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 Communjournal_title
Nature communicationsauthors
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 Udoi
10.1038/ncomms13582subject
Has Abstractpub_date
2016-12-05 00:00:00pages
13582issn
2041-1723pii
ncomms13582journal_volume
7pub_type
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