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Updated: Aug 15, 2026

Monitoring the Assembly of a Secreted Bacterial Virulence Factor Using Site-specific Crosslinking
Published on: December 17, 2013
Subcomplexes from the Xcp secretion system of Pseudomonas aeruginosa
Viviane Robert1, Alain Filloux, Gérard P F Michel
1Laboratoire d'Ingénierie des Systèmes Macromoléculaires, Institut de Biologie Structurale et Microbiologie, 13402 Marseille Cedex 20, France.
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.
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