Fine interaction profiling of VemP and mechanisms responsible for its translocation-coupled arrest-cancelation.

Abstract:

:Bacterial cells utilize monitoring substrates, which undergo force-sensitive translation elongation arrest, to feedback-regulate a Sec-related gene. Vibrio alginolyticus VemP controls the expression of SecD/F that stimulates a late step of translocation by undergoing export-regulated elongation arrest. Here, we attempted at delineating the pathway of the VemP nascent-chain interaction with Sec-related factors, and identified the signal recognition particle (SRP) and PpiD (a membrane-anchored periplasmic chaperone) in addition to other translocon components and a ribosomal protein as interacting partners. Our results showed that SRP is required for the membrane-targeting of VemP, whereas PpiD acts cooperatively with SecD/F in the translocation and arrest-cancelation of VemP. We also identified the conserved Arg-85 residue of VemP as a crucial element that confers PpiD-dependence to VemP and plays an essential role in the regulated arrest-cancelation. We propose a scheme of the arrest-cancelation processes of VemP, which likely monitors late steps in the protein translocation pathway.

journal_name

Elife

journal_title

eLife

authors

Miyazaki R,Akiyama Y,Mori H

doi

10.7554/eLife.62623

subject

Has Abstract

pub_date

2020-12-15 00:00:00

issn

2050-084X

pii

62623

journal_volume

9

pub_type

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