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Infection and Immunity, September 2006, p. 5152-5160, Vol. 74, No. 9
0019-9567/06/$08.00+0     doi:10.1128/IAI.00484-06
Copyright © 2006, American Society for Microbiology. All Rights Reserved.

Legionella pneumophila Mip, a Surface-Exposed Peptidylproline cis-trans-Isomerase, Promotes the Presence of Phospholipase C-Like Activity in Culture Supernatants

Sruti DebRoy, Virginia Aragon, Sherry Kurtz, and Nicholas P. Cianciotto*

Department of Microbiology-Immunology, Northwestern University Medical School, Chicago, Illinois 60611

Received 24 March 2006/ Returned for modification 26 May 2006/ Accepted 13 June 2006

The type II secretion system of Legionella pneumophila promotes pathogenesis. Among the Legionella type II-dependent exoenzymes is a p-nitrophenol phosphorylcholine (p-NPPC) hydrolase whose activity is only partially explained by the PlcA phospholipase C. In a screen to identify other factors that promote secreted hydrolase activity, we isolated a mip mutant. L. pneumophila Mip is a surface-exposed, FK506-binding protein that is needed for optimal infection and has peptidylproline cis-trans-isomerase (PPIase) activity. Since the molecular target of Mip was undefined, we investigated a possible relationship between Mip and the secreted p-NPPC hydrolase activity. In the mip mutant there was a 40 to 70% reduction in secreted activity that was successfully complemented by providing mip on a plasmid. A similar phenotype was observed when we examined four other independently derived mip mutants, and in all cases the defect was complemented by reintroduction of mip. Thus, mip promotes the presence of a p-NPPC hydrolase activity in culture supernatants. We also found that the C terminus of Mip is required for this effect. When supernatants were examined by anion-exchange chromatography, the p-NPPC hydrolase activity associated with Mip proved to be type II dependent but distinct from PlcA. This conclusion was supported by the phenotype of a newly constructed mip plcA double mutant. Thus, Mip promotes the elaboration of a new type II exoprotein. These data provide both the first evidence for a target for Mip and the first indication that a surface PPIase is involved in the secretion or activation of proteins beyond the outer membrane.

* Corresponding author. Mailing address: Department of Microbiology-Immunology, Northwestern University Medical School, 320 East Superior Street, Chicago, IL 60611-3010. Phone: (312) 503-0385. Fax: (312) 503-1339. E-mail: n-cianciotto{at}northwestern.edu.

Editor: D. L. Burns

Infection and Immunity, September 2006, p. 5152-5160, Vol. 74, No. 9
0019-9567/06/$08.00+0     doi:10.1128/IAI.00484-06
Copyright © 2006, American Society for Microbiology. All Rights Reserved.



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