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• W2106000878 abstract "Two murine monoclonal antibodies (MA-2G6 and MA-1C8), secreted by hybridomas obtained by fusion of myeloma cells with spleen cells from mice immunized with human tissue-type plasminogen activator (t-PA), inhibited the activity of t-PA on fibrin plates. MA-2G6 inhibited the amidolytic activity of t-PA and did not react with t-PA in which the active-site serine was blocked with diisopropylfluorophosphate nor with t-PA in which the active-site histidine was alkylated by reaction with d-Ile-Pro-Arg-CH2Cl. This indicated that MA-2G6 is directed against an epitope covering the active site of t-PA. MA-1C8 did not inhibit the amidolytic activity of t-PA, but abolished both the binding of t-PA to fibrin and the stimulatory effect of fibrin on the activation of plasminogen by t-PA. Thus MA-1C8 is directed against an epitope which covers the fibrin-binding site of t-PA. The A and B chains of partially reduced two-chain t-PA were separated by immunoadsorption on immobilized MA-1C8 and MA-2G6. The purified B chain reacted with MA-2G6 but not with MA-1C8 and activated plasminogen following Michaelis-Menten kinetics with kinetic constants similar to those of intact t-PA (Km= 100 μM and kcat= 0.02 s−1). However, fibrin or CNBr-digested fibrinogen did not stimulate the activation of plasminogen by the B chain. The purified A chain reacted with MA-1C8 but not with MA-2G6. It bound to fibrin with an affinity similar to that of intact t-PA but did not activate plasminogen. It is concluded that the active center of t-PA is located in the B chain and the fibrin-binding site in the A-chain. Both functional domains are required for the regulation by fibrin of the t-PA-mediated activation of plasminogen." @default.
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• W2106000878 date "1986-07-01" @default.
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• W2106000878 title "Characterization of functional domains in human tissue-type plasminogen activator with the use of monoclonal antibodies" @default.
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• W2106000878 doi "https://doi.org/10.1111/j.1432-1033.1986.tb09735.x" @default.
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