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Engineering of L-amino acid deaminases for the production of α-keto acids from L-amino acids

机译:用于从L-氨基酸生产α-酮酸的L-氨基酸脱氨基酶的工程设计

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摘要

α-keto acids are organic compounds that contain an acid group and a ketone group. L-amino acid deaminases are enzymes that catalyze the oxidative deamination of amino acids for the formation of their corresponding α-keto acids and ammonia. α-keto acids are synthesized industrially via chemical processes that are costly and use harsh chemicals. The use of the directed evolution technique, followed by the screening and selection of desirable variants, to evolve enzymes has proven to be an effective way to engineer enzymes with improved performance. This review presents recent studies in which the directed evolution technique was used to evolve enzymes, with an emphasis on L-amino acid deaminases for the whole-cell biocatalysts production of α-keto acids from their corresponding L-amino acids. We discuss and highlight recent cases where the engineered L-amino acid deaminases resulted in an improved production yield of phenylpyruvic acid, α-ketoisocaproate, α-ketoisovaleric acid, α-ketoglutaric acid, α-keto-γ-methylthiobutyric acid, and pyruvate.
机译:α-酮酸是含有酸基和酮基的有机化合物。 L-氨基酸脱氨基酶是催化氨基酸氧化脱氨以形成其相应的α-酮酸和氨的酶。 α-酮酸通过昂贵且使用刺激性化学物质的化学过程在工业上合成。已经证明,使用定向进化技术,接着筛选和选择所需的变体来进化酶,是工程改造具有改进性能的酶的有效方法。这篇综述提出了最近的研究,其中使用定向进化技术来进化酶,重点是从其相应的L-氨基酸全细胞生物催化剂生产α-酮酸的L-氨基酸脱氨基酶。我们讨论并重点介绍了最近的案例,其中经过改造的L-氨基酸脱氨酶可提高苯丙酮酸,α-酮异己酸,α-酮异戊酸,α-酮戊二酸,α-酮-γ-甲基硫代丁酸和丙酮酸的产量。

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