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Two monoclonal antibodies (McAbs) against Aα chain’s C terminus offibrinogen (Fg) have been prepared and designated SZ-78 and SZ-79. Both theantigens in binding assay and immunoblot analysis showed that the two McAbs recognized the epitopes located in residues 549-560 of the Aαchain. The two McAbs couldaccelerate rate of fibrin polymer assembly both in the purified system and in the humanplasma. From the pictures of transmission electronmicroscope, the average diametersof the fibers increase significantly to an average diameters of 375 nm after incubationwith the McAbs, while it was only 75nm without addition of the McAbs. There were al-so more branchings of fibers with addition of McAbs. These observations demonstratethat the amino acid sequences ofα 549-560 in the COOH terminus of the Aα chain mayplay an important role in the assembly of a fibrin clot, presumably being involved in lat-eral aggregation of protofibrils. The preparation of the McAbs supplies a usuful probe for the investigation of the fun
Both monoclonal antibodies (McAbs) against Aα chain’s C terminus offibrinogen (Fg) have been prepared and designated SZ-78 and SZ-79. Both the antigen in binding assay and immunoblot analysis showed that the two McAbs recognized the epitopes located in residues 549-560 of the Aαchain. The two McAbs couldaccelerate rate of fibrin polymer assembly both in the purified system and in the humanplasma. From the pictures of transmission electronmicroscope, the average diameters of the fibers increase significantly to an average diameters of 375 nm after incubation with the McAbs, while It was only 75nm without addition of the McAbs. There were al-so more branchings of fibers with addition of McAbs. These observations demonstrate that the amino acid sequences of [alpha] 549-560 in the COOH terminus of the A [alpha] chain may play an important role in the assembly of a fibrin clot, presumably being involved in lat-eral aggregation of protofibrils. The preparation of the McAbs supplies a usuful probe for the i nvestigation of the fun