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DOI: 10.1160/TH05-05-0369
The nine residue plasminogen-binding motif of the pneumococcal enolase is the major cofactor of plasmin-mediated degradation of extracellular matrix, dissolution of fibrin and transmigration
Grant support: This work was supported in part by the Deutsche Forschungsgemeinschaft to S. Hammerschmidt (Sonderforschungsbereich Grant 479-A7), M. Rohde (DFG-Ro 2407/1), and the Bundesministerium für Bildung und Forschung to S. Hammerschmidt (BMBF-CAPNETZ C8).Publikationsverlauf
Received: 27. Mai 2005
Accepted after major revision: 01. Juli 2005
Publikationsdatum:
05. Dezember 2017 (online)
![](https://www.thieme-connect.de/media/10.1055-s-00035024/200502/lookinside/thumbnails/10-1160-th05-05-0369-1.jpg)
Summary
The glycolytic enzyme α-enolase represnts one of the nonclassical cell surface plasminogen-binding proteins of Streptococcus pneumoniae. In this study we investigated the impact of an internal plasminogen-binding motif of enolase on degradation of extracellular matrix and pneumococcal transmigration. In the presence of host-derived plasminogen activators (PA) tissuetype PA or urokinase PA and plasminogen S. pneumoniae expressing wild-type enolase efficiently degraded Matrigel or extracellular matrix (ECM). In contrast, amino acid substitutions in the nine residue plasminogen-binding motif of enolase significantly reduced degradation of ECM or Matrigel by mutated pneumococci. Similarly, recombinant wild-type enolase but not a mutated enolase derivative that lacks plasminogen-binding activity efficiently degraded ECM and Matrigel, respectively. In particular, bacterial cell enolase-bound plasmin potentiated dissolution of fibrin or laminin and transmigration of pneumococci through a fibrin matrix. In conclusion, these results provide evidence that the enolase is the major plasminogen-binding protein of pneumococci and that the nine residue plasminogen-binding motif of enolase is the key cofactor for plasmin-mediated pneumococcal degradation and transmigration through host ECM.
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