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Structural insights into chaperone addiction of toxin-antitoxin systems.

Abstract：

:SecB chaperones assist protein export by binding both unfolded proteins and the SecA motor. Certain SecB homologs can also control toxin-antitoxin (TA) systems known to modulate bacterial growth in response to stress. In such TA-chaperone (TAC) systems, SecB assists the folding and prevents degradation of the antitoxin, thus facilitating toxin inhibition. Chaperone dependency is conferred by a C-terminal extension in the antitoxin known as chaperone addiction (ChAD) sequence, which makes the antitoxin aggregation-prone and prevents toxin inhibition. Using TAC of Mycobacterium tuberculosis, we present the structure of a SecB-like chaperone bound to its ChAD peptide. We find differences in the binding interfaces when compared to SecB-SecA or SecB-preprotein complexes, and show that the antitoxin can reach a functional form while bound to the chaperone. This work reveals how chaperones can use discrete surface binding regions to accommodate different clients or partners and thereby expand their substrate repertoire and functions.

journal_name

Nat Commun

journal_title

Nature communications

authors

Guillet V,Bordes P,Bon C,Marcoux J,Gervais V,Sala AJ,Dos Reis S,Slama N,Mares-Mejía I,Cirinesi AM,Maveyraud L,Genevaux P,Mourey L

doi

10.1038/s41467-019-08747-4

subject

Has Abstract

pub_date

2019-02-15 00:00:00

pages

782

issue

1

issn

2041-1723

pii

10.1038/s41467-019-08747-4

journal_volume

10

pub_type

杂志文章

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