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alpha-1-Inhibitor3 (alpha-I3), a new enzyme-binding protein, was isolated from rat plasma by a combination of ammonium sulfate precipitation, ion exchange chromatography on DEAE cellulose and gel filtration on ultrogel AcA34. Agarose gel electrophoresis of the purified inhibitor showed a single protein band with alpha1-mobility giving a single precipitation line on immunoelectrophoresis against anti-rat serum. A specific antiserum against the purified inhibitor was raised in rabbits. alpha1-I3 showed immunologic cross-reaction with human inter-alpha-trypsin inhibitor. alpha1-I3 formed a complex with trypsin, which was thereby inhibited; the electrophoretic mobility of the complex was less than that of free inhibitor. Inflammation, induced by turpentine, caused a decrease in the serum concentration of alpha1-I3 to 36% of the initial value within 48 h. alpha2 acute phase macroglobulin (alpha2-AP) showed a simultaneous increase to 7.1 g/l and alpha1-antitrypsin (alpha1-AT) to twice its normal value.

Isolation and Some Properties of a New Enzyme-Binding Protein in Rat Plasma