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Biochem Biophys Res Commun. 2005 Jun 17;331(4):1413-20.

Legionella pneumophila Philadelphia-1 tatB and tatC affect intracellular replication and biofilm formation.

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Laboratory of Bacteriology, Rega Institute for Medical Research, Katholieke Universiteit Leuven, Minderbroedersstraat 10, B-3000 Louvain, Belgium.


Legionella pneumophila is a facultative intracellular human pathogen and an important cause of Legionnaires' disease, a severe form of pneumonia. Recently, we showed the presence of a putative twin-arginine translocation (Tat) pathway in L. pneumophila Philadelphia-1. This secretion pathway is used to transport completely folded proteins across the cytoplasmic membrane. The importance of the Tat pathway in L. pneumophila was investigated by constructing a tatB and a tatC mutant. Functionality of the Tat pathway was shown using a proven heterologous Tat substrate. It was shown that tatB and tatC are involved in intracellular replication in Acanthamoeba castellanii and differentiated U937 cells, and in biofilm forming ability. A putative Legionella Tat substrate was identified via 2D gel electrophoresis.

[Indexed for MEDLINE]

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