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. 1974 May;139(2):359–368. doi: 10.1042/bj1390359

The interaction of α2-macroglobulin with proteinases. Binding and inhibition of mammalian collagenases and other metal proteinases

Zena Werb 1, Mary C Burleigh 1, Alan J Barrett 1, Phyllis M Starkey 1
PMCID: PMC1166291  PMID: 4374931

Abstract

1. Experiments were performed to determine whether the specific collagenases and other metal proteinases are bound and inhibited by α2-macroglobulin, as are endopeptidases of other classes. 2. A specific collagenase from rabbit synovial cells was inhibited by human serum. The inhibition could be attributed entirely to α2-macroglobulin; α1-trypsin inhibitor was not inhibitory. α2-Macroglobulin presaturated with trypsin or cathepsin B1 did not inhibit collagenase, and pretreatment of α2-macroglobulin with collagenase prevented subsequent reaction with trypsin. The binding of collagenase by α2-macroglobulin was not reversible in gel chromatography. 3. The collagenolytic activity of several rheumatoid synovial fluids was completely inhibited by incubation of the fluids with α2-macroglobulin. 4. The collagenase of human polymorphonuclear-leucocyte granules showed time-dependent inhibition by α2-macroglobulin. 5. The collagenolytic metal proteinase of Crotalus atrox venom was inhibited by α2-macroglobulin. 6. The collagenase of Clostridium histolyticum was bound by α2-macroglobulin, and inhibited more strongly with respect to collagen than with respect to a peptide substrate. 7. Thermolysin, the metal proteinase of Bacillus thermoproteolyticus, was bound and inhibited by α2-macroglobulin. 8. It was shown by polyacrylamidegel electrophoresis of reduced α2-macroglobulin in the presence of sodium dodecyl sulphate that synovial-cell collagenase, clostridial collagenase and thermolysin cleave the quarter subunit of α2-macroglobulin near its mid-point, as do serine proteinases. 9. The results are discussed in relation to previous work, and it is concluded that the characteristics of interaction of the metal proteinases with α2-macroglobulin are the same as those of other proteinases.

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Selected References

These references are in PubMed. This may not be the complete list of references from this article.

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