Human fibroblast collagenase. Complete primary structure and homology to an oncogene transformation-induced rat protein

Abstract

We have determined the complete sequence of the cDNA clone representing the full size human skin collagenase mRNA. Collagenase is synthesized in preproenzyme form, Mr 54,092, with a 19 amino acid long signal peptide. The primary secretion products of the enzyme consist of a minor glycosylated form, Mr 57,000, and a major unmodified polypeptide of predicted Mr 51,929. Proteolytic activation of human skin procollagenase results in removal of 81 amino acid residues from the amino-terminal portion of the proenzyme. Both potential N-glycosylation sites are contained within the proteolytically activated form of the enzyme. The primary structure of the coding region of the presented clone is homologous to an oncogene-induced rat protein whose function is still unknown, although preliminary observations suggest that it is not rat skin collagenase.