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TitleMechanism underlying delayed rectifying in human voltage-mediated activation Eag2 channel.
Journal, issue, pagesNat Commun, Vol. 14, Issue 1, Page 1470, Year 2023
Publish dateMar 16, 2023
AuthorsMingfeng Zhang / Yuanyue Shan / Duanqing Pei /
PubMed AbstractThe transmembrane voltage gradient is a general physico-chemical cue that regulates diverse biological function through voltage-gated ion channels. How voltage sensing mediates ion flows remains ...The transmembrane voltage gradient is a general physico-chemical cue that regulates diverse biological function through voltage-gated ion channels. How voltage sensing mediates ion flows remains unknown at the molecular level. Here, we report six conformations of the human Eag2 (hEag2) ranging from closed, pre-open, open, and pore dilation but non-conducting states captured by cryo-electron microscopy (cryo-EM). These multiple states illuminate dynamics of the selectivity filter and ion permeation pathway with delayed rectifier properties and Cole-Moore effect at the atomic level. Mechanistically, a short S4-S5 linker is coupled with the constrict sites to mediate voltage transducing in a non-domain-swapped configuration, resulting transitions for constrict sites of F464 and Q472 from gating to open state stabilizing for voltage energy transduction. Meanwhile, an additional potassium ion occupied at positions S6 confers the delayed rectifier property and Cole-Moore effects. These results provide insight into voltage transducing and potassium current across membrane, and shed light on the long-sought Cole-Moore effects.
External linksNat Commun / PubMed:36928654 / PubMed Central
MethodsEM (single particle)
Resolution3.4 - 3.8 Å
Structure data

EMDB-33855, PDB-7yid:
Human KCNH5 closed state 1
Method: EM (single particle) / Resolution: 3.4 Å

EMDB-33856, PDB-7yie:
Human KCNH5-closed state 2
Method: EM (single particle) / Resolution: 3.4 Å

EMDB-33857, PDB-7yif:
Human KCNH5 pre-open state 1
Method: EM (single particle) / Resolution: 3.5 Å

EMDB-33858, PDB-7yig:
Human KCNH5 pre-open state 2
Method: EM (single particle) / Resolution: 3.6 Å

EMDB-33859, PDB-7yih:
Human KCNH5 open state
Method: EM (single particle) / Resolution: 3.5 Å

EMDB-33860, PDB-7yij:
Human KCNH5 pore dilation but the non-conducting state
Method: EM (single particle) / Resolution: 3.8 Å

Chemicals

ChemComp-K:
Unknown entry

ChemComp-HOH:
WATER

Source
  • homo sapiens (human)
KeywordsMEMBRANE PROTEIN / Potassium Channel

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