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Inactivation of Lgt Allows Systematic Characterization of Lipoproteins from Listeria monocytogenes ^,

Maja Baumgärtner,^1, Uwe Kärst,¹ Birgit Gerstel,¹ Martin Loessner,² Jürgen Wehland,¹ and Lothar Jänsch^1*

Department of Cell Biology, Helmholtz Centre for Infection Research (HZI), Inhoffenstraße 7, D-38124 Braunschweig, Germany,¹ Institut für Lebensmittel-u. Ernährungswissenschaften, ETH-Zentrum, Schmelzbergstrasse 9, CH-8092 Zürich, Switzerland²

Received 5 July 2006/ Accepted 4 October 2006

Lipoprotein anchoring in bacteria is mediated by the prolipoprotein diacylglyceryl transferase (Lgt), which catalyzes the transfer of a diacylglyceryl moiety to the prospective N-terminal cysteine of the mature lipoprotein. Deletion of the lgt gene in the gram-positive pathogen Listeria monocytogenes (i) impairs intracellular growth of the bacterium in different eukaryotic cell lines and (ii) leads to increased release of lipoproteins into the culture supernatant. Comparative extracellular proteome analyses of the EGDe wild-type strain and the lgt mutant provided systematic insight into the relative expression of lipoproteins. Twenty-six of the 68 predicted lipoproteins were specifically released into the extracellular proteome of the lgt strain, and this proved that deletion of lgt is an excellent approach for experimental verification of listerial lipoproteins. Consequently, we generated lgt prfA double mutants to detect lipoproteins belonging to the main virulence regulon that is controlled by PrfA. Overall, we identified three lipoproteins whose extracellular levels are regulated and one lipoprotein that is posttranslationally modified depending on PrfA. It is noteworthy that in contrast to previous studies of Escherichia coli, we unambiguously demonstrated that lipidation by Lgt is not a prerequisite for activity of the lipoprotein-specific signal peptidase II (Lsp) in Listeria.

Published ahead of print on 13 October 2006.

Supplemental material for this article may be found at http://jb.asm.org/.

Present address: Institut für Medizinische Immunologie, Martin-Luther-Universität, Halle-Wittenberg, Magdeburger Str. 2, D-06097 Halle, Germany.

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