Actin activates Pseudomonas aeruginosa ExoY nucleotidyl cyclase toxin and ExoY-like effector domains from MARTX toxins.

Abstract:

:The nucleotidyl cyclase toxin ExoY is one of the virulence factors injected by the Pseudomonas aeruginosa type III secretion system into host cells. Inside cells, it is activated by an unknown eukaryotic cofactor to synthesize various cyclic nucleotide monophosphates. ExoY-like adenylate cyclases are also found in Multifunctional-Autoprocessing Repeats-in-ToXin (MARTX) toxins produced by various Gram-negative pathogens. Here we demonstrate that filamentous actin (F-actin) is the hitherto unknown cofactor of ExoY. Association with F-actin stimulates ExoY activity more than 10,000 fold in vitro and results in stabilization of actin filaments. ExoY is recruited to actin filaments in transfected cells and alters F-actin turnover. Actin also activates an ExoY-like adenylate cyclase MARTX effector domain from Vibrio nigripulchritudo. Finally, using a yeast genetic screen, we identify actin mutants that no longer activate ExoY. Our results thus reveal a new sub-group within the class II adenylyl cyclase family, namely actin-activated nucleotidyl cyclase (AA-NC) toxins.

journal_name

Nat Commun

journal_title

Nature communications

authors

Belyy A,Raoux-Barbot D,Saveanu C,Namane A,Ogryzko V,Worpenberg L,David V,Henriot V,Fellous S,Merrifield C,Assayag E,Ladant D,Renault L,Mechold U

doi

10.1038/ncomms13582

subject

Has Abstract

pub_date

2016-12-05 00:00:00

pages

13582

issn

2041-1723

pii

ncomms13582

journal_volume

7

pub_type

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