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Xiao Z, Guo S, Lu W. Asymmetric reduction of 4-trimethylsilyl-3-butyn-2-one to (R)-4-trimethylsilyl-3-butyn-2-ol catalyzed by a novel strain lyophilized Acetobacter sp. CCTCC M209061 in an aqueous/ionic liquid biphasic system. REACTION KINETICS MECHANISMS AND CATALYSIS 2022. [DOI: 10.1007/s11144-022-02223-9] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/01/2022]
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Wei P, Cui YH, Zong MH, Xu P, Zhou J, Lou WY. Enzymatic characterization of a recombinant carbonyl reductase from Acetobacter sp. CCTCC M209061. BIORESOUR BIOPROCESS 2017; 4:39. [PMID: 28913159 PMCID: PMC5573764 DOI: 10.1186/s40643-017-0169-1] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/30/2017] [Accepted: 08/17/2017] [Indexed: 12/20/2022] Open
Abstract
Background Acetobacter sp. CCTCC M209061 could catalyze carbonyl compounds to chiral alcohols following anti-Prelog rule with excellent enantioselectivity. Therefore, the enzymatic characterization of carbonyl reductase (CR) from Acetobacter sp. CCTCC M209061 needs to be investigated. Results A CR from Acetobacter sp. CCTCC M209061 (AcCR) was cloned and expressed in E. coli. AcCR was purified and characterized, finding that AcCR as a dual coenzyme-dependent short-chain dehydrogenase/reductase (SDR) was more preferred to NADH for biocatalytic reactions. The AcCR was activated and stable when the temperature was under 35 °C and the pH range was from 6.0 to 8.0 for the reduction of 4′-chloroacetophenone with NADH as coenzyme, and the optimal temperature and pH were 45 °C and 8.5, respectively, for the oxidation reaction of isopropanol with NAD+. The enzyme showed moderate thermostability with half-lives of 25.75 h at 35 °C and 13.93 h at 45 °C, respectively. Moreover, the AcCR has broad substrate specificity to a range of ketones and ketoesters, and could catalyze to produce chiral alcohol with e.e. >99% for the majority of tested substrates following the anti-Prelog rule. Conclusions The recombinant AcCR exhibited excellent enantioselectivity, broad substrate spectrum, and highly stereoselective anti-Prelog reduction of prochiral ketones. These results suggest that AcCR is a powerful catalyst for the production of anti-Prelog alcohols.The biocatalytic reactions conducted with the recombinant AcCR ![]()
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Affiliation(s)
- Ping Wei
- Lab of Applied Biocatalysis, School of Food Science and Engineering, South China University of Technology, Guangzhou, 510640 Guangdong China.,School of Chemistry and Chemical Engineering, South China University of Technology, Guangzhou, 510640 Guangdong China
| | - Yu-Han Cui
- Lab of Applied Biocatalysis, School of Food Science and Engineering, South China University of Technology, Guangzhou, 510640 Guangdong China
| | - Min-Hua Zong
- Lab of Applied Biocatalysis, School of Food Science and Engineering, South China University of Technology, Guangzhou, 510640 Guangdong China.,School of Chemistry and Chemical Engineering, South China University of Technology, Guangzhou, 510640 Guangdong China
| | - Pei Xu
- Lab of Applied Biocatalysis, School of Food Science and Engineering, South China University of Technology, Guangzhou, 510640 Guangdong China
| | - Jian Zhou
- School of Chemistry and Chemical Engineering, South China University of Technology, Guangzhou, 510640 Guangdong China
| | - Wen-Yong Lou
- Lab of Applied Biocatalysis, School of Food Science and Engineering, South China University of Technology, Guangzhou, 510640 Guangdong China
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Candida parapsilosis: A versatile biocatalyst for organic oxidation-reduction reactions. Bioorg Chem 2016; 68:187-213. [DOI: 10.1016/j.bioorg.2016.08.007] [Citation(s) in RCA: 17] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/01/2016] [Revised: 08/08/2016] [Accepted: 08/10/2016] [Indexed: 11/22/2022]
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The evaluation of kefir pure culture starter: Liquid-core capsule entrapping microorganisms isolated from kefir grains. FOOD SCI TECHNOL INT 2016; 22:598-608. [DOI: 10.1177/1082013216628311] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/12/2015] [Accepted: 12/22/2015] [Indexed: 11/15/2022]
Abstract
The main purpose of this study was to develop a pure culture starter for producing kefir. In order to accomplish starter recycling, yeasts ( Kluyveromyces marxianus strain, Pichia kudriavzevii clone), lactic acid bacteria ( Lactobacillus kefiri strain F4Aa, Lactobacillus kefiri strain NM131-7, Lactobacillus kefiri strain NM132-3, Lactobacillus kefiri strain NM180-3, respectively), and acetic acid bacteria ( Acetobacter lovaniensis strain) were entrapped in liquid core capsules based on the distribution ratio in kefir grains. The microbiological, antimicrobial, and chemical properties of kefir made with capsules (M) and kefir grains (K) were measured and compared. According to the results of plate counts in different selective medium, the number of yeasts and bacteria in the liquid core capsules gradually increased and stabilized after eight fermentation cycles. The results of gas chromatography–mass spectrometry showed that almost all the aroma components existed in the two type of kefir, except the ethyl lactate. There was no significant difference in alcohol content, protein content, and fat content, except the acidity and sugar content. Water holding capacity of kefir K was higher than kefir M. There were 14 same free amino acids in kefir M and kefir K, and the content of most free amino acids was similar. In antimicrobial test, there was no significant difference in both kefirs.
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Wei P, Gao JX, Zheng GW, Wu H, Zong MH, Lou WY. Engineering of a novel carbonyl reductase with coenzyme regeneration in E. coli for efficient biosynthesis of enantiopure chiral alcohols. J Biotechnol 2016; 230:54-62. [DOI: 10.1016/j.jbiotec.2016.05.004] [Citation(s) in RCA: 27] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/09/2016] [Revised: 04/24/2016] [Accepted: 05/03/2016] [Indexed: 12/22/2022]
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Chen XH, Wei P, Wang XT, Zong MH, Lou WY. A novel carbonyl reductase with anti-Prelog stereospecificity from Acetobacter sp. CCTCC M209061: purification and characterization. PLoS One 2014; 9:e94543. [PMID: 24740089 PMCID: PMC3989197 DOI: 10.1371/journal.pone.0094543] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/16/2013] [Accepted: 03/18/2014] [Indexed: 11/20/2022] Open
Abstract
A novel carbonyl reductase (AcCR) catalyzing the asymmetric reduction of ketones to enantiopure alcohols with anti-Prelog stereoselectivity was found in Acetobacter sp. CCTCC M209061 and enriched 27.5-fold with an overall yield of 0.4% by purification. The enzyme showed a homotetrameric structure with an apparent molecular mass of 104 kDa and each subunit of 27 kDa. The gene sequence of AcCR was cloned and sequenced, and a 762 bp gene fragment was obtained. Either NAD(H) or NADP(H) can be used as coenzyme. For the reduction of 4'-chloroacetophenone, the Km value for NADH was around 25-fold greater than that for NADPH (0.66 mM vs 0.026 mM), showing that AcCR preferred NADPH over NADH. However, when NADH was used as cofactor, the response of AcCR activity to increasing concentration of 4'-chloroacetophenone was clearly sigmoidal with a Hill coefficient of 3.1, suggesting that the enzyme might possess four substrate-binding sites cooperating with each other The Vmax value for NADH-linked reduction was higher than that for NADPH-linked reduction (0.21 mM/min vs 0.17 mM/min). For the oxidation of isopropanol, the similar enzymological properties of AcCR were found using NAD+ or NADP+ as cofactor. Furthermore, a broad range of ketones such as aryl ketones, α-ketoesters and aliphatic ketones could be enantioselectively reduced into the corresponding chiral alcohols by this enzyme with high activity.
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Affiliation(s)
- Xiao-Hong Chen
- Lab of Applied Biocatalysis, College of Light Industry and Food Sciences, South China University of Technology, Guangzhou, Guangdong, China
| | - Ping Wei
- Lab of Applied Biocatalysis, College of Light Industry and Food Sciences, South China University of Technology, Guangzhou, Guangdong, China
| | - Xiao-Ting Wang
- State Key Laboratory of Pulp and Paper Engineering, South China University of Technology, Guangzhou, Guangdong, China
| | - Min-Hua Zong
- State Key Laboratory of Pulp and Paper Engineering, South China University of Technology, Guangzhou, Guangdong, China
| | - Wen-Yong Lou
- Lab of Applied Biocatalysis, College of Light Industry and Food Sciences, South China University of Technology, Guangzhou, Guangdong, China
- State Key Laboratory of Pulp and Paper Engineering, South China University of Technology, Guangzhou, Guangdong, China
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Wang XT, Yue DM, Zong MH, Lou WY. Use of Ionic Liquid To Significantly Improve Asymmetric Reduction of Ethyl Acetoacetate Catalyzed by Acetobacter sp. CCTCC M209061 Cells. Ind Eng Chem Res 2013. [DOI: 10.1021/ie401561r] [Citation(s) in RCA: 22] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Xiao-Ting Wang
- Laboratory of Applied
Biocatalysis,
School of Light Industry and Food Sciences, South China University of Technology, Guangzhou 510640, Guangdong,
People’s Republic of China
| | - Dong-Mei Yue
- Laboratory of Applied
Biocatalysis,
School of Light Industry and Food Sciences, South China University of Technology, Guangzhou 510640, Guangdong,
People’s Republic of China
| | - Min-Hua Zong
- State Key Laboratory of Pulp
and Paper Engineering, South China University of Technology, Guangzhou 510640, Guangdong, People’s Republic of China
| | - Wen-Yong Lou
- Laboratory of Applied
Biocatalysis,
School of Light Industry and Food Sciences, South China University of Technology, Guangzhou 510640, Guangdong,
People’s Republic of China
- State Key Laboratory of Pulp
and Paper Engineering, South China University of Technology, Guangzhou 510640, Guangdong, People’s Republic of China
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Biocatalytic anti-Prelog stereoselective reduction of ethyl acetoacetate catalyzed by whole cells of Acetobacter sp. CCTCC M209061. J Biotechnol 2013; 163:292-300. [DOI: 10.1016/j.jbiotec.2012.10.023] [Citation(s) in RCA: 27] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/25/2012] [Revised: 10/29/2012] [Accepted: 10/31/2012] [Indexed: 11/17/2022]
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Zhimin O, Xingyuan S, Hanbing S, Hongxia B. Synthesis of Duloxetine Intermediate (S)-3-Chloro-1-(2-thienyl)-1-propanol with Liquid-Core Immobilized Candida pseudotropicalis 104. Appl Biochem Biotechnol 2012; 168:2297-308. [DOI: 10.1007/s12010-012-9938-7] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/04/2012] [Accepted: 10/05/2012] [Indexed: 11/24/2022]
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Zhang BB, Cheng J, Lou WY, Wang P, Zong MH. Efficient anti-Prelog enantioselective reduction of acetyltrimethylsilane to (R)-1-trimethylsilylethanol by immobilized Candida parapsilosis CCTCC M203011 cells in ionic liquid-based biphasic systems. Microb Cell Fact 2012; 11:108. [PMID: 22897972 PMCID: PMC3527300 DOI: 10.1186/1475-2859-11-108] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/23/2012] [Accepted: 06/27/2012] [Indexed: 12/03/2022] Open
Abstract
BACKGROUND Biocatalytic asymmetric reductions with whole cells can offer high enantioselectivity, environmentally benign processes and energy-effective operations and thus are of great interest. The application of whole cell-mediated bioreduction is often restricted if substrate and product have low water solubility and/or high toxicity to the biocatalyst. Many studies have shown that a biphasic system is often useful in this instance. Hence, we developed efficient biphasic reaction systems with biocompatible water-immiscible ionic liquids (ILs), to improve the biocatalytic anti-Prelog enantioselective reduction of acetyltrimethylsilane (ATMS) to (R)-1-trimethylsilylethanol {(R)-1-TMSE}, which is key synthon for a large number of silicon-containing drugs, using immobilized Candida parapsilosis CCTCC M203011 cells as the biocatalyst. RESULTS It was found that the substrate ATMS and the product 1-TMSE exerted pronounced toxicity to immobilized Candida parapsilosis CCTCC M203011 cells. The biocompatible water-immiscible ILs can be applied as a substrate reservoir and in situ extractant for the product, thus greatly enhancing the efficiency of the biocatalytic process and the operational stability of the cells as compared to the IL-free aqueous system. Various ILs exerted significant but different effects on the bioreduction and the performances of biocatalysts were closely related to the kinds and combination of cation and anion of ILs. Among all the water-immiscible ILs investigated, the best results were observed in 1-butyl-3-methylimidazolium hexafluorophosphate (C(4)mim·PF(6))/buffer biphasic system. Furthermore, it was shown that the optimum substrate concentration, volume ratio of buffer to IL, buffer pH, reaction temperature and shaking rate for the bioreduction were 120 mM, 8/1 (v/v), 6.0, 30°C and 180 r/min, respectively. Under these optimized conditions, the initial reaction rate, the maximum yield and the product e.e. were 8.1 μmol/min g(cwm), 98.6% and >99%, respectively. The efficient whole-cell biocatalytic process was shown to be feasible on a 450-mL scale. Moreover, the immobilized cells remained around 87% of their initial activity even after being used repeatedly for 8 batches in the C(4)mim·PF(6)/buffer biphasic system, exhibiting excellent operational stability. CONCLUSIONS For the first time, we have successfully utilized immobilized Candida parapsilosis CCTCC M203011 cells, for efficiently catalyzing anti-Prelog enantioselective reduction of ATMS to enantiopure (R)-1-TMSE in the C(4)mim·PF(6)/buffer biphasic system. The substantially improved biocatalytic process appears to be effective and competitive on a preparative scale.
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Affiliation(s)
- Bo-Bo Zhang
- State Key Laboratory of Pulp and Paper Engineering, South China University of Technology, Guangzhou, 510640, China
- Key Laboratory of Industrial Biotechnology, Ministry of Education, School of Biotechnology, Jiangnan University, Wuxi, 214122, China
| | - Jing Cheng
- Laboratory of Applied Biocatalysis, College of Light Industry and Food Sciences, South China University of Technology, Guangzhou, 510640, China
| | - Wen-Yong Lou
- State Key Laboratory of Pulp and Paper Engineering, South China University of Technology, Guangzhou, 510640, China
- Laboratory of Applied Biocatalysis, College of Light Industry and Food Sciences, South China University of Technology, Guangzhou, 510640, China
| | - Pan Wang
- Laboratory of Applied Biocatalysis, College of Light Industry and Food Sciences, South China University of Technology, Guangzhou, 510640, China
| | - Min-Hua Zong
- Laboratory of Applied Biocatalysis, College of Light Industry and Food Sciences, South China University of Technology, Guangzhou, 510640, China
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Zhang BB, Lou WY, Chen WJ, Zong MH. Efficient asymmetric reduction of 4-(trimethylsilyl)-3-butyn-2-one by Candida parapsilosis cells in an ionic liquid-containing system. PLoS One 2012; 7:e37641. [PMID: 22662183 PMCID: PMC3360755 DOI: 10.1371/journal.pone.0037641] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/21/2012] [Accepted: 04/26/2012] [Indexed: 12/01/2022] Open
Abstract
Hydrophilic ionic liquids (ILs) were employed as green solvents to construct an IL-containing co-solvent system for improving the asymmetric reduction of 4-(trimethylsilyl)-3-butyn-2-one by immobilized Candida parapsilosis cells. Among 14 hydrophilic ILs examined, 1-(2'-hydroxyl)ethyl-3-methylimidazolium nitrate (C(2)OHMIM·NO(3)) was considered as the most suitable IL for the bioreduction with the fastest initial reaction rate, the highest yield and the highest product e.e., which may be due to the good biocompatibility with the cells. For a better understanding of the bioreduction performed in the C(2)OHMIM·NO(3)-containing co-solvent system, the effects of several crucial variables were systematically investigated. The optimal C(2)OHMIM·NO(3) content, substrate concentration, buffer pH, co-substrate concentration and temperature were 10% (v/v), 3.0 mmol/L, 5.0, 98.1 mmol/L and 30°C, respectively. Under the optimal conditions, the initial reaction rate, the maximum yield and the product e.e. were 17.3 µmol/h g(cell), 95.2% and >99.9%, respectively, which are much better than the corresponding results previously reported. Moreover, the immobilized cells remained more than 83% of their initial activity even after being used repeatedly for 10 batches in the C(2)OHMIM·NO(3)-containing system, exhibiting excellent operational stability.
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Affiliation(s)
- Bo-Bo Zhang
- State Key Laboratory of Pulp and Paper Engineering, South China University of Technology, Guangzhou, People's Republic of China
- Key Laboratory of Industrial Biotechnology, Ministry of Education, School of Biotechnology, Jiangnan University, Wuxi, People's Republic of China
| | - Wen-Yong Lou
- State Key Laboratory of Pulp and Paper Engineering, South China University of Technology, Guangzhou, People's Republic of China
| | - Wen-Jing Chen
- State Key Laboratory of Pulp and Paper Engineering, South China University of Technology, Guangzhou, People's Republic of China
| | - Min-Hua Zong
- Laboratory of Applied Biocatalysis, South China University of Technology, Guangzhou, People's Republic of China
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Chen XH, Lou WY, Zong MH, Smith TJ. Optimization of culture conditions to produce high yields of active Acetobacter sp. CCTCC M209061 cells for anti-Prelog reduction of prochiral ketones. BMC Biotechnol 2011; 11:110. [PMID: 22099947 PMCID: PMC3341575 DOI: 10.1186/1472-6750-11-110] [Citation(s) in RCA: 21] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/22/2011] [Accepted: 11/20/2011] [Indexed: 12/02/2022] Open
Abstract
Background Chiral alcohols are widely used in the synthesis of chiral pharmaceuticals, flavors and functional materials and appropriate whole-cell biocatalysts offer a highly enantioselective, minimally polluting route to these valuable compounds. The recently isolated strain Acetobacter sp. CCTCC M209061 showed exclusive anti-Prelog stereoselectivity for the reduction of prochiral ketones, but the low biomass has limited its commercialization and industrial applications. To tackle this problem, the effects of medium components and culture conditions on the strain's growth and reduction activity were explored. Results By using a one-at-a-time method and a central composite rotatable design (CCRD), the optimal medium and culture conditions were found to be as follows: glucose 8.26 g/L, fructose 2.50 g/L, soy peptone 83.92 g/L, MnSO4·H2O 0.088 g/L, pH 5.70, 30°C and 10% (v/v) inoculum. Under the above-mentioned conditions, the biomass after 30 h cultivation reached 1.10 ± 0.03 g/L, which was 9.5-fold higher than that obtained with basic medium. Also, the reduction activity towards 4'-chloroacetophenone was markedly enhanced to 39.49 ± 0.96 μmol/min/g from 29.34 ± 0.65 μmol/min/g, with the product e.e. being above 99%. Comparable improvements were also seen with the enantioselective bioreduction of 4-(trimethylsilyl)-3-butyn-2-one to the key pharmaceutical precursor (R) - 4-(trimethylsilyl)-3-butyn-2-ol. Conclusions The biomass and reduction activity of Acetobacter sp. CCTCC M209061 can be greatly enhanced through the optimization strategy. This facilitates use of the strain in the anti-Prelog stereoselective reduction of prochiral ketones to enantiopure chiral alcohols as building blocks for many industries.
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Affiliation(s)
- Xiao-Hong Chen
- Lab of Applied Biocatalysis, South China University of Technology, Guangzhou, 510640, China
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Ou ZM, Shi HB, Sun XY, Shen WH. Synthesis of S-licarbazepine by asymmetric reduction of oxcarbazepine with Saccharomyces cerevisiae CGMCC No. 2266. ACTA ACUST UNITED AC 2011. [DOI: 10.1016/j.molcatb.2011.07.004] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
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Xiao ZJ, Zong MH, Lou WY. Highly enantioselective reduction of 4-(trimethylsilyl)-3-butyn-2-one to enantiopure (R)-4-(trimethylsilyl)-3-butyn-2-ol using a novel strain Acetobacter sp. CCTCC M209061. BIORESOURCE TECHNOLOGY 2009; 100:5560-5565. [PMID: 19564106 DOI: 10.1016/j.biortech.2009.06.006] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/04/2009] [Revised: 05/31/2009] [Accepted: 06/02/2009] [Indexed: 05/28/2023]
Abstract
The biocatalytic reduction of 4-(trimethylsilyl)-3-butyn-2-one to enantiopure (R)-4-(trimethylsilyl)-3-butyn-2-ol was successfully conducted with high enantioselectivity using immobilized whole cells of a novel strain Acetobacter sp. CCTCC M209061, newly isolated from kefir. Compared with other microorganisms that were investigated, Acetobacter sp. CCTCC M209061 was shown to be more effective for the bioreduction reaction, and afforded much higher yield and product enantiomeric excess (e.e.). The optimal buffer pH, co-substrate concentration, reaction temperature, substrate concentration and shaking rate were 5.0, 130.6 mM, 30 degrees C, 6.0 mM and 180 r/min, respectively. Under the optimized conditions, the maximum yield and the product e.e. were 71% and >99%, respectively, which are much higher than those reported previously. Additionally, the established biocatalytic system proved to be efficient for the bioreduction of acetyltrimethylsilane to (R)-1-trimethylsilylethanol with excellent yield and product e.e. The immobilized cells manifested a good operational stability under the above reaction conditions since they retained 70% of their catalytic activity after ten cycles of use.
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Affiliation(s)
- Zi-Jun Xiao
- State Key Laboratory of Pulp and Paper Engineering, College of Light Industry and Food Sciences, South China University of Technology, Guangzhou 510640, China
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Lou WY, Chen L, Zhang BB, Smith TJ, Zong MH. Using a water-immiscible ionic liquid to improve asymmetric reduction of 4-(trimethylsilyl)-3-butyn-2-one catalyzed by immobilized Candida parapsilosis CCTCC M203011 cells. BMC Biotechnol 2009; 9:90. [PMID: 19849833 PMCID: PMC2790445 DOI: 10.1186/1472-6750-9-90] [Citation(s) in RCA: 32] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/04/2009] [Accepted: 10/22/2009] [Indexed: 12/02/2022] Open
Abstract
Background Whole cells are usually employed for biocatalytic reduction reactions to ensure efficient coenzyme regeneration and to avoid problems with enzyme purification and stability. The efficiency of whole cell-catalyzed bioreduction is frequently restricted by pronounced toxicity of substrate and/or product to the microbial cells and in many instances the use of two-phase reaction systems can solve such problems. Therefore, we developed new, biphasic reaction systems with biocompatible water-immiscible ionic liquids (ILs) as alternatives to conventional organic solvents, in order to improve the asymmetric reduction of 4-(trimethylsilyl)-3-butyn-2-one (TMSB) to (S)-4-(trimethylsilyl)-3-butyn-2-ol {(S)-TMSBOL}, a key intermediate for synthesis of 5-lipoxygenase inhibitors, using immobilized Candida parapsilosis CCTCC M203011 cells as the biocatalyst. Results Various ILs exerted significant but different effects on the bioreduction. Of all the tested water-immiscible ILs, the best results were observed with 1-butyl-3-methylimidazolium hexafluorophosphate (C4MIM·PF6), which exhibited not only good biocompatibility with the cells but also excellent solvent properties for the toxic substrate and product, thus markedly improving the efficiency of the bioreduction and the operational stability of the cells as compared to the IL-free aqueous system. 2-Propanol was shown to be the most suitable co-substrate for coenzyme regeneration, and it was found that the optimum volume ratio of buffer to C4MIM·PF6, substrate concentration, buffer pH, 2-propanol concentration and reaction temperature were 4/1 (v/v), 24 mM, 5.5, 130 mM and 30°C, respectively. Under these optimized conditions, the maximum yield and the product e.e. wer 97.7% and >99%, respectively, which are much higher than the corresponding values previously reported. The efficient whole-cell biocatalytic process was shown to be feasible on a 250-mL scale. Conclusion The whole cell-catalyzed asymmetric reduction of TMSB to (S)-TMSBOL can be substantially improved by using a C4MIM·PF6/buffer biphasic system instead of a single-phase aqueous system and the resulting biocatalytic process appears to be effective and competitive on a preparative scale.
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Affiliation(s)
- Wen-Yong Lou
- State Key Laboratory of Pulp and Paper Engineering, College of Light Industry & Food Sciences, South China University of Technology, Guangzhou 510640, PR China.
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Ravía SP, Carrera I, Seoane GA, Vero S, Gamenara D. Novel fungi-catalyzed reduction of α-alkyl-β-keto esters. ACTA ACUST UNITED AC 2009. [DOI: 10.1016/j.tetasy.2009.05.031] [Citation(s) in RCA: 13] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
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Current awareness on yeast. Yeast 2009. [DOI: 10.1002/yea.1618] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022] Open
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Zong MH, Xiao ZJ, Peng L. Efficient microbial asymmetric reduction of 4-(trimethylsilyl)-3-butyn-2-one. J Biotechnol 2008. [DOI: 10.1016/j.jbiotec.2008.07.877] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/21/2022]
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