Abstract
The interactions of mouse murinoglobulin and alpha-macroglobulin with several proteinases were investigated by filtration and by assays of amidolytic activity towards synthetic substrates in the presence of proteinaceous enzyme inhibitors as well as assays of the inhibition of proteolytic activity. Mouse alpha-macroglobulin formed complexes with thrombin, clotting factor Xa, plasmin, pancreatic kallikrein, plasma kallikrein, submaxillary gland trypsin-like proteinase, neutrophil elastase, and pancreatic elastase. These complexes lost the proteolytic activities against high-molecular-weight substrates, but protected the active sites of the enzymes from inactivation by their proteinaceous inhibitors. Mouse murinoglobulin showed essentially the same properties except (i) that it did not form a complex with the clotting factor Xa, and (ii) that it did not protect plasma kallikrein, neutrophil elastase or submaxillary proteinase from inactivation by their proteinaceous inhibitors, although it formed complexes with these proteinases. No interaction was detected between Clostridium histolyticum collagenase and murinoglobulin or alpha-macroglobulin. These results indicate (i) that murinoglobulin has a proteinase-binding spectrum simila...Continue Reading
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