A 125/115-kDa cell surface receptor specific for vitronectin interacts with the arginine-glycine-aspartic acid adhesion sequence derived from fibronectin - PubMed (original) (raw)

A 125/115-kDa cell surface receptor specific for vitronectin interacts with the arginine-glycine-aspartic acid adhesion sequence derived from fibronectin

R Pytela et al. Proc Natl Acad Sci U S A. 1985 Sep.

Abstract

Affinity chromatography was used to identify a cell surface receptor for the adhesive protein vitronectin. Detergent extracts of human osteosarcoma (MG-63) cells were chromatographed on either vitronectin-Sepharose or Sepharose linked to the synthetic peptide Gly-Arg-Gly-Asp-Ser-Pro, which includes the fibronectin cell attachment sequence Arg-Gly-Asp. Two cell surface proteins with apparent molecular mass of 125 and 115 kDa bound to both columns and were specifically eluted with a solution containing the Gly-Arg-Gly-Asp-Ser-Pro peptide. These proteins could be incorporated into phosphatidylcholine liposomes and mediated the specific binding of these liposomes to vitronectin but not to fibronectin. In contrast, liposomes containing a previously identified 140-kDa fibronectin receptor, which interacts with the Arg-Gly-Asp sequence in fibronectin, did not bind to vitronectin. Thus, the fibronectin and vitronectin receptors each recognize the Gly-Arg-Gly-Asp-Ser-Pro peptide but exhibit mutually exclusive reactivities toward fibronectin and vitronectin. These receptors appear to belong to a family of proteins that mediate cell substratum adhesion via related but subtly different specificities.

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A 125/115-kDa cell surface receptor specific for vitronectin interacts with the arginine-glycine-aspartic acid adhesion sequence derived from fibronectin - PubMed (original) (raw)