title: Subcomplexes from the Xcp secretion system of Pseudomonas aeruginosa.
abstract: In Gram-negative bacteria, most of the sec-dependent exoproteins are secreted via the type II secretion system (T2SS or secreton). In Pseudomonas aeruginosa, T2SS consists of 12 Xcp proteins (XcpA and XcpP to XcpZ) organized as a multiproteic complex within the envelope. In this study, by a co-purification approach using a His-tagged XcpZ as a bait, XcpY and XcpZ were found associated together to constitute the most stable functional unit so far isolated from the P. aeruginosa secreton. This subcomplex was also found to interact with XcpR and XcpS to form a XcpRSYZ complex which was isolated under native conditions. Another component, XcpP was not found to be associated to the complex but the results suggest that it can transiently interact with the XcpYZ subcomplex in vivo.
authors.affiliation: Laboratoire d'Ingénierie des Systèmes Macromoléculaires, Institut de Biologie Structurale et Microbiologie, 13402 Marseille Cedex 20, France.
authors.forename: Viviane
authors.initials: V
authors.lastname: Robert
authors.forename: Alain
authors.initials: A
authors.lastname: Filloux
authors.forename: Gérard P F
authors.initials: GP
authors.lastname: Michel
mesh_terms: D001426:Bacterial Proteins / Q000235:genetics / Q000302:isolation & purification / Q000378:metabolism*; D002846:Chromatography, Affinity; D003470:Culture Media; D015964:Gene Expression Regulation, Bacterial; D006801:Humans; D008565:Membrane Proteins / Q000235:genetics / Q000302:isolation & purification / Q000378:metabolism*; D011550:Pseudomonas aeruginosa / Q000235:genetics / Q000254:growth & development / Q000378:metabolism*
chemical_list: D001426:Bacterial Proteins; D003470:Culture Media; D008565:Membrane Proteins; C066762:xcpZ protein, Pseudomonas aeruginosa