Alkaline proteinase produced by one of the monospore isolates of Streptomyces violaceorectus MC675-A8, a producer of the alkaline metalloendopeptidases named alkinonases A and AF, was purified by affinity chromatography on N-benzyloxycarbonylglycylleucylaminohexyl-Sepharose to electrophoretic homogeneity. The enzyme was inactivated by phenylmethanesulfonyl fluoride and diisopropylfluorophosphate, but not by chelating agents or sulfhydryl reagents, and was distinct from alkinonases A and AF. The optimum pH for casein hydrolysis was 9.5-10.5, and the enzyme was stable within a pH range of 5.0-12.0. The molecular weight was estimated to be 30000. The peptidase activity of the enzyme was greatest on N-benzyloxycarbonylglycylprolylleucylglycine ethyl ester among the synthetic substrates tested in this work. Amidase activity was observed towards peptide amides such as N-benzyloxycarbonylglycylleucine amide and N-benzyloxycarbonylglycylphenylalanine amide. The enzyme showed anti-inflammatory activity against carrageenan-induced edema in rats, as did alkinonases A and AF. Bradykinin was hydrolyzed by the enzyme to arginylprolylprolylglycylphenylalanylserylprolylphenylalanine and arginine. Since the enzyme showed a serine proteinase nature, the enzyme was named alkaline proteinase S, and the producing microbe was designated as Streptomyces violaceorectus MC675-A8-S.
紫色直肠链霉菌 MC675-A8 的单孢子分离株之一产生的
碱性蛋白酶,它是名为阿激酶 A 和 AF 的碱
金属内肽酶的生产者,通过 N-苄氧基羰基甘
氨酰
氨基己基-
琼脂糖凝胶上的亲和层析纯化至电泳均质。该酶可被苯甲磺酰
氟和
二异丙基氟磷酸酯灭活,但不会被
螯合剂或巯基试剂灭活,并且与羟激酶 A 和 AF 不同。
酪蛋白水解的最适pH为9.5-10.5,酶在pH 5.0-12.0范围内稳定。分子量估计为30000。在本工作测试的合成底物中,该酶对N-苄氧基羰基甘
氨酰脯
氨酰甘
氨酸
乙酯的肽酶活性最大。观察到针对肽酰胺例如N-苄氧基羰基甘
氨酰亮
氨酸酰胺和N-苄氧基羰基甘
氨酰苯丙
氨酸酰胺的酰胺酶活性。该酶对角叉菜胶引起的大鼠
水肿具有抗炎活性,羟激酶 A 和 AF 也具有同样的效果。
缓激肽被酶
水解成精
氨酰脯
氨酰甘
氨酰苯丙
氨酰丝
氨酰脯
氨酰苯丙
氨酸和精
氨酸。由于该酶显示出
丝氨酸蛋白酶性质,因此将该酶命名为
碱性蛋白酶S,并且将产生微
生物命名为Streptomyces violaceorectus MC675-A8-S。