腈水解酶催化的3-取代的戊二腈脱对称为旋光的3-取代的4-氰基丁酸提供了一种吸引人的方法,可用于制备手性β-取代的γ-氨基酸,这是药物中的重要组成部分。在这项研究中,我们采用了酶-底物对接和丙氨酸扫描来确定关键氨基酸残基,这些残基对Synychocystis sp。的腈水解酶的活性和立体选择性具有积极的影响。PCC6803(不锈钢NIT)。然后,进行正氨基酸残基(H141,P194,M197,I201和F202)的位点饱和诱变和组合诱变,并用经鉴定,高活性和立体选择性可用于3-取代的戊二腈的脱对称化反应,以提供高达488 g L -1 d -1的高时空生产率的(S)-3-取代-4-氰基丁酸。分子计算表明,酶活性的提高可能是由于底物结合腔的扩大。有趣的是,同时提高了立体选择性。
Improving the catalytic efficiency and stereoselectivity of a nitrilase from <i>Synechocystis</i> sp. PCC6803 by semi-rational engineering en route to chiral γ-amino acids
3-substituted 4-cyanobutanoic acid offers an attractive approach to access chiral β-substituted γ-amino acids, an important moiety in pharmaceuticals. In this study, we employed enzyme-substrate docking and alanine scanning to determine the key amino acid residues which have a positive effect on the activity and stereoselectivity of a nitrilase from Synechocystis sp. PCC6803 (SsNIT). Then, site-saturation mutagenesis
腈水解酶催化的3-取代的戊二腈脱对称为旋光的3-取代的4-氰基丁酸提供了一种吸引人的方法,可用于制备手性β-取代的γ-氨基酸,这是药物中的重要组成部分。在这项研究中,我们采用了酶-底物对接和丙氨酸扫描来确定关键氨基酸残基,这些残基对Synychocystis sp。的腈水解酶的活性和立体选择性具有积极的影响。PCC6803(不锈钢NIT)。然后,进行正氨基酸残基(H141,P194,M197,I201和F202)的位点饱和诱变和组合诱变,并用经鉴定,高活性和立体选择性可用于3-取代的戊二腈的脱对称化反应,以提供高达488 g L -1 d -1的高时空生产率的(S)-3-取代-4-氰基丁酸。分子计算表明,酶活性的提高可能是由于底物结合腔的扩大。有趣的是,同时提高了立体选择性。
Microbial desymmetrization of 3-arylglutaronitriles, an unusual enhancement of enantioselectivity in the presence of additives
3-arylglutaronitriles catalyzed by Rhodococcus sp. AJ270 cells proceeded regiospecifically and enantioselectively to produce S-(+)-3-aryl-4-cyanobutyric acids in high enantiomeric excess. Convenient chemoenzymatic syntheses of optically active R-(−)-4-amino-3-phenylbutyric acid and 4R-(−)-4-phenyltetrahydropyran-2-one are described.
在有机添加剂(例如丙酮或β-环糊精)的存在下,或在己烷和磷酸盐缓冲液的双相系统中,红球菌(Rhodococcus sp。)催化3-芳基戊二腈的微生物脱对称化。AJ270细胞在区域特异性和对映体选择性上产生高对映体过量的S -(+)-3-芳基-4-氰基丁酸。描述了光学活性R -(-)-4-氨基-3-苯基丁酸和4 R -(-)-4-苯基四氢吡喃-2-酮的便捷化学酶促合成。
Enzymatic desymmetrization of 3-alkyl- and 3-arylglutaronitriles, a simple and convenient approach to optically active 4-amino-3-phenylbutanoic acids
作者:Mei-Xiang Wang、Chu-Sheng Liu、Ji-Sheng Li
DOI:10.1016/s0957-4166(02)00028-9
日期:2002.1
The enantioselective hydrolysis of 3-alkyl- and 3-arylglutaronitriles catalyzed by Rhodococcus sp. AJ270 cells, afforded the corresponding (S)-3-substituted 4-cyanobutanoic acids with low to moderate enantiomeric purities. Additives such as acetone were found to significantly enhance the enantioselectivity of the desymmetrization, giving enantiomeric excesses of up to 95%. The synthetic potential of the homochiral product was also demonstrated by the preparation of optically active (R)- and (S)-4-amino-3-phenylbutanoic acids. (C) 2002 Elsevier Science Ltd. All rights reserved.
Biocatalytic desymmetrization of 3-substituted glutaronitriles by nitrilases. A convenient chemoenzymatic access to optically active (S)-Pregabalin and (R)-Baclofen
prochiral 3-substituted glutaronitriles offers a new approach to access (S)-Pregabalin and (R)-Baclofen. A number of nitrilases from diverse sources were screened with 3-isobutylglutaronitriles (1a) or 3-(4′-chlorophenyl)glutaronitriles (1b) as the substrate. Some nitrilases were found to catalyze the desymmetric hydrolysis of 1a and 1b to form opticallyactive 3-(cyanomethyl)-5-methylhexanoic acid (2a)
Inverting the Enantiopreference of Nitrilase‐Catalyzed Desymmetric Hydrolysis of Prochiral Dinitriles by Reshaping the Binding Pocket with a Mirror‐Image Strategy
obtained. The mutant enzyme was applied in the preparation of optically pure (R)‐3‐isobutyl‐4‐cyanobutanoic acid ((R)‐2 a) and showed similar stereopreferenceinversion towards a series of 3‐substituted glutaronitriles. This study may offer a general strategy to switch the stereopreference of other nitrilases and other enzymes toward the desymmetric reactions of prochiral substrates with two identical