Role of the membrane localization domain of the Pseudomonas aeruginosa effector protein ExoU in cytotoxicity.

Abstract:

:ExoU is a potent effector protein that causes rapid host cell death upon injection by the type III secretion system of Pseudomonas aeruginosa. The N-terminal half of ExoU contains a patatin-like phospholipase A(2) (PLA(2)) domain that requires the host cell cofactor superoxide dismutase 1 (SOD1) for activation, while the C-terminal 137 amino acids constitute a membrane localization domain (MLD). Previous studies had utilized insertion and deletion mutations to show that portions of the MLD are required for membrane localization and catalytic activity. Here we further characterize this domain by identifying six residues that are essential for ExoU activity. Substitutions at each of these positions resulted in abrogation of membrane targeting, decreased ExoU-mediated cytotoxicity, and reductions in PLA(2) activity. Likewise, each of the six MLD residues was necessary for full virulence in cell culture and murine models of acute pneumonia. Purified recombinant ExoU proteins with substitutions at five of the six residues were not activated by SOD1, suggesting that these five residues are critical for activation by this cofactor. Interestingly, these same five ExoU proteins were partially activated by HeLa cell extracts, suggesting that a host cell cofactor other than SOD1 is capable of modulating the activity of ExoU. These findings add to our understanding of the role of the MLD in ExoU-mediated virulence.

journal_name

Infect Immun

journal_title

Infection and immunity

authors

Veesenmeyer JL,Howell H,Halavaty AS,Ahrens S,Anderson WF,Hauser AR

doi

10.1128/IAI.00223-10

subject

Has Abstract

pub_date

2010-08-01 00:00:00

pages

3346-57

issue

8

eissn

0019-9567

issn

1098-5522

pii

IAI.00223-10

journal_volume

78

pub_type

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