Streptogrisin A (EC 3.4.21.80, Streptomyces griseus protease A, protease A, proteinase A, Streptomyces griseus proteinase A, Streptomyces griseus serine proteinase 3, Streptomyces griseus serine proteinase A) is an enzyme. This enzyme catalyses the following chemical reaction Streptogrisin A (EC 3.4.21.80, Streptomyces griseus protease A, protease A, proteinase A, Streptomyces griseus proteinase A, Streptomyces griseus serine proteinase 3, Streptomyces griseus serine proteinase A) is an enzyme. This enzyme catalyses the following chemical reaction This enzyme is isolated from Streptomyces griseus.