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Laboratoire d'Ingénierie des Systèmes Macromoléculaires, UPR9027, IBSM/CNRS, 31 Chemin Joseph Aiguier, 13402 Marseille Cedex 20, France
ABSTRACT
Summary: Protein secretion in Gram-negative bacteria is often dependent on the general secretory pathway (GSP). In Pseudomonas aeruginosa, this system requires at least 12 Xcp (Gsp) proteins, which are proposed to constitute a multiprotein complex localized in the bacterial envelope. Hitherto, little was known about the mutual interactions between Xcp proteins. In this study, mutants affected in the xcpZ gene encoding a bitopic inner-membrane protein were analysed to investigate the role of this protein in the architecture of the secretory machinery. The absence of XcpZ resulted in a decreased amount of XcpY. Reciprocally, XcpZ was not detectable in a xcpY mutant demonstrating a mutual stabilization of these two proteins. These results strongly suggest that XcpZ and XcpY interact within the functional secretory apparatus.
Author for correspondence: Gerard Michel. Tel: +33 491164487. Fax: +33 491712124. e-mail: michel@ibsm.cnrs-mrs.fr
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