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Chang J, Zhang Y, Li Z, Ma Y, Hu X, Yang J, Zhang H. Biosynthesis of α-keto acids and resolution of chiral amino acids by l-amino acid deaminases from Proteus mirabilis. Protein Expr Purif 2024; 221:106518. [PMID: 38821452 DOI: 10.1016/j.pep.2024.106518] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/24/2024] [Revised: 05/21/2024] [Accepted: 05/28/2024] [Indexed: 06/02/2024]
Abstract
Chiral amino acids and their deamination products, α-keto acids, have important applications in food, medicine, and fine chemicals. In this study, two l-amino acid deaminase genes from Proteus mirabilis, PM473 of type Ⅰ and PM471 of type Ⅱ were cloned and expressed in Escherichia coli respectively, expected to achieve the chiral separation of amino acids. Extensive substrate preference testing showed that both deaminases had catalytic effects on the d-amino acid component of the D, l-amino acids, and PM473 has a wider catalytic range for amino acids. When D, L-Cys was used as the substrate, all L-Cys components and 75.1 % of D-Cys were converted to mercapto pyruvate, and the remaining D-Cys was a single chiral enantiomer. Molecular docking analysis showed that the interaction between the substrate and the key residues affected the stereoselectivity of enzymes. The compatibility of hydrophobicity between the binding pocket and substrate may be the basic factor that affects the substrate selectivity. This work provides an alternative method for the production of α-keto acids and the resolution of chiral amino acids.
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Affiliation(s)
- Junzhang Chang
- School of Food and Bioengineering, Hefei University of Technology, Feicui Road, No.420, Hefei, Anhui, China
| | - Yuxin Zhang
- School of Food and Bioengineering, Hefei University of Technology, Feicui Road, No.420, Hefei, Anhui, China.
| | - Zhiwei Li
- School of Food and Bioengineering, Hefei University of Technology, Feicui Road, No.420, Hefei, Anhui, China.
| | - Yunfeng Ma
- Anhui Anlito Biotechnology Co., Ltd., Lvan, Anhui, China.
| | - Xueqin Hu
- School of Food and Bioengineering, Hefei University of Technology, Feicui Road, No.420, Hefei, Anhui, China.
| | - Jingwen Yang
- School of Food and Bioengineering, Hefei University of Technology, Feicui Road, No.420, Hefei, Anhui, China; Anhui Anlito Biotechnology Co., Ltd., Lvan, Anhui, China.
| | - Hongbin Zhang
- School of Food and Bioengineering, Hefei University of Technology, Feicui Road, No.420, Hefei, Anhui, China.
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Yan Y, Bai Y, Zheng X, Cai Y. Production of hydroxytyrosol through whole-cell bioconversion from L-DOPA using engineered Escherichia coli. Enzyme Microb Technol 2023; 169:110280. [PMID: 37413913 DOI: 10.1016/j.enzmictec.2023.110280] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/24/2023] [Revised: 06/01/2023] [Accepted: 06/22/2023] [Indexed: 07/08/2023]
Abstract
Hydroxytyrosol (HT), a polyphenolic molecule of high value, is used in the nutraceutical, cosmetic, food, and livestock nutrition industries. As a natural product, HT is chemically manufactured or extracted from olives; nevertheless, the increasing demand mandates the exploration and development of alternative sources, such as heterologous production by recombinant bacteria. In order to achieve this purpose, we have molecularly modified Escherichia coli to carry two plasmids. For conversion of L-DOPA (Levodopa) into HT efficiently, it is necessary to enhance the expression of DODC (DOPA decarboxylase), ADH (alcohol dehydrogenases), MAO (Monoamine oxidase) and GDH (glucose dehydrogenases). The step that significantly affects the rate of ht biosynthesis is likely to be associated with the reaction facilitated by DODC enzymatic activity, as suggested by the result of in vitro catalytic experiment and HPLC. Then Pseudomonas putida, Sus scrofa, Homo sapiens and Levilactobacillus brevis DODC were taken into comparsion. The DODC from H. sapiens is superior to that of P. putida, S. scrofa or L. brevis for HT production. Seven promoters were introduced to increase the expression levels of catalase (CAT) to remove the byproduct H2O2 and optimized coexpression strains were obtained after screening. After the 10-hour operation, the optimized whole-cell biocatalyst produced HT at a maximum titer of 4.84 g/L with over 77.5% molar substrate conversion rate.
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Affiliation(s)
- Yi Yan
- The Key Laboratory of Industrial Biotechnology, Ministry of Education, School of Biotechnology, Jiangnan University, 1800 Lihu Road, Wuxi, Jiangsu 214122, China
| | - Yajun Bai
- College of Life Sciences, Northwest University, Xi'an, Shaanxi 710069, China
| | - Xiaohui Zheng
- College of Life Sciences, Northwest University, Xi'an, Shaanxi 710069, China
| | - Yujie Cai
- The Key Laboratory of Industrial Biotechnology, Ministry of Education, School of Biotechnology, Jiangnan University, 1800 Lihu Road, Wuxi, Jiangsu 214122, China.
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3
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Luo Z, Wang Z, Wang B, Lu Y, Yan L, Zhao Z, Bai T, Zhang J, Li H, Wang W, Cheng J. An Artificial Pathway for N-Hydroxy-Pipecolic Acid Production From L-Lysine in Escherichia coli. Front Microbiol 2022; 13:842804. [PMID: 35350620 PMCID: PMC8957990 DOI: 10.3389/fmicb.2022.842804] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/24/2021] [Accepted: 01/26/2022] [Indexed: 11/30/2022] Open
Abstract
N-hydroxy-pipecolic acid (NHP) is a hydroxylated product of pipecolic acid and an important systemic acquired resistance signal molecule. However, the biosynthesis of NHP does not have a natural metabolic pathway in microorganisms. Here, we designed and constructed a promising artificial pathway in Escherichia coli for the first time to produce NHP from biomass-derived lysine. This biosynthesis route expands the lysine catabolism pathway and employs six enzymes to sequentially convert lysine into NHP. This artificial route involves six functional enzyme coexpression: lysine α-oxidase from Scomber japonicus (RaiP), glucose dehydrogenase from Bacillus subtilis (GDH), Δ1-piperideine-2-carboxylase reductase from Pseudomonas putida (DpkA), lysine permease from E. coli (LysP), flavin-dependent monooxygenase (FMO1), and catalase from E. coli (KatE). Moreover, different FMO1s are used to evaluate the performance of the produce NHP. A titer of 111.06 mg/L of NHP was yielded in shake flasks with minimal medium containing 4 g/L of lysine. By this approach, NHP has so far been produced at final titers reaching 326.42 mg/L by 48 h in a 5-L bioreactor. To the best of our knowledge, this is the first NHP process using E. coli and the first process to directly synthesize NHP by microorganisms. This study lays the foundation for the development and utilization of renewable resources to produce NHP in microorganisms.
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Affiliation(s)
- Zhou Luo
- Meat Processing Key Laboratory of Sichuan Province, College of Food and Biological Engineering, Chengdu University, Chengdu, China
| | - Zhen Wang
- College of Science and Technology, Hebei Agricultural University, Cangzhou, China
| | - Bangxu Wang
- Meat Processing Key Laboratory of Sichuan Province, College of Food and Biological Engineering, Chengdu University, Chengdu, China
| | - Yao Lu
- College of Biological and Chemical Engineering, Guangxi University of Science and Technology, Liuzhou, China
| | - Lixiu Yan
- Chongqing Academy of Metrology and Quality Inspection, Chongqing, China
| | - Zhiping Zhao
- Meat Processing Key Laboratory of Sichuan Province, College of Food and Biological Engineering, Chengdu University, Chengdu, China
| | - Ting Bai
- Meat Processing Key Laboratory of Sichuan Province, College of Food and Biological Engineering, Chengdu University, Chengdu, China
| | - Jiamin Zhang
- Meat Processing Key Laboratory of Sichuan Province, College of Food and Biological Engineering, Chengdu University, Chengdu, China
| | - Hanmei Li
- Meat Processing Key Laboratory of Sichuan Province, College of Food and Biological Engineering, Chengdu University, Chengdu, China
| | - Wei Wang
- Meat Processing Key Laboratory of Sichuan Province, College of Food and Biological Engineering, Chengdu University, Chengdu, China
| | - Jie Cheng
- Meat Processing Key Laboratory of Sichuan Province, College of Food and Biological Engineering, Chengdu University, Chengdu, China
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Luo Z, Yu S, Zeng W, Zhou J. Comparative analysis of the chemical and biochemical synthesis of keto acids. Biotechnol Adv 2021; 47:107706. [PMID: 33548455 DOI: 10.1016/j.biotechadv.2021.107706] [Citation(s) in RCA: 17] [Impact Index Per Article: 5.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/10/2020] [Revised: 01/25/2021] [Accepted: 01/26/2021] [Indexed: 12/28/2022]
Abstract
Keto acids are essential organic acids that are widely applied in pharmaceuticals, cosmetics, food, beverages, and feed additives as well as chemical synthesis. Currently, most keto acids on the market are prepared via chemical synthesis. The biochemical synthesis of keto acids has been discovered with the development of metabolic engineering and applied toward the production of specific keto acids from renewable carbohydrates using different metabolic engineering strategies in microbes. In this review, we provide a systematic summary of the types and applications of keto acids, and then summarize and compare the chemical and biochemical synthesis routes used for the production of typical keto acids, including pyruvic acid, oxaloacetic acid, α-oxobutanoic acid, acetoacetic acid, ketoglutaric acid, levulinic acid, 5-aminolevulinic acid, α-ketoisovaleric acid, α-keto-γ-methylthiobutyric acid, α-ketoisocaproic acid, 2-keto-L-gulonic acid, 2-keto-D-gluconic acid, 5-keto-D-gluconic acid, and phenylpyruvic acid. We also describe the current challenges for the industrial-scale production of keto acids and further strategies used to accelerate the green production of keto acids via biochemical routes.
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Affiliation(s)
- Zhengshan Luo
- National Engineering Laboratory for Cereal Fermentation Technology, Jiangnan University, 1800 Lihu Road, Wuxi, Jiangsu 214122, China; State Key Laboratory of Materials-Oriented Chemical Engineering, College of Food Science and Light Industry, Nanjing Tech University, Nanjing 211816, China; Key Laboratory of Industrial Biotechnology, Ministry of Education, School of Biotechnology, Jiangnan University, 1800 Lihu Road, Wuxi, Jiangsu 214122, China
| | - Shiqin Yu
- National Engineering Laboratory for Cereal Fermentation Technology, Jiangnan University, 1800 Lihu Road, Wuxi, Jiangsu 214122, China; Key Laboratory of Industrial Biotechnology, Ministry of Education, School of Biotechnology, Jiangnan University, 1800 Lihu Road, Wuxi, Jiangsu 214122, China; Jiangsu Provisional Research Center for Bioactive Product Processing Technology, Jiangnan University, 1800 Lihu Road, Wuxi, Jiangsu 214122, China
| | - Weizhu Zeng
- Key Laboratory of Industrial Biotechnology, Ministry of Education, School of Biotechnology, Jiangnan University, 1800 Lihu Road, Wuxi, Jiangsu 214122, China
| | - Jingwen Zhou
- National Engineering Laboratory for Cereal Fermentation Technology, Jiangnan University, 1800 Lihu Road, Wuxi, Jiangsu 214122, China; Key Laboratory of Industrial Biotechnology, Ministry of Education, School of Biotechnology, Jiangnan University, 1800 Lihu Road, Wuxi, Jiangsu 214122, China; Jiangsu Provisional Research Center for Bioactive Product Processing Technology, Jiangnan University, 1800 Lihu Road, Wuxi, Jiangsu 214122, China.
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5
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Sun L, Gong M, Lv X, Huang Z, Gu Y, Li J, Du G, Liu L. Current advance in biological production of short-chain organic acid. Appl Microbiol Biotechnol 2020; 104:9109-9124. [DOI: 10.1007/s00253-020-10917-0] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/18/2020] [Revised: 09/14/2020] [Accepted: 09/17/2020] [Indexed: 12/31/2022]
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6
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Liu K, Gong M, Lv X, Li J, Du G, Liu L. Biotransformation and chiral resolution of d,l-alanine into pyruvate and d-alanine with a whole-cell biocatalyst expressing l-amino acid deaminase. Biotechnol Appl Biochem 2020; 67:668-676. [PMID: 32822096 DOI: 10.1002/bab.2011] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/16/2020] [Accepted: 08/14/2020] [Indexed: 01/09/2023]
Abstract
Pyruvate is an important pharmaceutical intermediate and is widely used in food, nutraceuticals, and pharmaceuticals. However, high environmental pollution caused by chemical synthesis or complex separation process of microbial fermentation methods constrain the supply of pyruvate. Here, one-step pyruvate and d-alanine production from d,l-alanine by whole-cell biocatalysis was investigated. First, l-amino acid deaminase (Pm1) from Proteus mirabilis was expressed in Escherichia coli, resulting in pyruvate titer of 12.01 g/L. Then, N-terminal coding sequences were introduced to the 5'-end of the pm1 gene to enhance the expression of Pm1 and the pyruvate titer increased to 15.13 g/L. Next, product utilization by the biocatalyst was prevented by knocking out the pyruvate uptake transporters (cstA, btsT) and the pyruvate metabolic pathway genes pps, poxB, pflB, ldhA, and aceEF using CRISPR/Cas9, yielding 30.88 g/L pyruvate titer. Finally, by optimizing the reaction conditions, the pyruvate titer was further enhanced to 43.50 g/L in 8 H with a 79.99% l-alanine conversion rate; meanwhile, the resolution of d-alanine reached 84.0%. This work developed a whole-cell biocatalyst E. coli strain for high-yield, high-efficiency, and low-pollution pyruvate and d-alanine production, which has great potential for the commercial application in the future.
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Affiliation(s)
- Ke Liu
- Science Center for Future Foods, Jiangnan University, Wuxi, People's Republic of China
- Key Laboratory of Carbohydrate Chemistry and Biotechnology, Ministry of Education, Jiangnan University, Wuxi, People's Republic of China
| | - Mengyue Gong
- School of Food Science and Technology, Jiangnan University, Wuxi, People's Republic of China
| | - Xueqin Lv
- Science Center for Future Foods, Jiangnan University, Wuxi, People's Republic of China
- Key Laboratory of Carbohydrate Chemistry and Biotechnology, Ministry of Education, Jiangnan University, Wuxi, People's Republic of China
| | - Jianghua Li
- Science Center for Future Foods, Jiangnan University, Wuxi, People's Republic of China
- Key Laboratory of Carbohydrate Chemistry and Biotechnology, Ministry of Education, Jiangnan University, Wuxi, People's Republic of China
| | - Guocheng Du
- Science Center for Future Foods, Jiangnan University, Wuxi, People's Republic of China
- Key Laboratory of Carbohydrate Chemistry and Biotechnology, Ministry of Education, Jiangnan University, Wuxi, People's Republic of China
| | - Long Liu
- Science Center for Future Foods, Jiangnan University, Wuxi, People's Republic of China
- Key Laboratory of Carbohydrate Chemistry and Biotechnology, Ministry of Education, Jiangnan University, Wuxi, People's Republic of China
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7
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Song W, Chen X, Wu J, Xu J, Zhang W, Liu J, Chen J, Liu L. Biocatalytic derivatization of proteinogenic amino acids for fine chemicals. Biotechnol Adv 2020; 40:107496. [DOI: 10.1016/j.biotechadv.2019.107496] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/03/2019] [Revised: 11/13/2019] [Accepted: 11/18/2019] [Indexed: 01/09/2023]
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8
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Active Expression of Membrane-Bound L-Amino Acid Deaminase from Proteus mirabilis in Recombinant Escherichia coli by Fusion with Maltose-Binding Protein for Enhanced Catalytic Performance. Catalysts 2020. [DOI: 10.3390/catal10020215] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022] Open
Abstract
L-amino acid deaminases (LAADs) are membrane flavoenzymes that catalyze the deamination of neutral and aromatic L-amino acids to α-keto acids and ammonia. LAADs can be used to develop many important biotechnological applications. However, the transmembrane α-helix of LAADs restricts its soluble active expression and purification from a heterologous host, such as Escherichia coli. Herein, through fusion with the maltose-binding protein (MBP) tag, the recombinant E. coli BL21 (DE3)/pET-21b-MBP-PmLAAD was constructed and the LAAD from Proteus mirabilis (PmLAAD) was actively expressed as a soluble protein. After purification, the purified MBP-PmLAAD was obtained. Then, the catalytic activity of the MBP-PmLAAD fusion protein was determined and compared with the non-fused PmLAAD. After fusion with the MBP-tag, the catalytic efficiency of the MBP-PmLAAD cell lysate was much higher than that of the membrane-bound PmLAAD whole cells. The soluble MBP-PmLAAD cell lysate catalyzed the conversion of 100 mM L-phenylalanine (L-Phe) to phenylpyruvic acid (PPA) with a 100% yield in 6 h. Therefore, the fusion of the MBP-tag not only improved the soluble expression of the PmLAAD membrane-bound protein, but also increased its catalytic performance.
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Efficient enzymatic synthesis of α-keto acids by redesigned substrate-binding pocket of the l-amino acid deaminase (PmiLAAD). Enzyme Microb Technol 2020; 132:109393. [DOI: 10.1016/j.enzmictec.2019.109393] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/02/2019] [Revised: 08/01/2019] [Accepted: 08/04/2019] [Indexed: 11/18/2022]
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10
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Bhardwaj M, Chib S, Kaur L, Kumar A, Chaudhuri B, Malik F, Vishwakarma RA, Saran S, Mukherjee D. Conversion of amino acids to aryl/heteroaryl ethanol metabolites using human CYP2D6-expressing live baker's yeast. RSC Med Chem 2020; 11:142-147. [PMID: 33479614 PMCID: PMC7439282 DOI: 10.1039/c9md00451c] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/20/2019] [Accepted: 11/18/2019] [Indexed: 11/21/2022] Open
Abstract
Different natural aromatic/heterocyclic l-amino acids were biotransformed into aryl/heteroaryl ethanol metabolites via oxidative deamination, decarboxylation and reduction cascades using live baker's yeast cells producing intracellular human CYP2D6 enzyme. Among the three yeast strains expressing 3 different CYP2D6 variants, CYP2D6(2) (i.e. CYP2D6 wild-type) provided the best result under neutral pH conditions at RT. We have successfully converted six natural amino acids into their corresponding alcohols, having one carbon atom less, with moderate yields. Some of the downstream products like tryptophol and tyrosol induced the pTrKB (Tropomyosin receptor kinase B) activation pattern similar to that of BDNF (brain-derived neurotrophic factor), thereby depicting potential antidepressant activity. Control experiments and molecular modelling studies revealed that this tandem bio-transformation probably happens via a pyruvate intermediate. This study establishes that CYP2D6-expressing live yeast cells can be a powerful tool for the enzymatic C-N, C-C bond cleavage of amino-acids.
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Affiliation(s)
- Monika Bhardwaj
- Natural Product Chemistry Division , CSIR-IIIM , Jammu , India .
| | - Shifali Chib
- Fermentation Technology Division , CSIR-IIIM , Jammu , India .
| | - Loveleena Kaur
- Cancer Pharmacology Division , Indian Institute of Integrative Medicine (IIIM) , Jammu , India
| | - Amit Kumar
- Natural Product Chemistry Division , CSIR-IIIM , Jammu , India .
| | - Bhabatosh Chaudhuri
- Innovation Development Partners Ltd. Rothley , Leicestershire LE7 7SF , UK .
| | - Fayaz Malik
- Cancer Pharmacology Division , Indian Institute of Integrative Medicine (IIIM) , Jammu , India
| | | | - Saurabh Saran
- Fermentation Technology Division , CSIR-IIIM , Jammu , India .
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Nshimiyimana P, Liu L, Du G. Engineering of L-amino acid deaminases for the production of α-keto acids from L-amino acids. Bioengineered 2019; 10:43-51. [PMID: 30876377 PMCID: PMC6527072 DOI: 10.1080/21655979.2019.1595990] [Citation(s) in RCA: 13] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/21/2019] [Revised: 03/10/2019] [Accepted: 03/12/2019] [Indexed: 10/27/2022] Open
Abstract
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.
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Affiliation(s)
- Project Nshimiyimana
- Key Laboratory of Carbohydrate Chemistry and Biotechnology, Ministry of Education, Jiangnan University, Wuxi, China
- Key Laboratory of Industrial Biotechnology, Ministry of Education, Jiangnan University, Wuxi, China
| | - Long Liu
- Key Laboratory of Carbohydrate Chemistry and Biotechnology, Ministry of Education, Jiangnan University, Wuxi, China
- Key Laboratory of Industrial Biotechnology, Ministry of Education, Jiangnan University, Wuxi, China
| | - Guocheng Du
- Key Laboratory of Carbohydrate Chemistry and Biotechnology, Ministry of Education, Jiangnan University, Wuxi, China
- Key Laboratory of Industrial Biotechnology, Ministry of Education, Jiangnan University, Wuxi, China
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Zhang D, Jing X, Zhang W, Nie Y, Xu Y. Highly selective synthesis of d-amino acids from readily available l-amino acids by a one-pot biocatalytic stereoinversion cascade. RSC Adv 2019; 9:29927-29935. [PMID: 35531513 PMCID: PMC9072125 DOI: 10.1039/c9ra06301c] [Citation(s) in RCA: 18] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/13/2019] [Accepted: 09/16/2019] [Indexed: 11/21/2022] Open
Abstract
d-Amino acids are key intermediates required for the synthesis of important pharmaceuticals. However, establishing a universal enzymatic method for the general synthesis of d-amino acids from cheap and readily available precursors with few by-products is challenging. In this study, we constructed and optimized a cascade enzymatic route involving l-amino acid deaminase and d-amino acid dehydrogenase for the biocatalytic stereoinversions of l-amino acids into d-amino acids. Using l-phenylalanine (l-Phe) as a model substrate, this artificial biocatalytic cascade stereoinversion route first deaminates l-Phe to phenylpyruvic acid (PPA) through catalysis involving recombinant Escherichia coli cells that express l-amino acid deaminase from Proteus mirabilis (PmLAAD), followed by stereoselective reductive amination with recombinant meso-diaminopimelate dehydrogenase from Symbiobacterium thermophilum (StDAPDH) to produce d-phenylalanine (d-Phe). By incorporating a formate dehydrogenase-based NADPH-recycling system, d-Phe was obtained in quantitative yield with an enantiomeric excess greater than 99%. In addition, the cascade reaction system was also used to stereoinvert a variety of aromatic and aliphatic l-amino acids to the corresponding d-amino acids by combining the PmLAAD whole-cell biocatalyst with the StDAPDH variant. Hence, this method represents a concise and efficient route for the asymmetric synthesis of d-amino acids from the corresponding l-amino acids. An efficient one-pot biocatalytic cascade was developed for synthesis of d-amino acids from readily available l-amino acids via stereoinversion.![]()
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Affiliation(s)
- Danping Zhang
- School of Biotechnology
- Key Laboratory of Industrial Biotechnology
- Ministry of Education
- Jiangnan University
- Wuxi 214122
| | - Xiaoran Jing
- School of Biotechnology
- Key Laboratory of Industrial Biotechnology
- Ministry of Education
- Jiangnan University
- Wuxi 214122
| | - Wenli Zhang
- School of Biotechnology
- Key Laboratory of Industrial Biotechnology
- Ministry of Education
- Jiangnan University
- Wuxi 214122
| | - Yao Nie
- School of Biotechnology
- Key Laboratory of Industrial Biotechnology
- Ministry of Education
- Jiangnan University
- Wuxi 214122
| | - Yan Xu
- School of Biotechnology
- Key Laboratory of Industrial Biotechnology
- Ministry of Education
- Jiangnan University
- Wuxi 214122
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13
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Molla G, Melis R, Pollegioni L. Breaking the mirror: l-Amino acid deaminase, a novel stereoselective biocatalyst. Biotechnol Adv 2017; 35:657-668. [DOI: 10.1016/j.biotechadv.2017.07.011] [Citation(s) in RCA: 43] [Impact Index Per Article: 6.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/10/2017] [Revised: 07/04/2017] [Accepted: 07/30/2017] [Indexed: 12/27/2022]
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14
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Membrane binding of the insertion sequence of Proteus vulgaris L-amino acid deaminase stabilizes protein structure and increases catalytic activity. Sci Rep 2017; 7:13719. [PMID: 29057984 PMCID: PMC5651824 DOI: 10.1038/s41598-017-14238-7] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/17/2017] [Accepted: 10/06/2017] [Indexed: 12/13/2022] Open
Abstract
Proteus vulgaris L-amino acid deaminase (pvLAAD) belongs to a class of bacterial membrane-bound LAADs mainly express in genus Proteus, Providencia and Morganella. These LAADs employ a non-cleavable N-terminal twin-arginine translocation (Tat) peptide to transport across membrane and bind to bacterial surface. Recent studies revealed that a hydrophobic insertion sequence (INS) in these LAADs also interacts with bacterial membrane. However, the functional significance of INS-membrane interaction is not clear. In this study, we made site-directed mutagenesis on the surface-exposed hydrophobic residues of pvLAAD INS, and we found that these mutations impaired the INS-membrane interaction but did not affect pvLAAD activity in the solution. We further found that when cell membrane is present, the catalytic activity can be increased by 8~10 folds for wild-type but not INS-mutated pvLAAD, indicating that the INS-membrane interaction is necessary for increasing activity of pvLAAD. Molecular dynamic (MD) simulations suggested that INS is flexible in the solution, and its conformational dynamics could lead to substrate channel distortion. Circular dichroism (CD) spectroscopy experiments indicated that bacterial membrane was able to maintain the conformation of INS. Our study suggests the function of the membrane binding of INS is to stabilize pvLAAD structure and increase its catalytic activity.
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Liu J, Li J, Shin HD, Liu L, Du G, Chen J. Protein and metabolic engineering for the production of organic acids. BIORESOURCE TECHNOLOGY 2017; 239:412-421. [PMID: 28538198 DOI: 10.1016/j.biortech.2017.04.052] [Citation(s) in RCA: 41] [Impact Index Per Article: 5.9] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/24/2017] [Revised: 04/10/2017] [Accepted: 04/12/2017] [Indexed: 06/07/2023]
Abstract
Organic acids are natural metabolites of living organisms. They have been widely applied in the food, pharmaceutical, and bio-based materials industries. In recent years, biotechnological routes to organic acids production from renewable raw materials have been regarded as very promising approaches. In this review, we provide an overview of current developments in the production of organic acids using protein and metabolic engineering strategies. The organic acids include propionic acid, pyruvate, itaconic acid, succinic acid, fumaric acid, malic acid and citric acid. We also expect that rapid developments in the fields of systems biology and synthetic biology will accelerate protein and metabolic engineering for microbial organic acid production in the future.
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Affiliation(s)
- Jingjing Liu
- Key Laboratory of Carbohydrate Chemistry and Biotechnology, Ministry of Education, Jiangnan University, Wuxi 214122, China; Key Laboratory of Industrial Biotechnology, Ministry of Education, Jiangnan University, Wuxi 214122, China
| | - Jianghua Li
- Key Laboratory of Carbohydrate Chemistry and Biotechnology, Ministry of Education, Jiangnan University, Wuxi 214122, China; Key Laboratory of Industrial Biotechnology, Ministry of Education, Jiangnan University, Wuxi 214122, China.
| | - Hyun-Dong Shin
- School of Chemical and Biomolecular Engineering, Georgia Institute of Technology, Atlanta 30332, USA
| | - Long Liu
- Key Laboratory of Carbohydrate Chemistry and Biotechnology, Ministry of Education, Jiangnan University, Wuxi 214122, China; Key Laboratory of Industrial Biotechnology, Ministry of Education, Jiangnan University, Wuxi 214122, China
| | - Guocheng Du
- Key Laboratory of Carbohydrate Chemistry and Biotechnology, Ministry of Education, Jiangnan University, Wuxi 214122, China; Key Laboratory of Industrial Biotechnology, Ministry of Education, Jiangnan University, Wuxi 214122, China
| | - Jian Chen
- Key Laboratory of Industrial Biotechnology, Ministry of Education, Jiangnan University, Wuxi 214122, China
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