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Immobilization of permeabilized cells of baker’s yeast for decomposition of H2O2 by catalase. POLISH JOURNAL OF CHEMICAL TECHNOLOGY 2019. [DOI: 10.2478/pjct-2019-0021] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/20/2022]
Abstract
Abstract
Permeabilization is one of the effective tools, used to increase the accessibility of intracellular enzymes. Immobilization is one of the best approaches to reuse the enzyme. Present investigation use both techniques to obtain a biocatalyst with high catalase activity. At the beginning the isopropyl alcohol was used to permeabilize cells of baker’s yeast in order to maximize the catalase activity within the treated cells. Afterwards the permeabilized cells were immobilized in calcium alginate beads and this biocatalyst was used for the degradation of hydrogen peroxide to oxygen and water. The optimal sodium alginate concentration and cell mass concentration for immobilization process were determined. The temperature and pH for maximum decomposition of hydrogen peroxide were assigned and are 20°C and 7 respectively. Prepared biocatalyst allowed 3.35-times faster decomposition as compared to alginate beads with non permeabilized cells. The immobilized biocatalyst lost ca. 30% activity after ten cycles of repeated use in batch operations. Each cycles duration was 10 minutes. Permeabilization and subsequent immobilization of the yeast cells allowed them to be transformed into biocatalysts with an enhanced catalase activity, which can be successfully used to decompose hydrogen peroxide.
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2
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Moon YM, Yang SY, Choi TR, Jung HR, Song HS, Han YH, Park HY, Bhatia SK, Gurav R, Park K, Kim JS, Yang YH. Enhanced production of cadaverine by the addition of hexadecyltrimethylammonium bromide to whole cell system with regeneration of pyridoxal-5'-phosphate and ATP. Enzyme Microb Technol 2019; 127:58-64. [PMID: 31088617 DOI: 10.1016/j.enzmictec.2019.04.010] [Citation(s) in RCA: 25] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/08/2019] [Revised: 03/18/2019] [Accepted: 04/12/2019] [Indexed: 10/27/2022]
Abstract
Cadaverine, also known as 1,5-pentanediamine, is an important platform chemical with a wide range of applications and can be produced either by fermentation or bioconversion. Bioconversion of cadaverine from l-lysine is the preferred method because of its many benefits, including rapid reaction time and an easy downstream process. In our previous study, we replaced pyridoxal-5-phosphate (PLP) with pyridoxal kinase (PdxY) along with pyridoxal (PL) because it could achieve 80% conversion with 0.4 M of l-lysine in 6 h. However, conversion was sharply decreased in the presence of high concentrations of l-lysine (i.e., 1 M), resulting in less than 40% conversion after several hours. In this study, we introduced an ATP regeneration system using polyphosphate kinase (ppk) into systems containing cadaverine decarboxylase (CadA) and PdxY for a sufficient supply of PLP, which resulted in enhanced cadaverine production. In addition, to improve transport efficiency, the use of surfactants was tested. We found that membrane permeabilization via hexadecyltrimethylammonium bromide (CTAB) increased the yield of cadaverine in the presence of high concentrations of l-lysine. By combining these two strategies, the ppk system and addition of CTAB, we enhanced cadaverine production up to 100% with 1 M of l-lysine over the course of 6 h.
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Affiliation(s)
- Yu-Mi Moon
- Department of Biological Engineering, College of Engineering, Konkuk University, 1 Hwayang-dong, Gwangjin-gu, Seoul 05029, Republic of Korea
| | - Soo Yeon Yang
- Department of Biological Engineering, College of Engineering, Konkuk University, 1 Hwayang-dong, Gwangjin-gu, Seoul 05029, Republic of Korea
| | - Tae Rim Choi
- Department of Biological Engineering, College of Engineering, Konkuk University, 1 Hwayang-dong, Gwangjin-gu, Seoul 05029, Republic of Korea
| | - Hye-Rim Jung
- Department of Biological Engineering, College of Engineering, Konkuk University, 1 Hwayang-dong, Gwangjin-gu, Seoul 05029, Republic of Korea
| | - Hun-Suk Song
- Department of Biological Engineering, College of Engineering, Konkuk University, 1 Hwayang-dong, Gwangjin-gu, Seoul 05029, Republic of Korea
| | - Yeong Hoon Han
- Department of Biological Engineering, College of Engineering, Konkuk University, 1 Hwayang-dong, Gwangjin-gu, Seoul 05029, Republic of Korea
| | - Hyung Yeon Park
- Department of Biological Engineering, College of Engineering, Konkuk University, 1 Hwayang-dong, Gwangjin-gu, Seoul 05029, Republic of Korea
| | - Shashi Kant Bhatia
- Department of Biological Engineering, College of Engineering, Konkuk University, 1 Hwayang-dong, Gwangjin-gu, Seoul 05029, Republic of Korea; Institute for Ubiquitous Information Technology and Applications (CBRU), Konkuk University, Seoul 05029, Republic of Korea
| | - Ranjit Gurav
- Department of Biological Engineering, College of Engineering, Konkuk University, 1 Hwayang-dong, Gwangjin-gu, Seoul 05029, Republic of Korea
| | - Kyungmoon Park
- Department of Biological and Chemical Engineering, Hongik University, Sejong Ro 2639, Jochiwon, Sejong City, Republic of Korea
| | - Jae-Seok Kim
- Department of Laboratory Medicine, Kangdong Sacred Heart Hospital, Hallym University College of Medicine, Seoul, Republic of Korea
| | - Yung-Hun Yang
- Department of Biological Engineering, College of Engineering, Konkuk University, 1 Hwayang-dong, Gwangjin-gu, Seoul 05029, Republic of Korea.
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Zheng GW, Liu YY, Chen Q, Huang L, Yu HL, Lou WY, Li CX, Bai YP, Li AT, Xu JH. Preparation of Structurally Diverse Chiral Alcohols by Engineering Ketoreductase CgKR1. ACS Catal 2017. [DOI: 10.1021/acscatal.7b01933] [Citation(s) in RCA: 56] [Impact Index Per Article: 8.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/28/2023]
Affiliation(s)
- Gao-Wei Zheng
- State
Key Laboratory of Bioreactor Engineering, Shanghai Collaborative Innovation
Center for Biomanufacturing, East China University of Science and Technology, 130 Meilong Road, Shanghai 200237, China
| | - Yuan-Yang Liu
- State
Key Laboratory of Bioreactor Engineering, Shanghai Collaborative Innovation
Center for Biomanufacturing, East China University of Science and Technology, 130 Meilong Road, Shanghai 200237, China
| | - Qi Chen
- State
Key Laboratory of Bioreactor Engineering, Shanghai Collaborative Innovation
Center for Biomanufacturing, East China University of Science and Technology, 130 Meilong Road, Shanghai 200237, China
| | - Lei Huang
- State
Key Laboratory of Bioreactor Engineering, Shanghai Collaborative Innovation
Center for Biomanufacturing, East China University of Science and Technology, 130 Meilong Road, Shanghai 200237, China
| | - Hui-Lei Yu
- State
Key Laboratory of Bioreactor Engineering, Shanghai Collaborative Innovation
Center for Biomanufacturing, East China University of Science and Technology, 130 Meilong Road, Shanghai 200237, China
| | - Wen-Yong Lou
- Lab
of Applied Biocatalysis, School of Food Science and Engineering, South China University of Technology, Guangzhou 510640, Guangdong, China
| | - Chun-Xiu Li
- State
Key Laboratory of Bioreactor Engineering, Shanghai Collaborative Innovation
Center for Biomanufacturing, East China University of Science and Technology, 130 Meilong Road, Shanghai 200237, China
| | - Yun-Peng Bai
- State
Key Laboratory of Bioreactor Engineering, Shanghai Collaborative Innovation
Center for Biomanufacturing, East China University of Science and Technology, 130 Meilong Road, Shanghai 200237, China
| | - Ai-Tao Li
- Department
of Biocatalysis, Max-Planck-Institut für Kohlenforschung, Kaiser-Wilhelm-Platz
1, Mülheim an der Ruhr 45470, Germany
| | - Jian-He Xu
- State
Key Laboratory of Bioreactor Engineering, Shanghai Collaborative Innovation
Center for Biomanufacturing, East China University of Science and Technology, 130 Meilong Road, Shanghai 200237, China
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4
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Zhang Y, Wang H, Chen L, Wu K, Xie J, Wei D. Efficient production of ethyl ( R )-4-chloro-3-hydroxybutanoate by a novel alcohol dehydrogenase from Lactobacillus curieae S1L19. ACTA ACUST UNITED AC 2016. [DOI: 10.1016/j.molcatb.2016.09.010] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/21/2022]
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5
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Dai Y, Huan B, Zhang HS, He YC. Effective Biotransformation of Ethyl 4-Chloro-3-Oxobutanoate into Ethyl (S)-4-Chloro-3-Hydroxybutanoate by Recombinant E. coli CCZU-T15 Whole Cells in [ChCl][Gly]–Water Media. Appl Biochem Biotechnol 2016; 181:1347-1359. [DOI: 10.1007/s12010-016-2288-0] [Citation(s) in RCA: 21] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/21/2016] [Accepted: 10/10/2016] [Indexed: 10/20/2022]
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6
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Tan L, Jiang T, Yang X, Li W, Pan L, Yu M. Core-shell biopolymer microspheres for sustained drug release. J Appl Polym Sci 2014. [DOI: 10.1002/app.41782] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
Affiliation(s)
- Liqing Tan
- Department of Medicinal Chemistry; School of Pharmacy, Chongqing Medical University; Chongqing 400016 People's Republic of China
- Department of Pharmacy; The Third Affiliated Hospital of Third Military Medical University; Chongqing 400042 People's Republic of China
| | - Tao Jiang
- Department of Medicinal Chemistry; School of Pharmacy, Chongqing Medical University; Chongqing 400016 People's Republic of China
- Department of Pharmacy; Xinqiao Hospital of Third Military Medical University; Chongqing 400037 People's Republic of China
| | - Xiaolan Yang
- Key Laboratory of Clinical Laboratory Diagnostics of the Education Ministry; College of Laboratory Medicine; Chongqing Medical University; Chongqing 400016 People's Republic of China
| | - Wei Li
- Department of Medicinal Chemistry; School of Pharmacy, Chongqing Medical University; Chongqing 400016 People's Republic of China
| | - Lijun Pan
- Pharmaceutical Teaching Laboratory; Chongqing Medical University; Chongqing 400016 People's Republic of China
| | - Mingan Yu
- Department of Medicinal Chemistry; School of Pharmacy, Chongqing Medical University; Chongqing 400016 People's Republic of China
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He YC, Zhang DP, Tao ZC, Zhang X, Yang ZX. Discovery of a reductase-producing strain recombinant E. coli CCZU-A13 using colorimetric screening and its whole cell-catalyzed biosynthesis of ethyl (R)-4-chloro-3-hydroxybutanoate. BIORESOURCE TECHNOLOGY 2014; 172:342-348. [PMID: 25277262 DOI: 10.1016/j.biortech.2014.09.062] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/08/2014] [Revised: 09/11/2014] [Accepted: 09/14/2014] [Indexed: 06/03/2023]
Abstract
An NADH-dependent reductase (SsCR) was discovered by genome data mining. After SsCR was overexpressed in E. coli BL21, recombinant E. coli CCZU-A13 with high reductase activity and excellent stereoselectivity for the reduction of ethyl 4-chloro-3-oxobutanoate (COBE) into ethyl (R)-4-chloro-3-hydroxybutanoate ((R)-CHBE) was screened using one high-throughput colorimetric screening strategy. After the reaction optimization, a highly stereoselective bioreduction of COBE into (R)-CHBE (>99% ee) with the resting cells of E. coli CCZU-A13 was successfully demonstrated in n-butyl acetate-water (10:90, v/v) biphasic system. Biotransformation of 600mM COBE for 8h in the biphasic system, (R)-CHBE (>99% ee) could be obtained in the high yield of 100%. Moreover, the broad substrate specificity in the reduction of aliphatic and aromatic carbonyl compounds was also found. Significantly, E. coli CCZU-A13 shows high potential in the industrial production of (R)-CHBE (>99% ee) and its derivatives.
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Affiliation(s)
- Yu-Cai He
- Jiangsu Key Laboratory of Advanced Catalytic Materials and Technology, Changzhou University, Changzhou, PR China.
| | - Dan-Ping Zhang
- Jiangsu Key Laboratory of Advanced Catalytic Materials and Technology, Changzhou University, Changzhou, PR China
| | - Zhi-Cheng Tao
- Jiangsu Key Laboratory of Advanced Catalytic Materials and Technology, Changzhou University, Changzhou, PR China
| | - Xian Zhang
- Department of Bioengineering, Rice University, Houston, TX, USA
| | - Zhen-Xing Yang
- Jiangsu Key Laboratory of Advanced Catalytic Materials and Technology, Changzhou University, Changzhou, PR China
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8
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Zhang G, Lin Y, He P, Li L, Wang Q, Ma Y. Characterization of the sugar alcohol-producing yeast Pichia anomala. ACTA ACUST UNITED AC 2014; 41:41-8. [DOI: 10.1007/s10295-013-1364-5] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/12/2013] [Accepted: 10/05/2013] [Indexed: 10/26/2022]
Abstract
Abstract
Sugar alcohols have been widely applied in the field of food and medicine for their unique properties. Compared to chemical production, microbial production of sugar alcohol has become attractive for its environmental and sustainable pattern. In this study, a potential yeast isolated from soil of Beijing suburbs was identified as Pichia anomala TIB-x229, and its key enzyme of d-arabitol dehydrogenase for microbial production of sugar alcohols was functionally characterized. This yeast could simultaneously produce d-arabitol, xylitol, and/or ribitol from a different ratio of sugar substrates at a high efficiency by bioconversion, and no glucose repression happened when mixed sugars of xylose and glucose were used as the substrates during the bioconversion. This yeast could also efficiently convert complicated feedstock such as xylose mother liquor to d-arabitol, xylitol, and ribitol with 55 % yields. To elucidate the conversion relationship of the sugar alcohols, especially d-arabitol and xylitol, the key d-arabitol dehydrogenase gene from P. anomala was cloned, expressed and purified for further in vitro characterization. The results showed that this d-arabitol dehydrogenase could catalyze arabitol to xylulose further, which is significant for xylitol production from glucose. Our study laid the foundation for improving the production of sugar alcohols by metabolic and fermentation engineering strategies.
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Affiliation(s)
- Guoqiang Zhang
- grid.9227.e 0000000119573309 Key Laboratory of Systems Microbial Biotechnology, Tianjin Institute of Industrial Biotechnology Chinese Academy of Sciences 32 XiQiDao, Tianjin Airport Economic Area 300308 Tianjin China
| | - Yuping Lin
- grid.9227.e 0000000119573309 Key Laboratory of Systems Microbial Biotechnology, Tianjin Institute of Industrial Biotechnology Chinese Academy of Sciences 32 XiQiDao, Tianjin Airport Economic Area 300308 Tianjin China
| | - Peng He
- grid.9227.e 0000000119573309 Center for Microbial Biotechnology, Institute of Microbiology Chinese Academy of Sciences 100080 Beijing China
| | - Lin Li
- grid.9227.e 0000000119573309 Key Laboratory of Systems Microbial Biotechnology, Tianjin Institute of Industrial Biotechnology Chinese Academy of Sciences 32 XiQiDao, Tianjin Airport Economic Area 300308 Tianjin China
- Key Laboratory of Industrial Biotechnology Ministry of Education, Jangnan University 214122 Wuxi China
| | - Qinhong Wang
- grid.9227.e 0000000119573309 Key Laboratory of Systems Microbial Biotechnology, Tianjin Institute of Industrial Biotechnology Chinese Academy of Sciences 32 XiQiDao, Tianjin Airport Economic Area 300308 Tianjin China
| | - Yanhe Ma
- grid.9227.e 0000000119573309 Key Laboratory of Systems Microbial Biotechnology, Tianjin Institute of Industrial Biotechnology Chinese Academy of Sciences 32 XiQiDao, Tianjin Airport Economic Area 300308 Tianjin China
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9
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Zhang ZJ, Pan J, Ma BD, Xu JH. Efficient Biocatalytic Synthesis of Chiral Chemicals. ADVANCES IN BIOCHEMICAL ENGINEERING/BIOTECHNOLOGY 2014; 155:55-106. [DOI: 10.1007/10_2014_291] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/03/2022]
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10
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Bioconversion process for synthesis of tert-butyl (3R,5S)-6-chloro-3,5-dihydroxyhexanoate using liquid-core immobilized Saccharomyces cerevisiae CGMCC No 2233. KOREAN J CHEM ENG 2013. [DOI: 10.1007/s11814-012-0093-1] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/28/2022]
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11
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Metabolic Flux and Nodes Control Analysis of Brewer’s Yeasts Under Different Fermentation Temperature During Beer Brewing. Appl Biochem Biotechnol 2012; 168:1938-52. [PMID: 23065402 DOI: 10.1007/s12010-012-9909-z] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/10/2012] [Accepted: 10/03/2012] [Indexed: 11/25/2022]
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12
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Cai P, An M, Xu L, Xu S, Hao N, Li Y, Guo K, Yan M. Development of a substrate-coupled biocatalytic process driven by an NADPH-dependent sorbose reductase from Candida albicans for the asymmetric reduction of ethyl 4-chloro-3-oxobutanoate. Biotechnol Lett 2012; 34:2223-7. [PMID: 22918792 DOI: 10.1007/s10529-012-1029-x] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/30/2012] [Accepted: 08/15/2012] [Indexed: 11/28/2022]
Abstract
A substrate-coupled biocatalytic process was developed based on the reactions catalyzed by an NADPH-dependent sorbose reductase (SOU1) from Candida albicans in which ethyl 4-chloro-3-oxobutanoate (COBE) was reduced to (S)-4-chloro-3-hydroxybutanoate [(S)-CHBE], while NADPH was regenerated by the same enzyme via oxidation of sugar alcohols. (S)-CHBE yields of 1,140, 1,150, and 780 mM were obtained from 1,220 mM COBE when sorbitol, mannitol, and xylitol were used as co-substrates, respectively. Optimization of COBE and sorbitol proportions resulted in a maximum yield of (S)-CHBE (2,340 mM) from 2,500 mM COBE, and the enantiomeric excess was 99.6 %. The substrate-coupled system driven by SOU1 maintained a stable pH and a robust intracellular NADPH circulation; thus, pH adjustment and addition of extra coenzymes were unnecessary.
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Affiliation(s)
- Ping Cai
- State Key Laboratory of Materials-Oriented Chemical Engineering, College of Biotechnology and Pharmaceutical Engineering, Nanjing University of Technology, Nanjing, People's Republic of China.
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13
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A comparative study on physiological activities of lager and ale brewing yeasts under different gravity conditions. BIOTECHNOL BIOPROC E 2012. [DOI: 10.1007/s12257-011-0658-6] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/28/2022]
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14
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Efficient Synthesis of (R)-2-Chloro-1-(3-chlorophenyl)ethanol by Permeabilized Whole Cells of Candida ontarioensis. CHINESE JOURNAL OF CATALYSIS 2012. [DOI: 10.1016/s1872-2067(11)60363-x] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/18/2023]
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15
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Kaliaperumal T, Gummadi SN, Chadha A. Synthesis of both enantiomers of ethyl-4-chloro-3-hydroxbutanoate from a prochiral ketone using Candida parapsilosis ATCC 7330. ACTA ACUST UNITED AC 2011. [DOI: 10.1016/j.tetasy.2011.08.009] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/24/2022]
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16
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Production of human phase 1 and 2 metabolites by whole-cell biotransformation with recombinant microbes. Bioanalysis 2011; 2:1277-90. [PMID: 21083240 DOI: 10.4155/bio.10.80] [Citation(s) in RCA: 35] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/21/2023] Open
Abstract
Cytochrome P450 enzymes (CYPs or P450s) are the most important enzymes involved in the phase I metabolism of drugs and poisons in humans, while UDP glycosyltransferases catalyze the majority of phase II reactions. In addition, a number of other enzymes or enzyme families contribute to the metabolism of xenobiotica, including alcohol dehydrogenase, aldehyde dehydrogenase, ester and amide hydrolases, epoxide hydrolase and flavine monooxygenases, as well as sulfotransferases, catechol-O-methyltransferase and N-acetyltransferase. A thorough understanding of their activity and of the properties of the metabolites they form is an essential prerequisite for the assessment of drug-caused side effects or toxicity. In this context of MIST, efficient production systems are needed to permit the large-scale production of human drug metabolites. As classical chemical synthesis cannot always provide these metabolites, biotechnological approaches have been developed that typically employ the recombinant expression of human drug-metabolizing enzymes. This review summarizes the current knowledge regarding whole-cell biotransformation processes that make use of such an approach.
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Richter N, Hummel W. Biochemical characterisation of a NADPH-dependent carbonyl reductase from Neurospora crassa reducing α- and β-keto esters. Enzyme Microb Technol 2011; 48:472-9. [PMID: 22113019 DOI: 10.1016/j.enzmictec.2011.02.004] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/31/2010] [Revised: 02/06/2011] [Accepted: 02/07/2011] [Indexed: 10/18/2022]
Abstract
A gene encoding an NADPH-dependent carbonyl reductase from Neurospora crassa (nccr) was cloned and heterologously expressed in Escherichia coli. The enzyme (NcCR) was purified and biochemically characterised. NcCR exhibited a restricted substrate spectrum towards various ketones, and the highest activity (468U/mg) was observed with dihydroxyacetone. However, NcCR proved to be very selective in the reduction of different α- and β-keto esters. Several compounds were converted to the corresponding hydroxy ester in high enantiomeric excess (ee) at high conversion rates. The enantioselectivity of NcCR for the reduction of ethyl 4-chloro-3-oxobutanoate showed a strong dependence on temperature. This effect was studied in detail, revealing that the ee could be substantially increased by decreasing the temperature from 40 °C (78.8%) to -3 °C (98.0%). When the experimental conditions were optimised to improve the optical purity of the product, (S)-4-chloro-3-hydroxybutanoate (ee 98.0%) was successfully produced on a 300 mg (1.8 mmol) scale using NcCR at -3 °C.
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Affiliation(s)
- Nina Richter
- evocatal GmbH, Merowingerplatz 1a, 40225 Düsseldorf, Germany
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18
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Ni Y, Li CX, Wang LJ, Zhang J, Xu JH. Highly stereoselective reduction of prochiral ketones by a bacterial reductase coupled with cofactor regeneration. Org Biomol Chem 2011; 9:5463-8. [DOI: 10.1039/c1ob05285c] [Citation(s) in RCA: 41] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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19
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Lakshmi CS, Reddy GR, Rao AB. Asymmetric Reduction of Heteroaryl Methyl Ketones Using <i>Daucus carota</i>. ACTA ACUST UNITED AC 2011. [DOI: 10.4236/gsc.2011.14019] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022]
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20
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Gong GH, Hou Y, Zhao Q, Yu MA, Liao F, Jiang L, Yang XL. A new approach for the immobilization of permeabilized brewer's yeast cells in a modified composite polyvinyl alcohol lens-shaped capsule containing montmorillonite and dimethyldioctadecylammonium bromide for use as a biocatalyst. Process Biochem 2010. [DOI: 10.1016/j.procbio.2010.05.021] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
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21
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Characterization of alcohol dehydrogenase from permeabilized brewer's yeast cells immobilized on the derived attapulgite nanofibers. Appl Biochem Biotechnol 2009; 160:2287-99. [PMID: 19578994 DOI: 10.1007/s12010-009-8692-y] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/05/2009] [Accepted: 06/05/2009] [Indexed: 10/20/2022]
Abstract
Alcohol dehydrogenase (ADH) from permeabilized brewer's yeast was immobilized on derived attapulgite nanofibers via glutaraldehyde covalent binding. The effect of immobilization on ADH activity, optimum temperature and pH, thermal, pH and operational stability, reusability of immobilized ADH, and bioreduction of ethyl 3-oxobutyrate (EOB) to ethyl(S)-3-hydroxybutyrate ((S)-EHB) by the immobilized ADH were investigated. The results show the immobilized ADH retained higher activity over wider ranges of pH and temperature than those of the free. The optimum temperature and pH were 7.5 and 35 degrees C, respectively, and 58% of the original activity was retented after incubation at 35 degrees C for 32 h. More importantly, in bioreduction of EOB mediated by immobilized ADH, the conversion of substrate and enantiomeric excess (ee) of product reached 88% and 99.2%, respectively, within 2 h and retained about 42% of the initial activity after eight cycles.
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22
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Yu MA, Hou Y, Gong GH, Zhao Q, Zhu XB, Jiang L, Yang XL, Liao F. Effects of industrial storage on the bioreduction capacity of brewer’s yeast. J Ind Microbiol Biotechnol 2008; 36:157-62. [DOI: 10.1007/s10295-008-0483-x] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/22/2008] [Accepted: 09/22/2008] [Indexed: 11/30/2022]
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23
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Abraham J, Bhat SG. Permeabilization of baker's yeast with N-lauroyl sarcosine. J Ind Microbiol Biotechnol 2008; 35:799-804. [PMID: 18415131 DOI: 10.1007/s10295-008-0350-9] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/01/2007] [Accepted: 03/28/2008] [Indexed: 01/24/2023]
Abstract
N-Lauroyl sarcosine (LS), a cationic, non-toxic and biodegradable detergent readily permeabilized whole cells of baker's yeast (Saccharomyces cerevisiae). Permeabilization was carried out to increase assayable cellular catalase activity, an enzyme of great physiological and industrial importance, and to release 5'-nucleotides which find food/nutritional applications. The event of permeabilization was concentration, time and temperature dependent. Maximum permeabilization of yeast cells were observed when 1 g wet weight (0.2 g dry wt) of cells were permeabilized with 1.0 ml of 2% LS at 45 degrees C for 15 min. LS-permeabilized cells showed 350-fold increase in catalase activity and the supernatant obtained after permeabilization was rich in 5'-nucleotides. LS-permeabilized baker's yeast cells can be used as a source of biocatalyst and to isolate valuable by-products.
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Affiliation(s)
- Jessy Abraham
- Department of Biochemistry and Nutrition, Central Food Technological Research Institute, Mysore, 570013, India.
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24
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Current awareness on yeast. Yeast 2007. [DOI: 10.1002/yea.1453] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022] Open
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