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Proceedings of the National Academy of Sciences of the United States of America logoLink to Proceedings of the National Academy of Sciences of the United States of America
. 1986 Apr;83(8):2407–2411. doi: 10.1073/pnas.83.8.2407

Primary structure and cDNA cloning of human fibroblast collagenase inhibitor.

D F Carmichael, A Sommer, R C Thompson, D C Anderson, C G Smith, H G Welgus, G P Stricklin
PMCID: PMC323306  PMID: 3010309

Abstract

We report the primary structure and cDNA cloning of human fibroblast collagenase inhibitor, a glycoprotein that appears to play a central role in modulating the activity of a number of metalloendoproteases of connective tissue origin including collagenase, gelatinase, and proteoglycanase. Secreted human fibroblast collagenase inhibitor was purified and subjected to automated Edman degradation. The secreted protein consists of 184 amino acid residues; it contains two sites of N-linked oligosaccharide linkage and six disulfide bonds. Synthetic oligonucleotide probes based on selected amino acid sequences of the inhibitor were used to screen a lambda gt10 cDNA library from a human fibroblast line. Two overlapping cDNA clones were characterized to determine the complete coding and noncoding sequences of the specific mRNA. The amino acid sequence deduced from the nucleotide sequence agrees with that determined by protein sequencing. One clone appears to contain the complete 5' end and, in addition, the cDNA sequence predicts a 23-amino acid leader peptide. The other clone represents the 3' end of the mature message and includes a short poly(A)+ tract. This 3' sequence is remarkably similar to a reported cDNA encoding part of the protein derived from mouse fibroblast poly(A)+ RNA. However, this inhibitor has no substantial homology with previously sequenced protease inhibitors.

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Selected References

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