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Infection and Immunity, August 2004, p. 4741-4750, Vol. 72, No. 8
0019-9567/04/$08.00+0     DOI: 10.1128/IAI.72.8.4741-4750.2004
Copyright © 2004, American Society for Microbiology. All Rights Reserved.

The V Antigen of Pseudomonas aeruginosa Is Required for Assembly of the Functional PopB/PopD Translocation Pore in Host Cell Membranes

Julien Goure,1 Alexandrine Pastor,1 Eric Faudry,1 Jacqueline Chabert,1 Andréa Dessen,2 and Ina Attree1*

Biochimie et Biophysique des Systèmes Intégrés (UMR 5092 CNRS/CEA/UJF), DRDC, CEA,1 Laboratoire de Cristallographie Macromoléculaire (LCM), Institut de Biologie Structurale Jean-Pierre Ebel, Grenoble, France2

Received 14 January 2004/ Returned for modification 19 February 2004/ Accepted 27 April 2004

Pseudomonas aeruginosa efficiently intoxicates eukaryotic cells through the activity of the type III secretion-translocation system (TTSS). Gene deletions within the translocation operon pcrGVH-popBD abolish pore-forming activity of P. aeruginosa strains with macrophages and TTSS-dependent hemolysis. Here we investigated the requirements for PcrV, PopB, and PopD in pore formation by analyzing specific mutants using red blood cells (RBCs) and fibroblasts expressing green fluorescent protein fused to actin. Simultaneous secretion of three proteins, PopB, PopD, and PcrV, was required to achieve wild-type hemolysis and effector translocation. Deletion of pcrV in a cytotoxic strain did not affect secretion of PopB and PopD but abolished hemolytic activity and translocation of effectors into fibroblasts. Notably, the PcrV-deficient mutant was not capable of inserting PopD into host cell membranes, whereas PopB and PopD, but not PcrV, were readily found within membranes of wild-type-infected RBCs. Immunoprecipitation experiments performed by using a liposome model of pore assembly revealed a direct interaction between PopD and PopB but not between PopD and PcrV. Consequently, PcrV is necessary for the functional assembly of the PopB/D translocon complex but does not interact directly with pore-forming Pop proteins.

* Corresponding author. Mailing address: DRDC/BBSI, CEA Grenoble, 17 rue des Martyrs, 38054 Grenoble cedex 09, France. Phone: 33 438783483. Fax: 33 438784499. E-mail: iattreedelic{at}cea.fr.

Editor: J. T. Barbieri

Infection and Immunity, August 2004, p. 4741-4750, Vol. 72, No. 8
0019-9567/04/$08.00+0     DOI: 10.1128/IAI.72.8.4741-4750.2004
Copyright © 2004, American Society for Microbiology. All Rights Reserved.



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