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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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2
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Xiao H, Yin D, Du L, Li G, Lin J, Fang C, Shen S, Xiao G, Fang R. Effects of pork sausage on intestinal microecology and metabolism in mice. JOURNAL OF THE SCIENCE OF FOOD AND AGRICULTURE 2024; 104:3413-3427. [PMID: 38111159 DOI: 10.1002/jsfa.13227] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/05/2023] [Revised: 12/01/2023] [Accepted: 12/16/2023] [Indexed: 12/20/2023]
Abstract
BACKGROUND Processed meat, as an important part of the human diet, has been recognized as a carcinogen by the International Agency for Research on Cancer (IARC). Although numerous epidemiological reports supported the IARC's view, the relevant evidence of a direct association between processed meat and carcinogenicity has been insufficient and the mechanism has been unclear. This study aims to investigate the effects of pork sausage (as a representative example of processed meat) intake on gut microbial communities and metabolites of mice. Microbial communities and metabolites from all groups were analyzed using 16S rRNA gene sequencing and Ultra performance liquid chromatography-quadrupole-time of flight-mass spectrometer (UPLC-Q-TOF/MS), respectively. RESULTS The levels of Bacteroidetes, Bacteroides, Alloprevotella, Lactobacillus, Prevotella_9, Lachnospiraceae_NK4A136_group, Alistipes, Blautia, Proteobacteria, Firmicutes, Allobaculum, Helicobacter, Desulfovibrio, Clostridium_sensu_stricto_1, Ruminococcaceae_UCG-014, Lachnospiraceae_UCG-006 and Streptococcus (P < 0.05) were obviously altered in the mice fed a pork sausage diet. Twenty-seven metabolites from intestinal content samples and fourteen matabolites from whole blood samples were identified as potential biomarkers from multivariate analysis, including Phosphatidic acid (PA), Sphingomyelin (SM), Lysophosphatidylcholine (LysoPC), Diglyceride (DG), D-maltose, N-acylamides and so forth. The significant changes in these biomarkers demonstrate metabonomic variations in pork sausage treated rats, especially carbohydrate metabolism, lipid metabolism, and amino acid metabolism. CONCLUSION The present study provided evidence that a processed meat diet can increase the risk of colorectal cancer and other diseases significantly by altering the microbial community structure and disrupting the body's metabolic pathways. © 2023 Society of Chemical Industry.
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Affiliation(s)
- Hailong Xiao
- Key Laboratory of Agricultural Products Chemical and Biological Processing Technology, Zhejiang University of Science and Technology, Hangzhou, China
- Hangzhou Institute for Food and Drug Control, Hangzhou, China
| | - Danhan Yin
- Hangzhou Institute for Food and Drug Control, Hangzhou, China
| | - Lidan Du
- Hangzhou Institute for Food and Drug Control, Hangzhou, China
| | - Gaotian Li
- Hangzhou Institute for Food and Drug Control, Hangzhou, China
| | - Jie Lin
- Hangzhou Institute for Food and Drug Control, Hangzhou, China
| | - Chenyu Fang
- Hangzhou Institute for Food and Drug Control, Hangzhou, China
| | - Shaolin Shen
- Hangzhou Xiaoshan Institute of Measurement for Quality and Technique Supervision, Hangzhou, China
| | - Gongnian Xiao
- Key Laboratory of Agricultural Products Chemical and Biological Processing Technology, Zhejiang University of Science and Technology, Hangzhou, China
| | - Ruosi Fang
- Key Laboratory of Agricultural Products Chemical and Biological Processing Technology, Zhejiang University of Science and Technology, Hangzhou, China
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Hu KS, Chen CL, Ding HR, Wang TY, Zhu Q, Zhou YC, Chen JM, Mei JQ, Hu S, Huang J, Zhao WR, Mei LH. Production of Salvianic Acid A from l-DOPA via Biocatalytic Cascade Reactions. Molecules 2022; 27:molecules27186088. [PMID: 36144828 PMCID: PMC9501478 DOI: 10.3390/molecules27186088] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/06/2022] [Revised: 09/09/2022] [Accepted: 09/13/2022] [Indexed: 11/16/2022] Open
Abstract
Salvianic acid A (SAA), as the main bioactive component of the traditional Chinese herb Salvia miltiorrhiza, has important application value in the treatment of cardiovascular diseases. In this study, a two-step bioprocess for the preparation of SAA from l-DOPA was developed. In the first step, l-DOPA was transformed to 3,4-dihydroxyphenylalanine (DHPPA) using engineered Escherichia coli cells expressing membrane-bound L-amino acid deaminase from Proteus vulgaris. After that, the unpurified DHPPA was directly converted into SAA by permeabilized recombinant E. coli cells co-expressing d-lactate dehydrogenase from Pediococcus acidilactici and formate dehydrogenase from Mycobacterium vaccae N10. Under optimized conditions, 48.3 mM of SAA could be prepared from 50 mM of l-DOPA, with a yield of 96.6%. Therefore, the bioprocess developed here was not only environmentally friendly, but also exhibited excellent production efficiency and, thus, is promising for industrial SAA production.
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Affiliation(s)
- Ke Shun Hu
- School of Biotechnology and Chemical Engineering, NingboTech University, Ningbo 315100, China
- Department of Chemical and Biological Engineering, Zhejiang University of Science and Technology, Hangzhou 310023, China
| | - Chong Le Chen
- School of Biotechnology and Chemical Engineering, NingboTech University, Ningbo 315100, China
| | - Huan Ru Ding
- School of Biotechnology and Chemical Engineering, NingboTech University, Ningbo 315100, China
| | - Tian Yu Wang
- School of Biotechnology and Chemical Engineering, NingboTech University, Ningbo 315100, China
| | - Qin Zhu
- School of Biotechnology and Chemical Engineering, NingboTech University, Ningbo 315100, China
| | - Yi Chen Zhou
- School of Biotechnology and Chemical Engineering, NingboTech University, Ningbo 315100, China
| | - Jia Min Chen
- School of Biotechnology and Chemical Engineering, NingboTech University, Ningbo 315100, China
| | - Jia Qi Mei
- Hangzhou Huadong Medicine Group Co. Ltd., Hangzhou 310011, China
| | - Sheng Hu
- School of Biotechnology and Chemical Engineering, NingboTech University, Ningbo 315100, China
| | - Jun Huang
- Department of Chemical and Biological Engineering, Zhejiang University of Science and Technology, Hangzhou 310023, China
| | - Wei Rui Zhao
- School of Biotechnology and Chemical Engineering, NingboTech University, Ningbo 315100, China
- Correspondence: (W.R.Z.); (L.H.M.); Tel.: +86-574-881-301-30 (W.R.Z.); +86-571-879-531-61(L.H.M.)
| | - Le He Mei
- School of Biotechnology and Chemical Engineering, NingboTech University, Ningbo 315100, China
- Department of Chemical and Biological Engineering, Zhejiang University, Hangzhou 310027, China
- Jinhua Advanced Research Institute, Jinhua 321019, China
- Correspondence: (W.R.Z.); (L.H.M.); Tel.: +86-574-881-301-30 (W.R.Z.); +86-571-879-531-61(L.H.M.)
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Semi-Rational Design of Proteus mirabilis l-Amino Acid Deaminase for Expanding Its Substrate Specificity in α-Keto Acid Synthesis from l-Amino Acids. Catalysts 2022. [DOI: 10.3390/catal12020175] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022] Open
Abstract
l-amino acid deaminases (LAADs) are flavoenzymes that catalyze the stereospecific oxidative deamination of l-amino acids into α-keto acids, which are widely used in the pharmaceutical, food, chemical, and cosmetic industries. However, the substrate specificity of available LAADs is limited, and most substrates are concentrated on several bulky or basic l-amino acids. In this study, we employed a LAAD from Proteus mirabilis (PmiLAAD) and broadened its substrate specificity using a semi-rational design strategy. Molecular docking and alanine scanning identified F96, Q278, and E417 as key residues around the substrate-binding pocket of PmiLAAD. Site-directed saturation mutagenesis identified E417 as the key site for substrate specificity expansion. Expansion of the substrate channel with mutations of E417 (E417L, E417A) improved activity toward the bulky substrate l-Trp, and mutation of E417 to basic amino acids (E417K, E417H, E417R) enhanced the universal activity toward various l-amino acid substrates. The variant PmiLAADE417K showed remarkable catalytic activity improvement on seven substrates (l-Ala, l-Asp, l-Ile, l-Leu, l-Phe, l-Trp, and l-Val). The catalytic efficiency improvement obtained by E417 mutation may be attributed to the expansion of the entrance channel and its electrostatic interactions. These PmiLAAD variants with a broadened substrate spectrum can extend the application potential of LAADs.
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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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Pei S, Ruan X, Liu J, Song W, Chen X, Luo Q, Liu L, Wu J. Enhancement of α-ketoisovalerate production by relieving the product inhibition of l-amino acid deaminase from Proteus mirabilis. Chin J Chem Eng 2020. [DOI: 10.1016/j.cjche.2020.04.009] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/05/2023]
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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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9
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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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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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11
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Yuan Y, Song W, Liu J, Chen X, Luo Q, Liu L. Production of α‐Ketoisocaproate and α‐Keto‐β‐Methylvalerate by Engineered L‐Amino Acid Deaminase. ChemCatChem 2019. [DOI: 10.1002/cctc.201900259] [Citation(s) in RCA: 12] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/22/2022]
Affiliation(s)
- Yuxiang Yuan
- State Key Laboratory of Food Science and TechnologyJiangnan University Wuxi 214122 P. R. China
- Key Laboratory of Industrial Biotechnology Ministry of EducationJiangnan University Wuxi 214122 P. R. China
| | - Wei Song
- State Key Laboratory of Food Science and TechnologyJiangnan University Wuxi 214122 P. R. China
- Key Laboratory of Industrial Biotechnology Ministry of EducationJiangnan University Wuxi 214122 P. R. China
| | - Jia Liu
- State Key Laboratory of Food Science and TechnologyJiangnan University Wuxi 214122 P. R. China
- Key Laboratory of Industrial Biotechnology Ministry of EducationJiangnan University Wuxi 214122 P. R. China
| | - Xiulai Chen
- State Key Laboratory of Food Science and TechnologyJiangnan University Wuxi 214122 P. R. China
- Key Laboratory of Industrial Biotechnology Ministry of EducationJiangnan University Wuxi 214122 P. R. China
| | - Qiuling Luo
- State Key Laboratory of Food Science and TechnologyJiangnan University Wuxi 214122 P. R. China
- Key Laboratory of Industrial Biotechnology Ministry of EducationJiangnan University Wuxi 214122 P. R. China
| | - Liming Liu
- State Key Laboratory of Food Science and TechnologyJiangnan University Wuxi 214122 P. R. China
- Key Laboratory of Industrial Biotechnology Ministry of EducationJiangnan University Wuxi 214122 P. R. China
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12
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Properties of l-amino acid deaminase: En route to optimize bioconversion reactions. Biochimie 2019; 158:199-207. [DOI: 10.1016/j.biochi.2019.01.010] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/15/2018] [Accepted: 01/18/2019] [Indexed: 12/24/2022]
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13
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Zhang C, Song W, Liu J, Chen X, Liu L. Production of enantiopure (R)- or (S)-2-hydroxy-4-(methylthio)butanoic acid by multi-enzyme cascades. BIORESOUR BIOPROCESS 2019. [DOI: 10.1186/s40643-019-0244-x] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/20/2022] Open
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Zhao W, Ding H, Hu S, Huang J, Lv C, Mei J, Jin Z, Yao S, Mei L. An efficient biocatalytic synthesis of imidazole-4-acetic acid. Biotechnol Lett 2018; 40:1049-1055. [PMID: 29796898 DOI: 10.1007/s10529-018-2569-5] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/17/2018] [Accepted: 05/16/2018] [Indexed: 11/28/2022]
Abstract
OBJECTIVE To develop a new and efficient biocatalytic synthesis method of imidazole-4-acetic acid (IAA) from L-histidine (L-His). RESULTS L-His was converted to imidazole-4-pyruvic acid (IPA) by an Escherichia coli whole-cell biocatalyst expressing membrane-bound L-amino acid deaminase (mL-AAD) from Proteus vulgaris firstly. The obtained IPA was subsequently decarboxylated to IAA under the action of H2O2. Under optimum conditions, 34.97 mM IAA can be produced from 50 mM L-His, with a yield of 69.9%. CONCLUSIONS Compared to the traditional chemical synthesis, this biocatalytic method for IAA production is not only environmentally friendly, but also more cost effective, thus being promising for industrial IAA production.
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Affiliation(s)
- Weirui Zhao
- School of Biological and Chemical Engineering, Ningbo Institute of Technology, Zhejiang University, No. 1, Xue Fu Road, Yin Zhou District, Ningbo, Zhejiang, China
| | - Huanru Ding
- School of Biological and Chemical Engineering, Ningbo Institute of Technology, Zhejiang University, No. 1, Xue Fu Road, Yin Zhou District, Ningbo, Zhejiang, China.,College of Chemical and Biological Engineering, Zhejiang University, No. 38, Zhe Da Road, Xi Hu District, Hangzhou, Zhejiang, China
| | - Sheng Hu
- School of Biological and Chemical Engineering, Ningbo Institute of Technology, Zhejiang University, No. 1, Xue Fu Road, Yin Zhou District, Ningbo, Zhejiang, China
| | - Jun Huang
- Department of Chemical Engineering, The University of Utah, 201 Presidents Circle, Salt Lake City, USA
| | - Changjiang Lv
- Department of Chemical Engineering, The University of Utah, 201 Presidents Circle, Salt Lake City, USA
| | - Jiaqi Mei
- School of Biological and Chemical Engineering, Zhejiang University of Science and Technology, No. 318, Liu He Road, Xi Hu District, Hangzhou, Zhejiang, China
| | - Zhihua Jin
- School of Biological and Chemical Engineering, Ningbo Institute of Technology, Zhejiang University, No. 1, Xue Fu Road, Yin Zhou District, Ningbo, Zhejiang, China
| | - Shanjing Yao
- College of Chemical and Biological Engineering, Zhejiang University, No. 38, Zhe Da Road, Xi Hu District, Hangzhou, Zhejiang, China
| | - Lehe Mei
- School of Biological and Chemical Engineering, Ningbo Institute of Technology, Zhejiang University, No. 1, Xue Fu Road, Yin Zhou District, Ningbo, Zhejiang, China. .,College of Chemical and Biological Engineering, Zhejiang University, No. 38, Zhe Da Road, Xi Hu District, Hangzhou, Zhejiang, China.
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15
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Orrego AH, López-Gallego F, Espaillat A, Cava F, Guisan JM, Rocha-Martin J. One-step Synthesis of α-Keto Acids from Racemic Amino Acids by A Versatile Immobilized Multienzyme Cell-free System. ChemCatChem 2018. [DOI: 10.1002/cctc.201800359] [Citation(s) in RCA: 20] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/30/2022]
Affiliation(s)
- Alejandro H. Orrego
- Department of Biocatalysis; Institute of Catalysis and Petrochemistry (ICP) CSIC; Campus UAM. Cantoblanco. 28049 Madrid Spain
| | - Fernando López-Gallego
- Departamento de Química Orgánica; Instituto de Síntesis Química y Catálisis Homogénea (ISQCH); CSIC-Universidad de Zaragoza; 50009 Zaragoza Spain
- ARAID Foundation; Zaragoza Spain
| | - Akbar Espaillat
- Department of Molecular Biology and Laboratory for Molecular Infection Medicine Sweden; Umea Centre for Microbial Research; Umea University; Umea Sweden
| | - Felipe Cava
- Department of Molecular Biology and Laboratory for Molecular Infection Medicine Sweden; Umea Centre for Microbial Research; Umea University; Umea Sweden
| | - José M. Guisan
- Department of Biocatalysis; Institute of Catalysis and Petrochemistry (ICP) CSIC; Campus UAM. Cantoblanco. 28049 Madrid Spain
| | - Javier Rocha-Martin
- Department of Biocatalysis; Institute of Catalysis and Petrochemistry (ICP) CSIC; Campus UAM. Cantoblanco. 28049 Madrid Spain
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16
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Zhao W, Ding H, Lv C, Hu S, Huang J, Zheng X, Yao S, Mei L. Two-step biocatalytic reaction using recombinant Escherichia coli cells for efficient production of phenyllactic acid from l-phenylalanine. Process Biochem 2018. [DOI: 10.1016/j.procbio.2017.09.019] [Citation(s) in RCA: 18] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
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17
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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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Hou Y, Hossain GS, Li J, Shin HD, Du G, Chen J, Liu L. Metabolic engineering of cofactor flavin adenine dinucleotide (FAD) synthesis and regeneration in Escherichia coli for production of α-keto acids. Biotechnol Bioeng 2017; 114:1928-1936. [PMID: 28498544 DOI: 10.1002/bit.26336] [Citation(s) in RCA: 34] [Impact Index Per Article: 4.9] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/20/2017] [Revised: 05/01/2017] [Accepted: 05/07/2017] [Indexed: 12/28/2022]
Abstract
Cofactor flavin adenine dinucleotide (FAD) plays a vital role in many FAD-dependent enzymatic reactions; therefore, how to efficiently accelerate FAD synthesis and regeneration is an important topic in biocatalysis and metabolic engineering. In this study, a system involving the synthesis pathway and regeneration of FAD was engineered in Escherichia coli to improve α-keto acid production-from the corresponding l-amino acids-catalyzed by FAD-dependent l-amino acid deaminase (l-AAD). First, key genes, ribH, ribC, and ribF, were overexpressed and fine-tuned for FAD synthesis. In the resulting E. coli strain PHCF7, strong overexpression of pma, ribC, and ribF and moderate overexpression of ribH yielded a 90% increase in phenylpyruvic acid (PPA) titer: 19.4 ± 1.1 g · L-1 . Next, formate dehydrogenase (FDH) and NADH oxidase (NOX) were overexpressed to strengthen the regeneration rate of cofactors FADH2 /FAD using FDH for FADH2 /FAD regeneration and NOX for NAD+ /NADH regeneration. The resulting E. coli strain PHCF7-FDH-NOX yielded the highest PPA production: 31.4 ± 1.1 g · L-1 . Finally, this whole-cell system was adapted to production of other α-keto acids including α-ketoglutaric acid, α-ketoisocaproate, and keto-γ-methylthiobutyric acid to demonstrate the broad utility of strengthening of FAD synthesis and FADH2 /FAD regeneration for production of α-keto acids. Notably, the strategy reported herein may be generally applicable to other flavin-dependent biocatalysis reactions and metabolic pathway optimizations. Biotechnol. Bioeng. 2017;114: 1928-1936. © 2017 Wiley Periodicals, Inc.
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Affiliation(s)
- Ying Hou
- Key Laboratory of Carbohydrate Chemistry and Biotechnology, Ministry of Education, Jiangnan University, Wuxi, China, 214122.,Key Laboratory of Industrial Fermentation Microbiology, Ministry of Education, Tianjin University of Science and Technology, Tianjin, China
| | - Gazi S Hossain
- Key Laboratory of Carbohydrate Chemistry and Biotechnology, Ministry of Education, Jiangnan University, Wuxi, China, 214122.,Key Laboratory of Industrial Biotechnology, Ministry of Education, Jiangnan University, Wuxi, China
| | - Jianghua Li
- Key Laboratory of Carbohydrate Chemistry and Biotechnology, Ministry of Education, Jiangnan University, Wuxi, China, 214122.,Key Laboratory of Industrial Biotechnology, Ministry of Education, Jiangnan University, Wuxi, China
| | - Hyun-Dong Shin
- School of Chemical and Biomolecular Engineering, Georgia Institute of Technology, Atlanta, Georgia
| | - Guocheng Du
- Key Laboratory of Carbohydrate Chemistry and Biotechnology, Ministry of Education, Jiangnan University, Wuxi, China, 214122.,Key Laboratory of Industrial Biotechnology, Ministry of Education, Jiangnan University, Wuxi, China
| | - Jian Chen
- 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, 214122.,Key Laboratory of Industrial Biotechnology, Ministry of Education, Jiangnan University, Wuxi, China
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19
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Song Y, Li J, Shin HD, Liu L, Du G, Chen J. Biotechnological production of alpha-keto acids: Current status and perspectives. BIORESOURCE TECHNOLOGY 2016; 219:716-724. [PMID: 27575335 DOI: 10.1016/j.biortech.2016.08.015] [Citation(s) in RCA: 33] [Impact Index Per Article: 4.1] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/08/2016] [Revised: 08/04/2016] [Accepted: 08/05/2016] [Indexed: 06/06/2023]
Abstract
Alpha-keto (α-keto) acids are used widely in feeds, food additives, pharmaceuticals, and in chemical synthesis processes. Although most α-keto acids are currently produced by chemical synthesis, their biotechnological production from renewable carbohydrates is a promising new approach. In this mini-review, we first present the different types of α-keto acids as well as their applications; next, we summarize the recent progresses in the biotechnological production of some important α-keto acids; namely, pyruvate, α-ketoglutarate, α-ketoisovalerate, α-ketoisocaproate, phenylpyruvate, α-keto-γ-methylthiobutyrate, and 2,5-diketo-d-gluconate. Finally, we discuss the future prospects as well as favorable directions for the biotechnological production of keto acids that ultimately would be more environment-friendly and simpler compared with the production by chemical synthesis.
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Affiliation(s)
- Yang Song
- Key Laboratory of Industrial Biotechnology, Ministry of Education, Jiangnan University, Wuxi 214122, China; Key Laboratory of Carbohydrate Chemistry and Biotechnology, Ministry of Education, Jiangnan University, Wuxi 214122, China
| | - Jianghua Li
- Key Laboratory of Industrial Biotechnology, Ministry of Education, Jiangnan University, Wuxi 214122, China; Key Laboratory of Carbohydrate Chemistry and 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 Industrial Biotechnology, Ministry of Education, Jiangnan University, Wuxi 214122, China; Key Laboratory of Carbohydrate Chemistry and Biotechnology, Ministry of Education, Jiangnan University, Wuxi 214122, China
| | - Guocheng Du
- Key Laboratory of Industrial Biotechnology, Ministry of Education, Jiangnan University, Wuxi 214122, China; Key Laboratory of Carbohydrate Chemistry and 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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20
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Su T, Tan Y, Tsui MS, Yi H, Fu XQ, Li T, Chan CL, Guo H, Li YX, Zhu PL, Tse AKW, Cao H, Lu AP, Yu ZL. Metabolomics reveals the mechanisms for the cardiotoxicity of Pinelliae Rhizoma and the toxicity-reducing effect of processing. Sci Rep 2016; 6:34692. [PMID: 27698376 PMCID: PMC5048190 DOI: 10.1038/srep34692] [Citation(s) in RCA: 27] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/24/2016] [Accepted: 09/19/2016] [Indexed: 12/28/2022] Open
Abstract
Pinelliae Rhizoma (PR) is a commonly used Chinese medicinal herb, but it has been frequently reported about its toxicity. According to the traditional Chinese medicine theory, processing can reduce the toxicity of the herbs. Here, we aim to determine if processing reduces the toxicity of raw PR, and to explore the underlying mechanisms of raw PR-induced toxicities and the toxicity-reducing effect of processing. Biochemical and histopathological approaches were used to evaluate the toxicities of raw and processed PR. Rat serum metabolites were analyzed by LC-TOF-MS. Ingenuity pathway analysis of the metabolomics data highlighted the biological pathways and network functions involved in raw PR-induced toxicities and the toxicity-reducing effect of processing, which were verified by molecular approaches. Results showed that raw PR caused cardiotoxicity, and processing reduced the toxicity. Inhibition of mTOR signaling and activation of the TGF-β pathway contributed to raw PR-induced cardiotoxicity, and free radical scavenging might be responsible for the toxicity-reducing effect of processing. Our data shed new light on the mechanisms of raw PR-induced cardiotoxicity and the toxicity-reducing effect of processing. This study provides scientific justifications for the traditional processing theory of PR, and should help in optimizing the processing protocol and clinical combinational application of PR.
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Affiliation(s)
- Tao Su
- Consun Chinese Medicines Research Centre for Renal Diseases, School of Chinese Medicine, Hong Kong Baptist University, Kowloon Tong, Hong Kong, China
| | - Yong Tan
- Institute of Basic Research in Clinical Medicine, China Academy of Chinese Medical Science, Beijing, China
| | - Man-Shan Tsui
- Department of Pathology, Caritas Medical Center, Hong Kong, China
| | - Hua Yi
- Department of Pathology, Guangzhou University of Chinese Medicine, China
| | - Xiu-Qiong Fu
- Consun Chinese Medicines Research Centre for Renal Diseases, School of Chinese Medicine, Hong Kong Baptist University, Kowloon Tong, Hong Kong, China
| | - Ting Li
- Consun Chinese Medicines Research Centre for Renal Diseases, School of Chinese Medicine, Hong Kong Baptist University, Kowloon Tong, Hong Kong, China
| | - Chi Leung Chan
- Consun Chinese Medicines Research Centre for Renal Diseases, School of Chinese Medicine, Hong Kong Baptist University, Kowloon Tong, Hong Kong, China
| | - Hui Guo
- Consun Chinese Medicines Research Centre for Renal Diseases, School of Chinese Medicine, Hong Kong Baptist University, Kowloon Tong, Hong Kong, China
| | - Ya-Xi Li
- Consun Chinese Medicines Research Centre for Renal Diseases, School of Chinese Medicine, Hong Kong Baptist University, Kowloon Tong, Hong Kong, China
| | - Pei-Li Zhu
- Consun Chinese Medicines Research Centre for Renal Diseases, School of Chinese Medicine, Hong Kong Baptist University, Kowloon Tong, Hong Kong, China
| | - Anfernee Kai Wing Tse
- Consun Chinese Medicines Research Centre for Renal Diseases, School of Chinese Medicine, Hong Kong Baptist University, Kowloon Tong, Hong Kong, China
- Institute of Integrated Bioinfomedicine & Translational Science, HKBU Shenzhen Research Institute and Continuing Education, Shenzhen, China
| | - Hui Cao
- College of Pharmacy, Jinan University, Guangzhou, China
| | - Ai-Ping Lu
- Consun Chinese Medicines Research Centre for Renal Diseases, School of Chinese Medicine, Hong Kong Baptist University, Kowloon Tong, Hong Kong, China
- Institute of Integrated Bioinfomedicine & Translational Science, HKBU Shenzhen Research Institute and Continuing Education, Shenzhen, China
| | - Zhi-Ling Yu
- Consun Chinese Medicines Research Centre for Renal Diseases, School of Chinese Medicine, Hong Kong Baptist University, Kowloon Tong, Hong Kong, China
- Institute of Integrated Bioinfomedicine & Translational Science, HKBU Shenzhen Research Institute and Continuing Education, Shenzhen, China
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21
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Ju Y, Tong S, Gao Y, Zhao W, Liu Q, Gu Q, Xu J, Niu L, Teng M, Zhou H. Crystal structure of a membrane-bound l -amino acid deaminase from Proteus vulgaris. J Struct Biol 2016; 195:306-315. [DOI: 10.1016/j.jsb.2016.07.008] [Citation(s) in RCA: 22] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/23/2016] [Revised: 06/20/2016] [Accepted: 07/12/2016] [Indexed: 10/21/2022]
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22
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Gao H, Khera E, Lee JK, Wen F. Immobilization of Multi-biocatalysts in Alginate Beads for Cofactor Regeneration and Improved Reusability. J Vis Exp 2016. [PMID: 27166648 DOI: 10.3791/53944] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/31/2022] Open
Abstract
We have recently developed a simple, reusable and coupled whole-cell biocatalytic system with the capability of cofactor regeneration and biocatalyst immobilization for improved production yield and sustained synthesis. Described herewith is the experimental procedure for the development of such a system consisting of two E. coli strains that express functionally complementary enzymes. Together, these two enzymes can function co-operatively to mediate the regeneration of expensive cofactors for improving the product yield of the bioreaction. In addition, the method of synthesizing an immobilized form of the coupled biocatalytic system by encapsulation of whole cells in calcium alginate beads is reported. As an example, we present the improved biosynthesis of L-xylulose from L-arabinitol by coupling E. coli cells expressing the enzymes L-arabinitol dehydrogenase or NADH oxidase. Under optimal conditions and using an initial concentration of 150 mM L-arabinitol, the maximal L-xylulose yield reached 96%, which is higher than those reported in the literature. The immobilized form of the coupled whole-cell biocatalysts demonstrated good operational stability, maintaining 65% of the yield obtained in the first cycle after 7 cycles of successive re-use, while the free cell system almost completely lost the catalytic activity. Therefore, the methods reported here provides two strategies that could help improve the industrial production of L-xylulose, as well as other value-added compounds requiring the use of cofactors in general.
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Affiliation(s)
- Hui Gao
- Department of Chemical Engineering, Konkuk University
| | - Eshita Khera
- Department of Chemical Engineering, University of Michigan
| | - Jung-Kul Lee
- Department of Chemical Engineering, Konkuk University;
| | - Fei Wen
- Department of Chemical Engineering, University of Michigan;
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23
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Impact of 4-epi-oxytetracycline on the gut microbiota and blood metabolomics of Wistar rats. Sci Rep 2016; 6:23141. [PMID: 26976662 PMCID: PMC4791543 DOI: 10.1038/srep23141] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/06/2015] [Accepted: 02/29/2016] [Indexed: 01/09/2023] Open
Abstract
The impact of 4-epi-oxytetracycline (4-EOTC), one of the main oxytetracycline (OTC) metabolites, on the gut microbiota and physiological metabolism of Wistar rats was analyzed to explore the dynamic alterations apparent after repeated oral exposure (0.5, 5.0 or 50.0 mg/kg bw) for 15 days as shown by 16S rRNA pyrosequencing and UPLC-Q-TOF/MS analysis. Both principal component analysis and cluster analysis showed consistently altered patterns with distinct differences in the treated groups versus the control groups. 4-EOTC treatment at 5.0 or 50.0 mg/kg increased the relative abundance of the Actinobacteria, specifically Bifidobacteriaceae, and improved the synthesis of lysophosphatidylcholine (LysoPC), as shown by the lipid biomarkers LysoPC(16:0), LysoPC(18:3), LysoPC(20:3), and LysoPC(20:4). The metabolomic analysis of urine samples also identified four other decreased metabolites: diacylglycerol, sphingomyelin, triacylglycerol, and phosphatidylglycerol. Notably, the significant changes observed in these biomarkers demonstrated the ongoing disorder induced by 4-EOTC. Blood and urine analysis revealed that residual 4-EOTC accumulated in the rats, even two weeks after oral 4-EOTC administration, ceased. Thus, through thorough analysis, it can be concluded that the alteration of the gut microbiota and disorders in blood metabolomics are correlated with 4-EOTC treatment.
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24
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Hossain GS, Shin HD, Li J, Wang M, Du G, Liu L, Chen J. Integrating error-prone PCR and DNA shuffling as an effective molecular evolution strategy for the production of α-ketoglutaric acid byl-amino acid deaminase. RSC Adv 2016. [DOI: 10.1039/c6ra02940j] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
Abstract
l-Amino acid deaminases (LAADs; EC 1.4.3.2) belong to a family of amino acid dehydrogenases that catalyze the formation of α-keto acids froml-amino acids.
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Affiliation(s)
- Gazi Sakir Hossain
- School of Food Science and Technology
- Jiangnan University
- Wuxi 214122
- China
- Key Laboratory of Carbohydrate Chemistry and Biotechnology
| | - Hyun-dong Shin
- School of Chemical and Biomolecular Engineering
- Georgia Institute of Technology
- Atlanta
- USA
| | - Jianghua Li
- Key Laboratory of Carbohydrate Chemistry and Biotechnology
- Ministry of Education
- Jiangnan University
- Wuxi 214122
- China
| | - Miao Wang
- School of Food Science and Technology
- Jiangnan University
- Wuxi 214122
- China
| | - Guocheng Du
- Key Laboratory of Carbohydrate Chemistry and Biotechnology
- Ministry of Education
- Jiangnan University
- Wuxi 214122
- China
| | - Long Liu
- Key Laboratory of Carbohydrate Chemistry and Biotechnology
- Ministry of Education
- Jiangnan University
- Wuxi 214122
- China
| | - Jian Chen
- Key Laboratory of Carbohydrate Chemistry and Biotechnology
- Ministry of Education
- Jiangnan University
- Wuxi 214122
- China
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25
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Song Y, Li J, Shin HD, Du G, Liu L, Chen J. One-step biosynthesis of α-ketoisocaproate from L-leucine by an Escherichia coli whole-cell biocatalyst expressing an L-amino acid deaminase from Proteus vulgaris. Sci Rep 2015; 5:12614. [PMID: 26217895 PMCID: PMC4517468 DOI: 10.1038/srep12614] [Citation(s) in RCA: 27] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/02/2015] [Accepted: 07/03/2015] [Indexed: 11/12/2022] Open
Abstract
This work aimed to develop a whole-cell biotransformation process for the production of α-ketoisocaproate from L-leucine. A recombinant Escherichia coli strain was constructed by expressing an L-amino acid deaminase from Proteus vulgaris. To enhance α-ketoisocaproate production, the reaction conditions were optimized as follows: whole-cell biocatalyst 0.8 g/L, leucine concentration 13.1 g/L, temperature 35 °C, pH 7.5, and reaction time 20 h. Under the above conditions, the α-ketoisocaproate titer reached 12.7 g/L with a leucine conversion rate of 97.8%. In addition, different leucine feeding strategies were examined to increase the α-ketoisocaproate titer. When 13.1 g/L leucine was added at 2-h intervals (from 0 to 22 h, 12 addition times), the α-ketoisocaproate titer reached 69.1 g/L, while the leucine conversion rate decreased to 50.3%. We have developed an effective process for the biotechnological production of α-ketoisocaproate that is more environmentally friendly than the traditional petrochemical synthesis approach.
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Affiliation(s)
- Yang Song
- 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
- Synergetic Innovation Center Of Food Safety and Nutrition, 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
- Synergetic Innovation Center Of Food Safety and Nutrition, Wuxi 214122, China
| | - Hyun-dong Shin
- School of Chemical and Biomolecular Engineeirng, Georgia Institute of Technology, Atlanta 30332, USA
| | - 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
- Synergetic Innovation Center Of Food Safety and Nutrition, Wuxi 214122, China
| | - 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
- Synergetic Innovation Center Of Food Safety and Nutrition, Wuxi 214122, China
| | - Jian Chen
- Key Laboratory of Industrial Biotechnology, Ministry of Education, Jiangnan University, Wuxi 214122, China
- Synergetic Innovation Center Of Food Safety and Nutrition, Wuxi 214122, China
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