[Thermostable leukocyte alpha-glycoprotein: immunochemical study and enzyme activity research].

Using immunochemical analysis with standard antisera, leukocyte thermostable alpha-glycoprotein (LT alpha G) was shown to be distinct from lactoferrin, lysozyme, and fibronectin. The determination of peroxidase and nonspecific elastase in immune precipitates of LT alpha G gave negative results. Affinity sorption of LT alpha G onto the pus protein component was revealed. Purified LT alpha G had amidolytic activity in response to a substrate for elastase (p-nitroanilide succinyl-trialanyl). The ability of LT alpha G to cause the hydrolysis of substrates for thrombin, kallikrein, plasmin was investigated. The identity of LT alpha G and granulocyte elastase is suggested.