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Huang Z, Ni D, Chen Z, Zhu Y, Zhang W, Mu W. Application of molecular dynamics simulation in the field of food enzymes: improving the thermal-stability and catalytic ability. Crit Rev Food Sci Nutr 2023:1-13. [PMID: 37485919 DOI: 10.1080/10408398.2023.2238054] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 07/25/2023]
Abstract
Enzymes can produce high-quality food with low pollution, high function, high acceptability, and medical aid. However, most enzymes, in their native form, do not meet the industrial requirements. Sequence-based and structure-based methods are the two main strategies used for enzyme modification. Molecular Dynamics (MD) simulation is a sufficiently comprehensive technology, from a molecular perspective, which has been widely used for structure information analysis and enzyme modification. In this review, we summarize the progress and development of MD simulation, particularly for software, force fields, and a standard procedure. Subsequently, we review the application of MD simulation in various food enzymes for thermostability and catalytic improvement was reviewed in depth. Finally, the limitations and prospects of MD simulation in food enzyme modification research are discussed. This review highlights the significance of MD simulation and its prospects in food enzyme modification.
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Affiliation(s)
- Zhaolin Huang
- State Key Laboratory of Food Science and Technology, Jiangnan University, Wuxi, Jiangsu, China
| | - Dawei Ni
- State Key Laboratory of Food Science and Technology, Jiangnan University, Wuxi, Jiangsu, China
| | - Ziwei Chen
- State Key Laboratory of Food Science and Technology, Jiangnan University, Wuxi, Jiangsu, China
| | - Yingying Zhu
- State Key Laboratory of Food Science and Technology, Jiangnan University, Wuxi, Jiangsu, China
| | - Wenli Zhang
- State Key Laboratory of Food Science and Technology, Jiangnan University, Wuxi, Jiangsu, China
| | - Wanmeng Mu
- State Key Laboratory of Food Science and Technology, Jiangnan University, Wuxi, Jiangsu, China
- International Joint Laboratory on Food Safety, Jiangnan University, Wuxi, Jiangsu, China
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Wang X, Ma Q, Shen J, Wang B, Gao X, Zhao L. Application Fields, Positions, and Bioinformatic Mining of Non-active Sites: A Mini-Review. Front Chem 2021; 9:661008. [PMID: 34136463 PMCID: PMC8201498 DOI: 10.3389/fchem.2021.661008] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/30/2021] [Accepted: 05/21/2021] [Indexed: 11/22/2022] Open
Abstract
Active sites of enzymes play a vital role in catalysis, and researchhas been focused on the interactions between active sites and substrates to understand the biocatalytic process. However, the active sites distal to the catalytic cavity also participate in catalysis by maintaining the catalytic conformations. Therefore, some researchers have begun to investigate the roles of non-active sites in proteins, especially for enzyme families with different functions. In this mini-review, we focused on recent progress in research on non-active sites of enzymes. First, we outlined two major research methodswith non-active sites as direct targets, including understanding enzymatic mechanisms and enzyme engineering. Second, we classified the positions of reported non-active sites in enzyme structures and studied the molecular mechanisms underlying their functions, according to the literature on non-active sites. Finally, we summarized the results of bioinformatic analysisof mining non-active sites as targets for protein engineering.
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Affiliation(s)
- Xiaoxiao Wang
- School of Life Science, Shandong University of Technology, Zibo, China
| | - Qinyuan Ma
- School of Life Science, Shandong University of Technology, Zibo, China
| | - Jian Shen
- Shandong Jincheng Pharmaceutical Group Co.LTD, Zibo, China
| | - Bin Wang
- Shandong Jincheng Pharmaceutical Group Co.LTD, Zibo, China
| | - Xiuzhen Gao
- School of Life Science, Shandong University of Technology, Zibo, China
| | - Liming Zhao
- School of Life Science, Shandong University of Technology, Zibo, China.,Shandong Jincheng Pharmaceutical Group Co.LTD, Zibo, China.,State Key Laboratory of Bioreactor Engineering, East China University of Science and Technology, Shanghai, China
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Singh R, Singh T, Hassan M, Kennedy JF. Updates on inulinases: Structural aspects and biotechnological applications. Int J Biol Macromol 2020; 164:193-210. [DOI: 10.1016/j.ijbiomac.2020.07.078] [Citation(s) in RCA: 17] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/22/2020] [Revised: 06/30/2020] [Accepted: 07/08/2020] [Indexed: 12/16/2022]
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Purification, thermodynamics and kinetic characterization of fungal endoinulinase for the production of fructooligosaccharides from inulin. Int J Biol Macromol 2020; 164:3535-3545. [DOI: 10.1016/j.ijbiomac.2020.09.001] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/16/2020] [Revised: 08/08/2020] [Accepted: 09/01/2020] [Indexed: 11/18/2022]
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Zhang R, He L, Shen J, Miao Y, Tang X, Wu Q, Zhou J, Huang Z. Improving low-temperature activity and thermostability of exo-inulinase InuAGN25 on the basis of increasing rigidity of the terminus and flexibility of the catalytic domain. Bioengineered 2020; 11:1233-1244. [PMID: 33131413 PMCID: PMC8291790 DOI: 10.1080/21655979.2020.1837476] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/28/2022] Open
Abstract
Enzymes displaying high activity at low temperatures and good thermostability are attracting attention in many studies. However, improving low-temperature activity along with the thermostability of enzymes remains challenging. In this study, the mutant Mut8S, including eight sites (N61E, K156R, P236E, T243K, D268E, T277D, Q390K, and R409D) mutated from the exo-inulinase InuAGN25, was designed on the basis of increasing the number of salt bridges through comparison between the low-temperature-active InuAGN25 and thermophilic exo-inulinases. The recombinant Mut8S, which was expressed in Escherichia coli, was digested by human rhinovirus 3 C protease to remove the amino acid fusion sequence at N-terminus, producing RfsMut8S. Compared with wild-type RfsMInuAGN25, the mutant RfsMut8S showed (1) lower root mean square deviation values, (2) lower root mean square fluctuation (RMSF) values of residues in six regions of the N and C termini but higher RMSF values in five regions of the catalytic pocket, (3) higher activity at 0-40°C, and (4) better thermostability at 50°C. This study proposes a way to increase low-temperature activity along with a thermostability improvement of exo-inulinase on the basis of increasing the rigidity of the terminus and the flexibility of the catalytic domain. These findings may prove useful in formulating rational designs for increasing the thermal performance of enzymes.
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Affiliation(s)
- Rui Zhang
- Engineering Research Center of Sustainable Development and Utilization of Biomass Energy, Ministry of Education, Yunnan Normal University , Kunming, People's Republic of China.,College of Life Sciences, Yunnan Normal University , Kunming, People's Republic of China.,Key Laboratory of Yunnan for Biomass Energy and Biotechnology of Environment, Kunming, Yunnan, People's Republic of China
| | - Limei He
- Engineering Research Center of Sustainable Development and Utilization of Biomass Energy, Ministry of Education, Yunnan Normal University , Kunming, People's Republic of China.,College of Life Sciences, Yunnan Normal University , Kunming, People's Republic of China.,Key Laboratory of Yunnan for Biomass Energy and Biotechnology of Environment, Kunming, Yunnan, People's Republic of China
| | - Jidong Shen
- Engineering Research Center of Sustainable Development and Utilization of Biomass Energy, Ministry of Education, Yunnan Normal University , Kunming, People's Republic of China.,College of Life Sciences, Yunnan Normal University , Kunming, People's Republic of China.,Key Laboratory of Yunnan for Biomass Energy and Biotechnology of Environment, Kunming, Yunnan, People's Republic of China
| | - Ying Miao
- Engineering Research Center of Sustainable Development and Utilization of Biomass Energy, Ministry of Education, Yunnan Normal University , Kunming, People's Republic of China.,College of Life Sciences, Yunnan Normal University , Kunming, People's Republic of China.,Key Laboratory of Yunnan for Biomass Energy and Biotechnology of Environment, Kunming, Yunnan, People's Republic of China
| | - Xianghua Tang
- Engineering Research Center of Sustainable Development and Utilization of Biomass Energy, Ministry of Education, Yunnan Normal University , Kunming, People's Republic of China.,College of Life Sciences, Yunnan Normal University , Kunming, People's Republic of China.,Key Laboratory of Yunnan for Biomass Energy and Biotechnology of Environment, Kunming, Yunnan, People's Republic of China
| | - Qian Wu
- Engineering Research Center of Sustainable Development and Utilization of Biomass Energy, Ministry of Education, Yunnan Normal University , Kunming, People's Republic of China.,College of Life Sciences, Yunnan Normal University , Kunming, People's Republic of China.,Key Laboratory of Yunnan for Biomass Energy and Biotechnology of Environment, Kunming, Yunnan, People's Republic of China
| | - Junpei Zhou
- Engineering Research Center of Sustainable Development and Utilization of Biomass Energy, Ministry of Education, Yunnan Normal University , Kunming, People's Republic of China.,College of Life Sciences, Yunnan Normal University , Kunming, People's Republic of China.,Key Laboratory of Yunnan for Biomass Energy and Biotechnology of Environment, Kunming, Yunnan, People's Republic of China
| | - Zunxi Huang
- Engineering Research Center of Sustainable Development and Utilization of Biomass Energy, Ministry of Education, Yunnan Normal University , Kunming, People's Republic of China.,College of Life Sciences, Yunnan Normal University , Kunming, People's Republic of China.,Key Laboratory of Yunnan for Biomass Energy and Biotechnology of Environment, Kunming, Yunnan, People's Republic of China
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Ma J, Li T, Tan H, Liu W, Yin H. The Important Roles Played in Substrate Binding of Aromatic Amino Acids in Exo-Inulinase From Kluyveromyces cicerisporus CBS 4857. Front Mol Biosci 2020; 7:569797. [PMID: 33102520 PMCID: PMC7545266 DOI: 10.3389/fmolb.2020.569797] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/05/2020] [Accepted: 09/03/2020] [Indexed: 11/13/2022] Open
Abstract
Inulinase is a member of the glycoside hydrolase family 32 (GH32). It catalyzes the randomly hydrolyzation of 2,1-β-D-fructosidic linkages in inulin and plays a role in the production of high-fructose syrup. In this study, detailed roles of the conserved residues W79, F113, M117, R181, C239, and W334 of the exo-inulinase from Kluyveromyces cicerisporus CBS4857 (KcINU1) in substrate binding and stabilization were evaluated by in silico analysis and site-directed mutagenesis. These residues belong to the conserved WG, FSGSMV, RDP, ECP, and WQY regions of the GH32 and are located around the catalytic pocket of KcINU1. Zymogram assay showed relatively weaker band for F113W and similar band for M117A compared to the wild-type enzyme toward inulin and sucrose, whereas all other variants showed no observable stain on the native polyacrylamide gel electrophoresis. These results were further confirmed with the dinitrosalicylic acid colorimetric method. It showed that the residual activities of F113W toward inulin and sucrose were 33.8 ± 3.3% and 96.2 ± 5.5%, respectively, and that of M117A were 103.8 ± 1.3% and 166.5 ± 12%, respectively. Results from fluorescence spectra indicated that there is a significant conformational change that happened in F113W compared to the wild-type enzyme, while M117A exhibited limited impact although the quenching effect was increased.
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Affiliation(s)
- Junyan Ma
- Natural Products and Glyco-Biotechnology Research Group, Liaoning Provincial Key Laboratory of Carbohydrates, Dalian Institute of Chemical Physics, Chinese Academy of Sciences, Dalian, China.,Medical College, Dalian University, Dalian, China
| | - Tang Li
- Natural Products and Glyco-Biotechnology Research Group, Liaoning Provincial Key Laboratory of Carbohydrates, Dalian Institute of Chemical Physics, Chinese Academy of Sciences, Dalian, China
| | - Haidong Tan
- Natural Products and Glyco-Biotechnology Research Group, Liaoning Provincial Key Laboratory of Carbohydrates, Dalian Institute of Chemical Physics, Chinese Academy of Sciences, Dalian, China
| | - Wujun Liu
- Natural Products and Glyco-Biotechnology Research Group, Liaoning Provincial Key Laboratory of Carbohydrates, Dalian Institute of Chemical Physics, Chinese Academy of Sciences, Dalian, China.,Institute of Cancer Stem Cell, Dalian Medical University, Dalian, China
| | - Heng Yin
- Natural Products and Glyco-Biotechnology Research Group, Liaoning Provincial Key Laboratory of Carbohydrates, Dalian Institute of Chemical Physics, Chinese Academy of Sciences, Dalian, China
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He L, Zhang R, Shen J, Miao Y, Tang X, Wu Q, Zhou J, Huang Z. Removal of N-terminal tail changes the thermostability of the low-temperature-active exo-inulinase InuAGN25. Bioengineered 2020; 11:921-931. [PMID: 32865156 PMCID: PMC8291819 DOI: 10.1080/21655979.2020.1809921] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/12/2022] Open
Abstract
Exo-inulinases are members of the glycoside hydrolase family 32 and function by hydrolyzing inulin into fructose with yields up to 90–95%. The N-terminal tail contributes to enzyme thermotolerance, which plays an important role in enzyme applications. However, the role of N-terminal amino acid residues in the thermal performance and structural properties of exo-inulinases remains to be elucidated. In this study, three and six residues of the N-terminus starting from Gln23 of the exo-inulinase InuAGN25 were deleted and expressed in Escherichia coli. After digestion with human rhinovirus 3 C protease to remove the N-terminal amino acid fusion sequence that may affect the thermolability of enzymes, wild-type RfsMInuAGN25 and its mutants RfsMutNGln23Δ3 and RfsMutNGln23Δ6 were produced. Compared with RfsMInuAGN25, thermostability of RfsMutNGln23Δ3 was enhanced while that of RfsMutNGln23Δ6 was slightly reduced. Compared with the N-terminal structures of RfsMInuAGN25 and RfsMutNGln23Δ6, RfsMutNGln23Δ3 had a higher content of (1) the helix structure, (2) salt bridges (three of which were organized in a network), (3) cation–π interactions (one of which anchored the N-terminal tail). These structural properties may account for the improved thermostability of RfsMutNGln23Δ3. The study provides a better understanding of the N-terminus–function relationships that are useful for rational design of thermostability of exo-inulinases.
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Affiliation(s)
- Limei He
- Engineering Research Center of Sustainable Development and Utilization of Biomass Energy, Ministry of Education, Yunnan Normal University , Kunming, People's Republic of China.,College of Life Sciences, Yunnan Normal University , Kunming, People's Republic of China.,Key Laboratory of Yunnan for Biomass Energy and Biotechnology of Environment , Yunnan, Kunming, People's Republic of China
| | - Rui Zhang
- Engineering Research Center of Sustainable Development and Utilization of Biomass Energy, Ministry of Education, Yunnan Normal University , Kunming, People's Republic of China.,College of Life Sciences, Yunnan Normal University , Kunming, People's Republic of China.,Key Laboratory of Yunnan for Biomass Energy and Biotechnology of Environment , Yunnan, Kunming, People's Republic of China
| | - Jidong Shen
- Engineering Research Center of Sustainable Development and Utilization of Biomass Energy, Ministry of Education, Yunnan Normal University , Kunming, People's Republic of China.,College of Life Sciences, Yunnan Normal University , Kunming, People's Republic of China.,Key Laboratory of Yunnan for Biomass Energy and Biotechnology of Environment , Yunnan, Kunming, People's Republic of China
| | - Ying Miao
- Engineering Research Center of Sustainable Development and Utilization of Biomass Energy, Ministry of Education, Yunnan Normal University , Kunming, People's Republic of China.,College of Life Sciences, Yunnan Normal University , Kunming, People's Republic of China.,Key Laboratory of Yunnan for Biomass Energy and Biotechnology of Environment , Yunnan, Kunming, People's Republic of China
| | - Xianghua Tang
- Engineering Research Center of Sustainable Development and Utilization of Biomass Energy, Ministry of Education, Yunnan Normal University , Kunming, People's Republic of China.,College of Life Sciences, Yunnan Normal University , Kunming, People's Republic of China.,Key Laboratory of Yunnan for Biomass Energy and Biotechnology of Environment , Yunnan, Kunming, People's Republic of China
| | - Qian Wu
- Engineering Research Center of Sustainable Development and Utilization of Biomass Energy, Ministry of Education, Yunnan Normal University , Kunming, People's Republic of China.,College of Life Sciences, Yunnan Normal University , Kunming, People's Republic of China.,Key Laboratory of Yunnan for Biomass Energy and Biotechnology of Environment , Yunnan, Kunming, People's Republic of China
| | - Junpei Zhou
- Engineering Research Center of Sustainable Development and Utilization of Biomass Energy, Ministry of Education, Yunnan Normal University , Kunming, People's Republic of China.,College of Life Sciences, Yunnan Normal University , Kunming, People's Republic of China.,Key Laboratory of Yunnan for Biomass Energy and Biotechnology of Environment , Yunnan, Kunming, People's Republic of China
| | - Zunxi Huang
- Engineering Research Center of Sustainable Development and Utilization of Biomass Energy, Ministry of Education, Yunnan Normal University , Kunming, People's Republic of China.,College of Life Sciences, Yunnan Normal University , Kunming, People's Republic of China.,Key Laboratory of Yunnan for Biomass Energy and Biotechnology of Environment , Yunnan, Kunming, People's Republic of China
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In silico design and in vitro analysis of a recombinant trivalent fusion protein candidate vaccine targeting virulence factor of Clostridium perfringens. Int J Biol Macromol 2020; 146:1015-1023. [DOI: 10.1016/j.ijbiomac.2019.09.227] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/01/2019] [Revised: 09/21/2019] [Accepted: 09/23/2019] [Indexed: 11/23/2022]
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9
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Ma J, Li Q, Tan H, Jiang H, Li K, Zhang L, Shi Q, Yin H. Unique N-glycosylation of a recombinant exo-inulinase from Kluyveromyces cicerisporus and its effect on enzymatic activity and thermostability. J Biol Eng 2019; 13:81. [PMID: 31737090 PMCID: PMC6844067 DOI: 10.1186/s13036-019-0215-y] [Citation(s) in RCA: 13] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/12/2019] [Accepted: 10/16/2019] [Indexed: 01/05/2023] Open
Abstract
Background Inulinase can hydrolyze polyfructan into high-fructose syrups and fructoligosaccharides, which are widely used in food, the medical industry and the biorefinery of Jerusalem artichoke. In the present study, a recombinant exo-inulinase (rKcINU1), derived from Kluyveromyces cicerisporus CBS4857, was proven as an N-linked glycoprotein, and the removal of N-linked glycan chains led to reduced activity. Results Five N-glycosylation sites with variable high mannose-type oligosaccharides (Man3–9GlcNAc2) were confirmed in the rKcINU1. The structural modeling showed that all five glycosylation sites (Asn-362, Asn-370, Asn-399, Asn-467 and Asn-526) were located at the C-terminus β-sandwich domain, which has been proven to be more conducive to the occurrence of glycosylation modification than the N-terminus domain. Single-site N-glycosylation mutants with Asn substituted by Gln were obtained, and the Mut with all five N-glycosylation sites removed was constructed, which resulted in the loss of all enzyme activity. Interestingly, the N362Q led to an 18% increase in the specific activity against inulin, while a significant decrease in thermostability (2.91 °C decrease in Tm) occurred, and other single mutations resulted in the decrease in the specific activity to various extents, among which N467Q demonstrated the lowest enzyme activity. Conclusion The increased enzyme activity in N362Q, combined with thermostability testing, 3D modeling, kinetics data and secondary structure analysis, implied that the N-linked glycan chains at the Asn-362 position functioned negatively, mainly as a type of steric hindrance toward its adjacent N-glycans to bring rigidity. Meanwhile, the N-glycosylation at the other four sites positively regulated enzyme activity caused by altered substrate affinity by means of fine-tuning the β-sandwich domain configuration. This may have facilitated the capture and transfer of substrates to the enzyme active cavity, in a manner quite similar to that of carbohydrate binding modules (CBMs), i.e. the chains endowed the β-sandwich domain with the functions of CBM. This study discovered a unique C-terminal sequence which is more favorable to glycosylation, thereby casting a novel view for glycoengineering of enzymes from fungi via redesigning the amino acid sequence at the C-terminal domain, so as to optimize the enzymatic properties.
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Affiliation(s)
- Junyan Ma
- 1Natural Products and Glyco-Biotechnology Research Group, Liaoning Province Key Laboratory of Carbohydrates, Dalian Institute of Chemical Physics, Chinese Academy of Sciences, Dalian, 116023 China.,2Liaoning Province Key Laboratory of Bio-Organic Chemistry, Dalian University, Dalian, 116622 China
| | - Qian Li
- 2Liaoning Province Key Laboratory of Bio-Organic Chemistry, Dalian University, Dalian, 116622 China
| | - Haidong Tan
- 1Natural Products and Glyco-Biotechnology Research Group, Liaoning Province Key Laboratory of Carbohydrates, Dalian Institute of Chemical Physics, Chinese Academy of Sciences, Dalian, 116023 China
| | - Hao Jiang
- 3Dalian Institute of Chemical Physics, Chinese Academy of Sciences, Dalian, 116023 China
| | - Kuikui Li
- 1Natural Products and Glyco-Biotechnology Research Group, Liaoning Province Key Laboratory of Carbohydrates, Dalian Institute of Chemical Physics, Chinese Academy of Sciences, Dalian, 116023 China
| | - Lihua Zhang
- 3Dalian Institute of Chemical Physics, Chinese Academy of Sciences, Dalian, 116023 China
| | - Quan Shi
- 3Dalian Institute of Chemical Physics, Chinese Academy of Sciences, Dalian, 116023 China
| | - Heng Yin
- 1Natural Products and Glyco-Biotechnology Research Group, Liaoning Province Key Laboratory of Carbohydrates, Dalian Institute of Chemical Physics, Chinese Academy of Sciences, Dalian, 116023 China
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Holyavka MG, Kondratyev MS, Lukin AN, Agapov BL, Artyukhov VG. Immobilization of inulinase on KU-2 ion-exchange resin matrix. Int J Biol Macromol 2019; 138:681-692. [DOI: 10.1016/j.ijbiomac.2019.07.132] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/17/2019] [Revised: 07/21/2019] [Accepted: 07/22/2019] [Indexed: 12/01/2022]
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Holyavka MG, Kayumov AR, Baydamshina DR, Koroleva VA, Trizna EY, Trushin MV, Artyukhov VG. Efficient fructose production from plant extracts by immobilized inulinases from Kluyveromyces marxianus and Helianthus tuberosus. Int J Biol Macromol 2018; 115:829-834. [PMID: 29698764 DOI: 10.1016/j.ijbiomac.2018.04.107] [Citation(s) in RCA: 13] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/21/2017] [Revised: 02/14/2018] [Accepted: 04/20/2018] [Indexed: 01/01/2023]
Abstract
The enzymatic hydrolysis of poly- and oligosaccharides from plants seems like an advantageous approach for sugars production. Two inulinases producing fructose from plant oligosaccharides were isolated from yeast Kluyveromyces marxianus and plant Helianthus tuberosus. Both enzymes were immobilized on polymeric carriers by using the static adsorption approach. We could save 80.4% of the initial catalytic activity of plant inulinase immobilized on KU-2 cation-exchange resin and 75.5% of yeast enzyme activity adsorbed on AV-17-2P anion-exchange resin. After immobilization, the Km values increased 1.5 and 6 times for enzymes from K. marxianus and H. tuberosus, respectively. The optimal temperatures for catalysis of both enzymes were increased from 48-50 °C up to 70 °C. The activities of both immobilized enzymes remained unchanged after the 10 cycles of 20-min hydrolysis reaction at 70 °C model batch reactor. Sorbents, native and immobilized enzymes did not exhibit any mutagenic or cytotoxic activity.
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