Abstract
Fibronectin ('cold-insoluble globulin') has been suggested as a possible mediator of platelet adhesion. A fibronectin-binding protein as partially purified from washed solubilized human platelet membranes by affinity chromatography on fibronectin-Sepharose. The isolated protein migrated as a single band on sodium dodecyl sulphate/polyacrylamide-gel electrophoresis with an Mr (relative molecular mass) of approx. 125 000 under reducing conditions. The protein migrated as a dimer in non-reduced gels. The purified protein did not react with immunoglobulins against fibrinogen or fibronectin when tested in crossed immunoelectrophoresis or electroimmunoassay. The protein and purified fibronectin formed a complex that had a significantly faster mobility in crossed immunoelectrophoresis than did native fibronectin. The presence of heparin in the binding-protein-fibronectin mixture resulted in an even faster mobility of the complex, whereas the mobility of native fibronectin was unaffected. Crossed affinoimmunoelectrophoresis of the complex using different lectins suggested that the binding protein is a glycoprotein containing N-acetylglucosamine residues. The complex, but not purified fibronectin, bound to phenyl-Sepharose on crossed hydrophobic-interaction immunoelectrophoresis. The results strongly suggest the presence of a fibronectin-binding glycoprotein in the platelet membrane.
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