Binding of plasminogen to Escherichia coli adhesion proteins

FEBS Letters

Korhonen, Timo K.¹  Parkkinen, Jaakko² 

[1] Department of General Microbiology, University of Helsinki, Helsinki, Finland;Department of Gynecology and Obstetrics, University Central Hospital and Department of Medical Chemistry, University of Helsinki, Helsinki, Finland

关键词: Plasminogen;    Bacterial adhesin;    (E. coli);    IgG;    immunoglobulin G;    EACA;    ϵ-aminocaproic acid (6-aminohexanoic acid);    PBS;    phosphate-buffered saline;    BSA;    bovine serum albumin;   

DOI  :  10.1016/0014-5793(89)80772-0

学科分类：生物化学/生物物理

来源: John Wiley & Sons Ltd.

【 摘 要 】

Immobilization of plasminogen via its lysine-binding sites is regarded as a prerequisite for its activation and function in fibrinolysis and pericellular proteolysis. In the present study, the interaction of plasminogen with fimbriae found on Escherichia coli strains causing invasive human infections was studied. Plasminogen displayed concentration-dependent and saturable binding to immobilized type 1 fimbriae and, several fold lower binding to P and S fimbriae. The binding to fimbriae was effectively inhibited by ε-aminocaproic acid indicating that it was mediated by the lysine-binding sites of plasminogen. Binding studies with mutated fimbriae and inhibition tests indicated that the interaction was not dependent on the lectin subunit of the fimbriae. These results indicate the existence of a novel type of host-microbe interaction which may be important in the invasion by bacteria of host tissues.

【 授权许可】

Unknown