Macrophage Infectivity Potentiator Mip Exhibits Peptidyl-Prolyl-cis/trans-Isomerase Activity, Binds Collagen IV and Enables Legionella pneumophila to Transmigrate Across Tissue Barriers

  • Michael Steinert
  • Can Ünal
Part of the Heat Shock Proteins book series (HESP, volume 7)


During human infection, Legionella pneumophila mainly replicates intracellularly within alveolar macrophages. In addition, the bacterial penetration of the alveolar epithelial barrier has a significant impact on the progress of Legionnaires´ disease. The macrophage infectivity potentiator (Mip) of L. pneumophila contributes to both the intracellular replication and the extracellular dissemination processes. Mip is exposed on the bacterial surface, exhibits peptidyl-prolyl-cis/trans-isomerase (PPIase) activity, and binds to the extracellular matrix (ECM) component collagen IV. Biochemical analyses revealed that the collagen-derived peptide P290 binds to a specific hydrophobic cavity of Mip, thus inhibiting bacterial epithelial transmigration in vitro. Based on NMR data and docking studies a model for the mode of interaction of P290 and Mip was developed. The present article focuses on Mip as a moonlighting protein with intra- and extracellular functions during L. pneumophila pathogenesis. Moreover, we discuss Mip-substrate based peptides as lead structures for anti-infective drug development.


Nuclear Magnetic Resonance Nuclear Magnetic Resonance Spectroscopy Peptide Array PPIase Activity Collagen Binding Protein 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.


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© Springer Science+Business Media Dordrecht 2013

Authors and Affiliations

  1. 1.Institut für MikrobiologieTechnische Universität BraunschweigBraunschweigGermany
  2. 2.Moleküler Biyoloji ve MikrobiyolojiTürk-Alman ÜniversitesiIstanbulTurkey

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