted to the C-terminus as a straightforward expansion, leading to an upward movement and the insertion of the top third of the bulge helix into the membrane. We suggest that by limiting the extent to which the inner gate can open, the cytoplasmic domain also modulates the level of inactivation occurring at the selectivity filter.
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Mechanism of activation gating in the full-length KcsA K+ channel.,Uysal S, Cuello LG, Cortes DM, Koide S, Kossiakoff AA, Perozo E Proc Natl Acad Sci U S A. 2011 Jul 5. PMID:21730186<ref>PMID:21730186</ref>
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From MEDLINE&reg;/PubMed&reg;, a database of the U.S. National Library of Medicine.<br>
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</div>
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<div class="pdbe-citations 3pjs" style="background-color:#fffaf0;"></div>
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==See Also==
==See Also==
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*[[Potassium Channel|Potassium Channel]]
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*[[Antibody 3D structures|Antibody 3D structures]]
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*[[3D structures of antibody|3D structures of antibody]]
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*[[Potassium channel 3D structures|Potassium channel 3D structures]]
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*[[3D structures of non-human antibody|3D structures of non-human antibody]]
== References ==
== References ==
<references/>
<references/>
__TOC__
__TOC__
</StructureSection>
</StructureSection>
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[[Category: Actinomyces lividans krasil'nikov et al. 1965]]
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[[Category: Large Structures]]
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[[Category: Lk3 transgenic mice]]
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[[Category: Mus musculus]]
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[[Category: Cuello, L G]]
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[[Category: Streptomyces lividans]]
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[[Category: Kossiakoff, A]]
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[[Category: Cuello LG]]
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[[Category: Perozo, E]]
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[[Category: Kossiakoff A]]
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[[Category: Uysal, S]]
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[[Category: Perozo E]]
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[[Category: Cell membrane]]
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[[Category: Uysal S]]
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[[Category: Conducts k+ ion]]
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[[Category: Ion channel]]
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[[Category: Transport protein]]
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Current revision

Mechanism of Activation Gating in the Full-Length KcsA K+ Channel

PDB ID 3pjs

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