1
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Fang S, Wang Z, Xiao L, Meng Y, Lei Y, Liang T, Chen Y, Zhou X, Xu G, Yang L, Zheng W, Wu J. Thermostability and activity improvement in l-threonine aldolase through targeted mutations in V-shaped subunit. Int J Biol Macromol 2024; 278:134994. [PMID: 39181367 DOI: 10.1016/j.ijbiomac.2024.134994] [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: 05/27/2024] [Revised: 08/11/2024] [Accepted: 08/21/2024] [Indexed: 08/27/2024]
Abstract
l-threonine aldolase (LTA) catalyzes the synthesis of β-hydroxy-α-amino acids, which are important chiral intermediates widely used in the fields of pharmaceuticals and pesticides. However, the limited thermostability of LTA hinders its industrial application. Furthermore, the trade-off between thermostability and activity presents a challenge in the thermostability engineering of this enzyme. This study proposes a strategy to regulate the rigidity of LTA's V-shaped subunit by modifying its opening and hinge regions, distant from the active center, aiming to mitigate the trade-off. With LTA from Bacillus nealsonii as targeted enzyme, a total of 25 residues in these two regions were investigated by directed evolution. Finally, mutant G85A/M207L/A12C was obtained, showing significantly enhanced thermostability with a 20 °C increase in T5060 to 66 °C, and specific activity elevated by 34 % at the optimum temperature. Molecular dynamics simulations showed that the newly formed hydrophobicity and hydrogen bonds improved the thermostability and boosted proton transfer efficiency. This work enhances the thermostability of LTA while preventing the loss of activity. It opens new avenues for the thermostability engineering of other industrially relevant enzymes with active center located at the interface of subunits or domains.
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Affiliation(s)
- Sai Fang
- Institute of Bioengineering, College of Chemical and Biological Engineering, Zhejiang University, Hangzhou 310058, China
| | - Zhe Wang
- Institute of Bioengineering, College of Chemical and Biological Engineering, Zhejiang University, Hangzhou 310058, China
| | - Lanxin Xiao
- Institute of Bioengineering, College of Chemical and Biological Engineering, Zhejiang University, Hangzhou 310058, China
| | - Yan Meng
- Institute of Bioengineering, College of Chemical and Biological Engineering, Zhejiang University, Hangzhou 310058, China
| | - Yixuan Lei
- College of Pharmaceutical Sciences, Zhejiang University, Hangzhou 310058, China
| | - Tianxin Liang
- Institute of Bioengineering, College of Chemical and Biological Engineering, Zhejiang University, Hangzhou 310058, China
| | - Yuhuan Chen
- College of Pharmaceutical Sciences, Zhejiang University, Hangzhou 310058, China
| | - Xiaoshu Zhou
- Transfar Chemicals Group Co., Ltd, Hangzhou 311215, China
| | - Gang Xu
- Institute of Bioengineering, College of Chemical and Biological Engineering, Zhejiang University, Hangzhou 310058, China
| | - Lirong Yang
- Institute of Bioengineering, College of Chemical and Biological Engineering, Zhejiang University, Hangzhou 310058, China; ZJU-Hangzhou Global Scientific and Technological Innovation Centre, Zhejiang University, Hangzhou 311215, China
| | - Wenlong Zheng
- Institute of Bioengineering, College of Chemical and Biological Engineering, Zhejiang University, Hangzhou 310058, China; ZJU-Hangzhou Global Scientific and Technological Innovation Centre, Zhejiang University, Hangzhou 311215, China.
| | - Jianping Wu
- Institute of Bioengineering, College of Chemical and Biological Engineering, Zhejiang University, Hangzhou 310058, China; ZJU-Hangzhou Global Scientific and Technological Innovation Centre, Zhejiang University, Hangzhou 311215, China.
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2
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Song R, Zhang J, Zhu M, Lin L, Wei W, Wei D. Computer-aided rational design strategy based on protein surface charge to improve the thermal stability of a novel esterase from Geobacillus jurassicus. Biotechnol Lett 2024; 46:443-458. [PMID: 38523202 DOI: 10.1007/s10529-024-03473-4] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/08/2023] [Revised: 01/11/2024] [Accepted: 02/10/2024] [Indexed: 03/26/2024]
Abstract
OBJECTIVES Although Geobacillus are significant thermophilic bacteria source, there are no reports of thermostable esterase gene in Geobacillus jurassicus or rational design strategies to increase the thermal stability of esterases. RESULTS Gene gju768 showed a highest similarity of 15.20% to esterases from Geobacillus sp. with detail enzymatic properties. Using a combination of Gibbs Unfolding Free Energy (∆∆G) calculator and the distance from the mutation site to the catalytic site (DsCα-Cα) to screen suitable mutation sites with elimination of negative surface charge, the mutants (D24N, E221Q, and E253Q) displayed stable mutants with higher thermal stability than the wild-type (WT). Mutant E253Q exhibited the best thermal stability, with a half-life (T1/2) at 65 °C of 32.4 min, which was 1.8-fold of the WT (17.9 min). CONCLUSION Cloning of gene gju768 and rational design based on surface charge engineering contributed to the identification of thermostable esterase from Geobacillus sp. and the exploration of evolutionary strategies for thermal stability.
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Affiliation(s)
- Runfei Song
- State Key Laboratory of Bioreactor Engineering, Newworld Institute of Biotechnology, East China University of Science and Technology, 130 Meilong Road, 200237, Shanghai, People's Republic of China
| | - Jin Zhang
- State Key Laboratory of Bioreactor Engineering, Newworld Institute of Biotechnology, East China University of Science and Technology, 130 Meilong Road, 200237, Shanghai, People's Republic of China
| | - Mengyu Zhu
- State Key Laboratory of Bioreactor Engineering, Newworld Institute of Biotechnology, East China University of Science and Technology, 130 Meilong Road, 200237, Shanghai, People's Republic of China
| | - Lin Lin
- School of Chemical and Environmental Engineering, Shanghai Institute of Technology, Shanghai, 201418, People's Republic of China
- Research Laboratory for Functional Nanomaterial, National Engineering Research Center for Nanotechnology, Shanghai, 200241, People's Republic of China
| | - Wei Wei
- State Key Laboratory of Bioreactor Engineering, Newworld Institute of Biotechnology, East China University of Science and Technology, 130 Meilong Road, 200237, Shanghai, People's Republic of China.
| | - Dongzhi Wei
- State Key Laboratory of Bioreactor Engineering, Newworld Institute of Biotechnology, East China University of Science and Technology, 130 Meilong Road, 200237, Shanghai, People's Republic of China
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3
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Du Z, Huang X, Li H, Zheng M, Hong T, Li Z, Du X, Jiang Z, Ni H, Li Q, Zhu Y. Improvement of thermostability by increasing rigidity in the finger regions and flexibility in the catalytic pocket area of Pseudoalteromonas porphyrae κ-carrageenase. World J Microbiol Biotechnol 2024; 40:216. [PMID: 38802708 DOI: 10.1007/s11274-024-04029-4] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/23/2024] [Accepted: 05/20/2024] [Indexed: 05/29/2024]
Abstract
Poor thermostability reduces the industrial application value of κ-carrageenase. In this study, the PoPMuSiC algorithm combined with site-directed mutagenesis was applied to improve the thermostability of the alkaline κ-carrageenase from Pseudoalteromonas porphyrae. The mutant E154A with improved thermal stability was successfully obtained using this strategy after screening seven rationally designed mutants. Compared with the wild-type κ-carrageenase (WT), E154A improved the activity by 29.4% and the residual activity by 51.6% after treatment at 50 °C for 30 min. The melting temperature (Tm) values determined by circular dichroism were 66.4 °C and 64.6 °C for E154A and WT, respectively. Molecular dynamics simulation analysis of κ-carrageenase showed that the flexibility decreased within the finger regions (including F1, F2, F3, F5 and F6) and the flexibility improved in the catalytic pocket area of the mutant E154A. The catalytic tunnel dynamic simulation analysis revealed that E154A led to enlarged catalytic tunnel volume and increased rigidity of the enzyme-substrate complex. The increasing rigidity within the finger regions and more flexible catalytic pocket of P. porphyrae κ-carrageenase might be a significant factor for improvement of the thermostability of the mutant κ-carrageenase E154A. The proposed rational design strategy could be applied to improve the enzyme kinetic stability of other industrial enzymes. Moreover, the hydrolysates of κ-carrageenan digested by the mutant E154A demonstrated increased scavenging activities against hydroxyl (OH) radicals and 2,2'-azinobis(3-ethylbenzothiazoline)-6-sulfonic acid (ABTS) radicals compared with the undigested κ-carrageenan.
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Affiliation(s)
- Zeping Du
- College of Ocean Food and Biological Engineering, Jimei University, Xiamen, 361021, China
| | - Xiaoyi Huang
- College of Ocean Food and Biological Engineering, Jimei University, Xiamen, 361021, China
| | - Hebin Li
- Department of Pharmacy, Xiamen Medical College, Xiamen, 361008, China
| | - Mingjing Zheng
- College of Ocean Food and Biological Engineering, Jimei University, Xiamen, 361021, China
| | - Tao Hong
- College of Ocean Food and Biological Engineering, Jimei University, Xiamen, 361021, China
| | - Zhipeng Li
- College of Ocean Food and Biological Engineering, Jimei University, Xiamen, 361021, China
| | - Xiping Du
- College of Ocean Food and Biological Engineering, Jimei University, Xiamen, 361021, China
| | - Zedong Jiang
- College of Ocean Food and Biological Engineering, Jimei University, Xiamen, 361021, China
| | - Hui Ni
- College of Ocean Food and Biological Engineering, Jimei University, Xiamen, 361021, China
| | - Qingbiao Li
- College of Ocean Food and Biological Engineering, Jimei University, Xiamen, 361021, China
| | - Yanbing Zhu
- College of Ocean Food and Biological Engineering, Jimei University, Xiamen, 361021, China.
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Pan L, Zhang Y, Zhang F, Wang Z, Zheng J. α-L-rhamnosidase: production, properties, and applications. World J Microbiol Biotechnol 2023; 39:191. [PMID: 37160824 DOI: 10.1007/s11274-023-03638-9] [Citation(s) in RCA: 4] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/23/2023] [Accepted: 04/30/2023] [Indexed: 05/11/2023]
Abstract
α-L-rhamnosidase [EC 3.2.1.40] belongs to glycoside hydrolase (GH) families (GH13, GH78, and GH106 families) in the carbohydrate-active enzymes (CAZy) database, which specifically hydrolyzes the non-reducing end of α-L-rhamnose. Αccording to the sites of catalytic hydrolysis, α-L-rhamnosidase can be divided into α-1, 2-rhamnosidase, α-1, 3-rhamnosidase, α-1, 4-rhamnosidase and α-1, 6-rhamnosidase. α-L-rhamnosidase is an important enzyme for various biotechnological applications, especially in food, beverage, and pharmaceutical industries. α-L-rhamnosidase has a wide range of sources and is commonly found in animals, plants, and microorganisms, and its microbial source includes a variety of bacteria, molds and yeasts (such as Lactobacillus sp., Aspergillus sp., Pichia angusta and Saccharomyces cerevisiae). In recent years, a series of advances have been achieved in various aspects of α-validates the above-described-rhamnosidase research. A number of α-L-rhamnosidases have been successfully recombinant expressed in prokaryotic systems as well as eukaryotic systems which involve Pichia pastoris, Saccharomyces cerevisiae and Aspergillus niger, and the catalytic properties of the recombinant enzymes have been improved by enzyme modification techniques. In this review, the sources and production methods, general and catalytic properties and biotechnological applications of α-L-rhamnosidase in different fields are summarized and discussed, concluding with the directions for further in-depth research on α-L-rhamnosidase.
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Affiliation(s)
- Lixia Pan
- Key Laboratory of Bioorganic Synthesis of Zhejiang Province, College of Biotechnology and Bioengineering, Zhejiang University of Technology, Hangzhou, 310014, Zhejiang, People's Republic of China
| | - Yueting Zhang
- Key Laboratory of Bioorganic Synthesis of Zhejiang Province, College of Biotechnology and Bioengineering, Zhejiang University of Technology, Hangzhou, 310014, Zhejiang, People's Republic of China
| | - Fei Zhang
- Key Laboratory of Bioorganic Synthesis of Zhejiang Province, College of Biotechnology and Bioengineering, Zhejiang University of Technology, Hangzhou, 310014, Zhejiang, People's Republic of China
| | - Zhao Wang
- Key Laboratory of Bioorganic Synthesis of Zhejiang Province, College of Biotechnology and Bioengineering, Zhejiang University of Technology, Hangzhou, 310014, Zhejiang, People's Republic of China
| | - Jianyong Zheng
- Key Laboratory of Bioorganic Synthesis of Zhejiang Province, College of Biotechnology and Bioengineering, Zhejiang University of Technology, Hangzhou, 310014, Zhejiang, People's Republic of China.
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5
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Yao Y, Zheng S, Chi S, Chen F, Cai N, Cai Z, Li Z, Ni H. Characterization of the off-flavor from Pichia pastoris GS115 during the overexpression of an α-l-rhamnosidase. J Ind Microbiol Biotechnol 2023; 50:kuad035. [PMID: 37942557 PMCID: PMC10696632 DOI: 10.1093/jimb/kuad035] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/29/2023] [Accepted: 11/04/2023] [Indexed: 11/10/2023]
Abstract
The off-flavor of Pichia pastoris strains is a negative characteristic of proteins overexpressed with this yeast. In the present study, P. pastoris GS115 overexpressing an α-l-rhamnosidase was taken as the example to characterize the off-flavor via sensory evaluation, gas chromatography-mass spectrometer, gas chromatography-olfaction, and omission test. The result showed that the off-flavor was due to the strong sweaty note, and moderate metallic and plastic notes. Four volatile compounds, that is, tetramethylpyrazine, 2,4-di-tert-butylphenol, isovaleric acid, and 2-methylbutyric acid, were identified to be major contributors to the sweaty note. Dodecanol and 2-acetylbutyrolactone were identified to be contributors to the metallic and plastic notes, respectively. It is the first study on the off-flavor of P. pastoris strains, helping understand metabolites with off-flavor of this yeast. Interestingly, it is the first study illustrating 2-acetylbutyrolactone and dodecanol with plastic and metallic notes, providing new information about the aromatic contributors of biological products. IMPORTANCE The methylotrophic yeast Pichia pastoris is an important host for the industrial expression of functional proteins. In our previous studies, P. pastoris strains have been sniffed with a strong off-flavor during the overexpression of various functional proteins, limiting the application of these proteins. Although many yeast strains have been reported with off-flavor, no attention has been paid to characterize the off-flavor in P. pastoris so far. Considering that P. pastoris has advantages over other established expression systems of functional proteins, it is of interest to identify the compounds with off-flavor synthesized in the overexpression of functional proteins with P. pastoris strains. In this study, the off-flavor synthesized from P. pastoris GS115 was characterized during the overexpression of an α-l-rhamnosidase, which helps understand the aromatic metabolites with off-flavor of P. pastoris strains. In addition, 2-acetylbutyrolactone and dodecanol were newly revealed with plastic and metallic notes, enriching the aromatic contributors of biological products. Thus, this study is important for understanding the metabolites with off-flavor of P. pastoris strains and other organisms, providing important knowledge to improve the flavor of products yielding with P. pastoris strains and other organisms. ONE-SENTENCE SUMMARY Characterize the sensory and chemical profile of the off-flavor produced by one strain of P. pastoris in vitro.
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Affiliation(s)
- YuXuan Yao
- College of Ocean Food and Biological Engineering, Jimei University, Xiamen 361021, People's Republic of China
| | - ShengLan Zheng
- College of Ocean Food and Biological Engineering, Jimei University, Xiamen 361021, People's Republic of China
| | - ShiLin Chi
- College of Ocean Food and Biological Engineering, Jimei University, Xiamen 361021, People's Republic of China
| | - Feng Chen
- Department of Food, Nutrition and Packaging Sciences, Clemson University, Clemson, SC 29634, USA
| | - Ning Cai
- Xiamen Ocean Vocational College, Xiamen, Fujian 361021, People's Republic of China
| | - ZhenZhen Cai
- Xiamen Ocean Vocational College, Xiamen, Fujian 361021, People's Republic of China
| | - Zhipeng Li
- College of Ocean Food and Biological Engineering, Jimei University, Xiamen 361021, People's Republic of China
- Key Laboratory of Food Microbiology and Enzyme Engineering Technology of Fujian Province, Xiamen, Fujian 361021, People's Republic of China
- Research Center of Food Biotechnology of Xiamen City, Xiamen, Fujian 361021, People's Republic of China
| | - Hui Ni
- College of Ocean Food and Biological Engineering, Jimei University, Xiamen 361021, People's Republic of China
- Xiamen Ocean Vocational College, Xiamen, Fujian 361021, People's Republic of China
- Key Laboratory of Food Microbiology and Enzyme Engineering Technology of Fujian Province, Xiamen, Fujian 361021, People's Republic of China
- Research Center of Food Biotechnology of Xiamen City, Xiamen, Fujian 361021, People's Republic of China
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6
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Wang D, Zheng P, Chen P, Dan Wu. Engineering an α-L-rhamnosidase from Aspergillus niger for efficient conversion of rutin substrate. Biochem Eng J 2022. [DOI: 10.1016/j.bej.2022.108572] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/24/2022]
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7
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Wang J, Wu J, Li Z, Chen X, Liu W, Yao J. Protein engineering of CMP kinases to improve thermal stability and resultant production of 3′-sialyllactose. BIOTECHNOL BIOTEC EQ 2022. [DOI: 10.1080/13102818.2022.2095302] [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] Open
Affiliation(s)
- Jingjing Wang
- School of Engineering, Anhui Agricultural University, Hefei, Anhui, PR China
| | - Jinyong Wu
- Institute of Plasma Physics, Hefei Institutes of Physical Science, Chinese Academy of Sciences, Hefei, Anhui, PR China
- Department of Bioenergy and Bioengineering, Huainan New Energy Research Center, Institute of Plasma Physics, Chinese Academy of Sciences, Huainan, Anhui, PR China
| | - Zhongkui Li
- Institute of Plasma Physics, Hefei Institutes of Physical Science, Chinese Academy of Sciences, Hefei, Anhui, PR China
- Department of Bioenergy and Bioengineering, Huainan New Energy Research Center, Institute of Plasma Physics, Chinese Academy of Sciences, Huainan, Anhui, PR China
| | - Xiangsong Chen
- Institute of Plasma Physics, Hefei Institutes of Physical Science, Chinese Academy of Sciences, Hefei, Anhui, PR China
- Department of Bioenergy and Bioengineering, Huainan New Energy Research Center, Institute of Plasma Physics, Chinese Academy of Sciences, Huainan, Anhui, PR China
| | - Weiwei Liu
- School of Engineering, Anhui Agricultural University, Hefei, Anhui, PR China
| | - Jianming Yao
- Institute of Plasma Physics, Hefei Institutes of Physical Science, Chinese Academy of Sciences, Hefei, Anhui, PR China
- Department of Bioenergy and Bioengineering, Huainan New Energy Research Center, Institute of Plasma Physics, Chinese Academy of Sciences, Huainan, Anhui, PR China
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8
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Huang JJ, Hu HX, Lu YJ, Bao YD, Zhou JL, Huang M. Computer-Aided Design of α-L-Rhamnosidase to Increase the Synthesis Efficiency of Icariside I. Front Bioeng Biotechnol 2022; 10:926829. [PMID: 35800333 PMCID: PMC9253678 DOI: 10.3389/fbioe.2022.926829] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/23/2022] [Accepted: 05/24/2022] [Indexed: 11/13/2022] Open
Abstract
Icariside I, the glycosylation product of icaritin, is a novel effective anti-cancer agent with immunological anti-tumor activity. However, very limited natural icariside I content hinders its direct extraction from plants. Therefore, we employed a computer-aided protein design strategy to improve the catalytic efficiency and substrate specificity of the α-L-rhamnosidase from Thermotoga petrophila DSM 13995, to provide a highly-efficient preparation method. Several beneficial mutants were obtained by expanding the active cavity. The catalytic efficiencies of all mutants were improved 16-200-fold compared with the wild-type TpeRha. The double-point mutant DH was the best mutant and showed the highest catalytic efficiency (k cat /K M : 193.52 s-1 M-1) against icariin, which was a 209.76-fold increase compared with the wild-type TpeRha. Besides, the single-point mutant H570A showed higher substrate specificity than that of the wild-type TpeRha in hydrolysis of different substrates. This study provides enzyme design strategies and principles for the hydrolysis of rhamnosyl natural products.
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Affiliation(s)
- Jia-Jun Huang
- School of Food Science and Engineering, South China University of Technology, Guangzhou, China
- Golden Health Biotechnology Co., Ltd., Foshan, China
| | - Hao-Xuan Hu
- Golden Health Biotechnology Co., Ltd., Foshan, China
| | - Yu-Jing Lu
- Golden Health Biotechnology Co., Ltd., Foshan, China
- School of Chemical Engineering and Light Industry, School of Biomedical and Pharmaceutical Sciences, Guangdong University of Technology, Guangzhou, China
| | - Ya-Dan Bao
- Golden Health Biotechnology Co., Ltd., Foshan, China
| | - Jin-Lin Zhou
- Golden Health Biotechnology Co., Ltd., Foshan, China
| | - Mingtao Huang
- School of Food Science and Engineering, South China University of Technology, Guangzhou, China
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9
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Sun J, Li W, Liao H, Li L, Ni H, Chen F, Li Q. Adding sorbitol improves the thermostability of α-l-rhamnosidase from Aspergillus niger and increases the conversion of hesperidin. J Food Biochem 2021; 46:e14055. [PMID: 34967461 DOI: 10.1111/jfbc.14055] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/11/2021] [Revised: 12/09/2021] [Accepted: 12/13/2021] [Indexed: 12/11/2022]
Abstract
In this study, we found the addition of sorbitol could improve the thermostability of α-l-rhamnosidase from Aspergillus niger. When α-l-rhamnosidase with sorbitol was heat-treated at 60°C, 65°C, and 70°C, the half-life t1/2 increased by 28-, 18-, and 9-fold, respectively. Inactivation thermodynamic analysis showed that both Ea and ΔG≠ of α-l-rhamnosidase increased. Through the response surface methodology (RSM) analysis, the higher hesperidin conversion (63.26%) by α-l-rhamnosidase was attained with 0.7 M sorbitol at 60°C and pH 4.5 for 10 min. Furthermore, hesperidin could be completely hydrolyzed after 10 hr of reaction. Overall, the results indicated that the addition of sorbitol improved the thermostability of α-l-rhamnosidase and increased the enzymatic conversion of hesperidin to hesperetin-7-O-glucoside (HMG). It also provided a simple and efficient way to increase enzymatic conversion of other valuable flavonoid monomers due to the broad substrate specificities of α-l-rhamnosidase from A. niger. PRACTICAL APPLICATIONS: Hesperetin-7-O-glucoside (HMG), a derhamnosylation product of hesperidin, is considered as a synthetic precursor for novel and efficient sweeteners and is important in food, functional food, and nutraceutical industries. Compared to chemical hydrolysis methods, the enzymatic conversion of hesperidin is milder and has the advantages of high specificity. Adding sorbitol can improve the thermostability of α-l-rhamnosidase and increase the enzyme efficacy against hesperidin. This study gave more evidence that adding sorbitol could improve the thermostability of enzymes and provide a better choice for improving biotransformation potency of enzymes.
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Affiliation(s)
- Jiang Sun
- College of Food and Biology Engineering, Jimei University, Xiamen, China
| | - Wenjing Li
- College of Food and Biology Engineering, Jimei University, Xiamen, China
| | - Hui Liao
- College of Food and Biology Engineering, Jimei University, Xiamen, China
| | - Lijun Li
- College of Food and Biology Engineering, Jimei University, Xiamen, China.,Fujian Provincial Key Laboratory of Food Microbiology and Enzyme Engineering, Xiamen, China.,Research Center of Food Biotechnology of Xiamen City, Xiamen, China
| | - Hui Ni
- College of Food and Biology Engineering, Jimei University, Xiamen, China.,Fujian Provincial Key Laboratory of Food Microbiology and Enzyme Engineering, Xiamen, China.,Research Center of Food Biotechnology of Xiamen City, Xiamen, China
| | - Feng Chen
- College of Food and Biology Engineering, Jimei University, Xiamen, China.,Department of Food, Nutrition and Packaging Sciences, Clemson University, Clemson, SC, USA
| | - Qingbiao Li
- College of Food and Biology Engineering, Jimei University, Xiamen, China.,Fujian Provincial Key Laboratory of Food Microbiology and Enzyme Engineering, Xiamen, China.,Research Center of Food Biotechnology of Xiamen City, Xiamen, China
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10
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Zhan J, Shou C, Zheng Y, Chen Q, Pan J, Li C, Xu J. Discovery and Engineering of Bacterial (−)‐Isopiperitenol Dehydrogenases to Enhance (−)‐Menthol Precursor Biosynthesis. Adv Synth Catal 2021. [DOI: 10.1002/adsc.202100368] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
Affiliation(s)
- Jing‐Ru Zhan
- Laboratory of Biocatalysis and Synthetic Biotechnology State Key Laboratory of Bioreactor Engineering East China University of Science and Technology 130 Meilong Road Shanghai 200237 People's Republic of China
| | - Chao Shou
- Laboratory of Biocatalysis and Synthetic Biotechnology State Key Laboratory of Bioreactor Engineering East China University of Science and Technology 130 Meilong Road Shanghai 200237 People's Republic of China
| | - Yu‐Cong Zheng
- Laboratory of Biocatalysis and Synthetic Biotechnology State Key Laboratory of Bioreactor Engineering East China University of Science and Technology 130 Meilong Road Shanghai 200237 People's Republic of China
| | - Qi Chen
- Laboratory of Biocatalysis and Synthetic Biotechnology State Key Laboratory of Bioreactor Engineering East China University of Science and Technology 130 Meilong Road Shanghai 200237 People's Republic of China
- Shanghai Collaborative Innovation Center for Biomanufacturing School of Biotechnology East China University of Science and Technology 130 Meilong Road Shanghai 200237 People's Republic of China
| | - Jiang Pan
- Laboratory of Biocatalysis and Synthetic Biotechnology State Key Laboratory of Bioreactor Engineering East China University of Science and Technology 130 Meilong Road Shanghai 200237 People's Republic of China
- Shanghai Collaborative Innovation Center for Biomanufacturing School of Biotechnology East China University of Science and Technology 130 Meilong Road Shanghai 200237 People's Republic of China
| | - Chun‐Xiu Li
- Laboratory of Biocatalysis and Synthetic Biotechnology State Key Laboratory of Bioreactor Engineering East China University of Science and Technology 130 Meilong Road Shanghai 200237 People's Republic of China
- Shanghai Collaborative Innovation Center for Biomanufacturing School of Biotechnology East China University of Science and Technology 130 Meilong Road Shanghai 200237 People's Republic of China
| | - Jian‐He Xu
- Laboratory of Biocatalysis and Synthetic Biotechnology State Key Laboratory of Bioreactor Engineering East China University of Science and Technology 130 Meilong Road Shanghai 200237 People's Republic of China
- Shanghai Collaborative Innovation Center for Biomanufacturing School of Biotechnology East China University of Science and Technology 130 Meilong Road Shanghai 200237 People's Republic of China
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11
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Exploiting the activity-stability trade-off of glucose oxidase from Aspergillus niger using a simple approach to calculate thermostability of mutants. Food Chem 2020; 342:128270. [PMID: 33069526 DOI: 10.1016/j.foodchem.2020.128270] [Citation(s) in RCA: 15] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/17/2019] [Revised: 09/16/2020] [Accepted: 09/28/2020] [Indexed: 12/31/2022]
Abstract
Glucose oxidase (Gox) is a biocatalyst that is widely applied in the food industry, as well as other biotechnological industries. However, the industrial application of Gox is hampered by its low thermostability and activity. Here, we aimed to improve the thermostability of GoxM4 from Aspergillus niger without reducing its activity due to the activity-stability trade-off. A simple and effective approach combining enzyme activity and structure stability was adopted to evaluate the thermostability of GoxM4 and its mutants. After four rounds of computer-aided rational design, the best mutant, GoxM8, was obtained. The melting temperature (Tm) of GoxM8 was increased by 9 °C compared with GoxM4. The catalytic efficiency of GoxM8 was similar to GoxM4, suggesting that the enzyme activity-stability trade-off was counteracted. To explore its mechanism, we performed molecular dynamics simulations of GoxM4 and its mutants. Our findings provided a typical example for researching the enzyme activity-stability trade-off.
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12
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Enhancement in affinity of Aspergillus niger JMU-TS528 α-L-rhamnosidase (r-Rha1) by semiconservative site-directed mutagenesis of (α/α)6 catalytic domain. Int J Biol Macromol 2020; 151:845-854. [DOI: 10.1016/j.ijbiomac.2020.02.157] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/07/2019] [Revised: 02/03/2020] [Accepted: 02/14/2020] [Indexed: 12/20/2022]
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