Photorhabdus antibacterial Rhs polymorphic toxin inhibits translation through ADP-ribosylation of 23S ribosomal RNA - Aix-Marseille Université Access content directly
Journal Articles Nucleic Acids Research Year : 2021

Photorhabdus antibacterial Rhs polymorphic toxin inhibits translation through ADP-ribosylation of 23S ribosomal RNA

Abstract

Bacteria have evolved sophisticated mechanisms to deliver potent toxins into bacterial competitors or into eukaryotic cells in order to destroy rivals and gain access to a specific niche or to hijack essential metabolic or signaling pathways in the host. Delivered effectors carry various activities such as nucleases, phospholipases, peptidoglycan hydrolases, enzymes that deplete the pools of NADH or ATP, compromise the cell division machinery, or the host cell cytoskeleton. Effectors categorized in the family of polymorphic toxins have a modular structure, in which the toxin domain is fused to additional elements acting as cargo to adapt the effector to a specific secretion machinery. Here we show that Photorhabdus laumondii, an entomopathogen species, delivers a polymorphic antibacterial toxin via a type VI secretion system. This toxin inhibits protein synthesis in a NAD+-dependent manner. Using a biotinylated derivative of NAD, we demonstrate that translation is inhibited through ADP-ribosylation of the ribosomal 23S RNA. Mapping of the modification further showed that the adduct locates on helix 44 of the thiostrepton loop located in the GTPase-associated center and decreases the GTPase activity of the EF-G elongation factor.
Fichier principal
Vignette du fichier
gkab608.pdf (2.81 Mo) Télécharger le fichier
Origin Publisher files allowed on an open archive

Dates and versions

hal-03336433 , version 1 (09-09-2021)

Licence

Identifiers

Cite

Dukas Jurėnas, Amaury Payelleville, Mohammad Roghanian, Kathryn Turnbull, Alain Givaudan, et al.. Photorhabdus antibacterial Rhs polymorphic toxin inhibits translation through ADP-ribosylation of 23S ribosomal RNA. Nucleic Acids Research, 2021, 49 (14), pp.8384-8395. ⟨10.1093/nar/gkab608⟩. ⟨hal-03336433⟩
120 View
137 Download

Altmetric

Share

Gmail Mastodon Facebook X LinkedIn More