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Characterization of a membrane-associated glycoprotein complex implicated in cell adhesion to fibronectin

✍ Scribed by Takayuki Hasegawa; Etsuko Hasegawa; Wen-Tien Chen; Kenneth M. Yamada

Publisher: John Wiley and Sons
Year: 1985
Tongue: English
Weight: 644 KB
Volume: 28
Category: Article
ISSN: 0730-2312
DOI: 10.1002/jcb.240280409

No coin nor oath required. For personal study only.

✦ Synopsis

We have characterized a 140-kDa glycoprotein complex purified by a monoclonal antibody and implicated in cell adhesion to the extracellular molecule fibronectin. Three major polypeptide components were purified by monoclonal antibody JG22E, which had apparent molecular weights of 155,000 (band l), 135,000 (band 2 ) , and 120,000 (band 3). In two-dimensional gel electrophoresis, each subunit migrated as either a broad band or a series of spots at acidic isoelectric points. After treatment with neuraminidase, the spots became focused around pH 6.2 (band l), pH 5.6 (band 2 ) , and pH 5.3 (band 3). These three major bands were compared by two-dimensional peptide mapping in a series of pairwise combinations and were found to be distinct proteins. In sucrose gradients, these proteins co-migrated as a complex sedimenting at approximately 8.4 S either before or after affinity purification, whereas separated subunits migrated at 4.7 to 5.8 S . Amino acid analysis revealed no detectable hydroxyproline and a composition characterized by a substantial number of cysteine residues compared to the average protein. Our results suggest that a noncovalent complex of structurally distinct glycoproteins is involved in adhesive interactions of fibronectin with cells.

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