Thromb Haemost 2017; 117(06): 1058-1071
DOI: 10.1160/TH16-12-0936
Coagulation and Fibrinolysis
Schattauer GmbH

Mechanism of plasmin generation by S100A10

Victoria A. Miller
1  Department of Pathology, Dalhousie University, Halifax, Nova Scotia, Canada
,
Patricia A. Madureira
2  Centre for Biomedical Research (CBMR), University of Algarve, Campus of Gambelas, Faro, Portugal
,
Ain Adilliah Kamaludin
3  Department of Biochemistry & Molecular Biology, Dalhousie University, Halifax, Nova Scotia, Canada
,
Jeffrey Komar
3  Department of Biochemistry & Molecular Biology, Dalhousie University, Halifax, Nova Scotia, Canada
,
Vandna Sharma
4  Institute of Microbial Technology (C. S. I.R), Sector 39-A, Chandigarh, India
,
Girish Sahni
4  Institute of Microbial Technology (C. S. I.R), Sector 39-A, Chandigarh, India
,
Craig Thelwell
5  Haemostasis Section, Biotherapeutics Group, National Institute for Biological Standards and Control, South Mimms, Herts, UK
,
Colin Longstaff
5  Haemostasis Section, Biotherapeutics Group, National Institute for Biological Standards and Control, South Mimms, Herts, UK
,
1  Department of Pathology, Dalhousie University, Halifax, Nova Scotia, Canada
3  Department of Biochemistry & Molecular Biology, Dalhousie University, Halifax, Nova Scotia, Canada
› Author Affiliations
Financial support: This work was supported by a grant from the Heart and Stroke Foundation of Canada (G-14–0005821). PAM is currently supported by an FCT Investigator contract, ref: IF/00614/2014 from Fundação para a Ciência e a Tecnologia, Portugal and by national Portuguese funding through FCT – Fundação para a Ciência e a Tecnologia, project ref. UID/BIM/04773/2013 CBMR.
Further Information

Publication History

Received: 16 December 2016

Accepted after major revision: 19 March 2017

Publication Date:
07 November 2017 (online)

Summary

Plasminogen (Pg) is cleaved to form plasmin by the action of specific plasminogen activators such as the tissue plasminogen activator (tPA). Although the interaction of tPA and Pg with the surface of the fibrin clot has been well characterised, their interaction with cell surface Pg receptors is poorly understood. S100A10 is a cell surface Pg receptor that plays a key role in cellular plasmin generation. In the present report, we have utilised domain-switched/deleted variants of tPA, truncated plasminogen variants and S100A10 site-directed mutant proteins to define the regions responsible for S100A10-dependent plasmin generation. In contrast to the established role of the finger domain of tPA in fibrin-stimulated plasmin generation, we show that the kringle-2 domain of tPA plays a key role in S100A10-dependent plasmin generation. The kringle-1 domain of plasminogen, indispensable for fibrin-binding, is also critical for S100A10-dependent plasmin generation. S100A10 retains activity after substitution or deletion of the carboxyl-terminal lysine suggesting that internal lysine residues contribute to its plasmin generating activity. These studies define a new paradigm for plasminogen activation by the plasminogen receptor, S100A10.