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Previous experiments had shown that the free N-terminal fibronectin 30-kDa-domain mediates binding of soluble 125I-fibrin to transamidase-coated polystyrene beads (Hörmann et al., Biol. Chem. Hoppe-Seyler 368, 669-674, 1987). Now, the formation of covalent adducts of the N-terminal fragment with fibrin peptide chains is demonstrated. Binding of soluble 125I-fibrin was performed in presence of N-terminal fibronectin 30-kDa or 70-kDa fragments. The material adsorbed was removed from the beads under reducing conditions and analysed by dodecylsulfate gel electrophoresis followed by autoradiography. The 30-kDa fragment gave rise to bands of 80 kDa and 180-200 kDa which were lacking in the products of the 70-kDa compound. Instead, they showed bands at 120 kDa and ca. 280 kDa. Evidently, those bands represented covalent adducts of fibrin peptide chains or their dimers with the 30-kDa or the 70-kDa fragment, respectively. In addition, dimeric gamma-chains and alpha-chain polymers of fibrin were present indicating partial polymerization of bead-attached fibrin.

biological chemistry hoppe-seyler

Immobilization of Soluble Fibrin on Factor XIIIa-Coated Polystyrene Beads Mediated by N-Terminal Fibronectin Fragments. II. Demonstration of Covalent Adducts of Fibrin Peptide Chains and Fibronectin Fragments