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. 1992 Jun 15;284(Pt 3):711–715. doi: 10.1042/bj2840711

Epitope mapping by cDNA expression of a monoclonal antibody which inhibits the binding of von Willebrand factor to platelet glycoprotein IIb/IIIa.

G Piétu 1, A S Ribba 1, G Chérel 1, D Meyer 1
PMCID: PMC1132596  PMID: 1377911

Abstract

In order to study the structure-function relationship of von Willebrand Factor (vWF), we have located the epitope of a well-characterized monoclonal antibody (MAb) to vWF (MAb 9). This MAb reacts with the C-terminal portion of the vWF subunit, SPII fragment [amino acids (aa) 1366-2050], which includes an Arg-Gly-Asp (RGD) sequence at positions 1744-1746, and totally inhibits vWF and SPII binding to platelet membrane glycoprotein IIb/IIIa (GPIIb/IIIa). A recombinant DNA library was constructed by cloning small (250-500 nucleotides) vWF cDNA fragments into the lambda gt11 vector and these inserts were expressed as fusion proteins with beta-galactosidase. Immunological screening of the library with 125I-MAb 9 identified three immunoreactive clones. vWF inserts were amplified by the PCR and their sequences demonstrated overlapping nucleotides from positions 7630 to 7855 of vWF cDNA, coding for aa residues 1698-1773 of the mature subunit, indicating that this is the epitope of MAb 9. vWF-beta-galactosidase fusion protein reacted with 125I-MAb 9 by Western blotting. In a solid-phase radioimmunoassay, the purified fusion proteins decreased the binding of vWF to 125I-MAb 9 by 50%, and this inhibition was dose-dependent between 3.5 and 120 nM. Therefore the epitope of MAb 9 is located within aa 1698-1773 of the vWF subunit, which includes the RGD sequence implicated in the binding of adhesive proteins of GPIIb/IIIa.

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Selected References

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