Studies on Acylase Activity and Microorganisms. XIX Optical Resolution of Threonine, Lysine, Tryptophan, and Methionine by Acylase of Soil Bacteria
作者:Yukio Kameda、Katsuhiko Matsui、Yukio Kimura、Etsuko Toyoura、Masako Kimura
DOI:10.1248/cpb.10.1146
日期:——
Fifteen strains (KT 202, KT 205, KT 207, etc.) of soil bacteria capable of asymmetric hydrolysis of N-benzoyl-DL-threonine, 2, 6-di-N-benzoyl-DL-lysine, N-acetyl-DLlysine, N-acetyl-DL-tryptophan or N-acetyl-DL-methionine were isolated by using a synthetic medium containing N-acyl-derivatives of amino acids as the sole source of carbon (Table I). N-Benzoyl-DL-threonine was asymmetrically hydrolyzed to L-threonine, N-benzoyl-D-threonine and benzoic acid by the acylase of KT 218, KT 229, and KT 83, while 2, 6-di-N-benzoyl-DL-lysine, to 6-N-benzoyl-L-lysine, 2, 6-di-N-benzoyl-D-lysine and benzoic acid by KT 218 and KT 229. KT 241 and KT 224 hydrolyzed asymmetrically N- acetyl- DL-tryptophan and N-acetyl-DL-methionine to L-tryptophan and N-acetyl-D-tryptophan, and L-methionine and N-acetyl-D-methionine, respectively. It was observed that N-acetyl-D-tryptophan and N-acetyl-D-methionine were hydrolyzed by several strains (KT 229, KT 83, KT 222, etc.) of soil bacteria. It seems of interest to note that N-acetyl-L-methionine was more easily hydrolyzed by KT 224 or KT 218 than N-acetyl-L-tryptophan, while the latter was more easily hydrolyzed by KT 241, and that the N-acetyl derivative of L-methionine was more easily hydrolyzed by KT 224 or KT 241 than the N-benzoyl derivative, while the latter was more easily hydrolyzed by KT 218.
通过使用含有氨基酸N-酰基衍生物作为唯一碳源的合成培养基,分离出15株能够不对称水解N-苯甲酰-DL-苏氨酸、2,6-二N-苯甲酰-DL-赖氨酸、N-乙酰-DL-赖氨酸、N-乙酰-DL-色氨酸或N-乙酰-DL-蛋氨酸的土壤细菌(见表I)。N-苯甲酰-DL-苏氨酸在KT 218、KT 229和KT 83的酰化酶作用下不对称水解为L-苏氨酸、N-苯甲酰-D-苏氨酸和苯甲酸,而2,6-二N-苯甲酰-DL-赖氨酸则在KT 218和KT 229的作用下水解为6-N-苯甲酰-L-赖氨酸、2,6-二N-苯甲酰-D-赖氨酸和苯甲酸。KT 241和KT 224则分别将N-乙酰-DL-色氨酸和N-乙酰-DL-蛋氨酸不对称水解为L-色氨酸和N-乙酰-D-色氨酸以及L-蛋氨酸和N-乙酰-D-蛋氨酸。观察到N-乙酰-D-色氨酸和N-乙酰-D-蛋氨酸被若干株土壤细菌(如KT 229、KT 83、KT 222等)水解。值得注意的是,N-乙酰-L-蛋氨酸比N-乙酰-L-色氨酸更容易被KT 224或KT 218水解,而后者则更容易被KT 241水解。此外,L-蛋氨酸的N-乙酰衍生物比N-苯甲酰衍生物更容易被KT 224或KT 241水解,而后者则更容易被KT 218水解。