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Wang X, Hu R, Zhang Y, Tian L, Liu S, Huang Z, Wang L, Lu Y, Wang L, Wang Y, Wu Y, Cong Y, Yang G. Mechanistic analysis of thermal stability in a novel thermophilic polygalacturonase MlPG28B derived from the marine fungus Mucor lusitanicus. Int J Biol Macromol 2024:136007. [PMID: 39326595 DOI: 10.1016/j.ijbiomac.2024.136007] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/21/2024] [Revised: 09/23/2024] [Accepted: 09/23/2024] [Indexed: 09/28/2024]
Abstract
In this study, heterologous MlPG28B expression was obtained by cloning the Mucor lusitanicus gene screened from a marine environment. The enzyme activity of MlPG28B was maximum at 60 °C, 30 % of the enzyme activity was retained after incubation at 100 °C for 30 min, and enzyme activity was still present after 60 min incubation, one of the best thermostable polygalacturonases characterized until now. The high-purity oligosaccharide standards (DP2-DP7) were prepared with polygalacturonic acid as a substrate. Kinetic parameters showed that MlPG28B at the optimum temperature has a low Km value (3055 ± 1104 mg/L), indicating high substrate affinity. Sequence alignment analysis inferred key residues Cys276, Cys284, Lys107, and Gln237 for MlPG28B thermal stability. Molecular docking and molecular dynamics simulation results indicated that MlPG28B has flexible T1 and T3 loops conducive to substrate recognition, binding, and catalysis and forms a hydrogen bond to the substrate by a highly conserved residue Asn161 in the active-site cleft. Based on site-directed mutation results, the five residues are key in determining MlPG28B thermal stability. Therefore, MlPG28B is a promising candidate for industrial enzymes in feed preparation.
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Affiliation(s)
- Xin Wang
- College of Fisheries and Life Science, National Demonstration Center for Experimental Aquaculture Education (Dalian Ocean University), Ministry of Education, Dalian 116023, China; Dalian Key Laboratory of Breeding, Reproduction and Aquaculture of Crustaceans, Dalian 116023, China; Key Laboratory of Environment Controlled Aquaculture, Ministry of Education, Dalian 116023, China
| | - Ruitong Hu
- College of Fisheries and Life Science, National Demonstration Center for Experimental Aquaculture Education (Dalian Ocean University), Ministry of Education, Dalian 116023, China; Dalian Key Laboratory of Breeding, Reproduction and Aquaculture of Crustaceans, Dalian 116023, China; Key Laboratory of Environment Controlled Aquaculture, Ministry of Education, Dalian 116023, China
| | - Yu Zhang
- College of Fisheries and Life Science, National Demonstration Center for Experimental Aquaculture Education (Dalian Ocean University), Ministry of Education, Dalian 116023, China; Dalian Key Laboratory of Breeding, Reproduction and Aquaculture of Crustaceans, Dalian 116023, China; Key Laboratory of Environment Controlled Aquaculture, Ministry of Education, Dalian 116023, China
| | - Linfang Tian
- College of Fisheries and Life Science, National Demonstration Center for Experimental Aquaculture Education (Dalian Ocean University), Ministry of Education, Dalian 116023, China; Dalian Key Laboratory of Breeding, Reproduction and Aquaculture of Crustaceans, Dalian 116023, China; Key Laboratory of Environment Controlled Aquaculture, Ministry of Education, Dalian 116023, China
| | - Siyi Liu
- College of Fisheries and Life Science, National Demonstration Center for Experimental Aquaculture Education (Dalian Ocean University), Ministry of Education, Dalian 116023, China; Dalian Key Laboratory of Breeding, Reproduction and Aquaculture of Crustaceans, Dalian 116023, China; Key Laboratory of Environment Controlled Aquaculture, Ministry of Education, Dalian 116023, China
| | - Zhe Huang
- College of Fisheries and Life Science, National Demonstration Center for Experimental Aquaculture Education (Dalian Ocean University), Ministry of Education, Dalian 116023, China; Dalian Key Laboratory of Breeding, Reproduction and Aquaculture of Crustaceans, Dalian 116023, China; Key Laboratory of Environment Controlled Aquaculture, Ministry of Education, Dalian 116023, China
| | - Lianshun Wang
- College of Fisheries and Life Science, National Demonstration Center for Experimental Aquaculture Education (Dalian Ocean University), Ministry of Education, Dalian 116023, China; Dalian Key Laboratory of Breeding, Reproduction and Aquaculture of Crustaceans, Dalian 116023, China; Key Laboratory of Environment Controlled Aquaculture, Ministry of Education, Dalian 116023, China
| | - Yanan Lu
- College of Fisheries and Life Science, National Demonstration Center for Experimental Aquaculture Education (Dalian Ocean University), Ministry of Education, Dalian 116023, China; Dalian Key Laboratory of Breeding, Reproduction and Aquaculture of Crustaceans, Dalian 116023, China; Key Laboratory of Environment Controlled Aquaculture, Ministry of Education, Dalian 116023, China
| | - Li Wang
- College of Fisheries and Life Science, National Demonstration Center for Experimental Aquaculture Education (Dalian Ocean University), Ministry of Education, Dalian 116023, China; Dalian Key Laboratory of Breeding, Reproduction and Aquaculture of Crustaceans, Dalian 116023, China; Key Laboratory of Environment Controlled Aquaculture, Ministry of Education, Dalian 116023, China
| | - Yuan Wang
- College of Fisheries and Life Science, National Demonstration Center for Experimental Aquaculture Education (Dalian Ocean University), Ministry of Education, Dalian 116023, China; Dalian Key Laboratory of Breeding, Reproduction and Aquaculture of Crustaceans, Dalian 116023, China; Key Laboratory of Environment Controlled Aquaculture, Ministry of Education, Dalian 116023, China
| | - Yuntian Wu
- Agricultural Service Center, Huanren Manchu Autonomous County, Benxi 117200, China.
| | - Yuting Cong
- College of Fisheries and Life Science, National Demonstration Center for Experimental Aquaculture Education (Dalian Ocean University), Ministry of Education, Dalian 116023, China; Dalian Key Laboratory of Breeding, Reproduction and Aquaculture of Crustaceans, Dalian 116023, China; Key Laboratory of Environment Controlled Aquaculture, Ministry of Education, Dalian 116023, China.
| | - Guojun Yang
- College of Fisheries and Life Science, National Demonstration Center for Experimental Aquaculture Education (Dalian Ocean University), Ministry of Education, Dalian 116023, China; Dalian Key Laboratory of Breeding, Reproduction and Aquaculture of Crustaceans, Dalian 116023, China; Key Laboratory of Environment Controlled Aquaculture, Ministry of Education, Dalian 116023, China.
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Carton C, Safran J, Lemaire A, Domon JM, Poelmans W, Beeckman T, Ramos-Martín F, Antonietti V, Sonnet P, Sahraoui ALH, Lefebvre V, Pelloux J, Pau-Roblot C. Structural and biochemical characterization of SmoPG1, an exo-polygalacturonase from Selaginella moellendorffii. Int J Biol Macromol 2024; 269:131918. [PMID: 38697418 DOI: 10.1016/j.ijbiomac.2024.131918] [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: 12/20/2023] [Revised: 03/22/2024] [Accepted: 04/25/2024] [Indexed: 05/05/2024]
Abstract
Polygalacturonases (PGs) can modulate chemistry and mechanical properties of the plant cell wall through the degradation of pectins, one of its major constituents. PGs are largely used in food, beverage, textile, and paper industries to increase processes' performances. To improve the use of PGs, knowledge of their biochemical, structural and functional features is of prime importance. Our study aims at characterizing SmoPG1, a polygalacturonase from Selaginella moellendorffii, that belongs to the lycophytes. Transcription data showed that SmoPG1 was mainly expressed in S. moellendorffii shoots while phylogenetic analyses suggested that SmoPG1 is an exo-PG, which was confirmed by the biochemical characterization following its expression in heterologous system. Indeed, LC-MS/MS oligoprofiling using various pectic substrates identified galacturonic acid (GalA) as the main hydrolysis product. We found that SmoPG1 was most active on polygalacturonic acid (PGA) at pH 5, and that its activity could be modulated by different cations (Ca2+, Cu2+, Fe2+, Mg2+, Mn2+, Na2+, Zn2+). In addition, SmoPG1 was inhibited by green tea catechins, including (-)-epigallocatechin-3-gallate (EGCG). Docking analyses and MD simulations showed in detail amino acids responsible for the SmoPG1-EGCG interaction. Considering its expression yield and activity, SmoPG1 appears as a prime candidate for the industrial production of GalA.
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Affiliation(s)
- Camille Carton
- UMRT INRAE 1158 BioEcoAgro - Biologie des Plantes et Innovation, Université de Picardie Jules Verne, UFR des Sciences, 33 Rue St Leu, 80039 Amiens, France
| | - Josip Safran
- UMRT INRAE 1158 BioEcoAgro - Biologie des Plantes et Innovation, Université de Picardie Jules Verne, UFR des Sciences, 33 Rue St Leu, 80039 Amiens, France
| | - Adrien Lemaire
- UMRT INRAE 1158 BioEcoAgro - Biologie des Plantes et Innovation, Université de Picardie Jules Verne, UFR des Sciences, 33 Rue St Leu, 80039 Amiens, France
| | - Jean-Marc Domon
- UMRT INRAE 1158 BioEcoAgro - Biologie des Plantes et Innovation, Université de Picardie Jules Verne, UFR des Sciences, 33 Rue St Leu, 80039 Amiens, France
| | - Ward Poelmans
- Department of Plant Biotechnology and Bioinformatics, Ghent University, Ghent 9052, Belgium; Center for Plant Systems Biology, VIB-UGent, Ghent 9052, Belgium
| | - Tom Beeckman
- Department of Plant Biotechnology and Bioinformatics, Ghent University, Ghent 9052, Belgium; Center for Plant Systems Biology, VIB-UGent, Ghent 9052, Belgium
| | - Francisco Ramos-Martín
- Unité de Génie Enzymatique et Cellulaire UMR 7025 CNRS, Université de Picardie Jules Verne, F-80039 Amiens, France
| | - Viviane Antonietti
- Agents Infectieux, Resistance Et Chimiothérapie (AGIR), EA4294, Université de Picardie Jules Verne, UFR de Pharmacie, 1, rue des Louvels, 80037 Amiens, France
| | - Pascal Sonnet
- Agents Infectieux, Resistance Et Chimiothérapie (AGIR), EA4294, Université de Picardie Jules Verne, UFR de Pharmacie, 1, rue des Louvels, 80037 Amiens, France
| | - Anissa Lounès-Hadj Sahraoui
- Unité de Chimie Environnementale et Interactions sur le Vivant (UCEIV), Université du Littoral Côte d'Opale, 50, Rue Ferdinand Buisson, 62228 Calais Cedex, France
| | - Valérie Lefebvre
- UMRT INRAE 1158 BioEcoAgro - Biologie des Plantes et Innovation, Université de Picardie Jules Verne, UFR des Sciences, 33 Rue St Leu, 80039 Amiens, France
| | - Jérôme Pelloux
- UMRT INRAE 1158 BioEcoAgro - Biologie des Plantes et Innovation, Université de Picardie Jules Verne, UFR des Sciences, 33 Rue St Leu, 80039 Amiens, France
| | - Corinne Pau-Roblot
- UMRT INRAE 1158 BioEcoAgro - Biologie des Plantes et Innovation, Université de Picardie Jules Verne, UFR des Sciences, 33 Rue St Leu, 80039 Amiens, France.
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Arpana M, Fasim A, Rathore SSS, Rao A, More SS, Rachaiah BP. Thermoalkalophilic polygalacturonase from a novel Glutamicibacter sp.: Bioprospecting, strain improvement, statistical optimization and applications. BIORESOURCE TECHNOLOGY 2024; 394:130283. [PMID: 38163489 DOI: 10.1016/j.biortech.2023.130283] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/30/2023] [Revised: 12/29/2023] [Accepted: 12/29/2023] [Indexed: 01/03/2024]
Abstract
The current research discusses a multidimensional bioprocess development, that includes bioprospecting, strain improvement, media optimisation, and applications of the extracted enzyme. A potent alkalophilic polygalacturonase (PG) producing bacterial strain was isolated and identified as a novel Glutamicibacter sp. Furthermore, strain improvement by UV and chemical mutagenesis not only improved the enzyme (PGmut) production but also enhanced its temperature optima from 37 °C to 50 °C. The use of solid substrate fermentation, followed bystatistical optimisation through PB and RSM, substantially increasedPGmut production. A 10-fold increase in enzyme production (632 U/gm) was observed when sugarcane bagasse with a pH of 10.5, 66.8 % moisture, and an inoculum size of 10.15 % was used. The model's accuracy was supported by p-value (p < 0.0001), and an R2 of 0.9940. A pilot-scale experiment, demonstrated ≈ 62,229 U/100 gm PG activity. Additionally, the enzyme's efficacy in demucilization of coffee beans, and bioscouring of jute fibre indicated that it is a valuable biocatalyst.
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Affiliation(s)
- Mary Arpana
- School of Basic and Applied Sciences, Dayananda Sagar University, Bangalore 560078, Karnataka, India
| | - Aneesa Fasim
- School of Basic and Applied Sciences, Dayananda Sagar University, Bangalore 560078, Karnataka, India.
| | | | - Archana Rao
- School of Basic and Applied Sciences, Dayananda Sagar University, Bangalore 560078, Karnataka, India
| | - Sunil Shivajirao More
- School of Basic and Applied Sciences, Dayananda Sagar University, Bangalore 560078, Karnataka, India
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Hu Y, Liu Y, Zhang J, Zhou Z, Wang J, Chen H, Huang M, Hu H, Dai Z, Jia K. Depletion of L-Methionine in Foods with an Engineered Thermophilic Methionine γ-lyase Efficiently Inhibits Tumor Growth. JOURNAL OF AGRICULTURAL AND FOOD CHEMISTRY 2023. [PMID: 37909421 DOI: 10.1021/acs.jafc.3c05293] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/03/2023]
Abstract
Dietary restriction of l-methionine, an essential amino acid, exerts potent antitumor effects on l-methionine-dependent cancers. However, dietary restriction of l-methionine has not been practical for human therapy because of the problem with the administration of l-methionine concentration in foods. Here, a thermophilic methionine γ-lyase (MGL), that catalyzes the cleavage of the C-S bond in l-methionine to produce α-ketobutyric acid, methanethiol, and ammonia was engineered from human cystathionine γ-lyase and almost completely depleted l-methionine at 65 °C, a temperature that accelerates the volatilization of methanethiol and its oxidation products. The high efficiency of l-methionine lysis may be attributed to the cooperative fluctuation and moderate the structural rigidity of 4 monomers in the thermophilic MGL, which facilitates l-methionine access to the entrance of the active site. Experimental diets treated with thermophilic MGL markedly inhibited prostate tumor growth in mice, and in parallel, the in vivo concentrations of l-methionine, its transformation product l-cysteine, and the oxidative stress indicator malondialdehyde significantly decreased. These findings provide a technology for the depletion of l-methionine in foods with an engineered thermophilic MGL, which efficiently inhibits tumor growth in mice.
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Affiliation(s)
- Yangming Hu
- Cooperative Innovation Center of Industrial Fermentation (Ministry of Education & Hubei Province), Key Laboratory of Fermentation Engineering (Ministry of Education), Hubei Key Laboratory of Industrial Microbiology, National "111" Center for Cellular Regulation and Molecular Pharmaceutics, Hubei University of Technology, Wuhan 430068, China
| | - Yan Liu
- Cooperative Innovation Center of Industrial Fermentation (Ministry of Education & Hubei Province), Key Laboratory of Fermentation Engineering (Ministry of Education), Hubei Key Laboratory of Industrial Microbiology, National "111" Center for Cellular Regulation and Molecular Pharmaceutics, Hubei University of Technology, Wuhan 430068, China
| | - Jiulin Zhang
- Cooperative Innovation Center of Industrial Fermentation (Ministry of Education & Hubei Province), Key Laboratory of Fermentation Engineering (Ministry of Education), Hubei Key Laboratory of Industrial Microbiology, National "111" Center for Cellular Regulation and Molecular Pharmaceutics, Hubei University of Technology, Wuhan 430068, China
| | - Zhijing Zhou
- Cooperative Innovation Center of Industrial Fermentation (Ministry of Education & Hubei Province), Key Laboratory of Fermentation Engineering (Ministry of Education), Hubei Key Laboratory of Industrial Microbiology, National "111" Center for Cellular Regulation and Molecular Pharmaceutics, Hubei University of Technology, Wuhan 430068, China
| | - Jiaxue Wang
- Cooperative Innovation Center of Industrial Fermentation (Ministry of Education & Hubei Province), Key Laboratory of Fermentation Engineering (Ministry of Education), Hubei Key Laboratory of Industrial Microbiology, National "111" Center for Cellular Regulation and Molecular Pharmaceutics, Hubei University of Technology, Wuhan 430068, China
| | - Hongyang Chen
- Cooperative Innovation Center of Industrial Fermentation (Ministry of Education & Hubei Province), Key Laboratory of Fermentation Engineering (Ministry of Education), Hubei Key Laboratory of Industrial Microbiology, National "111" Center for Cellular Regulation and Molecular Pharmaceutics, Hubei University of Technology, Wuhan 430068, China
| | - Meina Huang
- Cooperative Innovation Center of Industrial Fermentation (Ministry of Education & Hubei Province), Key Laboratory of Fermentation Engineering (Ministry of Education), Hubei Key Laboratory of Industrial Microbiology, National "111" Center for Cellular Regulation and Molecular Pharmaceutics, Hubei University of Technology, Wuhan 430068, China
| | - Han Hu
- Cooperative Innovation Center of Industrial Fermentation (Ministry of Education & Hubei Province), Key Laboratory of Fermentation Engineering (Ministry of Education), Hubei Key Laboratory of Industrial Microbiology, National "111" Center for Cellular Regulation and Molecular Pharmaceutics, Hubei University of Technology, Wuhan 430068, China
| | - Zongjie Dai
- Tianjin Institute of Industrial Biotechnology, Chinese Academy of Sciences, Tianjin 300308, China
| | - Kaizhi Jia
- Cooperative Innovation Center of Industrial Fermentation (Ministry of Education & Hubei Province), Key Laboratory of Fermentation Engineering (Ministry of Education), Hubei Key Laboratory of Industrial Microbiology, National "111" Center for Cellular Regulation and Molecular Pharmaceutics, Hubei University of Technology, Wuhan 430068, China
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Liu S, Tian L, Cong Y, Shi Q, Wang L, Lu Y, Wang L, Yang G. Recent advances in polygalacturonase: Industrial applications and challenges. Carbohydr Res 2023; 528:108816. [PMID: 37094533 DOI: 10.1016/j.carres.2023.108816] [Citation(s) in RCA: 2] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/27/2022] [Revised: 04/17/2023] [Accepted: 04/18/2023] [Indexed: 04/26/2023]
Abstract
This review focuses on the applications of polygalacturonase (PG), one of the most commercially produced enzymes on the biocatalyst market, in the food, beverage, feed, textile, and paper industries. Most PGs are acidic mesophilic enzymes, as shown by a summary of their biochemical properties. However, the acidic PGs discovered to date are insufficiently effective for industrial applications. The sequence and structural characteristics of thermophilic PGs are analyzed based on the results of extensive discussions regarding the catalytic mechanism and structural characteristics of PGs with shared right-handed parallel β-helical structures. In addition, the molecular modification methods for obtaining thermostable PGs are systematically presented. Notably, the demand for alkaline heat-resistant PGs has increased significantly concurrent with the biomanufacturing industry development. Therefore, this review also provides a theoretical guideline for mining heat-resistant PG gene resources and modifying PG thermostability.
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Affiliation(s)
- Siyi Liu
- College of Fisheries and Life Science, Dalian Ocean University, Dalian, 116023, China; Engineering Research Center of Shellfish Culture and Breeding in Liaoning Province, Dalian, 116023, China; Key Laboratory of Environment Controlled Aquaculture, Ministry of Education, Dalian, 116023, China
| | - Linfang Tian
- College of Fisheries and Life Science, Dalian Ocean University, Dalian, 116023, China; Engineering Research Center of Shellfish Culture and Breeding in Liaoning Province, Dalian, 116023, China; Key Laboratory of Environment Controlled Aquaculture, Ministry of Education, Dalian, 116023, China
| | - Yuting Cong
- College of Fisheries and Life Science, Dalian Ocean University, Dalian, 116023, China; Engineering Research Center of Shellfish Culture and Breeding in Liaoning Province, Dalian, 116023, China; Key Laboratory of Environment Controlled Aquaculture, Ministry of Education, Dalian, 116023, China
| | - Qianqian Shi
- College of Fisheries and Life Science, Dalian Ocean University, Dalian, 116023, China; Engineering Research Center of Shellfish Culture and Breeding in Liaoning Province, Dalian, 116023, China; Key Laboratory of Environment Controlled Aquaculture, Ministry of Education, Dalian, 116023, China
| | - Lianshun Wang
- College of Fisheries and Life Science, Dalian Ocean University, Dalian, 116023, China
| | - Yanan Lu
- College of Fisheries and Life Science, Dalian Ocean University, Dalian, 116023, China; Engineering Research Center of Shellfish Culture and Breeding in Liaoning Province, Dalian, 116023, China; Key Laboratory of Environment Controlled Aquaculture, Ministry of Education, Dalian, 116023, China
| | - Li Wang
- College of Fisheries and Life Science, Dalian Ocean University, Dalian, 116023, China; Engineering Research Center of Shellfish Culture and Breeding in Liaoning Province, Dalian, 116023, China; Key Laboratory of Environment Controlled Aquaculture, Ministry of Education, Dalian, 116023, China
| | - Guojun Yang
- College of Fisheries and Life Science, Dalian Ocean University, Dalian, 116023, China; Engineering Research Center of Shellfish Culture and Breeding in Liaoning Province, Dalian, 116023, China; Key Laboratory of Environment Controlled Aquaculture, Ministry of Education, Dalian, 116023, China.
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An alkalophilic and thermostable polygalacturonase (PGase) from Pseudomonas sp. 13159349: purification, biochemical characterization and its efficacy in olive oil extraction. Biologia (Bratisl) 2023. [DOI: 10.1007/s11756-022-01310-5] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/11/2023]
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Ding S, Liu X, Hakulinen N, Taherzadeh MJ, Wang Y, Wang Y, Qin X, Wang X, Yao B, Luo H, Tu T. Boosting enzymatic degradation of cellulose using a fungal expansin: Structural insight into the pretreatment mechanism. BIORESOURCE TECHNOLOGY 2022; 358:127434. [PMID: 35680086 DOI: 10.1016/j.biortech.2022.127434] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/06/2022] [Revised: 06/03/2022] [Accepted: 06/04/2022] [Indexed: 06/15/2023]
Abstract
The recalcitrance of cellulosic biomass greatly hinders its enzymatic degradation. Expansins induce cell wall loosening and promote efficient cellulose utilization; however, the molecular mechanism underlying their action is not well understood. In this study, TlEXLX1, a fungal expansin from Talaromyces leycettanus JCM12802, was characterized in terms of phylogeny, synergy, structure, and mechanism of action. TlEXLX1 displayed varying degrees of synergism with commercial cellulase in the pretreatment of corn straw and filter paper. TlEXLX1 binds to cellulose via domain 2, mediated by CH-π interactions with residues Tyr291, Trp292, and Tyr327. Residues Asp237, Glu238, and Asp248 in domain 1 form hydrogen bonds with glucose units and break the inherent hydrogen bonding within the cellulose matrix. This study identified the expansin amino acid residues crucial for cellulose binding, and elucidated the structure and function of expansins in cell wall networks; this has potential applications in biomass utilization.
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Affiliation(s)
- Sunjia Ding
- State Key Laboratory of Animal Nutrition, Institute of Animal Sciences, Chinese Academy of Agricultural Sciences, Beijing 100193, China
| | - Xiaoqing Liu
- Biotechnology Research Institute, Chinese Academy of Agricultural Sciences, Beijing 100081, China
| | - Nina Hakulinen
- Department of Chemistry, University of Eastern Finland, Joensuu 80130, Finland
| | | | - Yaru Wang
- State Key Laboratory of Animal Nutrition, Institute of Animal Sciences, Chinese Academy of Agricultural Sciences, Beijing 100193, China
| | - Yuan Wang
- State Key Laboratory of Animal Nutrition, Institute of Animal Sciences, Chinese Academy of Agricultural Sciences, Beijing 100193, China
| | - Xing Qin
- State Key Laboratory of Animal Nutrition, Institute of Animal Sciences, Chinese Academy of Agricultural Sciences, Beijing 100193, China
| | - Xiaolu Wang
- State Key Laboratory of Animal Nutrition, Institute of Animal Sciences, Chinese Academy of Agricultural Sciences, Beijing 100193, China
| | - Bin Yao
- State Key Laboratory of Animal Nutrition, Institute of Animal Sciences, Chinese Academy of Agricultural Sciences, Beijing 100193, China
| | - Huiying Luo
- State Key Laboratory of Animal Nutrition, Institute of Animal Sciences, Chinese Academy of Agricultural Sciences, Beijing 100193, China
| | - Tao Tu
- State Key Laboratory of Animal Nutrition, Institute of Animal Sciences, Chinese Academy of Agricultural Sciences, Beijing 100193, China.
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Enhancing the Thermostability of Phytase to Boiling Point by Evolution-Guided Design. Appl Environ Microbiol 2022; 88:e0050622. [PMID: 35546578 DOI: 10.1128/aem.00506-22] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022] Open
Abstract
The good thermostability of enzymes is an important basis for their wide application in industry. In this study, the phytase APPA from Yersinia intermedia was designed by evolution-guided design. Through the collection of homologous sequences in the NCBI database, we obtained a sequence set composed of 5,569 sequences, counted the number and locations of motif N-X-T/S, and selected the sites with high frequency in evolution as candidate sites for experiments. Based on the principle that N-glycosylation modification sites are located on the protein surface, 13 mutants were designed to optimize the number and location of N-glycosylation sites. Through experimental verification, 7 single mutants with improved thermostability were obtained. The best mutant, M14, with equal catalytic efficiency as the wild-type was obtained through combined mutation. The half-life (t1/2) value of mutant M14 was improved from 3.32 min at 65°C to 25 min of at 100°C, allowing it to withstand boiling water treatment, retaining approximately 75% initial activity after a 10-min incubation at 100°C. Differential scanning calorimetry analysis revealed that while the mutants' thermodynamic stability was nearly unchanged, their kinetic stability was greatly improved, and the combined mutant exhibited strong refolding ability. The results of a in vitro digestibility test indicated that the application effect of mutant M14 was about 4.5 times that of wild-type APPA, laying a foundation for its industrial application. IMPORTANCE Due to the harsh reaction conditions of industrial production, the relative instability of enzymes limits their application in industrial production, such as for food, pharmaceuticals, and feed. For example, the pelleting process of feed includes a brief high temperature (80 to 85°C), which requires the enzyme to have excellent thermostability. Therefore, a simple and effective method to improve the thermostability of enzymes has important practical value. In this study, we make full use of the existing homologous sequences (5,569) in the database to statistically analyze the existence frequency of N-X-T/S motifs in this large sequence space to design the phytase APPA with improved thermostability and a high hit rate (~50%). We obtained the best combination mutant, M14, that can tolerate boiling water treatment and greatly improved its kinetic stability without damaging its specific activity. Simultaneously, we proved that its performance improvement is due to its enhanced refolding ability, which comes from N-glycan modification rather than amino acid replacement. Our results provide a feasible and effective method for the modification of enzyme thermostability.
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Wang S, Meng K, Su X, Hakulinen N, Wang Y, Zhang J, Luo H, Yao B, Huang H, Tu T. Cysteine Engineering of an Endo-polygalacturonase from Talaromyces leycettanus JCM 12802 to Improve Its Thermostability. JOURNAL OF AGRICULTURAL AND FOOD CHEMISTRY 2021; 69:6351-6359. [PMID: 34043362 DOI: 10.1021/acs.jafc.1c01618] [Citation(s) in RCA: 6] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/12/2023]
Abstract
Thermostable enzymes have many advantages for industrial applications. Therefore, in this study, computer-aided design technology was used to improve the thermostability of a highly active endo-polygalacturonase from Talaromyces leycettanus JCM12802 at an optimal temperature of 70 °C. The melting temperature and specific activity of the obtained mutant T316C/G344C were increased by 10 °C and 36.5%, respectively, compared with the wild-type enzyme. The crystal structure of the T316C/G344C mutant showed no formation of a disulfide bond between the introduced cysteines, indicating a different mechanism than the conventional mechanism underlying improved enzyme thermostability. The cysteine substitutions directly formed a new alkyl hydrophobic interaction and caused conformational changes in the side chains of the adjacent residues Asn315 and Thr343, which in turn caused a local reconstruction of hydrogen bonds. This method greatly improved the thermostability of the enzyme without affecting its activity; thus, our findings are of great significance for both theoretical research and practical applications.
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Affiliation(s)
- Sheng Wang
- State Key Laboratory of Animal Nutrition, Institute of Animal Sciences, Chinese Academy of Agricultural Sciences, Beijing 100193, China
- Key Laboratory of Feed Biotechnology of Ministry of Agriculture and Rural Affairs, Feed Research Institute, Chinese Academy of Agricultural Sciences, Beijing 100081, China
| | - Kun Meng
- Key Laboratory of Feed Biotechnology of Ministry of Agriculture and Rural Affairs, Feed Research Institute, Chinese Academy of Agricultural Sciences, Beijing 100081, China
| | - Xiaoyun Su
- State Key Laboratory of Animal Nutrition, Institute of Animal Sciences, Chinese Academy of Agricultural Sciences, Beijing 100193, China
| | - Nina Hakulinen
- Department of Chemistry, University of Eastern Finland, Joensuu 80130, Finland
| | - Yaru Wang
- State Key Laboratory of Animal Nutrition, Institute of Animal Sciences, Chinese Academy of Agricultural Sciences, Beijing 100193, China
| | - Jie Zhang
- State Key Laboratory of Animal Nutrition, Institute of Animal Sciences, Chinese Academy of Agricultural Sciences, Beijing 100193, China
| | - Huiying Luo
- State Key Laboratory of Animal Nutrition, Institute of Animal Sciences, Chinese Academy of Agricultural Sciences, Beijing 100193, China
| | - Bin Yao
- State Key Laboratory of Animal Nutrition, Institute of Animal Sciences, Chinese Academy of Agricultural Sciences, Beijing 100193, China
| | - Huoqing Huang
- State Key Laboratory of Animal Nutrition, Institute of Animal Sciences, Chinese Academy of Agricultural Sciences, Beijing 100193, China
| | - Tao Tu
- State Key Laboratory of Animal Nutrition, Institute of Animal Sciences, Chinese Academy of Agricultural Sciences, Beijing 100193, China
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