- A novel acylase from Streptomyces mobaraensis that efficiently catalyzes hydrolysis/synthesis of capsaicins as well as N-acyl-L-amino acids and N-acyl-peptides
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A novel enzyme that catalyzes efficient hydrolysis of capsaicin (8-methyl-N-vanillyl-6-nonenamide) was isolated from the culture broth of Streptomyces mobaraensis. The enzyme consisted of two dissimilar subunits with molecular masses of 61 and 19 KDa. The enzyme was activated and stabilized in the presence of Co2+. It showed a pH optimum of about 8 and was stable at temperatures of up to 55°C for 1 h at pH 7.8. The specific activity of the enzyme for the hydrolysis of capsaicin was 10 2-104 times higher than those for the enzymes reported to date. In an aqueous/n-hexane biphasic system, capsaicin analogues such as octanoyl, decanoyl, and lauroyl vanillylamides were synthesized from the corresponding fatty acids and vanillylamine at yields of 50% or greater. In addition, the enzyme catalyzed the deacylation of N-lauroyl-L-amino acids and N-lauroyl-L-dipeptides and the efficient synthesis of Nα-lauroyl-L-lysine, Nε-lauroyl-L-lysine, and various N-lauroyl-peptides in aqueous solution in both the absence and the presence of glycerol.
- Koreishi, Mayuko,Zhang, Demin,Imanaka, Hiroyuki,Imamura, Koreyoshi,Adachi, Shuji,Matsuno, Ryuichi,Nakanishi, Kazuhiro
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- Enzymatic synthesis of N-acyl-L-amino acids in a glycerol-water system using acylase I from pig kidney
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N-Medium-and long-chain acyl-L-amino acids were enzymatically synthesized from the corresponding L-amino acids and fatty acids using a reverse hydrolysis. Enzymes that are suitable for the synthetic reaction of N-acyl-L-amino acids were screened on the basis of hydrolytic activity toward N-lauroyl-L-glutamic acid as an indicator. Acylase I from pig kidney (EC 3.5.1.14) showed the highest N-acyl-L-amino acid hydrolytic activity among 57 commercially available enzymes tested. Acylase I effectively catalyzed the synthesis of N-lauroyl-L-amino acids except for N-lauroyl-L-proline and N-lauroyl-L-tyrosine in a glycerol-water system. Under the optimized reaction conditions, N-lauroyl-L-arginine and N-lauroyl-L-glutamic acid were obtained in conversions of 82 and 44%, respectively. The equilibrium constants calculated from the conversion obtained were 5.6, 15.4, 18.0, and 39.4 for the syntheses of N-lauroyl-L-glutamic acid, Nα-lauroyl-L-lysine, N-lauroyl-L-glutamine, and N-lauroyl-L-methionine, respectively. N-Acyl-L-arginines with myristic acid and palmitic acid as the fatty acid were also synthesized using acylase I.
- Wada, Eiko,Handa, Masato,Imamura, Koreyoshi,Sakiyama, Takaharu,Adachi, Shuji,Matsuno, Ryuichi,Nakanishi, Kazuhiro
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