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- W2022372977 abstract "Conversion of fibrinogen into fibrin results in the exposure of cryptic interaction sites and modulation of various activities. To elucidate the mechanism of this exposure, we tested the accessibility of the Aalpha148-160 and gamma312-324 fibrin-specific epitopes that are involved in binding of plasminogen and its activator tPA, in several fragments derived from fibrinogen (fragment D and its subfragments) and fibrin (cross-linked D-D fragment and its noncovalent complex with the E(1) fragment, D-D. E(1)). Neither D nor D-D bound tPA, plasminogen, or anti-Aalpha148-160 and anti-gamma312-324 monoclonal antibodies, indicating that their fibrin-specific epitopes were inaccessible. The Aalpha148-160 epitope became exposed only upon proteolytic removal of the beta- and gamma-modules from D. At the same time, both epitopes were accessible in the D-D.E(1) complex, indicating that the DD.E interaction resulted in their exposure. This exposure was reversible since the dissociation of the D-D.E(1) complex made the sites unavailable, while reconstitution of the complex made them exposed. The results indicate that upon fibrin assembly, driven primarily by the interaction between complementary sites of the D and E regions, the D regions undergo conformational changes that cause the exposure of their plasminogen- and tPA-binding sites. These changes may be involved in the regulation of fibrin assembly and fibrinolysis." @default.
- W2022372977 created "2016-06-24" @default.
- W2022372977 creator A5003430489 @default.
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- W2022372977 date "2000-11-23" @default.
- W2022372977 modified "2023-09-27" @default.
- W2022372977 title "Conversion of Fibrinogen to Fibrin: Mechanism of Exposure of tPA- and Plasminogen-Binding Sites" @default.
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- W2022372977 doi "https://doi.org/10.1021/bi001847a" @default.
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