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Free Content Ng-MIP, a surface-exposed lipoprotein of Neisseria gonorrhoeae, has a peptidyl-prolyl cis/trans isomerase (PPIase) activity and is involved in persistence in macrophages

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Macrophage infectivity potentiators (MIPs) are a family of surface-exposed virulence factors of intracellular microorganisms such as Legionella, Chlamydia and Trypanosoma. These proteins display peptidyl-prolyl cis/trans isomerase (PPIase) activity that is inhibited by immunosuppressants FK506 and rapamycin. Here we describe the identification and characterization in Neisseria gonorrhoeae of Ng-MIP, a surface-exposed lipoprotein with high homology to MIPs. The protein is an homodimer with rapamycin-inhibited PPIase activity confirming that it is a functional member of the MIP family. A knock-out strain, generated by deletion of the mip gene in N. gonorrhoeae F62 strain, was evaluated for its role in infection of mouse and human macrophages. We show that Ng-MIP promotes the intracellular survival of N. gonorrhoeae in macrophages, highlighting a possible role of this protein in promoting the persistence of gonococcal infection.
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Document Type: Research Article

Affiliations: 1: IRIS, Chiron S.r.l., Via Fiorentina, 1, 53100 Siena, Italy. 2: C.I.M.E., University of Tuscia, 01100 Viterbo, Italy. 3: Max Planck Research Unit for Enzymology of Protein Folding, Weinbergweg 22, 06120, Halle/Saale, Germany.

Publication date: November 1, 2005

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