Thermitase (EC 3.4.21.66, thermophilic Streptomyces serine proteinase, Thermoactinomyces vulgaris serine proteinase) is an enzyme. This enzyme catalyses the following chemical reaction Thermitase (EC 3.4.21.66, thermophilic Streptomyces serine proteinase, Thermoactinomyces vulgaris serine proteinase) is an enzyme. This enzyme catalyses the following chemical reaction This peptidase is isolated from Thermoactinomyces vulgaris.