MenT nucleotidyltransferase toxins extend tRNA acceptor stems and can be inhibited by asymmetrical antitoxin binding - Institut de Pharmacologie et de Biologie Structurale Accéder directement au contenu
Article Dans Une Revue Nature Communications Année : 2023

MenT nucleotidyltransferase toxins extend tRNA acceptor stems and can be inhibited by asymmetrical antitoxin binding

Résumé

Mycobacterium tuberculosis, the bacterium responsible for human tuberculosis, has a genome encoding a remarkably high number of toxin-antitoxin systems of largely unknown function. We have recently shown that the M. tuberculosis genome encodes four of a widespread, MenAT family of nucleotidyltransferase toxin-antitoxin systems. In this study we characterize MenAT1, using tRNA sequencing to demonstrate MenT1 tRNA modification activity. MenT1 activity is blocked by MenA1, a short protein antitoxin unrelated to the MenA3 kinase. X-ray crystallographic analysis shows blockage of the conserved MenT fold by asymmetric binding of MenA1 across two MenT1 protomers, forming a heterotrimeric toxin-antitoxin complex. Finally, we also demonstrate tRNA modification by toxin MenT4, indicating conserved activity across the MenT family. Our study highlights variation in tRNA target preferences by MenT toxins, selective use of nucleotide substrates, and diverse modes of MenA antitoxin activity.
Fichier principal
Vignette du fichier
41467_2023_Article_40264.pdf (3.77 Mo) Télécharger le fichier
Origine Fichiers éditeurs autorisés sur une archive ouverte

Dates et versions

hal-04240113 , version 1 (13-10-2023)

Identifiants

Citer

Xibing Xu, Ben Usher, Claude Gutierrez, Roland Barriot, Tom J Arrowsmith, et al.. MenT nucleotidyltransferase toxins extend tRNA acceptor stems and can be inhibited by asymmetrical antitoxin binding. Nature Communications, 2023, 14 (1), pp.4644. ⟨10.1038/s41467-023-40264-3⟩. ⟨hal-04240113⟩
42 Consultations
15 Téléchargements

Altmetric

Partager

Gmail Mastodon Facebook X LinkedIn More