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Geng K, Lin Y, Zheng X, Li C, Chen S, Ling H, Yang J, Zhu X, Liang S. Enhanced Expression of Alcohol Dehydrogenase I in Pichia pastoris Reduces the Content of Acetaldehyde in Wines. Microorganisms 2023; 12:38. [PMID: 38257867 PMCID: PMC10820543 DOI: 10.3390/microorganisms12010038] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/05/2023] [Revised: 12/16/2023] [Accepted: 12/19/2023] [Indexed: 01/24/2024] Open
Abstract
Acetaldehyde is an important carbonyl compound commonly detected in wines. A high concentration of acetaldehyde can affect the flavor of wines and result in adverse effects on human health. Alcohol dehydrogenase I (ADH1) in Saccharomyces cerevisiae catalyzes the reduction reaction of acetaldehyde into ethanol in the presence of cofactors, showing the potential to reduce the content of acetaldehyde in wines. In this study, ADH1 was successfully expressed in Pichia pastoris GS115 based on codon optimization. Then, the expression level of ADH1 was enhanced by replacing its promoter with optimized promoters and increasing the copy number of the expression cassette, with ADH1 being purified using nickel column affinity chromatography. The enzymatic activity of purified ADH1 reached 605.44 ± 44.30 U/mg. The results of the effect of ADH1 on the content of acetaldehyde in wine revealed that the acetaldehyde content of wine samples was reduced from 168.05 ± 0.55 to 113.17 ± 6.08 mg/L with the addition of 5 mM NADH and the catalysis of ADH1, and from 135.53 ± 4.08 to 52.89 ± 2.20 mg/L through cofactor regeneration. Our study provides a novel approach to reducing the content of acetaldehyde in wines through enzymatic catalysis.
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Affiliation(s)
- Kun Geng
- School of Biology and Biological Engineering, South China University of Technology, Guangzhou 510006, China
- Guangdong Provincial Key Laboratory of Fermentation and Enzyme Engineering, South China University of Technology, Guangzhou 510006, China
| | - Ying Lin
- School of Biology and Biological Engineering, South China University of Technology, Guangzhou 510006, China
- Guangdong Provincial Key Laboratory of Fermentation and Enzyme Engineering, South China University of Technology, Guangzhou 510006, China
| | - Xueyun Zheng
- School of Biology and Biological Engineering, South China University of Technology, Guangzhou 510006, China
- Guangdong Provincial Key Laboratory of Fermentation and Enzyme Engineering, South China University of Technology, Guangzhou 510006, China
- Key Laboratory of Fermentation Engineering of Ministry of Education, School of Biological Engineering and Food, Hubei University of Technology, Wuhan 430068, China
| | - Cheng Li
- Department of Biology, Massachusetts Institute of Technology, Cambridge, MA 02139, USA
| | - Shuting Chen
- School of Biology and Biological Engineering, South China University of Technology, Guangzhou 510006, China
- Guangdong Provincial Key Laboratory of Fermentation and Enzyme Engineering, South China University of Technology, Guangzhou 510006, China
| | - He Ling
- School of Biology and Biological Engineering, South China University of Technology, Guangzhou 510006, China
- Guangdong Provincial Key Laboratory of Fermentation and Enzyme Engineering, South China University of Technology, Guangzhou 510006, China
| | - Jun Yang
- School of Biology and Biological Engineering, South China University of Technology, Guangzhou 510006, China
- Guangdong Provincial Key Laboratory of Fermentation and Enzyme Engineering, South China University of Technology, Guangzhou 510006, China
| | - Xiangyu Zhu
- School of Biology and Biological Engineering, South China University of Technology, Guangzhou 510006, China
- Guangdong Provincial Key Laboratory of Fermentation and Enzyme Engineering, South China University of Technology, Guangzhou 510006, China
| | - Shuli Liang
- School of Biology and Biological Engineering, South China University of Technology, Guangzhou 510006, China
- Guangdong Provincial Key Laboratory of Fermentation and Enzyme Engineering, South China University of Technology, Guangzhou 510006, China
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Gallego Del Sol F, Quiles-Puchalt N, Brady A, Penadés JR, Marina A. Insights into the mechanism of action of the arbitrium communication system in SPbeta phages. Nat Commun 2022; 13:3627. [PMID: 35750663 PMCID: PMC9232636 DOI: 10.1038/s41467-022-31144-3] [Citation(s) in RCA: 4] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/20/2021] [Accepted: 06/01/2022] [Indexed: 11/09/2022] Open
Abstract
The arbitrium system is employed by phages of the SPbeta family to communicate with their progeny during infection to decide either to follow the lytic or the lysogenic cycle. The system is controlled by a peptide, AimP, that binds to the regulator AimR, inhibiting its DNA-binding activity and expression of aimX. Although the structure of AimR has been elucidated for phages SPβ and phi3T, there is still controversy regarding the molecular mechanism of AimR function, with two different proposed models for SPβ. In this study, we deepen our understanding of the system by solving the structure of an additional AimR that shows chimerical characteristics with the SPβ receptor. The crystal structures of this AimR (apo, AimP-bound and DNA-bound) together with in vitro and in vivo analyses confirm a mechanism of action by AimP-induced conformational restriction, shedding light on peptide specificity and cross regulation with relevant biological implications.
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Affiliation(s)
- Francisca Gallego Del Sol
- Instituto de Biomedicina de Valencia (IBV), CSIC and CIBER de Enfermedades Raras (CIBERER), Valencia, Spain
| | - Nuria Quiles-Puchalt
- MRC Centre for Molecular Bacteriology and Infection, Imperial College London, London, UK
| | - Aisling Brady
- MRC Centre for Molecular Bacteriology and Infection, Imperial College London, London, UK
- Institute of Infection, Immunity and Inflammation, College of Medical, Veterinary and Life Sciences, University of Glasgow, Glasgow, UK
| | - José R Penadés
- MRC Centre for Molecular Bacteriology and Infection, Imperial College London, London, UK.
| | - Alberto Marina
- Instituto de Biomedicina de Valencia (IBV), CSIC and CIBER de Enfermedades Raras (CIBERER), Valencia, Spain.
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Jia D, He M, Tian Y, Shen S, Zhu X, Wang Y, Zhuang Y, Jiang W, Gu Y. Metabolic Engineering of Gas-Fermenting Clostridium ljungdahlii for Efficient Co-production of Isopropanol, 3-Hydroxybutyrate, and Ethanol. ACS Synth Biol 2021; 10:2628-2638. [PMID: 34549587 DOI: 10.1021/acssynbio.1c00235] [Citation(s) in RCA: 12] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
Rational design and modification of autotrophic bacteria to efficiently produce high-value chemicals and biofuels are crucial for establishing a sustainable and economically viable process for one-carbon (C1) source utilization, which, however, remains a challenge in metabolic engineering. In this study, autotrophic Clostridium ljungdahlii was metabolically engineered to efficiently co-produce three important bulk chemicals, isopropanol, 3-hydroxybutyrate (3-HB), and ethanol (together, IHE), using syngas (CO2/CO). An artificial isopropanol-producing pathway was first constructed and optimized in C. ljungdahlii to achieve an efficient production of isopropanol and an unexpected product, 3-HB. Based on this finding, an endogenous active dehydrogenase capable of converting acetoacetate to 3-HB was identified in C. ljungdahlii, thereby revealing an efficient 3-HB-producing pathway. The engineered strain was further optimized to reassimilate acetic acid and synthesize 3-HB by introducing heterologous functional genes. Finally, the best-performing strain was able to produce 13.4, 3.0, and 28.4 g/L of isopropanol, 3-HB, and ethanol, respectively, in continuous gas fermentation. Therefore, this work represents remarkable progress in microbial production of bulk chemicals using C1 gases.
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Affiliation(s)
- Dechen Jia
- Key Laboratory of Synthetic Biology, The State Key Laboratory of Plant Carbon-Nitrogen Assimilation, CAS Center for Excellence in Molecular Plant Sciences, Shanghai Institute of Plant Physiology and Ecology, Chinese Academy of Sciences, Shanghai 200032, China
- University of Chinese Academy of Sciences, Beijing 100049, China
| | - Meiyu He
- Key Laboratory of Synthetic Biology, The State Key Laboratory of Plant Carbon-Nitrogen Assimilation, CAS Center for Excellence in Molecular Plant Sciences, Shanghai Institute of Plant Physiology and Ecology, Chinese Academy of Sciences, Shanghai 200032, China
- Key Laboratory of Plant Stress Biology, State Key Laboratory of Cotton Biology, School of Life Sciences, Henan University, Kaifeng 475004, China
| | - Yi Tian
- Key Laboratory of Synthetic Biology, The State Key Laboratory of Plant Carbon-Nitrogen Assimilation, CAS Center for Excellence in Molecular Plant Sciences, Shanghai Institute of Plant Physiology and Ecology, Chinese Academy of Sciences, Shanghai 200032, China
- Key Laboratory of Plant Stress Biology, State Key Laboratory of Cotton Biology, School of Life Sciences, Henan University, Kaifeng 475004, China
| | - Shaohuang Shen
- State Key Laboratory of Bioreactor Engineering, East China University of Science and Technology, Shanghai 200237, China
| | - Xianfeng Zhu
- Key Laboratory of Plant Stress Biology, State Key Laboratory of Cotton Biology, School of Life Sciences, Henan University, Kaifeng 475004, China
| | - Yonghong Wang
- State Key Laboratory of Bioreactor Engineering, East China University of Science and Technology, Shanghai 200237, China
| | - Yingping Zhuang
- State Key Laboratory of Bioreactor Engineering, East China University of Science and Technology, Shanghai 200237, China
| | - Weihong Jiang
- Key Laboratory of Synthetic Biology, The State Key Laboratory of Plant Carbon-Nitrogen Assimilation, CAS Center for Excellence in Molecular Plant Sciences, Shanghai Institute of Plant Physiology and Ecology, Chinese Academy of Sciences, Shanghai 200032, China
| | - Yang Gu
- Key Laboratory of Synthetic Biology, The State Key Laboratory of Plant Carbon-Nitrogen Assimilation, CAS Center for Excellence in Molecular Plant Sciences, Shanghai Institute of Plant Physiology and Ecology, Chinese Academy of Sciences, Shanghai 200032, China
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Birchfield AS, McIntosh CA. The Effect of Recombinant Tags on Citrus paradisi Flavonol-Specific 3-O Glucosyltransferase Activity. PLANTS 2020; 9:plants9030402. [PMID: 32213838 PMCID: PMC7154896 DOI: 10.3390/plants9030402] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 03/11/2020] [Revised: 03/21/2020] [Accepted: 03/22/2020] [Indexed: 11/16/2022]
Abstract
Recombinant tags are used extensively in protein expression systems to allow purification through IMAC (Immobilized Metal Affinity Chromatography), identification through Western blot, and to facilitate crystal formation for structural analysis. While widely used, their role in enzyme characterization has raised concerns with respect to potential impact on activity. In this study, a flavonol-specific 3-O glucosyltransferase (Cp3GT) from grapefruit (Citrus paradisi) was expressed in Pichia pastoris, and was assayed in its untagged form and with a C-terminal c-myc/6x His tag under various conditions to determine the effect of tags. Prior characterization of pH optima for Cp3GT obtained through expression in Escherichia coli, containing an N-terminal thioredoxin/6x His tag, indicated an optimal pH of 7-7.5, which is indicative of a normal physiological pH and agrees with other glucosyltransferase (GT) pH optima. However, characterization of Cp3GT expressed using P. pastoris with a C-terminal c-myc-6x His tag showed a higher optimal pH of 8.5-9. This suggests a possible tag effect or an effect related to physiological differences between the cell expression systems. Results testing recombinant Cp3GT expressed in Pichia with and without C-terminal tags showed a possible tag effect with regard to substrate preference and interactions with metals, but no apparent effect on enzymatic kinetics or pH optima.
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Meng L, Liu Y, Yin X, Zhou H, Wu J, Wu M, Yang L. Effects of His-tag on Catalytic Activity and Enantioselectivity of Recombinant Transaminases. Appl Biochem Biotechnol 2019; 190:880-895. [PMID: 31515673 DOI: 10.1007/s12010-019-03117-8] [Citation(s) in RCA: 13] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/21/2019] [Accepted: 08/25/2019] [Indexed: 11/27/2022]
Abstract
Recombinant proteins were often expressed with His-tag to simplify the purification process. Among them, transaminase was mostly expressed with fusion tags and widely used in the production of numerous amino moieties. However, the existence of the His-tag has been reported to affect various properties of different recombinant enzymes, while the effect on transaminase was rarely studied. In this paper, we investigated the effect of His-tag on transaminase based on the various activities of 4-aminobutyrate-2-oxoglutarate transaminase (GabT) when it was expressed in vector pETDuet-1. We found that His-tag did not affect the enantioselectivity, but decreased the catalytic activity to different extents according to its existence and location. Native GabT maintained the highest catalytic activity; GabT with C-terminal His-tag showed slightly lower activity than native GabT but about 2.2-fold higher than GabT with N-terminal His-tag. Besides, other fusion tags like T7-tag and S-tag inserted between N-His-tag and GabT can relieve the decreasing effect of His-tag on GabT activity. Furthermore, whole cell catalytic activity of several transaminases was improved by deleting the N-terminal His-tag. This study provided a strategy for the efficient expression of recombinant transaminase with improved catalytic activity and might attract attention to the effect of His-tag on other enzymatic properties.
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Affiliation(s)
- Lijun Meng
- Institute of Biological Engineering, College of Chemical and Biological Engineering, Zhejiang University, Hangzhou, 310027, China
| | - Yayun Liu
- Institute of Biological Engineering, College of Chemical and Biological Engineering, Zhejiang University, Hangzhou, 310027, China
| | - Xinjian Yin
- Institute of Biological Engineering, College of Chemical and Biological Engineering, Zhejiang University, Hangzhou, 310027, China
| | - Haisheng Zhou
- Institute of Biological Engineering, College of Chemical and Biological Engineering, Zhejiang University, Hangzhou, 310027, China
| | - Jianping Wu
- Institute of Biological Engineering, College of Chemical and Biological Engineering, Zhejiang University, Hangzhou, 310027, China
| | - Mianbin Wu
- Institute of Biological Engineering, College of Chemical and Biological Engineering, Zhejiang University, Hangzhou, 310027, China
| | - Lirong Yang
- Institute of Biological Engineering, College of Chemical and Biological Engineering, Zhejiang University, Hangzhou, 310027, China.
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Structure-based Mutational Studies of D-3-hydroxybutyrate Dehydrogenase for Substrate Recognition of Aliphatic Hydroxy Acids with a Variable Length of Carbon Chain. BIOTECHNOL BIOPROC E 2019. [DOI: 10.1007/s12257-019-0135-1] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/13/2023]
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Wu Y, Ma Y, Li L, Yang X. Functional Expression, Purification and Identification of Modified Antioxidant Peptides from Pinctada fucata Muscle. Int J Pept Res Ther 2019. [DOI: 10.1007/s10989-018-9691-z] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/17/2022]
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9
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Rigi G, Ghaedmohammadi S, Ahmadian G. A comprehensive review on staphylococcal protein A (SpA): Its production and applications. Biotechnol Appl Biochem 2019; 66:454-464. [PMID: 30869160 DOI: 10.1002/bab.1742] [Citation(s) in RCA: 21] [Impact Index Per Article: 4.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/14/2019] [Accepted: 03/13/2019] [Indexed: 01/09/2023]
Abstract
The Staphylococcus aureus protein A (SpA) can be obtained through the culture of wild-type S. aureus and also as a recombinant protein in safe bacterial hosts. Several methods have been used to purify SpA among which ion-exchange chromatography, affinity chromatography, gel filtration, and per aqueous liquid chromatography (PALC) are common. SpA has a wide range of biochemical, biotechnological, and medical applications and is most commonly used in test methods such as immunoprecipitation, enzyme-linked immunosorbent assay, and Western blotting. SpA has also been widely utilized in pharmaceutical applications to bind to immune complexes and serum immunoglobulins. SpA also directly binds to the B-cells preventing initiation of infectious diseases as well as having a role in the development of various autoimmune diseases. This review considers different applications of SpA in biotechnology and its novel clinical application for effective treatment of autoimmune diseases. It also discusses various strategies for expression and purification of the SpA including types of column chromatography that are commonly used in protein purification and developing SpA surface display technologies. Finally, this review highlights the potential and novel applications of SpA immobilization, SpA typing, protein engineering for further development of immunological and biochemical research, and also application of SpA as a diagnostic biosensor.
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Affiliation(s)
- Garshasb Rigi
- Department of Genetics, Faculty of Basic Science, Shahrekord University, Shahrekord, 881 863 4141, Iran.,Department of Industrial Biotechnology, Research Institute of Biotechnology, Shahrekord University, Shahrekord, Iran
| | - Samira Ghaedmohammadi
- Department of Cellular and Molecular Biology, Estahban Higher Education Center, Estahban, Iran
| | - Gholamreza Ahmadian
- Associate Professor, Department of Industrial and Environmental Biotechnology, National Institute of Genetic Engineering and Biotechnology (NIGEB), Tehran, Iran
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Liang B, Huang X, Teng Y, Liang Y, Yang Y, Zheng L, Lu X. Enhanced Single-Step Bioproduction of the Simvastatin Precursor Monacolin J in an Industrial Strain ofAspergillus terreusby Employing the Evolved Lovastatin Hydrolase. Biotechnol J 2018; 13:e1800094. [DOI: 10.1002/biot.201800094] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/08/2018] [Revised: 04/03/2018] [Indexed: 12/17/2022]
Affiliation(s)
- Bo Liang
- Shandong Provincial Key Laboratory of Synthetic Biology; Qingdao Institute of Bioenergy and Bioprocess Technology; Chinese Academy of Sciences; Qingdao 266101 China
- University of Chinese Academy of Sciences; Beijing 100049 China
| | - Xuenian Huang
- Shandong Provincial Key Laboratory of Synthetic Biology; Qingdao Institute of Bioenergy and Bioprocess Technology; Chinese Academy of Sciences; Qingdao 266101 China
| | - Yun Teng
- Zhejiang Key Laboratory of Antifungal Drugs; Zhejiang Hisun Pharmaceutical Co., Ltd.; Taizhou 318000 China
| | - Yajing Liang
- Shandong Provincial Key Laboratory of Synthetic Biology; Qingdao Institute of Bioenergy and Bioprocess Technology; Chinese Academy of Sciences; Qingdao 266101 China
- Key Laboratory of Biofuels; Qingdao Institute of Bioenergy and Bioprocess Technology; Chinese Academy of Sciences; Qingdao 266101 China
| | - Yong Yang
- Zhejiang Key Laboratory of Antifungal Drugs; Zhejiang Hisun Pharmaceutical Co., Ltd.; Taizhou 318000 China
| | - Linghui Zheng
- Zhejiang Key Laboratory of Antifungal Drugs; Zhejiang Hisun Pharmaceutical Co., Ltd.; Taizhou 318000 China
| | - Xuefeng Lu
- Shandong Provincial Key Laboratory of Synthetic Biology; Qingdao Institute of Bioenergy and Bioprocess Technology; Chinese Academy of Sciences; Qingdao 266101 China
- Key Laboratory of Biofuels; Qingdao Institute of Bioenergy and Bioprocess Technology; Chinese Academy of Sciences; Qingdao 266101 China
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Removal of Feedback Inhibition of Corynebacterium glutamicum Phosphoenolpyruvate Carboxylase by Addition of a Short Terminal Peptide. BIOTECHNOL BIOPROC E 2018. [DOI: 10.1007/s12257-017-0313-y] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/17/2022]
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12
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Efficient heterologous expression, functional characterization and molecular modeling of annular seabream digestive phospholipase A2. Chem Phys Lipids 2018. [DOI: 10.1016/j.chemphyslip.2017.06.004] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/08/2023]
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13
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Zhang R, Wang L, Xu Y, Liang H, Zhou X, Jiang J, Li Y, Xiao R, Ni Y. In situ expression of (R)-carbonyl reductase rebalancing an asymmetric pathway improves stereoconversion efficiency of racemic mixture to (S)-phenyl-1,2-ethanediol in Candida parapsilosis CCTCC M203011. Microb Cell Fact 2016; 15:143. [PMID: 27534936 PMCID: PMC4989518 DOI: 10.1186/s12934-016-0539-y] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/21/2016] [Accepted: 08/03/2016] [Indexed: 12/05/2022] Open
Abstract
Background Candida parapsilosis (R)-carbonyl reductase (RCR) and (S)-carbonyl reductase (SCR) are involved in the stereoconversion of racemic (R,S)-1-phenyl-1,2-ethanediol (PED) to its (S)-isomer. RCR catalyzes (R)-PED to 2-hydroxyacetophenone (2-HAP), and SCR catalyzes 2-HAP to (S)-PED. However, the stereoconversion efficiency of racemic mixture to (S)-PED is not high because of an activity imbalance between RCR and SCR, with RCR performing at a lower rate than SCR. To realize the efficient preparation of racemic mixture to (S)-PED, an in situ expression of RCR and a two-stage control strategy were introduced to rebalance the RCR- and SCR-mediated pathways. Results An in situ expression plasmid pCP was designed and RCR was successfully expressed in C. parapsilosis. With respect to wild-type, recombinant C. parapsilosis/pCP-RCR exhibited over four-fold higher activity for catalyzing racemic (R,S)-PED to 2-HAP, while maintained the activity for catalyzing 2-HAP to (S)-PED. The ratio of kcat/KM for SCR catalyzing (R)-PED and RCR catalyzing 2-HAP was about 1.0, showing the good balance between the functions of SCR and RCR. Based on pH and temperature preferences of RCR and SCR, a two-stage control strategy was devised, where pH and temperature were initially set at 5.0 and 30 °C for RCR rapidly catalyzing racemic PED to 2-HAP, and then adjusted to 4.5 and 35 °C for SCR transforming 2-HAP to (S)-PED. Using these strategies, the recombinant C. parapsilosis/pCP-RCR catalyzed racemic PED to its (S)-isomer with an optical purity of 98.8 % and a yield of 48.4 %. Most notably, the biotransformation duration was reduced from 48 to 13 h. Conclusions We established an in situ expression system for RCR in C. parapsilosis to rebalance the functions between RCR and SCR. Then we designed a two-stage control strategy based on pH and temperature preferences of RCR and SCR, better rebalancing RCR and SCR-mediated chiral biosynthesis pathways. This work demonstrates a method to improve chiral biosyntheses via in situ expression of rate-limiting enzyme and a multi-stage control strategy to rebalance asymmetric pathways. Electronic supplementary material The online version of this article (doi:10.1186/s12934-016-0539-y) contains supplementary material, which is available to authorized users.
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Affiliation(s)
- Rongzhen Zhang
- Key Laboratory of Industrial Biotechnology of Ministry of Education and School of Biotechnology, Jiangnan University, Wuxi, 214122, People's Republic of China. .,National Key Laboratory for Food Science, Jiangnan University, Wuxi, 214122, People's Republic of China. .,School of Biotechnology, Jiangnan University, 1800 Lihu Avenue, Wuxi, 214122, People's Republic of China.
| | - Lei Wang
- Key Laboratory of Industrial Biotechnology of Ministry of Education and School of Biotechnology, Jiangnan University, Wuxi, 214122, People's Republic of China
| | - Yan Xu
- Key Laboratory of Industrial Biotechnology of Ministry of Education and School of Biotechnology, Jiangnan University, Wuxi, 214122, People's Republic of China. .,National Key Laboratory for Food Science, Jiangnan University, Wuxi, 214122, People's Republic of China. .,School of Biotechnology, Jiangnan University, 1800 Lihu Avenue, Wuxi, 214122, People's Republic of China.
| | - Hongbo Liang
- Key Laboratory of Industrial Biotechnology of Ministry of Education and School of Biotechnology, Jiangnan University, Wuxi, 214122, People's Republic of China
| | - Xiaotian Zhou
- Key Laboratory of Industrial Biotechnology of Ministry of Education and School of Biotechnology, Jiangnan University, Wuxi, 214122, People's Republic of China
| | - Jiawei Jiang
- Key Laboratory of Industrial Biotechnology of Ministry of Education and School of Biotechnology, Jiangnan University, Wuxi, 214122, People's Republic of China
| | - Yaohui Li
- Key Laboratory of Industrial Biotechnology of Ministry of Education and School of Biotechnology, Jiangnan University, Wuxi, 214122, People's Republic of China
| | - Rong Xiao
- Center for Advanced Biotechnology and Medicine, Rutgers University, Piscataway, NJ, 08854, USA
| | - Ye Ni
- Key Laboratory of Industrial Biotechnology of Ministry of Education and School of Biotechnology, Jiangnan University, Wuxi, 214122, People's Republic of China
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Yedahalli SS, Rehmann L, Bassi A. Expression of exo-inulinase gene from Aspergillus niger 12 in E. coli strain Rosetta-gami B (DE3) and its characterization. Biotechnol Prog 2016; 32:629-37. [PMID: 26833959 DOI: 10.1002/btpr.2238] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/05/2014] [Revised: 01/27/2016] [Indexed: 11/08/2022]
Abstract
Inulin is a linear carbohydrate polymer of fructose subunits (2-60) with terminal glucose units, produced as carbon storage in selected plants. It cannot directly be taken up by most microorganisms due to its large size, unless prior hydrolysis through inulinase enzymes occurs. The hydrolyzed inulin can be taken up by microbes and/or recovered and used industrially for the production of high fructose syrup, inulo-oligosaccharides, biofuel, and nutraceuticals. Cell-free enzymatic hydrolysis would be desirable for industrial applications, hence the recombinant expression, purification and characterization of an Aspergillus niger derived exo-inulinase was investigated in this study. The eukaroyototic exo-inulinase of Aspergillus niger 12 has been expressed, for the first time, in an E. coli strain [Rosetta-gami B (DE3)]. The molecular weight of recombinant exo-inulinase was estimated to be ∼81 kDa. The values of Km and Vmax of the recombinant exo-inulinase toward inulin were 5.3 ± 1.1 mM and 402.1 ± 53.1 µmol min(-1) mg(-1) protein, respectively. Towards sucrose the corresponding values were 12.20 ± 1.6 mM and 902.8 ± 40.2 µmol min(-1) mg(-1) protein towards sucrose. The S/I ratio was 2.24 ± 0.7, which is in the range of native inulinase. The optimum temperature and pH of the recombinant exo-inulinase towards inulin was 55°C and 5.0, while they were 50°C and 5.5 towards sucrose. The recombinant exo-inulinase activity towards inulin was enhanced by Cu(2+) and reduced by Fe(2+) , while its activity towards sucrose was enhanced by Co(2+) and reduced by Zn(2+) . © 2016 American Institute of Chemical Engineers Biotechnol. Prog., 32:629-637, 2016.
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Affiliation(s)
- Shreyas S Yedahalli
- Dept. of Chemical and Biochemical Engineering, University of Western Ontario, London, Ontario, N6A 5B9, Canada
| | - Lars Rehmann
- Dept. of Chemical and Biochemical Engineering, Faculty of Engineering, University of Western Ontario, London, Ontario, N6A 5B9, Canada
| | - Amarjeet Bassi
- Dept. of Chemical and Biochemical Engineering, Faculty of Engineering, University of Western Ontario, London, Ontario, N6A 5B9, Canada
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Kamkaew M, Chimnaronk S. Characterization of soluble RNA-dependent RNA polymerase from dengue virus serotype 2: The polyhistidine tag compromises the polymerase activity. Protein Expr Purif 2015; 112:43-9. [DOI: 10.1016/j.pep.2015.04.008] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/14/2015] [Revised: 04/19/2015] [Accepted: 04/20/2015] [Indexed: 12/12/2022]
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