Interaction of fibrin(ogen) with the endothelial cell receptor VE-cadherin: mapping of the receptor-binding site in the NH2-terminal portions of the fibrin beta chains

Biochemistry
Sergei Gorlatov, Leonid Medved

Abstract

Interaction of fibrin with endothelial cells stimulates capillary tube formation thus promoting angiogenesis. This interaction occurs via endothelial cell receptor VE-cadherin and fibrin beta chain 15-42 regions [Bach, T. L., et al. (1998) J. Biol. Chem. 272, 30719-30728]. To clarify the mechanism of this interaction, we expressed in Escherichia coli a number of recombinant fibrin(ogen) fragments containing the beta15-42 region or the VE-cad(1-2) and VE-cad(1-4) fragments encompassing two and four extracellular NH2-terminal domains of VE-cadherin, respectively, and tested interaction between them by surface plasmon resonance and ELISA. Neither the recombinant Bbeta1-57 or Bbeta1-64 fragments, nor beta15-57 or beta15-64 prepared from the latter fragments by thrombin treatment to remove fibrinopeptides B, bound the recombinant VE-cadherin fragments. At the same time, a dimeric recombinant thrombin-treated (beta15-66)2 fragment, which had been disulfide-linked via Cys65 to mimic the dimeric arrangement of the beta chains in fibrin, bound VE-cad(1-4) well, but not VE-cad(1-2); no binding was observed with the untreated (Bbeta1-66)2 dimer. We next mutated several residues in the dimer, His16, Arg17, Pro18, and Asp20, and tested the ...Continue Reading

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