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• W1586672231 abstract "The enzyme tissue-type plasminogen activator (t-PA) and its substrate Glu-plasminogen can both bind to fibrin. The assembly of these three components results in about a 1000-fold acceleration of the conversion of Glu-plasminogen into plasmin. Fibrin binding of t-PA is mediated both by its finger (F) domain and its kringle-2 domain. Fibrin binding of Glu-plasminogen involves its kringle structures (K1-K5). It has been suggested that particular kringles contain lysine-binding sites and/or aminohexyl-binding sites, exhibiting affinity for specific carboxyl-terminal lysines and intrachain lysines, respectively. We investigated the possibility that t-PA and Glu-plasminogen kringles share common binding sites in fibrin, limitedly digested with plasmin. For that purpose we performed competition experiments, using conditions that exclude plasmin formation, with Glu-plasminogen and either t-PA or two deletion mutants, lacking the F domain (t-PA del.F) or lacking the K2 domain (t-PA del.K2). Our data show that fibrin binding of t-PA, mediated by the F domain, is independent of Glu-plasminogen binding. In contrast, partial inhibition by Glu-plasminogen of t-PA K2 domain-mediated fibrin binding is observed that is dependent on carboxyl-terminal lysines, exposed in fibrin upon limited plasmin digestion. Half-maximal competition of fibrin binding of both t-PA and t-PA del.F is obtained at 3.3 microM Glu-plasminogen. The difference between this value and the apparent dissociation constant of Glu-plasminogen binding to limitedly digested fibrin (12.1 microM) under these conditions is attributed to multiple, simultaneous interactions, each having a separate affinity. It is concluded that t-PA and Glu-plasminogen can bind to the same carboxyl-terminal lysines in limitedly digested fibrin, whereas binding sites composed of intrachain lysines are unique both for the K2 domain of t-PA and the Glu-plasminogen kringles." @default.
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• W1586672231 date "1990-08-01" @default.
• W1586672231 modified "2023-09-30" @default.
• W1586672231 title "Tissue-type plasminogen activator and its substrate Glu-plasminogen share common binding sites in limited plasmin-digested fibrin." @default.
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• W1586672231 doi "https://doi.org/10.1016/s0021-9258(18)77382-1" @default.
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