首页> 外文期刊>Bioprocess and Biosystems Engineering >Efficient production of (R)-(-)-2-hydroxy-4-phenyl butyric acid by recombinant Pichia pastoris expressing engineered D-lactate dehydrogenase from Lactobacillus plantarum with a single-site mutation
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Efficient production of (R)-(-)-2-hydroxy-4-phenyl butyric acid by recombinant Pichia pastoris expressing engineered D-lactate dehydrogenase from Lactobacillus plantarum with a single-site mutation

机译:表达具有单点突变的植物乳杆菌表达工程D-乳酸脱氢酶的重组毕赤酵母有效生产(R)-(-)-2-羟基-4-苯基丁酸

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摘要

( R)-2-hydroxy-4-phenylbutyric acid (R-HPBA) is a valuable intermediate for the synthesis of angiotensin-converting enzyme inhibitors. The asymmetric reduction of 2-oxo-4-phenylbutyric acid (OPBA) by oxidoreductases is an efficient approach for its synthesis. Here, we report a novel biocatalytic approach for asymmetric synthesis of R-HPBA using recombinant Pichia pastoris expressing the Tyr52Leu variant of D-lactate dehydrogenase (D-LDH) from Lactobacillus plantarum. The recombinant yeast cells showed impressive catalytic activity at a high concentration of NaOPBA (380 mM, 76 g/L) and achieved full conversion starting with 40 g/L NaOPBA or even at higher concentration. Under optimized reaction conditions (pH 7.5, 37 degrees C, and 2% glucose), a full conversion with 95% reaction yield and similar to 100% product enantiomeric excess (ee) was achieved for the preparation of R-HPBA on a 2-g scale. The findings of this study promote both the biotransformation of R-HPBA and an extension of the application of recombinant yeast as biocatalysts.
机译:(R)-2-羟基-4-苯基丁酸(R-HPBA)是用于合成血管紧张素转化酶抑制剂的有价值的中间体。氧化还原酶不对称还原2-氧代-4-苯基丁酸(OPBA)是一种有效的合成方法。在这里,我们报告了一种新型的生物催化方法,用于不对称合成R-HPBA,使用重组毕赤酵母表达植物乳杆菌的D-乳酸脱氢酶(D-LDH)的Tyr52Leu变体。重组酵母细胞在高浓度的NaOPBA(380 mM,76 g / L)下显示出令人印象深刻的催化活性,并从40 g / L的NaOPBA甚至更高浓度开始完全转化。在优化的反应条件下(pH 7.5、37摄氏度和2%的葡萄糖),在2的条件下制备R-HPBA可获得完全转化,反应产率> 95%,产物对映体过量(ee)接近100%。 -g刻度。这项研究的发现既促进了R-HPBA的生物转化,又扩展了重组酵母作为生物催化剂的应用范围。

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