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Thomas L, Ram H, Singh VP. Multipurpose cellulases of Promicromonospora sp. VP111, with broad substrate specificity and tolerance properties. J Basic Microbiol 2023. [PMID: 37097714 DOI: 10.1002/jobm.202200679] [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: 12/06/2022] [Revised: 04/05/2023] [Accepted: 04/13/2023] [Indexed: 04/26/2023]
Abstract
Cellulolytic actinobacterium, Promicromonospora sp. VP111 concomitantly produced cellulases (CELs), xylanase and pectinase when grown on commercial cellulose and untreated agricultural lignocellulosic residues (wheat straw and sugarcane bagasse). Secreted CELs hydrolyzed (enhanced with Co2+ ion) multiple cellulosic substrates, including sodium carboxymethyl cellulose (Na-CMC), Whatman filter paper no. 1, microcrystalline cellulose (avicel), p-nitrophenyl-β-D-glucopyranoside (pNPG), laminarin, and cellulose powder. The CELs showed stabilities in the presence of various chemicals, including glucose (0.2 M), detergents (1%, w/v or v/v), denaturants (1%, w/v or v/v), and sodium chloride (NaCl, 30%, w/v). The CELs were fractionated using ammonium sulfate precipitation and dialysis. Activities (%) of fractionated CELs were retained at 60°C for endoglucanase/carboxymethyl cellulase (CMCase) (88.38), filter paper cellulase (FPase) (77.55), and β-glucosidase (90.52), which indicated of thermo-stability. Similarly, the activities (%) for CMCase (85.79), FPase (82.48), and β-glucosidase (85.92) at pH 8.5 indicated of alkaline-stability. Kinetic factors, Km and Vmax for endoglucanase component of fractionated CELs were 0.014 g/l and 158.23 µM glucose/min/mL, respectively. Fractionated CELs yielded activation energies (kJ/mol) of 17.933, 6.294, and 4.207 for CMCase, FPase, and β-glucosidase activities, respectively in linear thermostable Arrhenius plots. Thus, this study reports on the multipurpose CELs from an untreated agricultural residue utilizing Promicromonospora in relation to broad substrate specificity, halo-tolerance, alkaline-tolerance, detergent-tolerance, thermo-tolerance, organic solvent-tolerance, and end product-tolerance.
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Affiliation(s)
- Lebin Thomas
- Department of Botany, Hansraj College, University of Delhi, New Delhi, India
| | - Hari Ram
- National Chemical Laboratory (NCL), National Collection of Industrial Microorganisms (NCIM), Biochemical Sciences Division, Pune, India
| | - Ved P Singh
- Applied Microbiology and Biotechnology Laboratory, Department of Botany, University of Delhi, New Delhi, India
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Sun N, Liu X, Zhang B, Wang X, Na W, Tan Z, Li X, Guan Q. Characterization of a novel recombinant halophilic β-glucosidase of Trichoderma harzianum derived from Hainan mangrove. BMC Microbiol 2022; 22:185. [PMID: 35902815 PMCID: PMC9331182 DOI: 10.1186/s12866-022-02596-w] [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: 12/26/2021] [Accepted: 07/07/2022] [Indexed: 11/10/2022] Open
Abstract
BACKGROUND β-glucosidase is an important biomass-degrading enzyme and plays a vital role in generating renewable biofuels through enzymatic saccharification. In this study, we analyzed the transcriptome of Trichoderma harzianum HTASA derived from Hainan mangrove and identified a new gene encoding β-glucosidase Bgl3HB. And the biochemically characterization of β-glucosidase activity was performed. RESULTS Bgl3HB showed substantial catalytic activity in the pH range of 3.0-5.0 and at temperatures of 40 ℃-60 ℃. The enzyme was found quite stable at 50 ℃ with a loss of only 33.4% relative activity after 240 min of heat exposure. In addition, all tested metal ions were found to promote the enzyme activity. The β-glucosidase activity of Bgl3HB was enhanced by 2.12-fold of its original activity in the presence of 5 M NaCl. Surprisingly, Bgl3HB also showed a remarkable ability to hydrolyze laminarin compared to other measured substrates. Enzyme efficiency was examined in the sugarcane bagasse saccharification processes, in which Bgl3HB with 5 M NaCl worked better supplementing Celluclast 1.5L than the commercial Novozyme 188 ascertained it as an admirably suited biocatalyst for the utilization of agricultural waste. In this work, this is the first report of a halophilic β-glucosidase from Trichoderma harzianum, and represents the β-glucosidase with the highest known NaCl activation concentration. And adding 5 M NaCl could enhance saccharification performance even better than commercial cellulase. CONCLUSIONS These results show that Bgl3HB has great promise as a highly stable and highly efficient cellulase with important future applications in the industrial production of biofuels.
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Affiliation(s)
- Nan Sun
- Lab of Animal Nutrition, Reproduction & Breeding, College of Animal Science and Technology, Hainan University, No.58 Renmin Avenue, Meilan, Haikou, 570228, P. R. China
| | - Xiaoxuan Liu
- Lab of Animal Nutrition, Reproduction & Breeding, College of Animal Science and Technology, Hainan University, No.58 Renmin Avenue, Meilan, Haikou, 570228, P. R. China
| | - Bingxi Zhang
- Lab of Animal Nutrition, Reproduction & Breeding, College of Animal Science and Technology, Hainan University, No.58 Renmin Avenue, Meilan, Haikou, 570228, P. R. China
| | - Xuemei Wang
- Lab of Animal Nutrition, Reproduction & Breeding, College of Animal Science and Technology, Hainan University, No.58 Renmin Avenue, Meilan, Haikou, 570228, P. R. China.
| | - Wei Na
- Lab of Animal Genetics, Reproduction & Breeding, College of Animal Science and Technology, Hainan University, No.58 Renmin Avenue, Meilan, Haikou, 570228, P. R. China
| | - Zhen Tan
- Lab of Animal Genetics, Reproduction & Breeding, College of Animal Science and Technology, Hainan University, No.58 Renmin Avenue, Meilan, Haikou, 570228, P. R. China
| | - Xiaochun Li
- Lab of Animal Genetics, Reproduction & Breeding, College of Animal Science and Technology, Hainan University, No.58 Renmin Avenue, Meilan, Haikou, 570228, P. R. China
| | - Qingfeng Guan
- Lab of Microorganism Resource and Utilization Research, School of Life Sciences, Hainan University, No.58 Renmin Avenue, Meilan, Haikou, 570228, P. R. China
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Gu J, Wang D, Wang Q, Liu W, Chen X, Li X, Yang F. Novel β-Glucosidase Mibgl3 from Microbacterium sp. XT11 with Oligoxanthan-Hydrolyzing Activity. JOURNAL OF AGRICULTURAL AND FOOD CHEMISTRY 2022; 70:8713-8724. [PMID: 35793414 DOI: 10.1021/acs.jafc.2c03386] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/15/2023]
Abstract
The enzymatic pathway of xanthan depolymerization has been predicted previously; however, the β-glucosidase and unsaturated glucuronyl hydrolase in this system have not been cloned and characterized. This lack of knowledge hinders rational modification of xanthan and exploration of new applications. In this work, we report on the properties of Mibgl3, a xanthan-degrading enzyme isolated from Microbacterium sp. XT11. Mibgl3 exhibits typical structural features of the GH3 family but shares low sequence identity with reported GH3 enzymes. The activity of Mibgl3 can be inhibited by Cu2+, Fe2+, Zn2+, and glucose. Unlike most β-glucosidases, Mibgl3 can tolerate a wide pH range and is activated by high concentrations of NaCl. This improves the commercial value of Mibgl3. In particular, Mibgl3 exhibits higher substrate specificity toward oligoxanthan than other β-glucosidases. Ion chromatography, ultrahigh-performance liquid chromatography-mass spectrometry (UPLC-MS), and GC-MS results showed that Mibgl3 could effectively hydrolyze oligoxanthan to release glucose and glucuronate. Therefore, Mibgl3 might play an important role in xanthan depolymerization by functioning as hydrolase of both the xanthan backbone and sidechains. This knowledge of the enzymatic properties and hydrolysis mechanism of a β-glucosidase will be beneficial for future applications.
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Affiliation(s)
- Jinyun Gu
- School of Biological Engineering, Dalian Polytechnic University, Ganjingzi-qu, Dalian 116034, P. R. China
| | - Dandan Wang
- School of Biological Engineering, Dalian Polytechnic University, Ganjingzi-qu, Dalian 116034, P. R. China
| | - Qian Wang
- School of Biological Engineering, Dalian Polytechnic University, Ganjingzi-qu, Dalian 116034, P. R. China
| | - Weiming Liu
- School of Biological Engineering, Dalian Polytechnic University, Ganjingzi-qu, Dalian 116034, P. R. China
| | - Xiaoyi Chen
- School of Biological Engineering, Dalian Polytechnic University, Ganjingzi-qu, Dalian 116034, P. R. China
| | - Xianzhen Li
- School of Biological Engineering, Dalian Polytechnic University, Ganjingzi-qu, Dalian 116034, P. R. China
| | - Fan Yang
- School of Biological Engineering, Dalian Polytechnic University, Ganjingzi-qu, Dalian 116034, P. R. China
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Su H, Xiao Z, Yu K, Zhang Q, Lu C, Wang G, Wang Y, Liang J, Huang W, Huang X, Wei F. Use of a purified β-glucosidase from coral-associated microorganisms to enhance wine aroma. JOURNAL OF THE SCIENCE OF FOOD AND AGRICULTURE 2022; 102:3467-3474. [PMID: 34841541 DOI: 10.1002/jsfa.11694] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/10/2020] [Revised: 11/24/2021] [Accepted: 11/28/2021] [Indexed: 06/13/2023]
Abstract
BACKGROUND β-Glucosidases (3.2.1.21) play essential roles in the removal of nonreducing terminal glucosyl residues from saccharides and glycosides. However, the full potential and different applications of recombinant high-yield microbial β-glucosidase-producing systems remain to be tackled. RESULTS A β-glucosidase gene designated as Mg132 was isolated from a coral microorganism by high-throughput sequencing and functional screening. The deduced amino acid sequences of Mg132 showed a highest identity of 97% with β-glucosidase predicted in the GenBank database. This gene was cloned and overexpressed in Escherichia coli BL21 (DE3) for the first time. The optimal pH and temperature of purified recombinant Mg132 were 8.0 and 50 °C respectively. It exhibited a high level of stability at high concentration of glucose and ethanol, and glucose concentrations below 300 mmol L-1 distinctly stimulated p-nitrophenyl-β-d-glucopyranoside hydrolysis, reaching 200% at 15% ethanol. The Km and Vmax values were 0.293 mmol L-1 and 320 μmol min-1 mg-1 respectively while using p-nitrophenyl-β-d-glucopyranoside as a substrate. Wine treated with Mg132 had an obvious positive catalytic specificity for glycosides, which give a pleasant flavor of temperate fruity and floral aromas. The total concentration of fermentative volatiles was 201.42 ± 10.22 μg L-1 following Mg132 treatment and 99.21 ± 7.72 μg L-1 in control samples. CONCLUSION Good tolerance of winemaking and aroma fermentative properties suggest that Mg132 has potential application in aroma enhancement in wine and warrants further study. © 2021 Society of Chemical Industry.
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Affiliation(s)
- Hongfei Su
- Coral Reef Research Center of China, Guangxi University, Nanning, China
- Guangxi Laboratory on the Study of Coral Reefs in the South China Sea, Guangxi University, Nanning, China
- School of Marine Sciences, Guangxi University, Nanning, China
| | - Zhenlun Xiao
- Coral Reef Research Center of China, Guangxi University, Nanning, China
- Guangxi Laboratory on the Study of Coral Reefs in the South China Sea, Guangxi University, Nanning, China
- School of Marine Sciences, Guangxi University, Nanning, China
| | - Kefu Yu
- Coral Reef Research Center of China, Guangxi University, Nanning, China
- Guangxi Laboratory on the Study of Coral Reefs in the South China Sea, Guangxi University, Nanning, China
- School of Marine Sciences, Guangxi University, Nanning, China
- Southern Marine Science and Engineering Guangdong Laboratory (Zhuhai), Zhuhai, China
| | - Qi Zhang
- Coral Reef Research Center of China, Guangxi University, Nanning, China
- Guangxi Laboratory on the Study of Coral Reefs in the South China Sea, Guangxi University, Nanning, China
- School of Marine Sciences, Guangxi University, Nanning, China
| | - Chunrong Lu
- Coral Reef Research Center of China, Guangxi University, Nanning, China
- Guangxi Laboratory on the Study of Coral Reefs in the South China Sea, Guangxi University, Nanning, China
- School of Marine Sciences, Guangxi University, Nanning, China
| | - Guanghua Wang
- Coral Reef Research Center of China, Guangxi University, Nanning, China
- Guangxi Laboratory on the Study of Coral Reefs in the South China Sea, Guangxi University, Nanning, China
- School of Marine Sciences, Guangxi University, Nanning, China
| | - Yinghui Wang
- Coral Reef Research Center of China, Guangxi University, Nanning, China
- Guangxi Laboratory on the Study of Coral Reefs in the South China Sea, Guangxi University, Nanning, China
- School of Marine Sciences, Guangxi University, Nanning, China
| | - Jiayuan Liang
- Coral Reef Research Center of China, Guangxi University, Nanning, China
- Guangxi Laboratory on the Study of Coral Reefs in the South China Sea, Guangxi University, Nanning, China
- School of Marine Sciences, Guangxi University, Nanning, China
| | - Wen Huang
- Coral Reef Research Center of China, Guangxi University, Nanning, China
- Guangxi Laboratory on the Study of Coral Reefs in the South China Sea, Guangxi University, Nanning, China
- School of Marine Sciences, Guangxi University, Nanning, China
| | - Xueyong Huang
- Coral Reef Research Center of China, Guangxi University, Nanning, China
- Guangxi Laboratory on the Study of Coral Reefs in the South China Sea, Guangxi University, Nanning, China
- School of Marine Sciences, Guangxi University, Nanning, China
| | - Fen Wei
- Coral Reef Research Center of China, Guangxi University, Nanning, China
- Guangxi Laboratory on the Study of Coral Reefs in the South China Sea, Guangxi University, Nanning, China
- School of Marine Sciences, Guangxi University, Nanning, China
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Cai LN, Xu SN, Lu T, Lin DQ, Yao SJ. Salt-tolerant and thermostable mechanisms of an endoglucanase from marine Aspergillus niger. BIORESOUR BIOPROCESS 2022; 9:44. [PMID: 38647856 PMCID: PMC10991132 DOI: 10.1186/s40643-022-00533-3] [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: 12/16/2021] [Accepted: 03/31/2022] [Indexed: 11/10/2022] Open
Abstract
The cellulase cocktail of marine Aspergillus niger exhibited salt-tolerant and thermostable properties, which is of great potential in industrial application. In order to excavate the single tolerant cellulase components from complex cellulase cocktail, constitutive homologous expression was employed for direct obtainment of the endoglucanase (AnEGL). Enzymatic property study revealed that AnEGL exhibited a property of salt tolerance and a strong thermostability in high salinity environment. Significantly, its activity increased to 129% and the half-life at 65 °C increased to 27.7-fold with the presence of 4.5 M NaCl. Molecular dynamics simulation revealed that Na+ and Cl- could form salt bridges with charged residues, and then influenced the activity of loops and the stability of substrate binding pocket, which accounted for the salt tolerance and thermostability. Further, site-specific mutagenesis study proved that the residues Asp95 and Asp99 in the pocket were of great concern for the tolerant properties. The salt-tolerant and thermostable AnEGL was of great value in lignocellulosic utilization and the conjectural mechanisms were of referential significance for other tolerant enzymes.
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Affiliation(s)
- Li-Nian Cai
- Key Laboratory of Biomass Chemical Engineering of Ministry of Education, College of Chemical and Biological Engineering, Zhejiang University, Hangzhou, 310027, China
| | - Sheng-Nan Xu
- Key Laboratory of Biomass Chemical Engineering of Ministry of Education, College of Chemical and Biological Engineering, Zhejiang University, Hangzhou, 310027, China
| | - Tao Lu
- College of Environment, Zhejiang University of Technology, Hangzhou, 310014, China
| | - Dong-Qiang Lin
- Key Laboratory of Biomass Chemical Engineering of Ministry of Education, College of Chemical and Biological Engineering, Zhejiang University, Hangzhou, 310027, China
| | - Shan-Jing Yao
- Key Laboratory of Biomass Chemical Engineering of Ministry of Education, College of Chemical and Biological Engineering, Zhejiang University, Hangzhou, 310027, China.
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Su H, Zhang Q, Yu K, Lu C, Xiao Z, Huang Q, Wang S, Wang Y, Wang G, Liang J. A Novel Neutral and Mesophilic β-Glucosidase from Coral Microorganisms for Efficient Preparation of Gentiooligosaccharides. Foods 2021; 10:foods10122985. [PMID: 34945537 PMCID: PMC8700683 DOI: 10.3390/foods10122985] [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: 10/29/2021] [Revised: 11/12/2021] [Accepted: 12/01/2021] [Indexed: 11/16/2022] Open
Abstract
β-glucosidases can produce gentiooligosaccharides that are lucrative and promising for the prebiotic and alternative food industries. However, the commercial production of gentiooligosaccharides using β-glucosidase is challenging, as this process is limited by the need for high thermal energy and increasing demand for the enzyme. Here, a putative β-glucosidase gene, selected from the coral microbial metagenome, was expressed in Escherichia coli. Reverse hydrolysis of glucose by Blg163 at pH 7.0 and 40 °C achieved a gentiooligosaccharide yield of 43.02 ± 3.20 g·L−1 at a conversion rate of 5.38 ± 0.40%. Transglycosylation of mixed substrates, glucose and cellobiose, by Blg163 consumed 21.6 U/0.5 g glucose/g cellobiose, achieving a gentiooligosaccharide yield of 70.34 ± 2.20 g·L−1 at a conversion rate of 15.63%, which is close to the highest yield reported in previous findings. Blg163-mediated synthesis of gentiooligosaccharides is the mildest reaction and the lowest β-glucosidase consumption reported to date.
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Affiliation(s)
- Hongfei Su
- Coral Reef Research Center of China, Guangxi Laboratory on the Study of Coral Reefs in the South China Sea, School of Marine Sciences, Guangxi University, Nanning 530004, China; (H.S.); (Q.Z.); (C.L.); (Z.X.); (Q.H.); (Y.W.); (G.W.); (J.L.)
| | - Qi Zhang
- Coral Reef Research Center of China, Guangxi Laboratory on the Study of Coral Reefs in the South China Sea, School of Marine Sciences, Guangxi University, Nanning 530004, China; (H.S.); (Q.Z.); (C.L.); (Z.X.); (Q.H.); (Y.W.); (G.W.); (J.L.)
| | - Kefu Yu
- Coral Reef Research Center of China, Guangxi Laboratory on the Study of Coral Reefs in the South China Sea, School of Marine Sciences, Guangxi University, Nanning 530004, China; (H.S.); (Q.Z.); (C.L.); (Z.X.); (Q.H.); (Y.W.); (G.W.); (J.L.)
- Southern Marine Science and Engineering Guangdong Laboratory, Zhuhai 519000, China
- Correspondence:
| | - Chunrong Lu
- Coral Reef Research Center of China, Guangxi Laboratory on the Study of Coral Reefs in the South China Sea, School of Marine Sciences, Guangxi University, Nanning 530004, China; (H.S.); (Q.Z.); (C.L.); (Z.X.); (Q.H.); (Y.W.); (G.W.); (J.L.)
| | - Zhenlun Xiao
- Coral Reef Research Center of China, Guangxi Laboratory on the Study of Coral Reefs in the South China Sea, School of Marine Sciences, Guangxi University, Nanning 530004, China; (H.S.); (Q.Z.); (C.L.); (Z.X.); (Q.H.); (Y.W.); (G.W.); (J.L.)
| | - Qinyu Huang
- Coral Reef Research Center of China, Guangxi Laboratory on the Study of Coral Reefs in the South China Sea, School of Marine Sciences, Guangxi University, Nanning 530004, China; (H.S.); (Q.Z.); (C.L.); (Z.X.); (Q.H.); (Y.W.); (G.W.); (J.L.)
| | - Shuying Wang
- School of Resources, Environment and Maters, Guangxi University, Nanning 530004, China;
| | - Yinghui Wang
- Coral Reef Research Center of China, Guangxi Laboratory on the Study of Coral Reefs in the South China Sea, School of Marine Sciences, Guangxi University, Nanning 530004, China; (H.S.); (Q.Z.); (C.L.); (Z.X.); (Q.H.); (Y.W.); (G.W.); (J.L.)
| | - Guanghua Wang
- Coral Reef Research Center of China, Guangxi Laboratory on the Study of Coral Reefs in the South China Sea, School of Marine Sciences, Guangxi University, Nanning 530004, China; (H.S.); (Q.Z.); (C.L.); (Z.X.); (Q.H.); (Y.W.); (G.W.); (J.L.)
| | - Jiayuan Liang
- Coral Reef Research Center of China, Guangxi Laboratory on the Study of Coral Reefs in the South China Sea, School of Marine Sciences, Guangxi University, Nanning 530004, China; (H.S.); (Q.Z.); (C.L.); (Z.X.); (Q.H.); (Y.W.); (G.W.); (J.L.)
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Su H, Xiao Z, Yu K, Zhang Q, Lu C, Wang G, Wang Y, Liang J, Huang W, Huang X, Wei F. High Diversity of β-Glucosidase-Producing Bacteria and Their Genes Associated with Scleractinian Corals. Int J Mol Sci 2021; 22:ijms22073523. [PMID: 33805379 PMCID: PMC8037212 DOI: 10.3390/ijms22073523] [Citation(s) in RCA: 10] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/06/2021] [Revised: 03/23/2021] [Accepted: 03/24/2021] [Indexed: 01/08/2023] Open
Abstract
β-Glucosidase is a microbial cellulose multienzyme that plays an important role in the regulation of the entire cellulose hydrolysis process, which is the rate-limiting step in bacterial carbon cycling in marine environments. Despite its importance in coral reefs, the diversity of β-glucosidase-producing bacteria, their genes, and enzymatic characteristics are poorly understood. In this study, 87 β-glucosidase-producing cultivable bacteria were screened from 6 genera of corals. The isolates were assigned to 21 genera, distributed among three groups: Proteobacteria, Firmicutes, and Actinobacteria. In addition, metagenomics was used to explore the genetic diversity of bacterial β-glucosidase enzymes associated with scleractinian corals, which revealed that these enzymes mainly belong to the glycosidase hydrolase family 3 (GH3). Finally, a novel recombinant β-glucosidase, referred to as Mg9373, encompassing 670 amino acids and a molecular mass of 75.2 kDa, was classified as a member of the GH3 family and successfully expressed and characterized. Mg9373 exhibited excellent tolerance to ethanol, NaCl, and glucose. Collectively, these results suggest that the diversity of β-glucosidase-producing bacteria and genes associated with scleractinian corals is high and novel, indicating great potential for applications in the food industry and agriculture.
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Affiliation(s)
- Hongfei Su
- Coral Reef Research Center of China, Guangxi Laboratory on the Study of Coral Reefs in the South China Sea, School of Marine Sciences, Guangxi University, Nanning 530004, China; (H.S.); (Z.X.); (Q.Z.); (C.L.); (G.W.); (Y.W.); (J.L.); (W.H.); (X.H.); (F.W.)
| | - Zhenlun Xiao
- Coral Reef Research Center of China, Guangxi Laboratory on the Study of Coral Reefs in the South China Sea, School of Marine Sciences, Guangxi University, Nanning 530004, China; (H.S.); (Z.X.); (Q.Z.); (C.L.); (G.W.); (Y.W.); (J.L.); (W.H.); (X.H.); (F.W.)
| | - Kefu Yu
- Coral Reef Research Center of China, Guangxi Laboratory on the Study of Coral Reefs in the South China Sea, School of Marine Sciences, Guangxi University, Nanning 530004, China; (H.S.); (Z.X.); (Q.Z.); (C.L.); (G.W.); (Y.W.); (J.L.); (W.H.); (X.H.); (F.W.)
- Southern Marine Science and Engineering Guangdong Laboratory, Zhuhai 519080, China
- Correspondence:
| | - Qi Zhang
- Coral Reef Research Center of China, Guangxi Laboratory on the Study of Coral Reefs in the South China Sea, School of Marine Sciences, Guangxi University, Nanning 530004, China; (H.S.); (Z.X.); (Q.Z.); (C.L.); (G.W.); (Y.W.); (J.L.); (W.H.); (X.H.); (F.W.)
| | - Chunrong Lu
- Coral Reef Research Center of China, Guangxi Laboratory on the Study of Coral Reefs in the South China Sea, School of Marine Sciences, Guangxi University, Nanning 530004, China; (H.S.); (Z.X.); (Q.Z.); (C.L.); (G.W.); (Y.W.); (J.L.); (W.H.); (X.H.); (F.W.)
| | - Guanghua Wang
- Coral Reef Research Center of China, Guangxi Laboratory on the Study of Coral Reefs in the South China Sea, School of Marine Sciences, Guangxi University, Nanning 530004, China; (H.S.); (Z.X.); (Q.Z.); (C.L.); (G.W.); (Y.W.); (J.L.); (W.H.); (X.H.); (F.W.)
| | - Yinghui Wang
- Coral Reef Research Center of China, Guangxi Laboratory on the Study of Coral Reefs in the South China Sea, School of Marine Sciences, Guangxi University, Nanning 530004, China; (H.S.); (Z.X.); (Q.Z.); (C.L.); (G.W.); (Y.W.); (J.L.); (W.H.); (X.H.); (F.W.)
| | - Jiayuan Liang
- Coral Reef Research Center of China, Guangxi Laboratory on the Study of Coral Reefs in the South China Sea, School of Marine Sciences, Guangxi University, Nanning 530004, China; (H.S.); (Z.X.); (Q.Z.); (C.L.); (G.W.); (Y.W.); (J.L.); (W.H.); (X.H.); (F.W.)
| | - Wen Huang
- Coral Reef Research Center of China, Guangxi Laboratory on the Study of Coral Reefs in the South China Sea, School of Marine Sciences, Guangxi University, Nanning 530004, China; (H.S.); (Z.X.); (Q.Z.); (C.L.); (G.W.); (Y.W.); (J.L.); (W.H.); (X.H.); (F.W.)
| | - Xueyong Huang
- Coral Reef Research Center of China, Guangxi Laboratory on the Study of Coral Reefs in the South China Sea, School of Marine Sciences, Guangxi University, Nanning 530004, China; (H.S.); (Z.X.); (Q.Z.); (C.L.); (G.W.); (Y.W.); (J.L.); (W.H.); (X.H.); (F.W.)
| | - Fen Wei
- Coral Reef Research Center of China, Guangxi Laboratory on the Study of Coral Reefs in the South China Sea, School of Marine Sciences, Guangxi University, Nanning 530004, China; (H.S.); (Z.X.); (Q.Z.); (C.L.); (G.W.); (Y.W.); (J.L.); (W.H.); (X.H.); (F.W.)
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Qu X, Ding B, Li J, Liang M, Du L, Wei Y, Huang R, Pang H. Characterization of a GH3 halophilic β-glucosidase from Pseudoalteromonas and its NaCl-induced activity toward isoflavones. Int J Biol Macromol 2020; 164:1392-1398. [PMID: 32763400 DOI: 10.1016/j.ijbiomac.2020.07.300] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/11/2020] [Revised: 07/23/2020] [Accepted: 07/29/2020] [Indexed: 02/06/2023]
Abstract
A novel β-glucosidase gene was isolated from Pseudoalteromonas sp. GXQ-1 and heterologously expressed in Escherichia coli. The activity of the encoded enzyme, PABGL, toward p-nitrophenyl-β-D-glucopyranoside was increased 8.74-fold by the presence of 3 M NaCl relative to the absence of added NaCl. PABGL hydrolyzed a variety of soy isoflavone substrates. For the conversion of daidzin to daidzein, the production rate was 1.44 mM/h. The addition of NaCl enhanced the hydrolytic activity of PABGL toward daidzin and genistein; the maximum activation by NaCl was 3.48- and 6.79-fold, respectively. This is the first report of a halophilic β-glucosidase from Pseudoalteromonas spp., and represents the β-glucosidase with the highest multiple of activation by NaCl. PABGL exhibits strong potential for applications in food processing and industrial production.
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Affiliation(s)
- Xiaoyi Qu
- State Key Laboratory for Conservation and Utilization of Subtropical Agro-bioresources, Guangxi Microorganism and Enzyme Research Center of Engineering Technology, College of Life Science and Technology, Guangxi University, Nanning 530004, China
| | - Bo Ding
- State Key Laboratory for Conservation and Utilization of Subtropical Agro-bioresources, Guangxi Microorganism and Enzyme Research Center of Engineering Technology, College of Life Science and Technology, Guangxi University, Nanning 530004, China
| | - Jing Li
- State Key Laboratory for Conservation and Utilization of Subtropical Agro-bioresources, Guangxi Microorganism and Enzyme Research Center of Engineering Technology, College of Life Science and Technology, Guangxi University, Nanning 530004, China
| | - Meng Liang
- State Key Laboratory for Conservation and Utilization of Subtropical Agro-bioresources, Guangxi Microorganism and Enzyme Research Center of Engineering Technology, College of Life Science and Technology, Guangxi University, Nanning 530004, China
| | - Liqin Du
- State Key Laboratory for Conservation and Utilization of Subtropical Agro-bioresources, Guangxi Microorganism and Enzyme Research Center of Engineering Technology, College of Life Science and Technology, Guangxi University, Nanning 530004, China.
| | - Yutuo Wei
- State Key Laboratory for Conservation and Utilization of Subtropical Agro-bioresources, Guangxi Microorganism and Enzyme Research Center of Engineering Technology, College of Life Science and Technology, Guangxi University, Nanning 530004, China
| | - Ribo Huang
- State Key Laboratory for Conservation and Utilization of Subtropical Agro-bioresources, Guangxi Microorganism and Enzyme Research Center of Engineering Technology, College of Life Science and Technology, Guangxi University, Nanning 530004, China
| | - Hao Pang
- Guangxi Key Laboratory of Bio-refinery, National Engineering Research Center for Non-Food Bio-refinery, State Key Laboratory of Non-Food Biomass and Enzyme Technology, Guangxi Academy of Sciences, 98 Daling Road, Nanning 530007, China.
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9
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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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10
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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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11
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An overview on marine cellulolytic enzymes and their potential applications. Appl Microbiol Biotechnol 2020; 104:6873-6892. [DOI: 10.1007/s00253-020-10692-y] [Citation(s) in RCA: 17] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/17/2020] [Revised: 05/10/2020] [Accepted: 05/17/2020] [Indexed: 11/26/2022]
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12
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Li H, Yi S, Bell EW, Huang Q, Zhao X. Recombinant Penicillium oxalicum 16 β-Glucosidase 1 Displays Comprehensive Inhibitory Resistance to Several Lignocellulose Pretreatment Products, Ethanol, and Salt. Appl Biochem Biotechnol 2020; 191:772-784. [PMID: 31858406 PMCID: PMC7427447 DOI: 10.1007/s12010-019-03183-y] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/27/2019] [Accepted: 11/11/2019] [Indexed: 11/29/2022]
Abstract
β-Glucosidase (BGL) is a rate-limiting enzyme of lignocellulose hydrolysis for second-generation bioethanol production, but its inhibition by lignocellulose pretreatment products, ethanol, and salt is apparent. Here, the recombinant Penicillium oxalicum 16 BGL 1 (rPO16BGL1) from Pichia pastoris GS115 kept complete activity at 0.2-1.4 mg/mL furan derivatives and phenolic compounds, 50 mg/mL sodium chloride (potassium chloride), or 100 mg/mL ethanol at 40 °C. rPO16BGL1 retained above 50% residual activity at 30 mg/mL organic acid sodium, and 60% residual activity at 40 °C with 300 mg/mL ethanol. Sodium chloride and potassium chloride had a complicated effect on rPO16BGL1, which resulted in activation or inhibition. The inhibition kinetics of the enzyme reaction demonstrated that organic acids and organic acid sodium were non-competitive inhibitors and that ethanol was a competitive inhibitor at < 1.5 mg/mL salicin. Moreover, substrate inhibition of the enzyme was found at > 2 mg/mL salicin, and the Km/KI and Km/KSI average values revealed that the inhibitory strength was ranked as salicin-organic acids > organic acids > salicin-organic acid sodium salt > organic acid sodium salt > salicin > salicin-KCl > salicin-NaCl > salicin-ethanol > ethanol.
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Affiliation(s)
- Hanxin Li
- College of Life Science, Jiangxi Normal University, Nanchang, 330022, China
| | - Shi Yi
- College of Life Science, Jiangxi Normal University, Nanchang, 330022, China
| | - Eric W Bell
- Center for Computational Medicine and Bioinformatics, University of Michigan, Ann Arbor, MI, USA
| | - Qiuxia Huang
- College of Life Science, Jiangxi Normal University, Nanchang, 330022, China
| | - Xihua Zhao
- College of Life Science, Jiangxi Normal University, Nanchang, 330022, China.
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13
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Deng P, Meng C, Wu Y, Xu J, Tang X, Zhang X, Xiao Y, Wang X, Fang Z, Fang W. An unusual GH1 β-glucosidase from marine sediment with β-galactosidase and transglycosidation activities for superior galacto-oligosaccharide synthesis. Appl Microbiol Biotechnol 2020; 104:4927-4943. [DOI: 10.1007/s00253-020-10578-z] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/11/2020] [Revised: 03/08/2020] [Accepted: 03/22/2020] [Indexed: 12/11/2022]
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14
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Emerging technologies for the pretreatment of lignocellulosic materials for bio-based products. Appl Microbiol Biotechnol 2019; 104:455-473. [DOI: 10.1007/s00253-019-10158-w] [Citation(s) in RCA: 28] [Impact Index Per Article: 5.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/13/2019] [Revised: 09/19/2019] [Accepted: 09/24/2019] [Indexed: 10/25/2022]
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15
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Wang C, Liu X, Zhang M, Shao H, Zhang M, Wang X, Wang Q, Bao Z, Fan X, Li H. Efficient Enzyme-Assisted Extraction and Conversion of Polydatin to Resveratrol From Polygonum cuspidatum Using Thermostable Cellulase and Immobilized β-Glucosidase. Front Microbiol 2019; 10:445. [PMID: 30972031 PMCID: PMC6445843 DOI: 10.3389/fmicb.2019.00445] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/20/2018] [Accepted: 02/20/2019] [Indexed: 11/13/2022] Open
Abstract
Resveratrol, a bioactive compound in high quantities in Polygonum cuspidatum, has well-known health benefits. However, it mainly exists in its glycosidic form, polydatin, in plants. To increase the production of resveratrol for various uses in medicine, foods, and cosmetics, an efficient deglycosylation technique is needed for converting polydatin into resveratrol. We screened a new cellulolytic strain of Bacillus from herb compost, and we optimized parameters within the fermentation process using response surface methodology with a Box-Behnken design. The yield of cellulase reached 2701.08 U/L, corresponding to values that were 5.4 times as high as those under unoptimized conditions. The Bacillus cellulase possessed good thermostablity and was stable under both acidic and neutral conditions. The cellulase was then used in the pretreatment of P. cuspidatum root. After incubation at 50°C for 4 h with shaking at 150 rpm, the contents of piceid and resveratrol were determined to be 7.60 ± 0.15 and 9.72 ± 0.29 mg/g, respectively. To obtain complete deglycosylation, immobilized β-glucosidase (bgl2238) was added to the cellulase-treated extracts of P. cuspidatum root to convert residual polydatin into resveratrol. After the first cycle, the contents of piceid and resveratrol were determined to be 0 and 13.69 ± 0.30 mg/g, respectively. Moreover, enzyme activity showed little loss during up to 4 consecutive cycles. These results demonstrated that the immobilized β-glucosidase possessed high deglycosylation activity and outstanding operational stability. The mixture of Bacillus cellulase and immobilized bgl2238 appears promising as a means to increase the supply of resveratrol in the medicine market worldwide.
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Affiliation(s)
- Chunqing Wang
- School of Basic Courses, Guangdong Pharmaceutical University, Guangzhou, China
| | - Xiaolong Liu
- School of Basic Medical Sciences, Anhui Medical University, Hefei, China
- Anhui Province Key Laboratory of Biomass Clean Energy, Department of Chemistry, University of Science and Technology of China, Hefei, China
| | - Mengle Zhang
- School of Basic Courses, Guangdong Pharmaceutical University, Guangzhou, China
| | - Haoyue Shao
- School of Basic Medical Sciences, Anhui Medical University, Hefei, China
| | - Manman Zhang
- School of Basic Medical Sciences, Anhui Medical University, Hefei, China
| | - Xiaomeng Wang
- School of Basic Courses, Guangdong Pharmaceutical University, Guangzhou, China
| | - Qinghua Wang
- School of Basic Courses, Guangdong Pharmaceutical University, Guangzhou, China
| | - Zhining Bao
- Guangzhou Institute of Microbiology, Guangzhou, China
| | - Xinjiong Fan
- School of Basic Medical Sciences, Anhui Medical University, Hefei, China
| | - He Li
- School of Basic Courses, Guangdong Pharmaceutical University, Guangzhou, China
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16
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Cai LN, Xu SN, Lu T, Lin DQ, Yao SJ. Directed expression of halophilic and acidophilic β-glucosidases by introducing homologous constitutive expression cassettes in marine Aspergillus niger. J Biotechnol 2019; 292:12-22. [DOI: 10.1016/j.jbiotec.2018.12.015] [Citation(s) in RCA: 15] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/29/2018] [Revised: 12/18/2018] [Accepted: 12/29/2018] [Indexed: 01/31/2023]
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17
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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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18
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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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19
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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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20
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Tiwari R, Singh PK, Singh S, Nain PKS, Nain L, Shukla P. Bioprospecting of novel thermostable β-glucosidase from Bacillus subtilis RA10 and its application in biomass hydrolysis. BIOTECHNOLOGY FOR BIOFUELS 2017; 10:246. [PMID: 29093750 PMCID: PMC5663093 DOI: 10.1186/s13068-017-0932-8] [Citation(s) in RCA: 20] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/20/2017] [Accepted: 10/19/2017] [Indexed: 05/25/2023]
Abstract
BACKGROUND Saccharification is the most crucial and cost-intensive process in second generation biofuel production. The deficiency of β-glucosidase in commercial enzyme leads to incomplete biomass hydrolysis. The decomposition of biomass at high temperature environments leads us to isolate thermotolerant microbes with β-glucosidase production potential. RESULTS A total of 11 isolates were obtained from compost and cow dung samples that were able to grow at 50 °C. On the basis of qualitative and quantitative estimation of β-glucosidase enzyme production, Bacillus subtilis RA10 was selected for further studies. The medium components and growth conditions were optimized and β-glucosidase enzyme production was enhanced up to 19.8-fold. The β-glucosidase from B. subtilis RA10 retained 78% of activity at 80 °C temperature and 68.32% of enzyme activity was stable even at 50 °C after 48 h of incubation. The supplementation of β-glucosidase from B. subtilis RA10 into commercial cellulase enzyme resulted in 1.34-fold higher glucose release. Furthermore, β-glucosidase was also functionally elucidated by cloning and overexpression of full length GH1 family β-glucosidase gene from B. subtilis RA10. The purified protein was characterized as thermostable β-glucosidase enzyme. CONCLUSIONS The thermostable β-glucosidase enzyme from B. subtilis RA10 would facilitate efficient saccharification of cellulosic biomass into fermentable sugar. Consequently, after saccharification, thermostable β-glucosidase enzyme would be recovered and reused to reduce the cost of overall bioethanol production process.
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Affiliation(s)
- Rameshwar Tiwari
- Enzyme Technology and Protein Bioinformatics Laboratory, Department of Microbiology, Maharshi Dayanand University, Rohtak, Haryana 124001 India
- Division of Microbiology, Indian Agricultural Research Institute, New Delhi, 110012 India
- Indian Institute of Technology Delhi, Hauz Khas, New Delhi, 110 016 India
| | - Puneet Kumar Singh
- Enzyme Technology and Protein Bioinformatics Laboratory, Department of Microbiology, Maharshi Dayanand University, Rohtak, Haryana 124001 India
| | - Surender Singh
- Division of Microbiology, Indian Agricultural Research Institute, New Delhi, 110012 India
| | - Pawan K. S. Nain
- Design and Mechatronic Division, School of Civil and Mechanical Engineering, Galgotias University, Noida, Uttar Pradesh 201312 India
| | - Lata Nain
- Division of Microbiology, Indian Agricultural Research Institute, New Delhi, 110012 India
| | - Pratyoosh Shukla
- Enzyme Technology and Protein Bioinformatics Laboratory, Department of Microbiology, Maharshi Dayanand University, Rohtak, Haryana 124001 India
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21
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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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22
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Zhao XQ, Xu XN, Chen LY. Production of Enzymes from Marine Actinobacteria. ADVANCES IN FOOD AND NUTRITION RESEARCH 2016; 78:137-151. [PMID: 27452169 DOI: 10.1016/bs.afnr.2016.06.002] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/06/2023]
Abstract
Marine actinobacteria are well recognized for their capabilities to produce valuable natural products, which have great potential for applications in medical, agricultural, and fine chemical industries. In addition to producing unique enzymes responsible for biosynthesis of natural products, many marine actinobacteria also produce hydrolytic enzymes which are able to degrade various biopolymers, such as cellulose, xylan, and chitin. These enzymes are important to produce biofuels and biochemicals of interest from renewable biomass. In this chapter, the recent reports of novel enzymes produced by marine actinobacteria are reviewed, and advanced technologies that can be applied to search for novel marine enzymes as well as for improved enzyme production by marine actinobacteria are summarized, which include ribosome engineering, genome mining, as well as synthetic biology studies.
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Affiliation(s)
- X Q Zhao
- State Key Laboratory of Microbial Metabolism and School of Life Science and Biotechnology, Shanghai Jiao Tong University, Shanghai, China.
| | - X N Xu
- School of Life Science and Biotechnology, Dalian University of Technology, Dalian, China
| | - L Y Chen
- School of Life Science and Biotechnology, Dalian University of Technology, Dalian, China
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Sinha SK, Datta S. β-Glucosidase from the hyperthermophilic archaeon Thermococcus sp. is a salt-tolerant enzyme that is stabilized by its reaction product glucose. Appl Microbiol Biotechnol 2016; 100:8399-409. [DOI: 10.1007/s00253-016-7601-x] [Citation(s) in RCA: 32] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/29/2016] [Revised: 04/25/2016] [Accepted: 04/28/2016] [Indexed: 10/21/2022]
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Characterization of a Metagenome-Derived β-Glucosidase and Its Application in Conversion of Polydatin to Resveratrol. Catalysts 2016. [DOI: 10.3390/catal6030035] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022] Open
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Guo B, Amano Y, Nozaki K. Improvements in Glucose Sensitivity and Stability of Trichoderma reesei β-Glucosidase Using Site-Directed Mutagenesis. PLoS One 2016; 11:e0147301. [PMID: 26790148 PMCID: PMC4720395 DOI: 10.1371/journal.pone.0147301] [Citation(s) in RCA: 37] [Impact Index Per Article: 4.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/18/2015] [Accepted: 01/02/2016] [Indexed: 01/07/2023] Open
Abstract
Glucose sensitivity and pH and thermal stabilities of Trichoderma reesei Cel1A (Bgl II) were improved by site-directed mutagenesis of only two amino acid residues (L167W or P172L) at the entrance of the active site. The Cel1A mutant showed high glucose tolerance (50% of inhibitory concentration = 650 mM), glucose stimulation (2.0 fold at 50 mM glucose), and enhanced specific activity (2.4-fold) compared with those of the wild-type Cel1A. Furthermore, the mutant enzyme showed stability at a wide pH range of 4.5–9.0 and possessed high thermal stability up to 50°C with 80% of the residual activities compared with the stability seen at the pH range of 6.5–7.0 and temperatures of up to 40°C in the wild-type Cel1A. Kinetic studies for hydrolysis revealed that the Cel1A mutant was competitively inhibited by glucose at similar levels as the wild-type enzyme. Additionally, the mutant enzyme exhibited substrate inhibition, which gradually disappeared with an increasing glucose concentration. These data suggest that the glucose stimulation was caused by relieve the substrate inhibition in the presence of glucose. To conclude, all the properties improved by the mutagenesis would be great advantages in degradation of cellulosic biomass together with cellulases.
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Affiliation(s)
- Boyang Guo
- Department of Bioscience and Textile Technology, Interdisciplinary Graduate School of Science and Technology, Shinshu University, Nagano, Japan
| | - Yoshihiko Amano
- Department of Bioscience and Textile Technology, Interdisciplinary Graduate School of Science and Technology, Shinshu University, Nagano, Japan
| | - Kouichi Nozaki
- Department of Bioscience and Textile Technology, Interdisciplinary Graduate School of Science and Technology, Shinshu University, Nagano, Japan
- * E-mail:
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Yang F, Yang X, Li Z, Du C, Wang J, Li S. Overexpression and characterization of a glucose-tolerant β-glucosidase from T. aotearoense with high specific activity for cellobiose. Appl Microbiol Biotechnol 2015; 99:8903-15. [DOI: 10.1007/s00253-015-6619-9] [Citation(s) in RCA: 50] [Impact Index Per Article: 5.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/18/2015] [Revised: 04/07/2015] [Accepted: 04/10/2015] [Indexed: 12/20/2022]
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Characterization of salt-tolerant β-glucosidase with increased thermostability under high salinity conditions from Bacillus sp. SJ-10 isolated from jeotgal, a traditional Korean fermented seafood. Bioprocess Biosyst Eng 2015; 38:1335-46. [DOI: 10.1007/s00449-015-1375-x] [Citation(s) in RCA: 25] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/05/2014] [Accepted: 02/08/2015] [Indexed: 10/24/2022]
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Isolation of salt stress-related genes from Aspergillus glaucus CCHA by random overexpression in Escherichia coli. ScientificWorldJournal 2014; 2014:620959. [PMID: 25383373 PMCID: PMC4212599 DOI: 10.1155/2014/620959] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/20/2014] [Accepted: 08/22/2014] [Indexed: 11/20/2022] Open
Abstract
The halotolerant fungus Aspergillus glaucus CCHA was isolated from the surface of wild vegetation around a saltern with the salinity range being 0–31%. Here, a full-length cDNA library of A. glaucus under salt stress was constructed to identify genes related to salt tolerance, and one hundred clones were randomly selected for sequencing and bioinformatics analysis. Among these, 82 putative sequences were functionally annotated as being involved in signal transduction, osmolyte synthesis and transport, or regulation of transcription. Subsequently, the cDNA library was transformed into E. coli cells to screen for putative salt stress-related clones. Five putative positive clones were obtained from E. coli cells grown on LB agar containing 1 M NaCl, on which they showed rapid growth compared to the empty vector control line. Analysis of transgenic Arabidopsis thaliana lines overexpressing CCHA-2142 demonstrated that the gene conferred increased salt tolerance to plants as well by protecting the cellular membranes, suppressing the inhibition of chlorophyll biosynthesis. These results highlight the utility of this A. glaucus cDNA library as a tool for isolating and characterizing genes related to salt tolerance. Furthermore, the identified genes can be used for the study of the underlying biology of halotolerance.
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Mai Z, Su H, Yang J, Huang S, Zhang S. Cloning and characterization of a novel GH44 family endoglucanase from mangrove soil metagenomic library. Biotechnol Lett 2014; 36:1701-9. [DOI: 10.1007/s10529-014-1531-4] [Citation(s) in RCA: 26] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/27/2014] [Accepted: 03/31/2014] [Indexed: 11/30/2022]
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Microorganisms living on macroalgae: diversity, interactions, and biotechnological applications. Appl Microbiol Biotechnol 2014; 98:2917-35. [PMID: 24562178 DOI: 10.1007/s00253-014-5557-2] [Citation(s) in RCA: 86] [Impact Index Per Article: 8.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/18/2013] [Revised: 01/17/2014] [Accepted: 01/20/2014] [Indexed: 01/02/2023]
Abstract
Marine microorganisms play key roles in every marine ecological process, hence the growing interest in studying their populations and functions. Microbial communities on algae remain underexplored, however, despite their huge biodiversity and the fact that they differ markedly from those living freely in seawater. The study of this microbiota and of its relationships with algal hosts should provide crucial information for ecological investigations on algae and aquatic ecosystems. Furthermore, because these microorganisms interact with algae in multiple, complex ways, they constitute an interesting source of novel bioactive compounds with biotechnological potential, such as dehalogenases, antimicrobials, and alga-specific polysaccharidases (e.g., agarases, carrageenases, and alginate lyases). Here, to demonstrate the huge potential of alga-associated organisms and their metabolites in developing future biotechnological applications, we first describe the immense diversity and density of these microbial biofilms. We further describe their complex interactions with algae, leading to the production of specific bioactive compounds and hydrolytic enzymes of biotechnological interest. We end with a glance at their potential use in medical and industrial applications.
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Teugjas H, Väljamäe P. Product inhibition of cellulases studied with 14C-labeled cellulose substrates. BIOTECHNOLOGY FOR BIOFUELS 2013; 6:104. [PMID: 23883520 PMCID: PMC3726336 DOI: 10.1186/1754-6834-6-104] [Citation(s) in RCA: 57] [Impact Index Per Article: 5.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/20/2013] [Accepted: 07/11/2013] [Indexed: 05/02/2023]
Abstract
BACKGROUND As a green alternative for the production of transportation fuels, the enzymatic hydrolysis of lignocellulose and subsequent fermentation to ethanol are being intensively researched. To be economically feasible, the hydrolysis of lignocellulose must be conducted at a high concentration of solids, which results in high concentrations of hydrolysis end-products, cellobiose and glucose, making the relief of product inhibition of cellulases a major challenge in the process. However, little quantitative information on the product inhibition of individual cellulases acting on cellulose substrates is available because it is experimentally difficult to assess the hydrolysis of the heterogeneous polymeric substrate in the high background of added products. RESULTS The cellobiose and glucose inhibition of thermostable cellulases from Acremonium thermophilum, Thermoascus aurantiacus, and Chaetomium thermophilum acting on uniformly 14C-labeled bacterial cellulose and its derivatives, 14C-bacterial microcrystalline cellulose and 14C-amorphous cellulose, was studied. Cellulases from Trichoderma reesei were used for comparison. The enzymes most sensitive to cellobiose inhibition were glycoside hydrolase (GH) family 7 cellobiohydrolases (CBHs), followed by family 6 CBHs and endoglucanases (EGs). The strength of glucose inhibition followed the same order. The product inhibition of all enzymes was relieved at higher temperatures. The inhibition strength measured for GH7 CBHs with low molecular-weight model substrates did not correlate with that measured with 14C-cellulose substrates. CONCLUSIONS GH7 CBHs are the primary targets for product inhibition of the synergistic hydrolysis of cellulose. The inhibition must be studied on cellulose substrates instead of on low molecular-weight model substrates when selecting enzymes for lignocellulose hydrolysis. The advantages of using higher temperatures are an increase in the catalytic efficiency of enzymes and the relief of product inhibition.
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Affiliation(s)
- Hele Teugjas
- Institute of Molecular and Cell Biology, University of Tartu, Riia 23b – 202, Tartu 51010, Estonia
| | - Priit Väljamäe
- Institute of Molecular and Cell Biology, University of Tartu, Riia 23b – 202, Tartu 51010, Estonia
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