Mhp182 (P102) binds fibronectin and contributes to the recruitment of plasmin(ogen) to the Mycoplasma hyopneumoniae cell surface

Authors

Lisa M. Seymour, University of WollongongFollow
Cheryl Jenkins, Elizabeth Macarthur Agricultural Institute
Ania T. Deutscher, University of WollongongFollow
Benjamin B. A Raymond, The Ithree Institute
Matthew P. Padula, The Ithree Institute
Jessica L. Tacchi, The Ithree Institute
Daniel R. Bogema, University of WollongongFollow
Graeme J. Eamens, Elizabeth Macarthur Agricultural Institute
Lauren K. Woolley, The ithree Institute
Nicholas E. Dixon, University of WollongongFollow
Mark J. Walker, University of WollongongFollow
Steven P. Djordjevic, Elizabeth Macarthur Agricultural Institute

RIS ID

45082

Publication Details

Seymour, L. M., Jenkins, C., Deutscher, A. T., Raymond, B. B. A., Padula, M. P., Tacchi, J. L., Bogema, D. R., Eamens, G. J., Woolley, L. K., Dixon, N. E., Walker, M. J. & Djordjevic, S. P. (2012). Mhp182 (P102) binds fibronectin and contributes to the recruitment of plasmin(ogen) to the Mycoplasma hyopneumoniae cell surface. Cellular Microbiology, 14 (1), 81-94.

Abstract

Mycoplasma hyopneumoniae is a major, economically damaging respiratory pathogen. Although M. hyopneumoniae cells bind plasminogen, the identification of plasminogen-binding surface proteins and the biological ramifications of acquiring plasminogen requires further investigation. mhp182 encodes a highly expressed 102 kDa protein (P102) that undergoes proteolytic processing to generate surface-located N-terminal 60 kDa (P60) and C-terminal 42 kDa (P42) proteins of unknown function. We show that recombinant P102 (rP102) binds plasminogen at physiologically relevant concentrations (KD ~ 76 nM) increasing the susceptibility of plasmin(ogen) to activation by tissue-specific plasminogen activator (tPA). Recombinant proteins constructed to mimic P60 (rP60) and P42 (rP42) also bound plasminogen at physiologically significant levels. M. hyopneumoniae surface-bound plasminogen was activated by tPA and is able to degrade fibrinogen, demonstrating the biological functionality of M. hyopneumoniae-bound plasmin(ogen) upon activation. Plasmin(ogen) was readily detected in porcine ciliated airways and plasmin levels were consistently higher in bronchoalveolar lavage fluid from M. hyopneumoniae-infected animals. Additionally, rP102 and rP42 bind fibronectin with KDs of 26 and 33 nM respectively and recombinant P102 proteins promote adherence to porcine kidney epithelial-like cells. The multifunctional binding ability of P102 and activation of M. hyopneumoniae-sequestered plasmin(ogen) by an exogenous activator suggests P102 plays an important role in virulence.