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. 1986 Dec 20;5(13):3525–3530. doi: 10.1002/j.1460-2075.1986.tb04678.x

Involvement of finger domain and kringle 2 domain of tissue-type plasminogen activator in fibrin binding and stimulation of activity by fibrin.

J H Verheijen, M P Caspers, G T Chang, G A de Munk, P H Pouwels, B E Enger-Valk
PMCID: PMC1167389  PMID: 3030730

Abstract

Human tissue-type plasminogen activator (t-PA) catalyses the conversion of inactive plasminogen into active plasmin, the main fibrinolytic enzyme. This process is confined to the fibrin surface by specific binding of t-PA to fibrin and stimulation of its activity by fibrin. Tissue-type plasminogen activator contains five domains designated finger, growth factor, kringle 1, kringle 2 and protease. The involvement of the domains in fibrin specificity was investigated with a set of variant proteins lacking one or more domains. Variant proteins were produced by expression in Chinese hamster ovary cells of plasmids containing part of the coding sequence for the activator. It was found that kringle 2 domain only is involved in stimulation of activity by fibrin. In the absence of plasminogen and at low concentration of fibrin, binding of t-PA is mainly due to the finger domain, while at high fibrin concentrations also kringle 2 is involved in fibrin binding. In the presence of plasminogen, fibrin binding of the kringle 2 region of t-PA also becomes important at low fibrin concentrations.

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