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. 1980 Aug 1;189(2):337–347. doi: 10.1042/bj1890337

Polypeptide heterogeneity of hamster and calf fibronectins.

S D Pena, G Mills, R C Hughes, J D Aplin
PMCID: PMC1162003  PMID: 7458916

Abstract

The adhesive glycoprotein fibronectin has been isolated from fresh hamster plasma by affinity chromatography on gelatin coupled to Sepharose beads by the method of Engvall & Ruoslahti [Int. J. Cancer (1979) 20, 1-5]. Polyacrylamide-gel electrophoresis of material heated in sodium dodecyl sulphate and 2-mercaptoethanol shows two prominent polypeptide subunits of approx. mol.wts. 215 000 and 200 000, with variable amounts of lower-molecular-weight fragments. The unexpected polypeptide heterogeneity of different preparations of hamster fibronectins and bovine serum fibronectin is shown to be partly an artefact and is generated during isolation and storage of purified fibronectin. Treatment of each hamster fibronectin subunit or a smaller fragment of approx. mol.wt. 140 000 with thermolysin or trypsin after radioiodination produces similar patterns of tyrpsine-containing peptides, indicating similar primary amino-acid sequences. Antibodies raised against the major subunits of hamster plasma fibronectin were coupled to Sepharose beads and used in conjunction with gelatin affinity chromatography to isolate fibronectins extracted with urea from baby-hamster kidney (BHK) cells and present in the long-term culture medium of these cells. The cell and medium fibronectins are similar to hamster plasma fibronectin in amino-acid and carbohydrate composition and also produce very similar peptide 'maps'. We conclude that the various forms of hamster fibronectins are structurally analogous in agreement with indistinguishable biological properties in mediating the substance adhesion of BKH cells [Pena & Hughes (1978) Cell Biol. Int. Rep. 3, 339-344].

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