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JBC, Vol. 250, Issue 15, 5808-5817, Aug, 1975

Primary structure of human fibrinogen and fibrin. Isolation and partial characterization of chains of fragment D

D. Collen, B. Kudryk, B. Hessel and B. Blomback

Fragment D has been isolated as an apparently single molecular weight species (molecular weight about 100,000) from plasmin digests of humman fibrinogen, using a combination of affinity chromatography on insolubilized "fibrin monomer" and gel filtration. This fragment consists of three chains with molecular weights of 15,000 (Dbeta), 42,500 (Dgamma1) or 39,500 (Dgamma2), and 14,000 (Dalpha) held together by disulfide bonds. The S-carboxymethyl derivatives of the chains have been separated by gel filtration and ion exchange chromatography, and their identity has been confirmed by peptide mapping and immunological analysis. The chain with a molecular weight of 45,000 is a fragment of the Bbeta chain of fibrinogen. The chain derived from the gamma chain of fibrinogen occurred in two molecular forms having molecular weight 42,500 and 39,500. The chain derivative with molecular weight 14,000 is most likely derived from the Aalpha chain of fibrinogen. The chains were characterized by NH2-terminal sequence analysis, amino acid composition, and carbohydrate staining. The two molecular analysis, amino acid composition, and carbohydrate staining. The two molecular forms of the gamma chain appeared to be identical except for an NH2-terminal peptide extension of 23 amino acid residues in the longer chain. The latter has sequences in common with the COOH-terminal part of the gamma chain of the NH2-terminal disulfide knot (BROMBACK, B., BRONDAHL, N. J., HESSEL, B., IWANAGA, S., and WALLEN, P. (1973) J. Biol. Chem. 248, 5806-5820); its NH2-terminal residue being Ala-63 of the gamma chain of fibrinogen.
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