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J. Biol. Chem., Vol. 264, Issue 2, 936-939, Jan, 1989

Purification of a protein from bovine plasma that binds to type 1 plasminogen activator inhibitor and prevents its interaction with extracellular matrix. Evidence that the protein is vitronectin

J Mimuro and DJ Loskutoff
Department of Immunology, Research Institute of Scripps Clinic, La Jolla, California 92037.

Type 1 plasminogen activator inhibitor (PAI-1) binds to the extracellular matrix of cultured bovine aortic endothelial cells. Bovine plasma and bovine lung extract contain protein(s) that bind to PAI-1 and prevent this interaction. One of these proteins was purified approximately 425-fold from ammonium sulfate-fractionated plasma using standard chromatographic procedures together with affinity chromatography on PAI-1-Sepharose. The final product consisted of a major polypeptide of Mr 65,000 and two minor polypeptides of Mr 80,000 and 57,000. NH2-terminal amino acid sequence analysis of the Mr 65,000 polypeptide revealed that it was homologous with vitronectin, and antiserum against this purified binding protein recognized vitronectin and vice versa. Immunological analysis using these antisera demonstrated that the three peptides were immunologically related, and that vitronectin was present in the extracellular matrix of bovine endothelial cells and also in bovine lung.
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