7np4: Difference between revisions
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==cAMP-bound rabbit HCN4 stabilized in LMNG-CHS detergent mixture== | ==cAMP-bound rabbit HCN4 stabilized in LMNG-CHS detergent mixture== | ||
<StructureSection load='7np4' size='340' side='right'caption='[[7np4]]' scene=''> | <StructureSection load='7np4' size='340' side='right'caption='[[7np4]], [[Resolution|resolution]] 3.30Å' scene=''> | ||
== Structural highlights == | == Structural highlights == | ||
<table><tr><td colspan='2'>Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=7NP4 OCA]. For a <b>guided tour on the structure components</b> use [https://proteopedia.org/fgij/fg.htm?mol=7NP4 FirstGlance]. <br> | <table><tr><td colspan='2'>Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=7NP4 OCA]. For a <b>guided tour on the structure components</b> use [https://proteopedia.org/fgij/fg.htm?mol=7NP4 FirstGlance]. <br> | ||
</td></tr><tr id='resources'><td class="sblockLbl"><b>Resources:</b></td><td class="sblockDat"><span class='plainlinks'>[https://proteopedia.org/fgij/fg.htm?mol=7np4 FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=7np4 OCA], [https://pdbe.org/7np4 PDBe], [https://www.rcsb.org/pdb/explore.do?structureId=7np4 RCSB], [https://www.ebi.ac.uk/pdbsum/7np4 PDBsum], [https://prosat.h-its.org/prosat/prosatexe?pdbcode=7np4 ProSAT]</span></td></tr> | </td></tr><tr id='method'><td class="sblockLbl"><b>[[Empirical_models|Method:]]</b></td><td class="sblockDat" id="methodDat">Electron Microscopy, [[Resolution|Resolution]] 3.3Å</td></tr> | ||
<tr id='ligand'><td class="sblockLbl"><b>[[Ligand|Ligands:]]</b></td><td class="sblockDat" id="ligandDat"><scene name='pdbligand=CMP:ADENOSINE-3,5-CYCLIC-MONOPHOSPHATE'>CMP</scene></td></tr> | |||
<tr id='resources'><td class="sblockLbl"><b>Resources:</b></td><td class="sblockDat"><span class='plainlinks'>[https://proteopedia.org/fgij/fg.htm?mol=7np4 FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=7np4 OCA], [https://pdbe.org/7np4 PDBe], [https://www.rcsb.org/pdb/explore.do?structureId=7np4 RCSB], [https://www.ebi.ac.uk/pdbsum/7np4 PDBsum], [https://prosat.h-its.org/prosat/prosatexe?pdbcode=7np4 ProSAT]</span></td></tr> | |||
</table> | </table> | ||
<div style="background-color:#fffaf0;"> | |||
== Publication Abstract from PubMed == | |||
The HCN1-4 channel family is responsible for the hyperpolarization-activated cation current If/Ih that controls automaticity in cardiac and neuronal pacemaker cells. We present cryoelectron microscopy (cryo-EM) structures of HCN4 in the presence or absence of bound cAMP, displaying the pore domain in closed and open conformations. Analysis of cAMP-bound and -unbound structures sheds light on how ligand-induced transitions in the channel cytosolic portion mediate the effect of cAMP on channel gating and highlights the regulatory role of a Mg(2+) coordination site formed between the C-linker and the S4-S5 linker. Comparison of open/closed pore states shows that the cytosolic gate opens through concerted movements of the S5 and S6 transmembrane helices. Furthermore, in combination with molecular dynamics analyses, the open pore structures provide insights into the mechanisms of K(+)/Na(+) permeation. Our results contribute mechanistic understanding on HCN channel gating, cyclic nucleotide-dependent modulation, and ion permeation. | |||
Gating movements and ion permeation in HCN4 pacemaker channels.,Saponaro A, Bauer D, Giese MH, Swuec P, Porro A, Gasparri F, Sharifzadeh AS, Chaves-Sanjuan A, Alberio L, Parisi G, Cerutti G, Clarke OB, Hamacher K, Colecraft HM, Mancia F, Hendrickson WA, Siegelbaum SA, DiFrancesco D, Bolognesi M, Thiel G, Santoro B, Moroni A Mol Cell. 2021 Jun 18. pii: S1097-2765(21)00446-9. doi:, 10.1016/j.molcel.2021.05.033. PMID:34166608<ref>PMID:34166608</ref> | |||
From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine.<br> | |||
</div> | |||
<div class="pdbe-citations 7np4" style="background-color:#fffaf0;"></div> | |||
==See Also== | |||
*[[Ion channels 3D structures|Ion channels 3D structures]] | |||
== References == | |||
<references/> | |||
__TOC__ | __TOC__ | ||
</StructureSection> | </StructureSection> | ||
Latest revision as of 11:57, 14 July 2024
cAMP-bound rabbit HCN4 stabilized in LMNG-CHS detergent mixturecAMP-bound rabbit HCN4 stabilized in LMNG-CHS detergent mixture
Structural highlights
Publication Abstract from PubMedThe HCN1-4 channel family is responsible for the hyperpolarization-activated cation current If/Ih that controls automaticity in cardiac and neuronal pacemaker cells. We present cryoelectron microscopy (cryo-EM) structures of HCN4 in the presence or absence of bound cAMP, displaying the pore domain in closed and open conformations. Analysis of cAMP-bound and -unbound structures sheds light on how ligand-induced transitions in the channel cytosolic portion mediate the effect of cAMP on channel gating and highlights the regulatory role of a Mg(2+) coordination site formed between the C-linker and the S4-S5 linker. Comparison of open/closed pore states shows that the cytosolic gate opens through concerted movements of the S5 and S6 transmembrane helices. Furthermore, in combination with molecular dynamics analyses, the open pore structures provide insights into the mechanisms of K(+)/Na(+) permeation. Our results contribute mechanistic understanding on HCN channel gating, cyclic nucleotide-dependent modulation, and ion permeation. Gating movements and ion permeation in HCN4 pacemaker channels.,Saponaro A, Bauer D, Giese MH, Swuec P, Porro A, Gasparri F, Sharifzadeh AS, Chaves-Sanjuan A, Alberio L, Parisi G, Cerutti G, Clarke OB, Hamacher K, Colecraft HM, Mancia F, Hendrickson WA, Siegelbaum SA, DiFrancesco D, Bolognesi M, Thiel G, Santoro B, Moroni A Mol Cell. 2021 Jun 18. pii: S1097-2765(21)00446-9. doi:, 10.1016/j.molcel.2021.05.033. PMID:34166608[1] From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine. See AlsoReferences
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