The 3.5-A CryoEM Structure of Nanodisc-Reconstituted Yeast Vacuolar ATPase V_o Proton Channel.

ABSTRACT: The molecular mechanism of transmembrane proton translocation in rotary motor ATPases is not fully understood. Here, we report the 3.5-Å resolution cryoEM structure of the lipid nanodisc-reconstituted V_o proton channel of the yeast vacuolar H⁺-ATPase, captured in a physiologically relevant, autoinhibited state. The resulting atomic model provides structural detail for the amino acids that constitute the proton pathway at the interface of the proteolipid ring and subunit a. Based on the structure and previous mutagenesis studies, we propose the chemical basis of transmembrane proton transport. Moreover, we discovered that the C terminus of the assembly factor Voa1 is an integral component of mature V_o. Voa1's C-terminal transmembrane α helix is bound inside

SUBMITTER: Roh SH 

PROVIDER: S-EPMC5893162 | biostudies-literature | 2018 Mar

REPOSITORIES: biostudies-literature