Mechanical inhibition of isolated Vo from V/A-ATPase for proton conductance.

Abstract:

:V-ATPase is an energy converting enzyme, coupling ATP hydrolysis/synthesis in the hydrophilic V1 domain, with proton flow through the Vo membrane domain, via rotation of the central rotor complex relative to the surrounding stator apparatus. Upon dissociation from the V1 domain, the Vo domain of the eukaryotic V-ATPase can adopt a physiologically relevant auto-inhibited form in which proton conductance through the Vo domain is prevented, however the molecular mechanism of this inhibition is not fully understood. Using cryo-electron microscopy, we determined the structure of both the holo V/A-ATPase and isolated Vo at near-atomic resolution, respectively. These structures clarify how the isolated Vo domain adopts the auto-inhibited form and how the holo complex prevents formation of the inhibited Vo form.

journal_name

Elife

journal_title

eLife

authors

Kishikawa JI,Nakanishi A,Furuta A,Kato T,Namba K,Tamakoshi M,Mitsuoka K,Yokoyama K

doi

10.7554/eLife.56862

subject

Has Abstract

pub_date

2020-07-08 00:00:00

issn

2050-084X

pii

56862

journal_volume

9

pub_type

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