1
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Hu L, Li X, Li C, Wang L, Han L, Ni W, Zhou P, Hu S. Characterization of a novel multifunctional glycoside hydrolase family in the metagenome-assembled genomes of horse gut. Gene 2024:148758. [PMID: 38977109 DOI: 10.1016/j.gene.2024.148758] [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: 02/19/2024] [Revised: 05/29/2024] [Accepted: 07/05/2024] [Indexed: 07/10/2024]
Abstract
The gut microbiota is a treasure trove of carbohydrate-active enzymes (CAZymes). To explore novel and efficient CAZymes, we analyzed the 4,142 metagenome-assembled genomes (MAGs) of the horse gut microbiota and found the MAG117.bin13 genome (Bacteroides fragilis) contains the highest number of polysaccharide utilisation loci sites (PULs), indicating its high capability for carbohydrate degradation. Bioinformatics analysis indicate that the PULs region of the MAG117.bin13 genome encodes many hypothetical proteins, which are important sources for exploring novel CAZymes. Interestingly, we discovered a hypothetical protein (595 amino acids). This protein exhibits potential CAZymes activity and has a lower similarity to CAZymes, we named it BfLac2275. We purified the protein using prokaryotic expression technology and studied its enzymatic function. The hydrolysis experiment of the polysaccharide substrate showed that the BfLac2275 protein has the ability to degrade α-lactose (156.94 U/mg), maltose (92.59 U/mg), raffinose (86.81 U/mg), and hyaluronic acid (5.71 U/mg). The enzyme activity is optimal at pH 5.0 and 30 ℃, indicating that the hypothetical protein BfLac2275 is a novel and multifunctional CAZymes in the glycoside hydrolases (GHs). These properties indicate that BfLac2275 has broad application prospects in many fields such as plant polysaccharide decomposition, food industry, animal feed additives and enzyme preparations. This study not only serves as a reference for exploring novel CAZymes encoded by gut microbiota but also provides an example for further studying the functional annotation of hypothetical genes in metagenomic assembly genomes.
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Affiliation(s)
- Lingling Hu
- College of Life Sciences, Shihezi University, Shihezi, Xinjiang 832003, China
| | - Xiaoyue Li
- College of Life Sciences, Shihezi University, Shihezi, Xinjiang 832003, China
| | - Cunyuan Li
- College of Life Sciences, Shihezi University, Shihezi, Xinjiang 832003, China
| | - Limin Wang
- State Key Laboratory of Sheep Genetic Improvement and Healthy Production, Xinjiang Academy of Agricultural and Reclamation Science, Xinjiang 832003, China
| | - Lin Han
- College of Life Sciences, Shihezi University, Shihezi, Xinjiang 832003, China
| | - Wei Ni
- College of Life Sciences, Shihezi University, Shihezi, Xinjiang 832003, China.
| | - Ping Zhou
- State Key Laboratory of Sheep Genetic Improvement and Healthy Production, Xinjiang Academy of Agricultural and Reclamation Science, Xinjiang 832003, China.
| | - Shengwei Hu
- College of Life Sciences, Shihezi University, Shihezi, Xinjiang 832003, China.
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2
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Wang P, Pei X, Zhou W, Zhao Y, Gu P, Li Y, Gao J. Research and application progress of microbial β-mannanases: a mini-review. World J Microbiol Biotechnol 2024; 40:169. [PMID: 38630389 DOI: 10.1007/s11274-024-03985-1] [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: 03/05/2024] [Accepted: 04/08/2024] [Indexed: 04/19/2024]
Abstract
Mannan is a predominant constituent of cork hemicellulose and is widely distributed in various plant tissues. β-Mannanase is the principal mannan-degrading enzyme, which breaks down the β-1,4-linked mannosidic bonds in mannans in an endo-acting manner. Microorganisms are a valuable source of β-mannanase, which exhibits catalytic activity in a wide range of pH and temperature, making it highly versatile and applicable in pharmaceuticals, feed, paper pulping, biorefinery, and other industries. Here, the origin, classification, enzymatic properties, molecular modification, immobilization, and practical applications of microbial β-mannanases are reviewed, the future research directions for microbial β-mannanases are also outlined.
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Affiliation(s)
- Ping Wang
- School of Biological Science and Technology, University of Jinan, Jinan, 250022, PR China
| | - Xiaohui Pei
- Department of Obstetrics and Gynecology, The Second Affiliated Hospital of Shandong First Medical University, Taian, 271000, PR China
| | - Weiqiang Zhou
- Weili Biotechnology (Shandong) Co., Ltd, Taian, 271400, PR China
| | - Yue Zhao
- School of Biological Science and Technology, University of Jinan, Jinan, 250022, PR China
| | - Pengfei Gu
- School of Biological Science and Technology, University of Jinan, Jinan, 250022, PR China
| | - Yumei Li
- School of Biological Science and Technology, University of Jinan, Jinan, 250022, PR China.
| | - Juan Gao
- School of Biological Science and Technology, University of Jinan, Jinan, 250022, PR China.
- Shandong Engineering Research Center of Key Technologies for High-Value and High-Efficiency Full Industry Chain of Lonicera japonica, Linyi, 273399, PR China.
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3
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Zhu Q, Huang Y, Yang Z, Wu X, Zhu Q, Zheng H, Zhu D, Lv Z, Yin Y. A Recombinant Thermophilic and Glucose-Tolerant GH1 β-Glucosidase Derived from Hehua Hot Spring. Molecules 2024; 29:1017. [PMID: 38474529 DOI: 10.3390/molecules29051017] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/01/2024] [Revised: 02/18/2024] [Accepted: 02/23/2024] [Indexed: 03/14/2024] Open
Abstract
As a crucial enzyme for cellulose degradation, β-glucosidase finds extensive applications in food, feed, and bioethanol production; however, its potential is often limited by inadequate thermal stability and glucose tolerance. In this study, a functional gene (lq-bg5) for a GH1 family β-glucosidase was obtained from the metagenomic DNA of a hot spring sediment sample and heterologously expressed in E. coli and the recombinant enzyme was purified and characterized. The optimal temperature and pH of LQ-BG5 were 55 °C and 4.6, respectively. The relative residual activity of LQ-BG5 exceeded 90% at 55 °C for 9 h and 60 °C for 6 h and remained above 100% after incubation at pH 5.0-10.0 for 12 h. More importantly, LQ-BG5 demonstrated exceptional glucose tolerance with more than 40% activity remaining even at high glucose concentrations of 3000 mM. Thus, LQ-BG5 represents a thermophilic β-glucosidase exhibiting excellent thermal stability and remarkable glucose tolerance, making it highly promising for lignocellulose development and utilization.
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Affiliation(s)
- Qian Zhu
- College of Agriculture and Biological Science, Dali University, Dali 671003, China
| | - Yuying Huang
- College of Agriculture and Biological Science, Dali University, Dali 671003, China
- Key Laboratory of Bioinformatics and Computational Biology, Department of Education of Yunnan Province, Dali University, Dali 671003, China
| | - Zhengfeng Yang
- College of Agriculture and Biological Science, Dali University, Dali 671003, China
| | - Xingci Wu
- College of Agriculture and Biological Science, Dali University, Dali 671003, China
| | - Qianru Zhu
- College of Agriculture and Biological Science, Dali University, Dali 671003, China
| | - Hongzhao Zheng
- College of Agriculture and Biological Science, Dali University, Dali 671003, China
| | - Dan Zhu
- College of Agriculture and Biological Science, Dali University, Dali 671003, China
| | - Zhihua Lv
- College of Agriculture and Biological Science, Dali University, Dali 671003, China
- Cangshan Forest Ecosystem Observation and Research Station of Yunnan Province, Dali University, Dali 671003, China
| | - Yirui Yin
- College of Agriculture and Biological Science, Dali University, Dali 671003, China
- Key Laboratory of Bioinformatics and Computational Biology, Department of Education of Yunnan Province, Dali University, Dali 671003, China
- Cangshan Forest Ecosystem Observation and Research Station of Yunnan Province, Dali University, Dali 671003, China
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4
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Mo H, Chen X, Tang M, Qu Y, Li Z, Liu W, Yang C, Chen Y, Sun J, Yang H, Du G. Expression of a thermostable glucose-stimulated β-glucosidase from a hot-spring metagenome and its promising application to produce gardenia blue. Bioorg Chem 2024; 143:107036. [PMID: 38141330 DOI: 10.1016/j.bioorg.2023.107036] [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: 10/27/2023] [Revised: 12/06/2023] [Accepted: 12/14/2023] [Indexed: 12/25/2023]
Abstract
This study reports a thermostable glucose-stimulated β-glucosidase, BglY442, from hot-spring metagenomic data that was cloned and expressed in Escherichia coli BL21 (DE3). The molecular mass of recombinant BglY442 was 69.9 kDa and was used in the production of gardenia blue. The recombinant BglY442 showed its maximum activity at pH 6.0 and 75 °C, maintained 50 % activity at 70 °C for 36 h, presented over 90 % activity in a broad pH range and a wide range of pH stability. Moreover, BglY442 exhibited excellent tolerance toward methanol and ethanol. The specific activity of BglY442 was 235 U/mg at pH 6.0 and 75 °C with 10 mM pNPG as substrate. BglY442 activity increased by over fourfold with 2 M glucose or xylose. Specifically, the enzyme kinetics of BglY442 seem to be non-Michaelis-Menten kinetics or atypical kinetics because the Michaelis-Menten saturation kinetics were not observed with pNPG, oNPG or geniposide as substrates. Under optimum conditions, geniposide was dehydrated by BglY442 and reacted with nine amino acids respectively by the one-pot method. Only the Arg or Met derived pigments showed bright blue, and these two pigments had similar ultraviolet absorption spectra. The OD590 nm of GB was detected to be 1.06 after 24 h with the addition of Arg and 1.61 after 36 h with the addition of Met. The intermediate was elucidated and identified as ginipin. Molecular docking analysis indicated that the enzyme had a similar catalytic mechanism to the reported GH1 Bgls. BglY442 exhibited potential for gardenia blue production by the one-pot method. With outstanding thermostability and glucose tolerance, BglY442 should be considered a potential β-glucosidase in biotechnology applications.
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Affiliation(s)
- Haiying Mo
- Yunnan Minzu University, Key Laboratory of Chemistry in Ethnic Medicinal Resources Ministry of Education, Kunming, Yunnan, China
| | - Xin Chen
- Yunnan Minzu University, Key Laboratory of Chemistry in Ethnic Medicinal Resources Ministry of Education, Kunming, Yunnan, China
| | - Manwen Tang
- Yunnan Minzu University, Key Laboratory of Chemistry in Ethnic Medicinal Resources Ministry of Education, Kunming, Yunnan, China
| | - Ying Qu
- Yunnan Minzu University, Key Laboratory of Chemistry in Ethnic Medicinal Resources Ministry of Education, Kunming, Yunnan, China
| | - Zhihao Li
- Yunnan Minzu University, Key Laboratory of Chemistry in Ethnic Medicinal Resources Ministry of Education, Kunming, Yunnan, China
| | - Wang Liu
- Yunnan Minzu University, Key Laboratory of Chemistry in Ethnic Medicinal Resources Ministry of Education, Kunming, Yunnan, China
| | - Chunlin Yang
- Yunnan Minzu University, Key Laboratory of Chemistry in Ethnic Medicinal Resources Ministry of Education, Kunming, Yunnan, China
| | - Yijian Chen
- Yunnan Minzu University, Key Laboratory of Chemistry in Ethnic Medicinal Resources Ministry of Education, Kunming, Yunnan, China
| | - Jingxian Sun
- Yunnan Minzu University, Key Laboratory of Chemistry in Ethnic Medicinal Resources Ministry of Education, Kunming, Yunnan, China
| | - Haiying Yang
- Yunnan Minzu University, School of Chemistry and Environment, Kunming, Yunnan, China.
| | - Gang Du
- Yunnan Minzu University, Key Laboratory of Chemistry in Ethnic Medicinal Resources Ministry of Education, Kunming, Yunnan, China.
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Erkanli ME, El-Halabi K, Kim JR. Exploring the diversity of β-glucosidase: Classification, catalytic mechanism, molecular characteristics, kinetic models, and applications. Enzyme Microb Technol 2024; 173:110363. [PMID: 38041879 DOI: 10.1016/j.enzmictec.2023.110363] [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: 09/25/2023] [Revised: 11/17/2023] [Accepted: 11/18/2023] [Indexed: 12/04/2023]
Abstract
High-value chemicals and energy-related products can be produced from biomass. Biorefinery technology offers a sustainable and cost-effective method for this high-value conversion. β-glucosidase is one of the key enzymes in biorefinery processes, catalyzing the production of glucose from aryl-glycosides and cello-oligosaccharides via the hydrolysis of β-glycosidic bonds. Although β-glucosidase plays a critical catalytic role in the utilization of cellulosic biomass, its efficacy is often limited by substrate or product inhibitions, low thermostability, and/or insufficient catalytic activity. To provide a detailed overview of β-glucosidases and their benefits in certain desired applications, we collected and summarized extensive information from literature and public databases, covering β-glucosidases in different glycosidase hydrolase families and biological kingdoms. These β-glucosidases show differences in amino acid sequence, which are translated into varying degrees of the molecular properties critical in enzymatic applications. This review describes studies on the diversity of β-glucosidases related to the classification, catalytic mechanisms, key molecular characteristics, kinetics models, and applications, and highlights several β-glucosidases displaying high stability, activity, and resistance to glucose inhibition suitable for desired biotechnological applications.
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Affiliation(s)
- Mehmet Emre Erkanli
- Department of Chemical and Biomolecular Engineering, New York University, 6 MetroTech Center, Brooklyn, NY 11201, United States
| | - Khalid El-Halabi
- Department of Chemical and Biomolecular Engineering, New York University, 6 MetroTech Center, Brooklyn, NY 11201, United States
| | - Jin Ryoun Kim
- Department of Chemical and Biomolecular Engineering, New York University, 6 MetroTech Center, Brooklyn, NY 11201, United States.
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6
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Liu S, Zhang M, Hong D, Fang Z, Xiao Y, Fang W, Zhang X. Improving the cellobiose hydrolysis activity of glucose-stimulating β-glucosidase Bgl2A. Enzyme Microb Technol 2023; 169:110289. [PMID: 37473697 DOI: 10.1016/j.enzmictec.2023.110289] [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: 04/07/2023] [Revised: 06/05/2023] [Accepted: 07/11/2023] [Indexed: 07/22/2023]
Abstract
β-Glucosidases with high catalytic activity and glucose tolerant properties possess promising applications in lignocellulose-based industries. To obtain enzymes possessing these properties, a semi-rational strategy was employed to engineer the glucose-stimulating β-glucosidase Bgl2A for high cellobiose hydrolysis activity. A total of 18 mutants were constructed. A22S, V224D, and A22S/V224D exhibited high specific activities of 272.06, 237.60, and 239.29 U/mg toward cellobiose, which were 2.5- to 2.8-fold of Bgl2A. A22S, V224D, and A22S/V224D exhibited increased kcat values, which were 2.7- to 3.1-fold of Bgl2A. A22S and V224D maintained glucose-stimulating property, whereas A22S/V224D lost it. Using 150 g/L cellobiose as the substrate, the amount of glucose produced by A22S was the highest, yielding 129.70 g/L glucose after 3 h reaction at 35 °C. The synergistic effects of the engineered enzymes with commercial cellulase on hydrolyzing cellulose were investigated. Supplemented with the commercial cellulase and A22S, the highest glucose amount of 23.30 g/L was yielded from cellulose with hydrolysis rate of 21.02 %. Given its high cellobiose hydrolysis activity and glucose-stimulating properties, A22S can be used as a component of enzyme cocktail to match mesophilic cellulases for efficient cellulose hydrolysis.
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Affiliation(s)
- Shuaifeng Liu
- School of Life Sciences, Anhui University; Hefei, Anhui 230601, China; Anhui Key Laboratory of Modern Biomanufacturing; Hefei, Anhui 230601, China; Anhui Provincial Engineering Technology Research Center of Microorganisms and Biocatalysis; Hefei, Anhui 230601, China
| | - Meng Zhang
- School of Life Sciences, Anhui University; Hefei, Anhui 230601, China; Anhui Key Laboratory of Modern Biomanufacturing; Hefei, Anhui 230601, China
| | - Dengwang Hong
- School of Life Sciences, Anhui University; Hefei, Anhui 230601, China; Anhui Key Laboratory of Modern Biomanufacturing; Hefei, Anhui 230601, China; Anhui Provincial Engineering Technology Research Center of Microorganisms and Biocatalysis; Hefei, Anhui 230601, China
| | - Zemin Fang
- School of Life Sciences, Anhui University; Hefei, Anhui 230601, China; Anhui Key Laboratory of Modern Biomanufacturing; Hefei, Anhui 230601, China; Anhui Provincial Engineering Technology Research Center of Microorganisms and Biocatalysis; Hefei, Anhui 230601, China
| | - Yazhong Xiao
- School of Life Sciences, Anhui University; Hefei, Anhui 230601, China; Anhui Key Laboratory of Modern Biomanufacturing; Hefei, Anhui 230601, China; Anhui Provincial Engineering Technology Research Center of Microorganisms and Biocatalysis; Hefei, Anhui 230601, China
| | - Wei Fang
- School of Life Sciences, Anhui University; Hefei, Anhui 230601, China; Anhui Key Laboratory of Modern Biomanufacturing; Hefei, Anhui 230601, China; Anhui Provincial Engineering Technology Research Center of Microorganisms and Biocatalysis; Hefei, Anhui 230601, China.
| | - Xuecheng Zhang
- School of Life Sciences, Anhui University; Hefei, Anhui 230601, China; Anhui Key Laboratory of Modern Biomanufacturing; Hefei, Anhui 230601, China; Anhui Provincial Engineering Technology Research Center of Microorganisms and Biocatalysis; Hefei, Anhui 230601, China.
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7
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Crystal structure of metagenomic β-glycosidase MeBglD2 in complex with various saccharides. Appl Microbiol Biotechnol 2022; 106:4539-4551. [PMID: 35723691 DOI: 10.1007/s00253-022-12018-6] [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: 03/08/2022] [Revised: 05/23/2022] [Accepted: 05/27/2022] [Indexed: 11/02/2022]
Abstract
Metagenomic MeBglD2 is a glycoside hydrolase family 1 (GH1) β-glycosidase that has β-glucosidase, β-fucosidase, and β-galactosidase activities, and is highly activated in the presence of monosaccharides and disaccharides. The β-glucosidase activity of MeBglD2 increases in a cellobiose concentration-dependent manner and is not inhibited by a high concentration of D-glucose or cellobiose. Previously, we solved the crystal structure of MeBglD2 and designed a thermostable mutant; however, the mechanism of substrate recognition of MeBglD2 remains poorly understood. In this paper, we report the X-ray crystal structures of MeBglD2 complexed with various saccharides, such as D-glucose, D-xylose, cellobiose, and maltose. The results showed that subsite - 1 of MeBglD2, which contained two catalytic glutamate residues (a nucleophilic Glu356 and an acid/base Glu170) was common to other GH1 enzymes, but the positive subsites (+ 1 and + 2) had different binding modes depending on the type of sugar. Three residues (Glu183, Asn227, and Asn229), located at the positive subsites of MeBglD2, were involved in substrate specificity toward cellobiose and/or chromogenic substrates in the presence of additive sugars. The docking simulation of MeBglD2-cellobiose indicated that Asn229 and Trp329 play important roles in the recognition of + 1 D-glucose in cellobiose. Our findings provide insights into the unique substrate recognition mechanism of GH1, which can incorporate a variety of saccharides into its positive subsites. KEY POINTS: • Metagenomic glycosidase, MeBglD2, recognizes various saccharides • Structures of metagenomic MeBglD2 complexed with various saccharides are determined • MeBglD2 has a unique substrate recognition mechanism at the positive subsites.
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8
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Nhim S, Waeonukul R, Uke A, Baramee S, Ratanakhanokchai K, Tachaapaikoon C, Pason P, Liu YJ, Kosugi A. Biological cellulose saccharification using a coculture of Clostridium thermocellum and Thermobrachium celere strain A9. Appl Microbiol Biotechnol 2022; 106:2133-2145. [PMID: 35157106 PMCID: PMC8930880 DOI: 10.1007/s00253-022-11818-0] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/13/2021] [Revised: 12/30/2021] [Accepted: 01/30/2022] [Indexed: 11/29/2022]
Abstract
Abstract An anaerobic thermophilic bacterial strain, A9 (NITE P-03545), that secretes β-glucosidase was newly isolated from wastewater sediments by screening using esculin. The 16S rRNA gene sequence of strain A9 had 100% identity with that of Thermobrachium celere type strain JW/YL-NZ35. The complete genome sequence of strain A9 showed 98.4% average nucleotide identity with strain JW/YL-NZ35. However, strain A9 had different physiological properties from strain JW/YL-NZ35, which cannot secrete β-glucosidases or grow on cellobiose as the sole carbon source. The key β-glucosidase gene (TcBG1) of strain A9, which belongs to glycoside hydrolase family 1, was characterized. Recombinant β-glucosidase (rTcBG1) hydrolyzed cellooligosaccharides to glucose effectively. Furthermore, rTcBG1 showed high thermostability (at 60°C for 2 days) and high glucose tolerance (IC50 = 0.75 M glucose), suggesting that rTcBG1 could be used for biological cellulose saccharification in cocultures with Clostridium thermocellum. High cellulose degradation was observed when strain A9 was cocultured with C. thermocellum in a medium containing 50 g/l crystalline cellulose, and glucose accumulation in the culture supernatant reached 35.2 g/l. In contrast, neither a monoculture of C. thermocellum nor coculture of C. thermocellum with strain JW/YL-NZ35 realized efficient cellulose degradation or high glucose accumulation. These results show that the β-glucosidase secreted by strain A9 degrades cellulose effectively in combination with C. thermocellum cellulosomes and has the potential to be used in a new biological cellulose saccharification process that does not require supplementation with β-glucosidases. Key points • Strain A9 can secrete a thermostable β-glucosidase that has high glucose tolerance • A coculture of strain A9 and C. thermocellum showed high cellulose degradation • Strain A9 achieves biological saccharification without addition of β-glucosidase Supplementary Information The online version contains supplementary material available at 10.1007/s00253-022-11818-0.
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Affiliation(s)
- Sreyneang Nhim
- School of Bioresources and Technology, King Mongkut's University of Technology Thonburi (KMUTT), 10150, Bangkok, Thailand
| | - Rattiya Waeonukul
- School of Bioresources and Technology, King Mongkut's University of Technology Thonburi (KMUTT), 10150, Bangkok, Thailand.,Excellent Center of Enzyme Technology and Microbial Utilization, Pilot Plant Development and Training Institute (PDTI), King Mongkut's University of Technology Thonburi (KMUTT), Bangkok, 10150, Thailand
| | - Ayaka Uke
- Biological Resources and Post-harvest Division, Japan International Research Center for Agricultural Sciences (JIRCAS), 1-1 Ohwashi, Tsukuba, Ibaraki, 305-8686, Japan
| | - Sirilak Baramee
- School of Bioresources and Technology, King Mongkut's University of Technology Thonburi (KMUTT), 10150, Bangkok, Thailand.,Excellent Center of Enzyme Technology and Microbial Utilization, Pilot Plant Development and Training Institute (PDTI), King Mongkut's University of Technology Thonburi (KMUTT), Bangkok, 10150, Thailand
| | - Khanok Ratanakhanokchai
- School of Bioresources and Technology, King Mongkut's University of Technology Thonburi (KMUTT), 10150, Bangkok, Thailand
| | - Chakrit Tachaapaikoon
- School of Bioresources and Technology, King Mongkut's University of Technology Thonburi (KMUTT), 10150, Bangkok, Thailand.,Excellent Center of Enzyme Technology and Microbial Utilization, Pilot Plant Development and Training Institute (PDTI), King Mongkut's University of Technology Thonburi (KMUTT), Bangkok, 10150, Thailand
| | - Patthra Pason
- School of Bioresources and Technology, King Mongkut's University of Technology Thonburi (KMUTT), 10150, Bangkok, Thailand.,Excellent Center of Enzyme Technology and Microbial Utilization, Pilot Plant Development and Training Institute (PDTI), King Mongkut's University of Technology Thonburi (KMUTT), Bangkok, 10150, Thailand
| | - Ya-Jun Liu
- CAS Key Laboratory of Biofuels, Qingdao Institute of Bioenergy and Bioprocess Technology, Chinese Academy of Sciences, Qingdao, 266101, People's Republic of China.,Shandong Energy Institute, Qingdao, 266101, People's Republic of China.,Qingdao New Energy Shandong Laboratory, Qingdao, 266101, People's Republic of China
| | - Akihiko Kosugi
- Biological Resources and Post-harvest Division, Japan International Research Center for Agricultural Sciences (JIRCAS), 1-1 Ohwashi, Tsukuba, Ibaraki, 305-8686, Japan.
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9
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Chen A, Wang D, Ji R, Li J, Gu S, Tang R, Ji C. Structural and Catalytic Characterization of TsBGL, a β-Glucosidase From Thermofilum sp. ex4484_79. Front Microbiol 2021; 12:723678. [PMID: 34659150 PMCID: PMC8517440 DOI: 10.3389/fmicb.2021.723678] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/11/2021] [Accepted: 08/25/2021] [Indexed: 11/13/2022] Open
Abstract
Beta-glucosidase is an enzyme that catalyzes the hydrolysis of the glycosidic bonds of cellobiose, resulting in the production of glucose, which is an important step for the effective utilization of cellulose. In the present study, a thermostable β-glucosidase was isolated and purified from the Thermoprotei Thermofilum sp. ex4484_79 and subjected to enzymatic and structural characterization. The purified β-glucosidase (TsBGL) exhibited maximum activity at 90°C and pH 5.0 and displayed maximum specific activity of 139.2μmol/min/mgzne against p-nitrophenyl β-D-glucopyranoside (pNPGlc) and 24.3μmol/min/mgzen against cellobiose. Furthermore, TsBGL exhibited a relatively high thermostability, retaining 84 and 47% of its activity after incubation at 85°C for 1.5h and 90°C for 1.5h, respectively. The crystal structure of TsBGL was resolved at a resolution of 2.14Å, which revealed a classical (α/β)8-barrel catalytic domain. A structural comparison of TsBGL with other homologous proteins revealed that its catalytic sites included Glu210 and Glu414. We provide the molecular structure of TsBGL and the possibility of improving its characteristics for potential applications in industries.
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Affiliation(s)
- Anke Chen
- State Key Laboratory of Genetic Engineering, Institute of Genetics, School of Life Sciences, Fudan University, Shanghai, China
| | - Dan Wang
- State Key Laboratory of Genetic Engineering, Institute of Genetics, School of Life Sciences, Fudan University, Shanghai, China
| | - Rui Ji
- State Key Laboratory of Genetic Engineering, Institute of Genetics, School of Life Sciences, Fudan University, Shanghai, China
| | - Jixi Li
- State Key Laboratory of Genetic Engineering, Institute of Genetics, School of Life Sciences, Fudan University, Shanghai, China
| | - Shaohua Gu
- State Key Laboratory of Genetic Engineering, Institute of Genetics, School of Life Sciences, Fudan University, Shanghai, China
| | - Rong Tang
- State Key Laboratory of Genetic Engineering, Institute of Genetics, School of Life Sciences, Fudan University, Shanghai, China
| | - Chaoneng Ji
- State Key Laboratory of Genetic Engineering, Institute of Genetics, School of Life Sciences, Fudan University, Shanghai, China
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10
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Ratuchne A, Knob A. A new and unusual β-glucosidase from Aspergillus fumigatus: Catalytic activity at high temperatures and glucose tolerance. BIOCATALYSIS AND AGRICULTURAL BIOTECHNOLOGY 2021. [DOI: 10.1016/j.bcab.2021.102064] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
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11
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Mondal S, Halder SK, Mondal KC. Tailoring in fungi for next generation cellulase production with special reference to CRISPR/CAS system. SYSTEMS MICROBIOLOGY AND BIOMANUFACTURING 2021; 2:113-129. [PMID: 38624901 PMCID: PMC8319711 DOI: 10.1007/s43393-021-00045-9] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 05/20/2021] [Revised: 07/14/2021] [Accepted: 07/15/2021] [Indexed: 12/14/2022]
Abstract
Cellulose is the utmost plenteous source of biopolymer in our earth, and fungi are the most efficient and ubiquitous organism in degrading the cellulosic biomass by synthesizing cellulases. Tailoring through genetic manipulation has played a substantial role in constructing novel fungal strains towards improved cellulase production of desired traits. However, the traditional methods of genetic manipulation of fungi are time-consuming and tedious. With the availability of the full-genome sequences of several industrially relevant filamentous fungi, CRISPR-CAS (clustered regularly interspaced short palindromic repeats/CRISPR-associated protein) technology has come into the focus for the proficient development of manipulated strains of filamentous fungi. This review summarizes the mode of action of cellulases, transcription level regulation for cellulase expression, various traditional strategies of genetic manipulation with CRISPR-CAS technology to develop modified fungal strains for a preferred level of cellulase production, and the futuristic trend in this arena of research.
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Affiliation(s)
- Subhadeep Mondal
- Center for Life Sciences, Vidyasagar University, Midnapore, 721102 West Bengal India
| | - Suman Kumar Halder
- Department of Microbiology, Vidyasagar University, Midnapore, 721102 West Bengal India
| | - Keshab Chandra Mondal
- Department of Microbiology, Vidyasagar University, Midnapore, 721102 West Bengal India
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12
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Lu Z, He B, Chen J, Wu LJ, Chen XB, Ye SQ, Yang WH, Shao ZY, Jin EG, Wang SJ, Zhou HB, Cao JY. Optimisation of the Conversion and Extraction of Arctigenin From Fructus arctii Into Arctiin Using Fungi. Front Microbiol 2021; 12:663116. [PMID: 34135874 PMCID: PMC8200475 DOI: 10.3389/fmicb.2021.663116] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/02/2021] [Accepted: 04/12/2021] [Indexed: 11/13/2022] Open
Abstract
Fructus arctii is commonly used in Chinese medicine, and arctiin and arctigenin are its main active ingredients. Arctiin has low bioavailability in the human body and needs to be converted into arctigenin by intestinal microbes before it can be absorbed into the blood. Arctigenin has antiviral, anti-inflammatory, and anti-tumour effects and its development has important value. In this study, we used external microbial fermentation with Aspergillus awamori and Trichoderma reesei to process and convert arctiin from F. arctii powder into arctigenin, hence increasing its bioavailability. We developed a fermentation process by optimising the carbon and nitrogen source/ratio, fermentation time, pH, liquid volume, inoculation volume, and substrate solid-liquid ratio. This allowed for an arctiin conversion rate of 99.84%, and the dissolution rate of the final product was 95.74%, with a loss rate as low as 4.26%. After the fermentation of F. arctii powder, the average yield of arctigenin is 19.51 mg/g. Crude fermented F. arctii extract was purified by silica gel column chromatography, and we observed an arctigenin purity of 99.33%. Our technique effectively converts arctiin and extracts arctigenin from F. arctii and provides a solid basis for further development and industrialisation.
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Affiliation(s)
- Zheng Lu
- College of Veterinary Medicine, Huazhong Agricultural University, Wuhan, China.,College of Veterinary Medicine, Northwest Agriculture & Forestry University, Yangling, China
| | - Bin He
- College of Veterinary Medicine, Huazhong Agricultural University, Wuhan, China.,Institute of Animal Husbandry and Veterinary, Wuhan Academy of Agricultural Sciences, Wuhan, China
| | - Jie Chen
- Institute of Animal Husbandry and Veterinary, Wuhan Academy of Agricultural Sciences, Wuhan, China
| | - Li-Jun Wu
- Institute of Animal Husbandry and Veterinary, Wuhan Academy of Agricultural Sciences, Wuhan, China
| | - Xia-Bing Chen
- Institute of Animal Husbandry and Veterinary, Wuhan Academy of Agricultural Sciences, Wuhan, China
| | - Sheng-Qiang Ye
- Institute of Animal Husbandry and Veterinary, Wuhan Academy of Agricultural Sciences, Wuhan, China
| | - Wen-Hai Yang
- Institute of Animal Husbandry and Veterinary, Wuhan Academy of Agricultural Sciences, Wuhan, China
| | - Zhi-Yong Shao
- Institute of Animal Husbandry and Veterinary, Wuhan Academy of Agricultural Sciences, Wuhan, China
| | - Er-Guang Jin
- Institute of Animal Husbandry and Veterinary, Wuhan Academy of Agricultural Sciences, Wuhan, China
| | - Si-Jiu Wang
- Institute of Animal Husbandry and Veterinary, Wuhan Academy of Agricultural Sciences, Wuhan, China
| | - Hong-Bo Zhou
- College of Veterinary Medicine, Huazhong Agricultural University, Wuhan, China
| | - Ji-Yue Cao
- College of Veterinary Medicine, Huazhong Agricultural University, Wuhan, China
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13
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Unconventional β-Glucosidases: A Promising Biocatalyst for Industrial Biotechnology. Appl Biochem Biotechnol 2021; 193:2993-3016. [PMID: 33871765 DOI: 10.1007/s12010-021-03568-y] [Citation(s) in RCA: 22] [Impact Index Per Article: 7.3] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/22/2020] [Accepted: 04/08/2021] [Indexed: 10/21/2022]
Abstract
β-Glucosidases primarily catalyze removal of terminal glucosyl residues from a variety of glucoconjugates and also perform transglycosylation and reverse hydrolysis. These catalytic properties can be readily exploited for degradation of lignocellulosic biomass as well as for pharmaceutical, food and flavor industries. β-Glucosidases have been either isolated in the native form from the producer organism or recombinantly expressed and gaged for their biochemical properties and substrate specificities. Although almond and Aspergillus niger have been instantly recognizable sources of β-glucosidases utilized for various applications, an intricate pool of novel β-glucosidases from different sources can provide their potent replacements. Moreover, one can envisage the better efficacy of these novel candidates in biofuel and biorefinery industries facilitating efficient degradation of biomass. This article reviews properties of the novel β-glucosidases such as glucose tolerance and activation, substrate specificity, and thermostability which can be useful for their applications in lignocellulose degradation, food industry, and pharmaceutical industry in comparison with the β-glucosidases from the conventional sources. Such β-glucosidases have potential for encouraging white biotechnology.
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14
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A novel β-glucosidase from a hot-spring metagenome shows elevated thermal stability and tolerance to glucose and ethanol. Enzyme Microb Technol 2021; 145:109764. [PMID: 33750538 DOI: 10.1016/j.enzmictec.2021.109764] [Citation(s) in RCA: 13] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/20/2020] [Revised: 01/21/2021] [Accepted: 01/28/2021] [Indexed: 12/22/2022]
Abstract
β-glucosidase causes hydrolysis of β-1,4-glycosidic bond in glycosides and oligosaccharides. It is an industrially important enzyme owing to its potential in biomass processing applications. In this study, computational screening of an extreme temperature aquatic habitat metagenomic resource was done, leading to the identification of a novel gene, bglM, encoding a β-glucosidase. The comparative protein sequence and homology structure analyses designated it as a GH1 family β-glucosidase. The bglM gene was expressed in a heterologous host, Escherichia coli. The purified protein, BglM, was biochemically characterized for β-glucosidase activity. BglM exhibited noteworthy hydrolytic potential towards cellobiose and lactose. BglM, showed substantial catalytic activity in the pH range of 5.0-7.0 and at the temperature 40 °C-70 °C. The enzyme was found quite stable at 50 °C with a loss of hardly 20% after 40 h of heat exposure. Furthermore, any drastically negative effect was not observed on the enzyme's activity in the presence of metal ions, non-ionic surfactants, metal chelating, and denaturing agents. A significantly high glucose tolerance, retaining 80% relative activity at 1 M, and 40% at 5 M glucose, and ethanol tolerance, exhibiting 80% relative activity in 10% ethanol, enrolled BglM as a promising enzyme for cellulose saccharification. Furthermore, its ability to catalyze the hydrolysis of daidzin and polydatin ascertained it as an admirably suited biocatalyst for enhancement of nutritional values in soya and wine industries.
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15
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Borne R, Vita N, Franche N, Tardif C, Perret S, Fierobe HP. Engineering of a new Escherichia coli strain efficiently metabolizing cellobiose with promising perspectives for plant biomass-based application design. Metab Eng Commun 2021; 12:e00157. [PMID: 33457204 PMCID: PMC7797564 DOI: 10.1016/j.mec.2020.e00157] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/17/2020] [Revised: 11/24/2020] [Accepted: 12/14/2020] [Indexed: 11/30/2022] Open
Abstract
The necessity to decrease our fossil energy dependence requests bioprocesses based on biomass degradation. Cellobiose is the main product released by cellulases when acting on the major plant cell wall polysaccharide constituent, the cellulose. Escherichia coli, one of the most common model organisms for the academy and the industry, is unable to metabolize this disaccharide. In this context, the remodeling of E. coli to catabolize cellobiose should thus constitute an important progress for the design of such applications. Here, we developed a robust E. coli strain able to metabolize cellobiose by integration of a small set of modifications in its genome. Contrary to previous studies that use adaptative evolution to achieve some growth on this sugar by reactivating E. coli cryptic operons coding for cellobiose metabolism, we identified easily insertable modifications impacting the cellobiose import (expression of a gene coding a truncated variant of the maltoporin LamB, modification of the expression of lacY encoding the lactose permease) and its intracellular degradation (genomic insertion of a gene encoding either a cytosolic β-glucosidase or a cellobiose phosphorylase). Taken together, our results provide an easily transferable set of mutations that confers to E. coli an efficient growth phenotype on cellobiose (doubling time of 2.2 h in aerobiosis) without any prior adaptation. Production of a cytosolic β-glucosidase or cellobiose phosphorylase allows E. coli to metabolize cellobiose. Optimization of cellobiose uptake through E. coli enveloppe to sustain an efficient growth on this carbon source. Genetic engineering of E. coli can provide the capacity of an efficient cellobiose catabolism.
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Affiliation(s)
- Romain Borne
- Aix-Marseille Université, CNRS, UMR7283, 31 ch. Joseph Aiguier, F-13402, Marseille, France
| | - Nicolas Vita
- Aix-Marseille Université, CNRS, UMR7283, 31 ch. Joseph Aiguier, F-13402, Marseille, France
| | - Nathalie Franche
- Aix-Marseille Université, CNRS, UMR7283, 31 ch. Joseph Aiguier, F-13402, Marseille, France
| | - Chantal Tardif
- Aix-Marseille Université, CNRS, UMR7283, 31 ch. Joseph Aiguier, F-13402, Marseille, France
| | - Stéphanie Perret
- Aix-Marseille Université, CNRS, UMR7283, 31 ch. Joseph Aiguier, F-13402, Marseille, France
| | - Henri-Pierre Fierobe
- Aix-Marseille Université, CNRS, UMR7283, 31 ch. Joseph Aiguier, F-13402, Marseille, France
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16
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Chamoli S, Yadav E, Hemansi, Saini JK, Verma AK, Navani NK, Kumar P. Magnetically recyclable catalytic nanoparticles grafted with Bacillus subtilis β-glucosidase for efficient cellobiose hydrolysis. Int J Biol Macromol 2020; 164:S0141-8130(20)34190-8. [PMID: 32800958 DOI: 10.1016/j.ijbiomac.2020.08.102] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/04/2020] [Revised: 08/02/2020] [Accepted: 08/11/2020] [Indexed: 12/12/2022]
Abstract
This study reports covalent immobilization of β-glucosidase (BGL) from Bacillus subtilis PS on magnetically recyclable iron nanoparticles for enhancing robustness, facile recovery and reuse of enzyme. Immobilized BGL iron nanoparticles (BGL-INPs) were characterized by various biophysical techniques viz. TEM, DLS, FTIR and CD spectroscopy. The efficiency and yield of immobilization were 89.78 and 84.80%, respectively. After immobilization, optimum pH remained 6.0 whereas optimum temperature upraised to 70 °C whereas apparent Km and Vmax shifted from 0.819 mM to 0.941 mM and 54.46 to 57.67 μmole/min/mg, respectively. Immobilization conferred lower activation energy and improved pH and thermal stabilities. The BGL-INPs retained 85% activity up to 10th cycle of reuse and hydrolyzed more than 90% of cellobiose to glucose within 30 min. Conclusively, improved pH, thermal stability and excellent reusability over free enzyme make BGL-INPs a promising candidate for sustainable bioethanol production and other industrial applications.
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Affiliation(s)
- Shivangi Chamoli
- Department of Biochemistry, C.B.S.H., Govind Ballabh Pant University of Agriculture and Technology Pantnagar, Uttarakhand, 263145, India; Deen Dayal Upadhyay Kaushal Kendra, Central University of Haryana, Mahendergarh, Haryana 123031, India
| | - Ekta Yadav
- Department of Biochemistry, Central University of Haryana, Mahendergarh, Haryana 123031, India
| | - Hemansi
- Department of Microbiology, Central University of Haryana, Mahendergarh, Haryana 123031, India
| | - Jitendera Kumar Saini
- Department of Microbiology, Central University of Haryana, Mahendergarh, Haryana 123031, India
| | - Ashok Kumar Verma
- Department of Biochemistry, C.B.S.H., Govind Ballabh Pant University of Agriculture and Technology Pantnagar, Uttarakhand, 263145, India
| | - Naveen Kumar Navani
- Department of Biotechnology, Indian Institute of Technology Roorkee, Roorkee, Uttarakhand 247667, India
| | - Piyush Kumar
- Department of Biochemistry, Central University of Haryana, Mahendergarh, Haryana 123031, India; Department of Biotechnology, Indian Institute of Technology Roorkee, Roorkee, Uttarakhand 247667, India.
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17
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Ariaeenejad S, Nooshi-Nedamani S, Rahban M, Kavousi K, Pirbalooti AG, Mirghaderi S, Mohammadi M, Mirzaei M, Salekdeh GH. A Novel High Glucose-Tolerant β-Glucosidase: Targeted Computational Approach for Metagenomic Screening. Front Bioeng Biotechnol 2020; 8:813. [PMID: 32850705 PMCID: PMC7406677 DOI: 10.3389/fbioe.2020.00813] [Citation(s) in RCA: 28] [Impact Index Per Article: 7.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/03/2020] [Accepted: 06/24/2020] [Indexed: 11/24/2022] Open
Abstract
The rate-limiting component of cellulase for efficient degradation of lignocellulosic biomass through the enzymatic route depends on glucosidase’s sensitivity to the end product (glucose). Therefore, there is still a keen interest in finding glucose-tolerant β-glucosidase (BGL) that is active at high glucose concentrations. The main objective of this study was to identify, isolate, and characterize novel highly glucose-tolerant and halotolerant β-glucosidase gene (PersiBGL1) from the mixed genome DNA of sheep rumen metagenome as a suitable environment for efficient cellulase by computationally guided experiments instead of costly functional screening. At first, an in silico screening approach was utilized to find primary candidate enzymes with superior properties. The structure-dependent mechanism of glucose tolerance was investigated for candidate enzymes. Among the computationally selected candidates, PersiBGL1 was cloned, isolated, and structurally characterized, which achieved very high activity in relatively high temperatures and alkaline pH and was successfully used for the hydrolysis of cellobiose. This enzyme exhibits a very high glucose tolerance, with the highest inhibition constant Ki (8.8 M) among BGLs reported so far and retained 75% of its initial activity in the presence of 10 M glucose. Furthermore, a group of multivalent metal, including Mg2+, Mn2+, and Ca2+, as a cofactor, could improve the catalytic efficiency of PersiBGL1. Our results demonstrated the power of computational selected candidates to discover novel glucose tolerance BGL, effective for the bioconversion of lignocellulosic biomass.
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Affiliation(s)
- Shohreh Ariaeenejad
- Department of Systems and Synthetic Biology, Agricultural Biotechnology Research Institute of Iran (ABRII), Agricultural Research Education and Extension Organization (AREEO), Karaj, Iran
| | - Safura Nooshi-Nedamani
- Department of Systems and Synthetic Biology, Agricultural Biotechnology Research Institute of Iran (ABRII), Agricultural Research Education and Extension Organization (AREEO), Karaj, Iran
| | - Mahdie Rahban
- Laboratory of Complex Biological Systems and Bioinformatics (CBB), Department of Bioinformatics, Institute of Biochemistry and Biophysics (IBB), University of Tehran, Tehran, Iran
| | - Kaveh Kavousi
- Laboratory of Complex Biological Systems and Bioinformatics (CBB), Department of Bioinformatics, Institute of Biochemistry and Biophysics (IBB), University of Tehran, Tehran, Iran
| | - Atefeh Ghasemi Pirbalooti
- Department of Systems and Synthetic Biology, Agricultural Biotechnology Research Institute of Iran (ABRII), Agricultural Research Education and Extension Organization (AREEO), Karaj, Iran
| | - SeyedSoheil Mirghaderi
- Laboratory of Complex Biological Systems and Bioinformatics (CBB), Department of Bioinformatics, Institute of Biochemistry and Biophysics (IBB), University of Tehran, Tehran, Iran
| | - Mahsa Mohammadi
- Department of Systems and Synthetic Biology, Agricultural Biotechnology Research Institute of Iran (ABRII), Agricultural Research Education and Extension Organization (AREEO), Karaj, Iran
| | - Mehdi Mirzaei
- Department of Molecular Sciences, Macquarie University, Sydney, NSW, Australia
| | - Ghasem Hosseini Salekdeh
- Department of Systems and Synthetic Biology, Agricultural Biotechnology Research Institute of Iran (ABRII), Agricultural Research Education and Extension Organization (AREEO), Karaj, Iran.,Department of Molecular Sciences, Macquarie University, Sydney, NSW, Australia
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18
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Rhizosphere Soil Microbial Properties on Tetraena mongolica in the Arid and Semi-Arid Regions, China. INTERNATIONAL JOURNAL OF ENVIRONMENTAL RESEARCH AND PUBLIC HEALTH 2020; 17:ijerph17145142. [PMID: 32708726 PMCID: PMC7400279 DOI: 10.3390/ijerph17145142] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 06/26/2020] [Revised: 07/10/2020] [Accepted: 07/13/2020] [Indexed: 12/02/2022]
Abstract
Tetraena mongolica is a rare and endangered species unique to China. The total number and density of Tetraena mongolica shrubs in desertification areas have experienced a sharp decrease with increases in coal mining activities. However, available information on the T. mongolica rhizosphere soil quality and microbial properties is scarce. Here, we investigated the effect of coal mining on the soil bacterial community and its response to the soil environment in the T. mongolica region. The results showed that the closer to the coal mining area, the lower the vegetation coverage and species diversity. The electrical conductivity (EC) in the contaminated area increased, while the total nitrogen (TN), available phosphorus (AP), available potassium (AK), and soil organic carbon (SOC) decreased. The activity of NAG, sucrose, β-glucosidase, and alkaline phosphatase further decreased. In addition, the mining area could alter the soil’s bacterial abundance and diversity. The organic pollutant degradation bacteria such as Sphingomonas, Gemmatimonas, Nocardioides, and Gaiella were enriched in the soil, and the carbon-nitrogen cycle was changed. Canonical correspondence analysis (CCA) and Pearson’s correlation coefficients showed that the change in the bacterial community structure was mainly caused by environmental factors such as water content (SWC) and EC. Taken together, these results suggested that open pit mining led to the salinization of the soil, reduction the soil nutrient content and enzyme activity, shifting the rhizosphere soil microbial community structure, and altering the carbon-nitrogen cycle, and the soil quality declined and the growth of T. mongolica was affected in the end. Therefore, the development of green coal mining technology is of great significance to protect the growth of T. mongolica.
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19
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Sun J, Wang W, Ying Y, Hao J. A Novel Glucose-Tolerant GH1 β-Glucosidase and Improvement of Its Glucose Tolerance Using Site-Directed Mutation. Appl Biochem Biotechnol 2020; 192:999-1015. [PMID: 32621133 DOI: 10.1007/s12010-020-03373-z] [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: 03/16/2020] [Accepted: 06/22/2020] [Indexed: 12/25/2022]
Abstract
A novel GH1 β-glucosidase gene (bgla) from marine bacterium was sequenced and expressed in Escherichia coli. After purification by Ni2+ affinity chromatography, the recombinant protein was characterized. The purified recombinant enzyme showed maximum activity at 40 °C, pH 7.5 and was stable between temperatures that range from 4 to 30 °C and over the pH range of 6-10. The enzyme displayed a high tolerance to glucose and maximum stimulation at the presence of 100 mM glucose. To improve glucose tolerance of the enzyme, a site-directed mutation (f171w) was introduced into β-glucosidase. The recombinant F171W showed a higher glucose tolerance than the wild type and maintained more than 40% residual activity at the presence of 4 M glucose. Additionally, the recombinant enzymes showed notable tolerance to ethanol. These properties suggest the enzymes may have potential applications for the fermentation of lignocellulosic sugars and the production of biofuels.
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Affiliation(s)
- Jingjing Sun
- Key Laboratory of Sustainable Development of Polar Fishery, Ministry of Agriculture and Rural Affairs, Yellow Sea Fisheries Research Institute, Chinese Academy of Fishery Sciences, Qingdao, 266071, China. .,Laboratory for Marine Drugs and Bioproducts, Qingdao National Laboratory for Marine Science and Technology, Qingdao, 266071, China.
| | - Wei Wang
- Key Laboratory of Sustainable Development of Polar Fishery, Ministry of Agriculture and Rural Affairs, Yellow Sea Fisheries Research Institute, Chinese Academy of Fishery Sciences, Qingdao, 266071, China.,Laboratory for Marine Drugs and Bioproducts, Qingdao National Laboratory for Marine Science and Technology, Qingdao, 266071, China
| | - Yu Ying
- Qingdao Institute for Food and Drug Control, Qingdao, 266071, China
| | - Jianhua Hao
- Key Laboratory of Sustainable Development of Polar Fishery, Ministry of Agriculture and Rural Affairs, Yellow Sea Fisheries Research Institute, Chinese Academy of Fishery Sciences, Qingdao, 266071, China. .,Laboratory for Marine Drugs and Bioproducts, Qingdao National Laboratory for Marine Science and Technology, Qingdao, 266071, China. .,Jiangsu Collaborative Innovation Center for Exploitation and Utilization of Marine Biological Resource, Lianyungang, 222005, China.
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20
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Kim DY, Kim J, Lee SH, Chung C, Shin DH, Ku BH, Son KH, Park HY. A d-glucose- and d-xylose-tolerant GH1 β-glucosidase from Cellulosimicrobium funkei HY-13, a fibrolytic gut bacterium of Eisenia fetida. Process Biochem 2020. [DOI: 10.1016/j.procbio.2020.04.033] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 01/22/2023]
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21
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Mariano D, Pantuza N, Santos LH, Rocha REO, de Lima LHF, Bleicher L, de Melo-Minardi RC. Glutantβase: a database for improving the rational design of glucose-tolerant β-glucosidases. BMC Mol Cell Biol 2020; 21:50. [PMID: 32611314 PMCID: PMC7329481 DOI: 10.1186/s12860-020-00293-y] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/16/2019] [Accepted: 06/22/2020] [Indexed: 11/22/2022] Open
Abstract
Β-glucosidases are key enzymes used in second-generation biofuel production. They act in the last step of the lignocellulose saccharification, converting cellobiose in glucose. However, most of the β-glucosidases are inhibited by high glucose concentrations, which turns it a limiting step for industrial production. Thus, β-glucosidases have been targeted by several studies aiming to understand the mechanism of glucose tolerance, pH and thermal resistance for constructing more efficient enzymes. In this paper, we present a database of β-glucosidase structures, called Glutantβase. Our database includes 3842 GH1 β-glucosidase sequences collected from UniProt. We modeled the sequences by comparison and predicted important features in the 3D-structure of each enzyme. Glutantβase provides information about catalytic and conserved amino acids, residues of the coevolution network, protein secondary structure, and residues located in the channel that guides to the active site. We also analyzed the impact of beneficial mutations reported in the literature, predicted in analogous positions, for similar enzymes. We suggested these mutations based on six previously described mutants that showed high catalytic activity, glucose tolerance, or thermostability (A404V, E96K, H184F, H228T, L441F, and V174C). Then, we used molecular docking to verify the impact of the suggested mutations in the affinity of protein and ligands (substrate and product). Our results suggest that only mutations based on the H228T mutant can reduce the affinity for glucose (product) and increase affinity for cellobiose (substrate), which indicates an increment in the resistance to product inhibition and agrees with computational and experimental results previously reported in the literature. More resistant β-glucosidases are essential to saccharification in industrial applications. However, thermostable and glucose-tolerant β-glucosidases are rare, and their glucose tolerance mechanisms appear to be related to multiple and complex factors. We gather here, a set of information, and made predictions aiming to provide a tool for supporting the rational design of more efficient β-glucosidases. We hope that Glutantβase can help improve second-generation biofuel production. Glutantβase is available at http://bioinfo.dcc.ufmg.br/glutantbase .
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Affiliation(s)
- Diego Mariano
- Laboratory of Bioinformatics and Systems. Department of Computer Science, Universidade Federal de Minas Gerais, Belo Horizonte, 31270-901, Brazil.
| | - Naiara Pantuza
- Laboratory of Bioinformatics and Systems. Department of Computer Science, Universidade Federal de Minas Gerais, Belo Horizonte, 31270-901, Brazil
| | - Lucianna H Santos
- Laboratory of Bioinformatics and Systems. Department of Computer Science, Universidade Federal de Minas Gerais, Belo Horizonte, 31270-901, Brazil
| | - Rafael E O Rocha
- Laboratory of Bioinformatics and Systems. Department of Computer Science, Universidade Federal de Minas Gerais, Belo Horizonte, 31270-901, Brazil
| | - Leonardo H F de Lima
- Laboratory of Molecular Modelling and Bioinformatics (LAMMB), Department of Physical and Biological Sciences, Universidade Federal de São João Del-Rei, Campus Sete Lagoas, Sete Lagoas, 35701-970, Brazil
| | - Lucas Bleicher
- Protein Computational Biology Laboratory, Department of Biochemistry and Immunology, Universidade Federal de Minas Gerais, Belo Horizonte, 31270-901, Brazil
| | - Raquel Cardoso de Melo-Minardi
- Laboratory of Bioinformatics and Systems. Department of Computer Science, Universidade Federal de Minas Gerais, Belo Horizonte, 31270-901, Brazil.
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22
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Dadwal A, Sharma S, Satyanarayana T. Progress in Ameliorating Beneficial Characteristics of Microbial Cellulases by Genetic Engineering Approaches for Cellulose Saccharification. Front Microbiol 2020; 11:1387. [PMID: 32670240 PMCID: PMC7327088 DOI: 10.3389/fmicb.2020.01387] [Citation(s) in RCA: 24] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/15/2020] [Accepted: 05/29/2020] [Indexed: 12/15/2022] Open
Abstract
Lignocellulosic biomass is a renewable and sustainable energy source. Cellulases are the enzymes that cleave β-1, 4-glycosidic linkages in cellulose to liberate sugars that can be fermented to ethanol, butanol, and other products. Low enzyme activity and yield, and thermostability are, however, some of the limitations posing hurdles in saccharification of lignocellulosic residues. Recent advancements in synthetic and systems biology have generated immense interest in metabolic and genetic engineering that has led to the development of sustainable technology for saccharification of lignocellulosics in the last couple of decades. There have been several attempts in applying genetic engineering in the production of a repertoire of cellulases at a low cost with a high biomass saccharification. A diverse range of cellulases are produced by different microbes, some of which are being engineered to evolve robust cellulases. This review summarizes various successful genetic engineering strategies employed for improving cellulase kinetics and cellulolytic efficiency.
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Affiliation(s)
- Anica Dadwal
- Department of Biological Sciences and Engineering, Netaji Subhas University of Technology, New Delhi, India
| | - Shilpa Sharma
- Department of Biological Sciences and Engineering, Netaji Subhas University of Technology, New Delhi, India
| | - Tulasi Satyanarayana
- Department of Biological Sciences and Engineering, Netaji Subhas University of Technology, New Delhi, India
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Méndez-Líter JA, Nieto-Domínguez M, Fernández de Toro B, González Santana A, Prieto A, Asensio JL, Cañada FJ, de Eugenio LI, Martínez MJ. A glucotolerant β-glucosidase from the fungus Talaromyces amestolkiae and its conversion into a glycosynthase for glycosylation of phenolic compounds. Microb Cell Fact 2020; 19:127. [PMID: 32522206 PMCID: PMC7288487 DOI: 10.1186/s12934-020-01386-1] [Citation(s) in RCA: 14] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/15/2019] [Accepted: 06/04/2020] [Indexed: 12/23/2022] Open
Abstract
Background The interest for finding novel β-glucosidases that can improve the yields to produce second-generation (2G) biofuels is still very high. One of the most desired features for these enzymes is glucose tolerance, which enables their optimal activity under high-glucose concentrations. Besides, there is an additional focus of attention on finding novel enzymatic alternatives for glycoside synthesis, for which a mutated version of glycosidases, named glycosynthases, has gained much interest in recent years. Results In this work, a glucotolerant β-glucosidase (BGL-1) from the ascomycete fungus Talaromyces amestolkiae has been heterologously expressed in Pichia pastoris, purified, and characterized. The enzyme showed good efficiency on p-nitrophenyl glucopyranoside (pNPG) (Km= 3.36 ± 0.7 mM, kcat= 898.31 s−1), but its activity on cellooligosaccharides, the natural substrates of these enzymes, was much lower, which could limit its exploitation in lignocellulose degradation applications. Interestingly, when examining the substrate specificity of BGL-1, it showed to be more active on sophorose, the β-1,2 disaccharide of glucose, than on cellobiose. Besides, the transglycosylation profile of BGL-1 was examined, and, for expanding its synthetic capacities, it was converted into a glycosynthase. The mutant enzyme, named BGL-1-E521G, was able to use α-d-glucosyl-fluoride as donor in glycosylation reactions, and synthesized glucosylated derivatives of different pNP-sugars in a regioselective manner, as well as of some phenolic compounds of industrial interest, such as epigallocatechin gallate (EGCG). Conclusions In this work, we report the characterization of a novel glucotolerant 1,2-β-glucosidase, which also has a considerable activity on 1,4-β-glucosyl bonds, that has been cloned in P. pastoris, produced, purified and characterized. In addition, the enzyme was converted into an efficient glycosynthase, able to transfer glucose molecules to a diversity of acceptors for obtaining compounds of interest. The remarkable capacities of BGL-1 and its glycosynthase mutant, both in hydrolysis and synthesis, suggest that it could be an interesting tool for biotechnological applications.
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Affiliation(s)
- Juan Antonio Méndez-Líter
- Department of Microbial and Plant Biotechnology, Centro de Investigaciones Biológicas, CSIC, Ramiro de Maeztu 9, 28040, Madrid, Spain
| | - Manuel Nieto-Domínguez
- Department of Microbial and Plant Biotechnology, Centro de Investigaciones Biológicas, CSIC, Ramiro de Maeztu 9, 28040, Madrid, Spain
| | - Beatriz Fernández de Toro
- Department of Chemical and Physical Biology, Centro de Investigaciones Biológicas, CSIC, Ramiro de Maeztu 9, 28040, Madrid, Spain
| | - Andrés González Santana
- Glycochemistry and Molecular Recognition Group, Instituto de Química Orgánica General (IQOG-CSIC), Calle Juan de la Cierva, 3, 28006, Madrid, Spain
| | - Alicia Prieto
- Department of Microbial and Plant Biotechnology, Centro de Investigaciones Biológicas, CSIC, Ramiro de Maeztu 9, 28040, Madrid, Spain
| | - Juan Luis Asensio
- Glycochemistry and Molecular Recognition Group, Instituto de Química Orgánica General (IQOG-CSIC), Calle Juan de la Cierva, 3, 28006, Madrid, Spain
| | - Francisco Javier Cañada
- Department of Chemical and Physical Biology, Centro de Investigaciones Biológicas, CSIC, Ramiro de Maeztu 9, 28040, Madrid, Spain
| | - Laura Isabel de Eugenio
- Department of Microbial and Plant Biotechnology, Centro de Investigaciones Biológicas, CSIC, Ramiro de Maeztu 9, 28040, Madrid, Spain
| | - María Jesús Martínez
- Department of Microbial and Plant Biotechnology, Centro de Investigaciones Biológicas, CSIC, Ramiro de Maeztu 9, 28040, Madrid, Spain.
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24
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Yang H, Cai G, Lu J, Gómez Plaza E. The production and application of enzymes related to the quality of fruit wine. Crit Rev Food Sci Nutr 2020; 61:1605-1615. [PMID: 32423236 DOI: 10.1080/10408398.2020.1763251] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/22/2023]
Abstract
Grape wine is the most widely consumed fruit wine in the world. With the increasing diversification of consumers' needs, the variety of fruit wines in the market is becoming more and more abundant. Whether it is the production of grape wine or other fruit wines these processes are inseparable from the participation of enzymes. The quality of these wines is closely related to the application of enzymes in the winemaking process. Enzymes are involved in pretreatment, fermentation, filtration, flavoring, aging and storage of fruit wines. This review systematically illustrated the role of pectinase, β-glucanase, β-glucosidase, glucose oxidase, lysozyme, protease, tannase and urease in the production of wines and their current production status and also provided a theoretical basis for better application of various enzymes in the production of various fruit wines. This knowledge could be great significance to improve the quality of fruit wines and reduce the production costs in the fruit wine industry.
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Affiliation(s)
- Hua Yang
- The Key Laboratory of Industrial Biotechnology, Ministry of Education, School of Biotechnology, Jiangnan University, Wuxi, China.,National Engineering Laboratory for Cereal Fermentation Technology, Jiangnan University, Wuxi, P. R. China.,Jiangsu Provincial Research Center for Bioactive Product Processing Technology, Wuxi, P. R. China.,School of Biotechnology, Jiangnan University, Wuxi, P. R. China.,School of Food Science and Technology, University of Murcia, Murcia, Spain
| | - Guolin Cai
- The Key Laboratory of Industrial Biotechnology, Ministry of Education, School of Biotechnology, Jiangnan University, Wuxi, China.,National Engineering Laboratory for Cereal Fermentation Technology, Jiangnan University, Wuxi, P. R. China.,Jiangsu Provincial Research Center for Bioactive Product Processing Technology, Wuxi, P. R. China.,School of Biotechnology, Jiangnan University, Wuxi, P. R. China
| | - Jian Lu
- The Key Laboratory of Industrial Biotechnology, Ministry of Education, School of Biotechnology, Jiangnan University, Wuxi, China.,National Engineering Laboratory for Cereal Fermentation Technology, Jiangnan University, Wuxi, P. R. China.,Jiangsu Provincial Research Center for Bioactive Product Processing Technology, Wuxi, P. R. China.,School of Biotechnology, Jiangnan University, Wuxi, P. R. China
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25
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In silico Approach to Elucidate Factors Associated with GH1 β-Glucosidase Thermostability. JOURNAL OF PURE AND APPLIED MICROBIOLOGY 2019. [DOI: 10.22207/jpam.13.4.07] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022] Open
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26
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Zhang L, Shen Y, Lu W, Guo L, Xiang M, Zhang D. Preparation and Characterization of β-glucosidase Films for Stabilization and Handling in Dry Configurations. Curr Pharm Biotechnol 2019; 21:741-747. [PMID: 31793420 DOI: 10.2174/1389201020666191202145351] [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: 07/26/2019] [Revised: 11/05/2019] [Accepted: 11/13/2019] [Indexed: 11/22/2022]
Abstract
BACKGROUND Although the stability of proteins is of significance to maintain protein function for therapeutical applications, this remains a challenge. Herein, a general method of preserving protein stability and function was developed using gelatin films. METHODS Enzymes immobilized onto films composed of gelatin and Ethylene Glycol (EG) were developed to study their ability to stabilize proteins. As a model functional protein, β-glucosidase was selected. The tensile properties, microstructure, and crystallization behavior of the gelatin films were assessed. RESULTS Our results indicated that film configurations can preserve the activity of β-glucosidase under rigorous conditions (75% relative humidity and 37°C for 47 days). In both control films and films containing 1.8 % β-glucosidase, tensile strength increased with increased EG content, whilst the elongation at break increased initially, then decreased over time. The presence of β-glucosidase had a negligible influence on tensile strength and elongation at break. Scanning electron-microscopy (SEM) revealed that with increasing EG content or decreasing enzyme concentrations, a denser microstructure was observed. CONCLUSION In conclusion, the dry film is a promising candidate to maintain protein stabilization and handling. The configuration is convenient and cheap, and thus applicable to protein storage and transportation processes in the future.
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Affiliation(s)
- Liguang Zhang
- College of Pharmacy, Suzhou Vocational Health College, Suzhou, China
| | - Yanan Shen
- School of Pharmacy, Xuzhou Medicinal University, Xuzhou, China
| | - Wenjing Lu
- College of Pharmacy, Suzhou Vocational Health College, Suzhou, China
| | - Lengqiu Guo
- College of Pharmacy, Suzhou Vocational Health College, Suzhou, China
| | - Min Xiang
- College of Pharmacy, Suzhou Vocational Health College, Suzhou, China
| | - Dayong Zhang
- State Key Laboratory of Crop Genetics & Germplasm Enhancement, Nanjing Agricultural University, Nanjing, China
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27
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Molecular Dynamics Gives New Insights into the Glucose Tolerance and Inhibition Mechanisms on β-Glucosidases. Molecules 2019; 24:molecules24183215. [PMID: 31487855 PMCID: PMC6766793 DOI: 10.3390/molecules24183215] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/29/2019] [Revised: 08/15/2019] [Accepted: 08/23/2019] [Indexed: 12/23/2022] Open
Abstract
β-Glucosidases are enzymes with high importance for many industrial processes, catalyzing the last and limiting step of the conversion of lignocellulosic material into fermentable sugars for biofuel production. However, β-glucosidases are inhibited by high concentrations of the product (glucose), which limits the biofuel production on an industrial scale. For this reason, the structural mechanisms of tolerance to product inhibition have been the target of several studies. In this study, we performed in silico experiments, such as molecular dynamics (MD) simulations, free energy landscape (FEL) estimate, Poisson-Boltzmann surface area (PBSA), and grid inhomogeneous solvation theory (GIST) seeking a better understanding of the glucose tolerance and inhibition mechanisms of a representative GH1 β-glucosidase and a GH3 one. Our results suggest that the hydrophobic residues Y180, W350, and F349, as well the polar one D238 act in a mechanism for glucose releasing, herein called "slingshot mechanism", dependent also on an allosteric channel (AC). In addition, water activity modulation and the protein loop motions suggest that GH1 β-Glucosidases present an active site more adapted to glucose withdrawal than GH3, in consonance with the GH1s lower product inhibition. The results presented here provide directions on the understanding of the molecular mechanisms governing inhibition and tolerance to the product in β-glucosidases and can be useful for the rational design of optimized enzymes for industrial interests.
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28
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Liu X, Cao L, Zeng J, Liu Y, Xie W. Improving the cellobiose-hydrolysis activity and glucose-tolerance of a thermostable β-glucosidase through rational design. Int J Biol Macromol 2019; 136:1052-1059. [DOI: 10.1016/j.ijbiomac.2019.06.029] [Citation(s) in RCA: 15] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/05/2019] [Revised: 05/01/2019] [Accepted: 06/05/2019] [Indexed: 12/20/2022]
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29
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Sharma K, Thakur A, Kumar R, Goyal A. Structure and biochemical characterization of glucose tolerant β-1,4 glucosidase (HtBgl) of family 1 glycoside hydrolase from Hungateiclostridium thermocellum. Carbohydr Res 2019; 483:107750. [PMID: 31357130 DOI: 10.1016/j.carres.2019.107750] [Citation(s) in RCA: 12] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/06/2019] [Revised: 06/14/2019] [Accepted: 07/16/2019] [Indexed: 12/15/2022]
Abstract
β-1,4-glucosidase (HtBgl) of family 1 glycoside hydrolase from Hungateiclostridium thermocellum was cloned in pET28a(+) vector, expressed, biochemically and structurally characterized. HtBgl displayed 67 U/mg activity against 4-nitrophenyl-β-d-glucopyranoside, followed by 180 U/mg against cellobiose and 42 U/mg activity against 4-nitrophenyl-β-d-galactopyranoside. HtBgl displayed an optimum temperature of 65 °C and an optimum pH of 6.0. HtBgl was stable in the pH range, 4.0-8.0 and displayed the thermostability up to 60 °C for 1 h. HtBgl displayed the glucose tolerance up to 750 mM and retained ~70% activity after 20 h. HtBgl crystal structure submitted (PDB id 5OGZ) by others exhibited a classical Triosephosphate Isomerase, (β/α)8-barrel fold. Protein melting analysis of HtBgl exhibited a single peak at 78 °C and the addition of 5 mM Mg2+ shifted the peak to 82 °C. Molecular dynamics studies showed that the amino acid residues from 351 to 375 exhibit the flexibility due to the presence of the catalytic acid residue. The structure comparison of HtBgl with homologous proteins and its docking analysis with probable ligands revealed that the residues, E166 and E355 are involved in the catalysis. The SAXS analysis of HtBgl showed that the protein is monomeric and present in a fully folded state. The radius of gyration (Rg) found was 2.15-2.26 nm. The bell-shaped curve obtained by Kratky plot analysis displayed the globular shape and fully folded state with flexibility in the N-terminal region. The HtBgl crystal structure superposed well with the SAXS derived dummy atom model.
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Affiliation(s)
- Kedar Sharma
- DBT PAN-IIT Centre of Bioenergy, Carbohydrate Enzyme Biotechnology Laboratory, Department of Biosciences and Bioengineering, Indian Institute of Technology Guwahati, Guwahati, 781039, Assam, India
| | - Abhijeet Thakur
- DBT PAN-IIT Centre of Bioenergy, Carbohydrate Enzyme Biotechnology Laboratory, Department of Biosciences and Bioengineering, Indian Institute of Technology Guwahati, Guwahati, 781039, Assam, India
| | - Rajeev Kumar
- DBT PAN-IIT Centre of Bioenergy, Carbohydrate Enzyme Biotechnology Laboratory, Department of Biosciences and Bioengineering, Indian Institute of Technology Guwahati, Guwahati, 781039, Assam, India
| | - Arun Goyal
- DBT PAN-IIT Centre of Bioenergy, Carbohydrate Enzyme Biotechnology Laboratory, Department of Biosciences and Bioengineering, Indian Institute of Technology Guwahati, Guwahati, 781039, Assam, India.
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30
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Yin YR, Sang P, Xian WD, Li X, Jiao JY, Liu L, Hozzein WN, Xiao M, Li WJ. Expression and Characteristics of Two Glucose-Tolerant GH1 β-glucosidases From Actinomadura amylolytica YIM 77502 T for Promoting Cellulose Degradation. Front Microbiol 2018; 9:3149. [PMID: 30619214 PMCID: PMC6305311 DOI: 10.3389/fmicb.2018.03149] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/18/2018] [Accepted: 12/04/2018] [Indexed: 01/25/2023] Open
Abstract
The bioconversion of lignocellulose in various industrial processes, such as biofuel production, requires the degradation of cellulose. Actinomadura amylolytica YIM 77502T is an aerobic, Gram-positive actinomycete that can efficiently degrade crystalline cellulose by extracellular cellulases. Genomic analysis of A. amylolytica identified 9 cellulase and 11 β-glucosidase genes that could potentially encode proteins that digest cellulose. Extracellular proteome characterization of A. amylolytica cell-free culture supernatant by liquid chromatography tandem mass spectrometry analysis revealed that 4 of these cellulases and 2 of these β-glucosidases functioned during cellulose hydrolysis. Thin-layer chromatography analysis revealed extracellular β-glucosidases play a major role in carboxyl methyl cellulose (CMC) degradation of products in culture supernatants. In this study, 2 of the identified secreted β-glucosidases, AaBGL1 and AaBGL2, were functionally expressed in Escherichia coli and found to have β-glucosidase activity with wide substrate specificities, including for p-nitrophenyl β-D-glucopyranoside (pNPG), p-nitrophenyl-beta-D-cellobioside (pNPC), and cellobiose. Moreover, AaBGL1 and AaBGL2 had high tolerances for glucose. After adding these β-glucosidases to commercial cellulases, the degradation rates of CMC, Avicel, birch sawdust, and corncob powder increased by 37, 42, 33, and 9%, respectively. Overall, this work identifies an alternative potential source of β-glucosidases with potential applications in commercial cellulose utilization and the bioenergy industry.
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Affiliation(s)
- Yi-Rui Yin
- State Key Laboratory of Biocontrol and Guangdong Provincial Key Laboratory of Plant Resources, School of Life Sciences, Sun Yat-sen University, Guangzhou, China
| | - Peng Sang
- College of Agriculture and Biological Science, Dali University, Dali, China
| | - Wen-Dong Xian
- State Key Laboratory of Biocontrol and Guangdong Provincial Key Laboratory of Plant Resources, School of Life Sciences, Sun Yat-sen University, Guangzhou, China
| | - Xin Li
- State Key Laboratory of Biocontrol and Guangdong Provincial Key Laboratory of Plant Resources, School of Life Sciences, Sun Yat-sen University, Guangzhou, China
| | - Jian-Yu Jiao
- State Key Laboratory of Biocontrol and Guangdong Provincial Key Laboratory of Plant Resources, School of Life Sciences, Sun Yat-sen University, Guangzhou, China
| | - Lan Liu
- State Key Laboratory of Biocontrol and Guangdong Provincial Key Laboratory of Plant Resources, School of Life Sciences, Sun Yat-sen University, Guangzhou, China
| | - Wael N Hozzein
- Bioproducts Research Chair, Department of Zoology, College of Science, King Saud University, Riyadh, Saudi Arabia.,Department of Botany and Microbiology, Faculty of Science, Beni-Suef University, Beni-Suef, Egypt
| | - Min Xiao
- State Key Laboratory of Biocontrol and Guangdong Provincial Key Laboratory of Plant Resources, School of Life Sciences, Sun Yat-sen University, Guangzhou, China
| | - Wen-Jun Li
- State Key Laboratory of Biocontrol and Guangdong Provincial Key Laboratory of Plant Resources, School of Life Sciences, Sun Yat-sen University, Guangzhou, China.,Key Laboratory of Biogeography and Bioresource in Arid Land, Xinjiang Institute of Ecology and Geography, Chinese Academy of Sciences, Ürümqi, China
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31
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Salgado JCS, Meleiro LP, Carli S, Ward RJ. Glucose tolerant and glucose stimulated β-glucosidases - A review. BIORESOURCE TECHNOLOGY 2018; 267:704-713. [PMID: 30093225 DOI: 10.1016/j.biortech.2018.07.137] [Citation(s) in RCA: 76] [Impact Index Per Article: 12.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/27/2018] [Revised: 07/24/2018] [Accepted: 07/26/2018] [Indexed: 05/22/2023]
Abstract
The β-glucosidases (β-D-glucoside glucohydrolase, EC 3.2.1.21) hydrolyze glycosidic bonds of alkyl-, amino-, or aryl-β-D-glucosides, cyanogenic glucosides, disaccharides and short oligosaccharides and can also catalyze the synthesis of glycosyl-bonds between different molecules via transglycosylation. Due to their ubiquitous phylogenetic distribution, substrate diversity and ability to both hydrolyze and synthesize glycosidic bonds, the catalysis and regulation of β-glucosidases have been extensively studied. Many β-glucosidases are inhibited by the reaction product glucose, and reduced catalytic activity may limit the biotechnological and industrial applications of these enzymes and this has stimulated the search for β-glucosidases that maintain their activity at high glucose concentrations. Studies of many glucose tolerant enzymes have been reported and due to the ongoing interest in these enzymes, here it has been reviewed this accumulated body of knowledge which provides valuable insights as to the kinetics, structure, regulation and evolution of glucose tolerant and glucose stimulated β-glucosidases.
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Affiliation(s)
- José Carlos Santos Salgado
- Departamento de Química, Faculdade de Filosofia, Ciências e Letras de Ribeirão Preto, Universidade de São Paulo, Ribeirão Preto, São Paulo, Brazil
| | - Luana Parras Meleiro
- Departamento de Química, Faculdade de Filosofia, Ciências e Letras de Ribeirão Preto, Universidade de São Paulo, Ribeirão Preto, São Paulo, Brazil.
| | - Sibeli Carli
- Departamento de Química, Faculdade de Filosofia, Ciências e Letras de Ribeirão Preto, Universidade de São Paulo, Ribeirão Preto, São Paulo, Brazil
| | - Richard John Ward
- Departamento de Química, Faculdade de Filosofia, Ciências e Letras de Ribeirão Preto, Universidade de São Paulo, Ribeirão Preto, São Paulo, Brazil
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32
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Sun J, Wang W, Yao C, Dai F, Zhu X, Liu J, Hao J. Overexpression and characterization of a novel cold-adapted and salt-tolerant GH1 β-glucosidase from the marine bacterium Alteromonas sp. L82. J Microbiol 2018; 56:656-664. [PMID: 30141158 DOI: 10.1007/s12275-018-8018-2] [Citation(s) in RCA: 19] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/12/2018] [Revised: 06/21/2018] [Accepted: 06/22/2018] [Indexed: 10/28/2022]
Abstract
A novel gene (bgl) encoding a cold-adapted β-glucosidase was cloned from the marine bacterium Alteromonas sp. L82. Based on sequence analysis and its putative catalytic conserved region, Bgl belonged to the glycoside hydrolase family 1. Bgl was overexpressed in E. coli and purified by Ni2+ affinity chromatography. The purified recombinant β-glucosidase showed maximum activity at temperatures between 25°C to 45°C and over the pH range 6 to 8. The enzyme lost activity quickly after incubation at 40°C. Therefore, recombinant β-glucosidase appears to be a cold-adapted enzyme. The addition of reducing agent doubled its activity and 2 M NaCl did not influence its activity. Recombinant β-glucosidase was also tolerant of 700 mM glucose and some organic solvents. Bgl had a Km of 0.55 mM, a Vmax of 83.6 U/mg, a kcat of 74.3 s-1 and kcat/Km of 135.1 at 40°C, pH 7 with 4-nitrophenyl-β-D-glucopyranoside as a substrate. These properties indicate Bgl may be an interesting candidate for biotechnological and industrial applications.
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Affiliation(s)
- Jingjing Sun
- Key Laboratory of Sustainable Development of Polar Fishery, Ministry of Agriculture, Yellow Sea Fisheries Research Institute, Chinese Academy of Fishery Sciences, Qingdao, 266071, P. R. China.,Laboratory for Marine Drugs and Bioproducts, Laboratory for Marine Fisheries Science and Food Production Processes, Qingdao National Laboratory for Marine Science and Technology, Qingdao, 266071, P. R. China
| | - Wei Wang
- Key Laboratory of Sustainable Development of Polar Fishery, Ministry of Agriculture, Yellow Sea Fisheries Research Institute, Chinese Academy of Fishery Sciences, Qingdao, 266071, P. R. China.,Laboratory for Marine Drugs and Bioproducts, Laboratory for Marine Fisheries Science and Food Production Processes, Qingdao National Laboratory for Marine Science and Technology, Qingdao, 266071, P. R. China
| | - Congyu Yao
- Key Laboratory of Sustainable Development of Polar Fishery, Ministry of Agriculture, Yellow Sea Fisheries Research Institute, Chinese Academy of Fishery Sciences, Qingdao, 266071, P. R. China.,Laboratory for Marine Drugs and Bioproducts, Laboratory for Marine Fisheries Science and Food Production Processes, Qingdao National Laboratory for Marine Science and Technology, Qingdao, 266071, P. R. China.,Shanghai Ocean University, Shanghai, 201306, P. R. China
| | - Fangqun Dai
- Key Laboratory of Sustainable Development of Polar Fishery, Ministry of Agriculture, Yellow Sea Fisheries Research Institute, Chinese Academy of Fishery Sciences, Qingdao, 266071, P. R. China.,Laboratory for Marine Drugs and Bioproducts, Laboratory for Marine Fisheries Science and Food Production Processes, Qingdao National Laboratory for Marine Science and Technology, Qingdao, 266071, P. R. China
| | - Xiangjie Zhu
- Key Laboratory of Sustainable Development of Polar Fishery, Ministry of Agriculture, Yellow Sea Fisheries Research Institute, Chinese Academy of Fishery Sciences, Qingdao, 266071, P. R. China.,Laboratory for Marine Drugs and Bioproducts, Laboratory for Marine Fisheries Science and Food Production Processes, Qingdao National Laboratory for Marine Science and Technology, Qingdao, 266071, P. R. China.,Shanghai Ocean University, Shanghai, 201306, P. R. China
| | - Junzhong Liu
- Key Laboratory of Sustainable Development of Polar Fishery, Ministry of Agriculture, Yellow Sea Fisheries Research Institute, Chinese Academy of Fishery Sciences, Qingdao, 266071, P. R. China.,Laboratory for Marine Drugs and Bioproducts, Laboratory for Marine Fisheries Science and Food Production Processes, Qingdao National Laboratory for Marine Science and Technology, Qingdao, 266071, P. R. China
| | - Jianhua Hao
- Key Laboratory of Sustainable Development of Polar Fishery, Ministry of Agriculture, Yellow Sea Fisheries Research Institute, Chinese Academy of Fishery Sciences, Qingdao, 266071, P. R. China. .,Laboratory for Marine Drugs and Bioproducts, Laboratory for Marine Fisheries Science and Food Production Processes, Qingdao National Laboratory for Marine Science and Technology, Qingdao, 266071, P. R. China. .,Jiangsu Collaborative Innovation Center for Exploitation and Utilization of Marine Biological Resource, Lianyungang, 222005, P. R. China.
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33
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A novel β-glucosidase isolated from the microbial metagenome of Lake Poraquê (Amazon, Brazil). BIOCHIMICA ET BIOPHYSICA ACTA-PROTEINS AND PROTEOMICS 2018; 1866:569-579. [DOI: 10.1016/j.bbapap.2018.02.001] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/19/2017] [Revised: 02/09/2018] [Accepted: 02/14/2018] [Indexed: 11/23/2022]
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34
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Characterization of cold adapted and ethanol tolerant β-glucosidase from Bacillus cellulosilyticus and its application for directed hydrolysis of cellobiose to ethanol. Int J Biol Macromol 2018; 109:872-879. [DOI: 10.1016/j.ijbiomac.2017.11.072] [Citation(s) in RCA: 16] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/18/2017] [Revised: 11/08/2017] [Accepted: 11/10/2017] [Indexed: 01/05/2023]
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35
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Characterization of a Thermophilic Monosaccharide Stimulated β-Glucosidase from Acidothermus cellulolyticus. Chem Res Chin Univ 2018. [DOI: 10.1007/s40242-018-7408-7] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/20/2022]
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36
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Akram F, Haq IU, Mukhtar H. Gene cloning, characterization and thermodynamic analysis of a novel multidomain hyperthermophilic GH family 3 β-glucosidase (TnBglB) from Thermotoga naphthophila RKU-10T. Process Biochem 2018. [DOI: 10.1016/j.procbio.2017.12.007] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 12/23/2022]
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37
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Meleiro LP, Salgado JCS, Maldonado RF, Carli S, Moraes LAB, Ward RJ, Jorge JA, Furriel RPM. Engineering the GH1 β-glucosidase from Humicola insolens: Insights on the stimulation of activity by glucose and xylose. PLoS One 2017; 12:e0188254. [PMID: 29145480 PMCID: PMC5690678 DOI: 10.1371/journal.pone.0188254] [Citation(s) in RCA: 18] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/04/2017] [Accepted: 11/05/2017] [Indexed: 12/31/2022] Open
Abstract
The activity of the GH1 β-glucosidase from Humicola insolens (Bglhi) against p-nitrophenyl-β-D-glucopyranoside (pNP-Glc) and cellobiose is enhanced 2-fold by glucose and/or xylose. Kinetic and transglycosylation data showed that hydrolysis is preferred in the absence of monosaccharides. Stimulation involves allosteric interactions, increased transglycosylation and competition of the substrate and monosaccharides for the -1 glycone and the +1/+2 aglycone binding sites. Protein directed evolution has been used to generate 6 mutants of Bglhi with altered stimulation patterns. All mutants contain one of three substitutions (N235S, D237V or H307Y) clustered around the +1/+2 aglycone binding sites. Two mutants with the H307Y substitution preferentially followed the transglycosylation route in the absence of xylose or glucose. The strong stimulation of their pNP-glucosidase and cellobiase activities was accompanied by increased transglycosylation and higher monosaccharide tolerance. The D237V mutation favoured hydrolysis over transglycosylation and the pNP-glucosidase activity, but not the cellobiase activity, was stimulated by xylose. The substitution N235S abolished the preference for hydrolysis or transglycosylation; the cellobiase, but not the pNP-glucosidase activity of the mutants was strongly inhibited by xylose. Both the D237V and N235S mutations lowered tolerance to the monosaccharides. These results provide evidence that the fine modulation of the activity of Bglhi and mutants by glucose and/or xylose is regulated by the relative affinities of the glycone and aglycone binding sites for the substrate and the free monosaccharides.
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Affiliation(s)
- Luana Parras Meleiro
- Departamento de Química, Faculdade de Filosofia, Ciências e Letras de Ribeirão Preto, Universidade de São Paulo, Ribeirão Preto, São Paulo, Brasil
- * E-mail:
| | - José Carlos Santos Salgado
- Departamento de Bioquímica e Imunologia, Faculdade de Medicina de Ribeirão Preto, Universidade de São Paulo, Ribeirão Preto, São Paulo, Brasil
| | - Raquel Fonseca Maldonado
- Instituto Federal de Educação, Ciência e Tecnologia de São Paulo, São José dos Campos, São Paulo, Brasil
| | - Sibeli Carli
- Departamento de Química, Faculdade de Filosofia, Ciências e Letras de Ribeirão Preto, Universidade de São Paulo, Ribeirão Preto, São Paulo, Brasil
| | - Luiz Alberto Beraldo Moraes
- Departamento de Química, Faculdade de Filosofia, Ciências e Letras de Ribeirão Preto, Universidade de São Paulo, Ribeirão Preto, São Paulo, Brasil
| | - Richard John Ward
- Departamento de Química, Faculdade de Filosofia, Ciências e Letras de Ribeirão Preto, Universidade de São Paulo, Ribeirão Preto, São Paulo, Brasil
| | - João Atílio Jorge
- Departamento de Biologia, Faculdade de Filosofia, Ciências e Letras de Ribeirão Preto, Universidade de São Paulo, Ribeirão Preto, São Paulo, Brasil
| | - Rosa Prazeres Melo Furriel
- Departamento de Química, Faculdade de Filosofia, Ciências e Letras de Ribeirão Preto, Universidade de São Paulo, Ribeirão Preto, São Paulo, Brasil
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Improved thermostability of a metagenomic glucose-tolerant β-glycosidase based on its X-ray crystal structure. Appl Microbiol Biotechnol 2017; 101:8353-8363. [DOI: 10.1007/s00253-017-8525-9] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/15/2017] [Revised: 08/08/2017] [Accepted: 09/07/2017] [Indexed: 12/29/2022]
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39
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Heterologous expression and biochemical studies of a thermostable glucose tolerant β-glucosidase from Methylococcus capsulatus ( bath strain ). Int J Biol Macromol 2017; 102:805-812. [DOI: 10.1016/j.ijbiomac.2017.04.078] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/17/2017] [Revised: 04/20/2017] [Accepted: 04/21/2017] [Indexed: 12/18/2022]
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40
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Goswami S, Das S, Datta S. Understanding the role of residues around the active site tunnel towards generating a glucose-tolerant β-glucosidase from Agrobacterium tumefaciens 5A. Protein Eng Des Sel 2017; 30:523-530. [DOI: 10.1093/protein/gzx039] [Citation(s) in RCA: 20] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/25/2017] [Accepted: 07/10/2017] [Indexed: 12/18/2022] Open
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Yin YR, Meng ZH, Hu QW, Jiang Z, Xian WD, Li LH, Hu W, Zhang F, Zhou EM, Zhi XY, Li WJ. The Hybrid Strategy of Thermoactinospora rubra YIM 77501 T for Utilizing Cellulose as a Carbon Source at Different Temperatures. Front Microbiol 2017; 8:942. [PMID: 28611745 PMCID: PMC5447088 DOI: 10.3389/fmicb.2017.00942] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/01/2017] [Accepted: 05/10/2017] [Indexed: 01/02/2023] Open
Abstract
Thermoactinospora rubra YIM 77501T is an aerobic, Gram-positive, spore-forming and cellulose degrading thermophilic actinomycete isolated from a sandy soil sample of a volcano. Its growth temperature range is 28–60°C. The genomic sequence of this strain revealed that there are 27 cellulase genes belonging to six glycoside hydrolase families. To understand the strategy that this strain uses to utilize carbon sources such as cellulose at different temperatures, comparative transcriptomics analysis of T. rubra YIM 77501T was performed by growing it with cellulose (CMC) and without cellulose (replaced with glucose) at 30, 40, and 50°C, respectively. Transcriptomic analyses showed four cellulase genes (TrBG2, TrBG3, TrBG4, and ThrCel6B) were up-regulated at 30, 40, and 50°C. The rate of gene expression of TrBG2, TrBG3, TrBG4, and ThrCel6B were 50°C > 30°C > 40°C. One cellulase gene (TrBG1) and two cellulase genes (TrBG5 and ThrCel6A) were up-regulated only at 30 and 50°C, respectively. These up-regulated cellulase genes were cloned and expressed in Escherichia coli. The enzymatic properties of up-regulated cellulases showed a variety of responses to temperature. Special up-regulated cellulases TrBG1 and ThrCel6A displayed temperature acclimation for each growth condition. These expression patterns revealed that a hybrid strategy was used by T. rubra to utilize carbon sources at different temperatures. This study provides genomic, transcriptomics, and experimental data useful for understanding how microorganisms respond to environmental changes and their application in enhancing cellulose hydrolysis for animal feed and bioenergy production.
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Affiliation(s)
- Yi-Rui Yin
- School of Life Sciences, Yunnan Institute of Microbiology, Yunnan UniversityKunming, China
| | - Zhao-Hui Meng
- Department of Cardiology, The First Affiliated Hospital of Kunming Medical UniversityKunming, China
| | - Qing-Wen Hu
- School of Life Sciences, Yunnan Institute of Microbiology, Yunnan UniversityKunming, China
| | - Zhao Jiang
- School of Life Sciences, Yunnan Institute of Microbiology, Yunnan UniversityKunming, China
| | - Wen-Dong Xian
- State Key Laboratory of Biocontrol and Guangdong Provincial Key Laboratory of Plant Resources, School of Life Sciences, Sun Yat-Sen UniversityGuangzhou, China
| | - Lin-Hua Li
- Department of Cardiology, The First Affiliated Hospital of Kunming Medical UniversityKunming, China
| | - Wei Hu
- Department of Cardiology, The First Affiliated Hospital of Kunming Medical UniversityKunming, China
| | - Feng Zhang
- Key Laboratory of Biopesticide and Chemical Biology, School of Life Sciences, Fujian Agriculture and Forestry UniversityFuzhou, China
| | - En-Min Zhou
- State Key Laboratory of Biocontrol and Guangdong Provincial Key Laboratory of Plant Resources, School of Life Sciences, Sun Yat-Sen UniversityGuangzhou, China
| | - Xiao-Yang Zhi
- School of Life Sciences, Yunnan Institute of Microbiology, Yunnan UniversityKunming, China
| | - Wen-Jun Li
- School of Life Sciences, Yunnan Institute of Microbiology, Yunnan UniversityKunming, China.,State Key Laboratory of Biocontrol and Guangdong Provincial Key Laboratory of Plant Resources, School of Life Sciences, Sun Yat-Sen UniversityGuangzhou, China.,Key Laboratory of Biogeography and Bioresource in Arid Land, Xinjiang Institute of Ecology and Geography, Chinese Academy of SciencesÜrümqi, China
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Zhang Z, Wang M, Gao R, Yu X, Chen G. Synergistic effect of thermostable β-glucosidase TN0602 and cellulase on cellulose hydrolysis. 3 Biotech 2017; 7:54. [PMID: 28444598 DOI: 10.1007/s13205-017-0672-2] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/17/2017] [Accepted: 02/27/2017] [Indexed: 01/22/2023] Open
Abstract
Thermophilic enzymes have many potential benefits in industrial production with increased flexibility related to process configurations. A thermostable β-glucosidase from Thermotoga naphthophila RUK-10 was found to possess catalytic activity for cellobiose hydrolysis with a high potential for application in biomass conversion. The aggregation of cellobiose often has an inhibitory effect on cellobiohydrolases and endoglucanases during cellulose hydrolysis. The presence of β-glucosidases has a significant effect on reducing inhibition from hydrolytic products by hydrolysing the intermedia cellobiose. In this study, β-glucosidase TN0602 exhibited a high tolerance to glucose and high thermostability even after a long incubation (>72 h). Additionally, supplementing β-glucosidase TN0602 with microcrystalline cellulose, untreated corn straw and steam-exploded corn straw hydrolysis reactions containing a commercial cellulase led to an increased conversion rate in released glucose compared to hydrolysis without the addition of β-glucosidase (15.82, 30.62 and 35.21%, respectively); the increase of conversion rates were 61.86, 93.50 and 94.55%. It was thus shown that an obvious synergistic effect exists between TN0602 and cellulases for cellulose hydrolysis, suggesting its potential as a component of enzymatic cocktails for the conversion of lignocellulosic biomass to other chemicals.
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Kawakami R, Sakuraba H, Ohmori T, Ohshima T. First characterization of an archaeal amino acid racemase with broad substrate specificity from the hyperthermophile Pyrococcus horikoshii OT-3. J Biosci Bioeng 2017; 124:23-27. [PMID: 28343923 DOI: 10.1016/j.jbiosc.2017.02.004] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/03/2016] [Revised: 01/26/2017] [Accepted: 02/05/2017] [Indexed: 01/22/2023]
Abstract
A novel amino acid racemase with broad substrate specificity (BAR) was recently isolated from the hyperthermophilic archaeon Pyrococcus horikoshii OT-3. Characterization of this enzyme has been difficult, however, because the recombinant enzyme is produced mainly as an inclusion body in Escherichia coli. In this study, expression of the recombinant protein into the soluble fraction was markedly improved by co-expression with chaperone molecules. The purified enzyme retained its full activity after incubation at 80°C for at least 2 h in buffer (pH 7-10), making this enzyme the most thermostable amino acid racemase so far known. Besides the nine amino acids containing hydrophobic and aromatic amino acids previously reported (Kawakami et al., Amino Acids, 47, 1579-1587, 2015), the enzyme exhibited substantial activity toward Thr (about 42% of relative activity toward Phe) and showed no activity toward Arg, His, Gln, and Asn. The substrate specificity of this enzyme thus differs markedly from those of other known amino acid racemases. In particular, the high reaction rate with Trp and Tyr, in addition to Leu, Met and Phe as substrates is a noteworthy feature of this enzyme. The high reactivity toward Trp and Tyr, as well as extremely high thermostability, is likely a major advantage of using BAR for biochemical conversion of these aromatic amino acids.
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Affiliation(s)
- Ryushi Kawakami
- Graduate School of Bioscience and Bioindustry, Tokushima University, 2-1 Minamijosanjima-cho, Tokushima, Tokushima 770-8513, Japan.
| | - Haruhiko Sakuraba
- Department of Applied Biological Science, Faculty of Agriculture, Kagawa University, 2392 Ikenobe, Miki-cho, Kita-gun, Kagawa 761-0795, Japan
| | - Taketo Ohmori
- Department of Biomedical Engineering, Faculty of Engineering, Osaka Institute of Technology, 5-16-1 Omiya, Asahi-ku, Osaka 535-8585, Japan
| | - Toshihisa Ohshima
- Department of Biomedical Engineering, Faculty of Engineering, Osaka Institute of Technology, 5-16-1 Omiya, Asahi-ku, Osaka 535-8585, Japan
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Liu Y, Li R, Wang J, Zhang X, Jia R, Gao Y, Peng H. Increased enzymatic hydrolysis of sugarcane bagasse by a novel glucose- and xylose-stimulated β-glucosidase from Anoxybacillus flavithermus subsp. yunnanensis E13 T. BMC BIOCHEMISTRY 2017; 18:4. [PMID: 28302049 PMCID: PMC5356265 DOI: 10.1186/s12858-017-0079-z] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 11/22/2016] [Accepted: 03/13/2017] [Indexed: 01/01/2023]
Abstract
Background β-Glucosidase is claimed as a key enzyme in cellulose hydrolysis. The cellulosic fibers are usually entrapped with hemicelluloses containing xylose. So there is ongoing interest in searching for glucose- and xylose-stimulated β-glucosidases to increase the efficiency of hydrolysis of cellulosic biomass. Results A thermostable β-glucosidase gene (Bglp) was cloned from Anoxybacillus flavithermus subsp. yunnanensis E13T and characterized. Optimal enzyme activity was observed at 60 °C and pH 7.0. Bglp was relatively stable at 60 °C with a 10-h half-life. The kinetic parameters Vmax and Km for p-nitrophenyl-β-D-glucopyranoside (pNPG) were 771 ± 39 μmol/min/mg and 0.29 ± 0.01 mM, respectively. The activity of Bglp is dramatically stimulated by glucose or xylose at concentrations up to 1.4 M. After Bglp was added to Celluclast® 1.5 L, the conversion of sugarcane bagasse was 48.4 ± 0.8%, which was much higher than of Celluclast® 1.5 L alone. Furthermore, Bglp showed obvious advantages in the hydrolysis when initial concentrations of glucose and xylose are high. Conclusions The supplementation of BglP significantly enhanced the glucose yield from sugarcane bagasse, especially in the presence of high concentrations of glucose or xylose. Bglp should be a promising candidate for industrial applications. Electronic supplementary material The online version of this article (doi:10.1186/s12858-017-0079-z) contains supplementary material, which is available to authorized users.
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Affiliation(s)
- Yang Liu
- Anhui Provincial Engineering Technology Research Center of Microorganisms and Biocatalysis. School of Life Sciences, Anhui University, Hefei, Anhui, China.,College of Biological and Food Engineering, Chuzhou University, Chuzhou, Anhui, China
| | - Rui Li
- Anhui Provincial Engineering Technology Research Center of Microorganisms and Biocatalysis. School of Life Sciences, Anhui University, Hefei, Anhui, China
| | - Jing Wang
- Anhui Provincial Engineering Technology Research Center of Microorganisms and Biocatalysis. School of Life Sciences, Anhui University, Hefei, Anhui, China
| | - Xiaohan Zhang
- Anhui Provincial Engineering Technology Research Center of Microorganisms and Biocatalysis. School of Life Sciences, Anhui University, Hefei, Anhui, China
| | - Rong Jia
- Anhui Provincial Engineering Technology Research Center of Microorganisms and Biocatalysis. School of Life Sciences, Anhui University, Hefei, Anhui, China
| | - Yi Gao
- Anhui Provincial Engineering Technology Research Center of Microorganisms and Biocatalysis. School of Life Sciences, Anhui University, Hefei, Anhui, China
| | - Hui Peng
- Anhui Provincial Engineering Technology Research Center of Microorganisms and Biocatalysis. School of Life Sciences, Anhui University, Hefei, Anhui, China.
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Li Y, Arakawa G, Tokuda G, Watanabe H, Arioka M. Heterologous expression in Pichia pastoris and characterization of a β-glucosidase from the xylophagous cockroach Panesthia angustipennis spadica displaying high specific activity for cellobiose. Enzyme Microb Technol 2017; 97:104-113. [DOI: 10.1016/j.enzmictec.2016.11.004] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/15/2016] [Revised: 10/18/2016] [Accepted: 11/14/2016] [Indexed: 01/14/2023]
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Kuusk S, Väljamäe P. When substrate inhibits and inhibitor activates: implications of β-glucosidases. BIOTECHNOLOGY FOR BIOFUELS 2017; 10:7. [PMID: 28053666 PMCID: PMC5209912 DOI: 10.1186/s13068-016-0690-z] [Citation(s) in RCA: 33] [Impact Index Per Article: 4.7] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/29/2016] [Accepted: 12/16/2016] [Indexed: 05/15/2023]
Abstract
BACKGROUND β-glucosidases (BGs) catalyze the hydrolysis of β-glycosidic bonds in glucose derivatives. They constitute an important group of enzymes with biotechnological interest like supporting cellulases in degradation of lignocellulose to fermentable sugars. In the latter context, the glucose tolerant BGs are of particular interest. These BGs often show peculiar kinetics, including inhibitory effects of substrates and activating effects of inhibitors, such as glucose or xylose. The mechanisms behind the activating/inhibiting effects are poorly understood. The nonproductive binding of substrate is expected in cases where enzymes with multiple consecutive binding subsites are studied on substrates with a low degree of polymerization. The effects of inhibitors to BGs exerting nonproductive binding of substrate have not been discussed in the literature before. RESULTS Here, we performed analyses of different reaction schemes using the catalysis by retaining BGs as a model. We found that simple competition of inhibitor with nonproductive binding of substrate can account for the activation of enzyme by inhibitor without involving any allosteric effects. The transglycosylation to inhibitor was also able to explain the activating effect of inhibitor. For both mechanisms, the activation was caused by the increase of kcat with increasing inhibitor concentration, while kcat/Km always decreased. Therefore, the activation by inhibitor was more pronounced at high substrate concentrations. The possible contribution of the two mechanisms in the activation by inhibitor was dependent on the rate-limiting step of glycosidic bond hydrolysis as well as on whether and which glucose-unit-binding subsites are interacting. CONCLUSION Knowledge on the mechanisms of the activating/inhibiting effects of inhibitors helps the rational engineering and selection of BGs for biotechnological applications. Provided that the catalysis is consistent with the reaction schemes addressed here and underlying assumptions, the mechanism of activation by inhibitor reported here is applicable for all enzymes exerting nonproductive binding of substrate.
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Affiliation(s)
- Silja Kuusk
- Institute of Molecular and Cell Biology, University of Tartu, Riia 23b – 202, 51010 Tartu, Estonia
| | - Priit Väljamäe
- Institute of Molecular and Cell Biology, University of Tartu, Riia 23b – 202, 51010 Tartu, Estonia
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47
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Kaplan O, Zárubová J, Mikulová B, Filová E, Bártová J, Bačáková L, Brynda E. Enhanced Mitogenic Activity of Recombinant Human Vascular Endothelial Growth Factor VEGF121 Expressed in E. coli Origami B (DE3) with Molecular Chaperones. PLoS One 2016; 11:e0163697. [PMID: 27716773 PMCID: PMC5055331 DOI: 10.1371/journal.pone.0163697] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/04/2016] [Accepted: 09/13/2016] [Indexed: 12/22/2022] Open
Abstract
We describe the production of a highly-active mutant VEGF variant, α2-PI1-8-VEGF121, which contains a substrate sequence for factor XIIIa at the aminoterminus designed for incorporation into a fibrin gel. The α2-PI1-8-VEGF121 gene was synthesized, cloned into a pET-32a(+) vector and expressed in Escherichia coli Origami B (DE3) host cells. To increase the protein folding and the solubility, the resulting thioredoxin-α2-PI1-8-VEGF121 fusion protein was co-expressed with recombinant molecular chaperones GroES/EL encoded by independent plasmid pGro7. The fusion protein was purified from the soluble fraction of cytoplasmic proteins using affinity chromatography. After cleavage of the thioredoxin fusion part with thrombin, the target protein was purified by a second round of affinity chromatography. The yield of purified α2-PI1-8-VEGF121 was 1.4 mg per liter of the cell culture. The α2-PI1-8-VEGF121 expressed in this work increased the proliferation of endothelial cells 3.9-8.7 times in comparison with commercially-available recombinant VEGF121. This very high mitogenic activity may be caused by co-expression of the growth factor with molecular chaperones not previously used in VEGF production. At the same time, α2-PI1-8-VEGF121 did not elicit considerable inflammatory activation of human endothelial HUVEC cells and human monocyte-like THP-1 cells.
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Affiliation(s)
- Ondřej Kaplan
- Institute of Macromolecular Chemistry, Czech Academy of Sciences, CZ-162 06, Prague, Czech Republic
- Institute of Physiology, Czech Academy of Sciences, CZ-142 20, Prague, Czech Republic
- * E-mail:
| | - Jana Zárubová
- Institute of Physiology, Czech Academy of Sciences, CZ-142 20, Prague, Czech Republic
| | - Barbora Mikulová
- Institute of Physiology, Czech Academy of Sciences, CZ-142 20, Prague, Czech Republic
- Faculty of Science, Charles University in Prague, CZ-128 40, Prague, Czech Republic
| | - Elena Filová
- Institute of Physiology, Czech Academy of Sciences, CZ-142 20, Prague, Czech Republic
| | - Jiřina Bártová
- School of Dental Medicine, General University Hospital in Prague, CZ-128 08, Prague, Czech Republic
| | - Lucie Bačáková
- Institute of Physiology, Czech Academy of Sciences, CZ-142 20, Prague, Czech Republic
| | - Eduard Brynda
- Institute of Macromolecular Chemistry, Czech Academy of Sciences, CZ-162 06, Prague, Czech Republic
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Matsuzawa T, Yaoi K. Screening, identification, and characterization of a novel saccharide-stimulated β-glycosidase from a soil metagenomic library. Appl Microbiol Biotechnol 2016; 101:633-646. [DOI: 10.1007/s00253-016-7803-2] [Citation(s) in RCA: 29] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/10/2016] [Revised: 07/20/2016] [Accepted: 08/09/2016] [Indexed: 01/27/2023]
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Chan CS, Sin LL, Chan KG, Shamsir MS, Manan FA, Sani RK, Goh KM. Characterization of a glucose-tolerant β-glucosidase from Anoxybacillus sp. DT3-1. BIOTECHNOLOGY FOR BIOFUELS 2016; 9:174. [PMID: 27555880 PMCID: PMC4994278 DOI: 10.1186/s13068-016-0587-x] [Citation(s) in RCA: 43] [Impact Index Per Article: 5.4] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/01/2016] [Accepted: 08/15/2016] [Indexed: 05/07/2023]
Abstract
BACKGROUND In general, biofuel production involves biomass pretreatment and enzymatic saccharification, followed by the subsequent sugar conversion to biofuel via fermentation. The crucial step in the production of biofuel from biomass is the enzymatic saccharification. Many of the commercial cellulase enzyme cocktails, such as Spezyme(®) CP (Genencor), Acellerase™ 1000 (Genencor), and Celluclast(®) 1.5L (Novozymes), are ineffectively to release free glucose from the pretreated biomass without additional β-glucosidase. RESULTS In this study, for the first time, a β-glucosidase DT-Bgl gene (1359 bp) was identified in the genome of Anoxybacillus sp. DT3-1, and cloned and heterologously expressed in Escherichia coli BL21. Phylogenetic analysis indicated that DT-Bgl belonged to glycosyl hydrolase (GH) family 1. The recombinant DT-Bgl was highly active on cello-oligosaccharides and p-nitrophenyl-β-d-glucopyranoside (pNPG). The DT-Bgl was purified using an Ni-NTA column, with molecular mass of 53 kDa using an SDS-PAGE analysis. It exhibited optimum activity at 70 °C and pH 8.5, and did not require any tested co-factors for activation. The K m and V max values for DT-Bgl were 0.22 mM and 923.7 U/mg, respectively, with pNPG as substrate. The DT-Bgl displayed high glucose tolerance, and retained 93 % activity in the presence of 10 M glucose. CONCLUSIONS Anoxybacillus DT-Bgl is a novel thermostable β-glucosidase with low glucose inhibition, and converts long-chain cellodextrins to cellobiose, and further hydrolyse cellobiose to glucose. Results suggest that DT-Bgl could be useful in the development of a bioprocess for the efficient saccharification of lignocellulosic biomass.
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Affiliation(s)
- Chia Sing Chan
- Faculty of Biosciences and Medical Engineering, Universiti Teknologi Malaysia, 81300 Skudai, Johor Malaysia
| | - Lee Li Sin
- Division of Genetics and Molecular Biology, Institute of Biological Sciences, Faculty of Science, University of Malaya, Kuala Lumpur, Malaysia
| | - Kok-Gan Chan
- Division of Genetics and Molecular Biology, Institute of Biological Sciences, Faculty of Science, University of Malaya, Kuala Lumpur, Malaysia
| | - Mohd Shahir Shamsir
- Faculty of Biosciences and Medical Engineering, Universiti Teknologi Malaysia, 81300 Skudai, Johor Malaysia
| | - Fazilah Abd Manan
- Faculty of Biosciences and Medical Engineering, Universiti Teknologi Malaysia, 81300 Skudai, Johor Malaysia
| | - Rajesh Kumar Sani
- Department of Chemical and Biological Engineering, South Dakota School of Mines and Technology, Rapid City, USA
| | - Kian Mau Goh
- Faculty of Biosciences and Medical Engineering, Universiti Teknologi Malaysia, 81300 Skudai, Johor Malaysia
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50
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Baba Y, Sumitani JI, Tanaka K, Tani S, Kawaguchi T. Site-saturation mutagenesis for β-glucosidase 1 from Aspergillus aculeatus to accelerate the saccharification of alkaline-pretreated bagasse. Appl Microbiol Biotechnol 2016; 100:10495-10507. [DOI: 10.1007/s00253-016-7726-y] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/14/2016] [Revised: 06/30/2016] [Accepted: 07/04/2016] [Indexed: 01/05/2023]
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