The (DD)E complex is maintained by a composite fibrin polymerization site

Biochemistry
K A Moskowitz, A Z Budzynski

Abstract

The (DD)E complex is the major cross-linked fibrin degradation fragment. Structural components required for maintenance of the (DD)E complex were examined in order to better understand clot structure and the contribution of specific polypeptide chain segments in the process of polymerization. First, the (DD)E complex was reversibly dissociated by peptides derived from the alpha-chain NH2-terminus of fibrin having a minimal sequence of GPR (alpha 17-19). In addition, the complex was partially dissociated by peptide beta 40-54, while beta 50-55 and peptides derived from the fibrin beta-chain NH2-terminus had no effect. Second, monoclonal antibody (mAb) 1B6, specific for the alpha-chain NH2-terminus of fibrin, reacted rapidly with fragment E1, but did not recognize the corresponding epitope on the (DD)E complex. On the other hand, mAb 59D8, specific for GHRPL at the beta-chain NH2-terminus of fibrin, reacted with the (DD)E complex in a dose-dependent manner. Third, the (DD)E complex was irreversibly dissociated by proteolytic cleavage of fragment E1 by either thrombin, which removed GPR from the alpha-chain NH2-terminus, or Crotalus atrox protease III, which released beta 15-42. It has been concluded that fragment E1 contains a co...Continue Reading

Citations

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