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Liu Y, Wang J, Bao C, Dong B, Cao Y. Characterization of a novel GH10 xylanase with a carbohydrate binding module from Aspergillus sulphureus and its synergistic hydrolysis activity with cellulase. Int J Biol Macromol 2021; 182:701-711. [PMID: 33862072 DOI: 10.1016/j.ijbiomac.2021.04.065] [Citation(s) in RCA: 13] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/02/2021] [Revised: 04/08/2021] [Accepted: 04/12/2021] [Indexed: 12/31/2022]
Abstract
A study was carried out to investigate the characterization of a novel Aspergillus sulphureus JCM01963 xylanase (AS-xyn10A) with a carbohydrate binding module (CBM) and its application in degrading alkali pretreated corncob, rapeseed meal and corn stover alone and in combination with a commercial cellulase. In this study, the 3D structure of AS-xyn10A, which contained a CBM at C-terminal. AS-xyn10A and its CBM-truncated variant (AS-xyn10A-dC) was codon-optimized and over-expressed in Komagaella phaffii X-33 (syn. Pichia pastoris) and characterized with optimal condition at 70 °C and pH 5.0, respectively. AS-xyn10A displayed high activity to xylan extracted from corn stover, corncob, and rapeseed meal. The concentration of hydrolyzed xylo-oligosaccharides (XOSs) reached 1592.26 μg/mL, 1149.92 μg/mL, and 621.86 μg/mL, respectively. Xylobiose was the main product (~70%) in the hydrolysis mixture. AS-xyn10A significantly synergized with cellulase to improve the hydrolysis efficiency of corn stover, corncob, and rapeseed meal to glucose. The degree of synergy (DS) was 1.32, 1.31, and 1.30, respectively. Simultaneously, XOSs hydrolyzed with AS-xyn10A and cellulase was improved by 46.48%, 66.13% and 141.45%, respectively. In addition, CBM variant decreased the yields of xylo-oligosaccharide and glucose in rapeseed meal degradation. This study provided a novel GH10 endo-xylanase, which has potential applications in hydrolysis of biomass.
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Affiliation(s)
- Yajing Liu
- State Key Laboratory of Animal Nutrition, College of Animal Science and Technology, China Agricultural University, Beijing 100193, People's Republic of China
| | - Jian Wang
- State Key Laboratory of Animal Nutrition, College of Animal Science and Technology, China Agricultural University, Beijing 100193, People's Republic of China
| | - Chengling Bao
- State Key Laboratory of Animal Nutrition, College of Animal Science and Technology, China Agricultural University, Beijing 100193, People's Republic of China
| | - Bing Dong
- State Key Laboratory of Animal Nutrition, College of Animal Science and Technology, China Agricultural University, Beijing 100193, People's Republic of China
| | - Yunhe Cao
- State Key Laboratory of Animal Nutrition, College of Animal Science and Technology, China Agricultural University, Beijing 100193, People's Republic of China.
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Zhang D, Tu T, Wang Y, Li Y, Luo X, Zheng F, Wang X, Bai Y, Huang H, Su X, Yao B, Zhang T, Luo H. Improving the Catalytic Performance of a Talaromyces leycettanus α-Amylase by Changing the Linker Length. JOURNAL OF AGRICULTURAL AND FOOD CHEMISTRY 2017; 65:5041-5048. [PMID: 28573852 DOI: 10.1021/acs.jafc.7b00838] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/07/2023]
Abstract
A novel α-amylase, Amy13A, that consists of these domains was identified in Talaromyces leycettanus JCM12802: catalytic TIM-barrel fold, domain B, domain C, Thr/Ser-rich linker region, and C-terminal CBM20 domain. The wild type and three mutant enzymes were then expressed in Pichia pastoris GS115 to identify the roles of linker length (Amy13A21 and Amy13A33) and CBM20 (Amy13A-CBM) in catalysis. All enzymes had similar enzymatic properties, exhibiting optimal activities at pH 4.5-5.0 and 55-60 °C, but varied in catalytic performance. When using soluble starch as the substrate, Amy13A21 and Amy13A33 showed specific activities (926.3 and 537.8 units/mg, respectively, vs 252.1 units/mg) and catalytic efficiencies (kcat/Km, 25.7 and 22.0 mL s-1 mg-1, respectively, vs 15.4 mL s-1 mg-1) higher than those of the wild type, while Amy13A-CBM performed worse during catalysis. This study reveals the key roles of the CBM and linker length in the catalysis of GH13 α-amylase.
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Affiliation(s)
- Duoduo Zhang
- Key Laboratory of Industrial Fermentation Microbiology of the Ministry of Education and Tianjin Key Laboratory of Industrial Microbiology, College of Biotechnology, Tianjin University of Science and Technology , Tianjin 300457, China
| | - Tao Tu
- Key Laboratory for Feed Biotechnology of the Ministry of Agriculture, Feed Research Institute, Chinese Academy of Agricultural Sciences , Beijing 100081, China
| | - Yuan Wang
- Key Laboratory for Feed Biotechnology of the Ministry of Agriculture, Feed Research Institute, Chinese Academy of Agricultural Sciences , Beijing 100081, China
| | - Yeqing Li
- Key Laboratory for Feed Biotechnology of the Ministry of Agriculture, Feed Research Institute, Chinese Academy of Agricultural Sciences , Beijing 100081, China
| | - Xuegang Luo
- Key Laboratory of Industrial Fermentation Microbiology of the Ministry of Education and Tianjin Key Laboratory of Industrial Microbiology, College of Biotechnology, Tianjin University of Science and Technology , Tianjin 300457, China
| | - Fei Zheng
- Key Laboratory for Feed Biotechnology of the Ministry of Agriculture, Feed Research Institute, Chinese Academy of Agricultural Sciences , Beijing 100081, China
| | - Xiaoyu Wang
- Key Laboratory for Feed Biotechnology of the Ministry of Agriculture, Feed Research Institute, Chinese Academy of Agricultural Sciences , Beijing 100081, China
| | - Yingguo Bai
- Key Laboratory for Feed Biotechnology of the Ministry of Agriculture, Feed Research Institute, Chinese Academy of Agricultural Sciences , Beijing 100081, China
| | - Huoqing Huang
- Key Laboratory for Feed Biotechnology of the Ministry of Agriculture, Feed Research Institute, Chinese Academy of Agricultural Sciences , Beijing 100081, China
| | - Xiaoyun Su
- Key Laboratory for Feed Biotechnology of the Ministry of Agriculture, Feed Research Institute, Chinese Academy of Agricultural Sciences , Beijing 100081, China
| | - Bin Yao
- Key Laboratory for Feed Biotechnology of the Ministry of Agriculture, Feed Research Institute, Chinese Academy of Agricultural Sciences , Beijing 100081, China
| | - Tongcun Zhang
- Key Laboratory of Industrial Fermentation Microbiology of the Ministry of Education and Tianjin Key Laboratory of Industrial Microbiology, College of Biotechnology, Tianjin University of Science and Technology , Tianjin 300457, China
| | - Huiying Luo
- Key Laboratory for Feed Biotechnology of the Ministry of Agriculture, Feed Research Institute, Chinese Academy of Agricultural Sciences , Beijing 100081, China
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Improved thermostability of an acidic xylanase from Aspergillus sulphureus by combined disulphide bridge introduction and proline residue substitution. Sci Rep 2017; 7:1587. [PMID: 28484256 PMCID: PMC5431495 DOI: 10.1038/s41598-017-01758-5] [Citation(s) in RCA: 34] [Impact Index Per Article: 4.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/08/2016] [Accepted: 04/03/2017] [Indexed: 12/27/2022] Open
Abstract
As a feed additive, xylanase has been widely applied in the feed of monogastric animals, which contains multiple plant polysaccharides. However, during feed manufacture, the high pelleting temperatures challenge wild-type xylanases. The aim of this study was to improve the thermostability of Aspergillus sulphureus acidic xylanase. According to the predicted protein structure, a series of disulphide bridges and proline substitutions were created in the xylanase by PCR, and the mutants were expressed in Pichia pastoris. Enzyme properties were evaluated following chromatographic purification. All the recombinant enzymes showed optima at pH 3.0 and 50 °C or 55 °C and better resistance to some chemicals except for CuSO4. The specific activity of the xylanase was decreased by introduction of the mutations. Compared to the wild-type enzyme, a combined mutant, T53C-T142C/T46P, with a disulphide bond at 53–142 and a proline substitution at 46, showed a 22-fold increase of half-life at 60 °C. In a 10-L fermentor, the maximal xylanase activity of T53C-T142C/T46P reached 1,684 U/mL. It was suggested that the T53C-T142C/T46P mutant xylanase had excellent thermostability characteristics and could be a prospective additive in feed manufacture.
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Ergün BG, Çalık P. Lignocellulose degrading extremozymes produced by Pichia pastoris: current status and future prospects. Bioprocess Biosyst Eng 2016; 39:1-36. [PMID: 26497303 DOI: 10.1007/s00449-015-1476-6] [Citation(s) in RCA: 33] [Impact Index Per Article: 4.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/29/2015] [Accepted: 09/21/2015] [Indexed: 02/06/2023]
Abstract
In this review article, extremophilic lignocellulosic enzymes with special interest on xylanases, β-mannanases, laccases and finally cellulases, namely, endoglucanases, exoglucanases and β-glucosidases produced by Pichia pastoris are reviewed for the first time. Recombinant lignocellulosic extremozymes are discussed from the perspectives of their potential application areas; characteristics of recombinant and native enzymes; the effects of P. pastoris expression system on recombinant extremozymes; and their expression levels and applied strategies to increase the enzyme expression yield. Further, effects of enzyme domains on activity and stability, protein engineering via molecular dynamics simulation and computational prediction, and site-directed mutagenesis and amino acid modifications done are also focused. Superior enzyme characteristics and improved stability due to the proper post-translational modifications and better protein folding performed by P. pastoris make this host favourable for extremozyme production. Especially, glycosylation contributes to the structure, function and stability of enzymes, as generally glycosylated enzymes produced by P. pastoris exhibit better thermostability than non-glycosylated enzymes. However, there has been limited study on enzyme engineering to improve catalytic efficiency and stability of lignocellulosic enzymes. Thus, in the future, studies should focus on protein engineering to improve stability and catalytic efficiency via computational modelling, mutations, domain replacements and fusion enzyme technology. Also metagenomic data need to be used more extensively to produce novel enzymes with extreme characteristics and stability.
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Xu X, Liu MQ, Huo WK, Dai XJ. Obtaining a mutant of Bacillus amyloliquefaciens xylanase A with improved catalytic activity by directed evolution. Enzyme Microb Technol 2016; 86:59-66. [DOI: 10.1016/j.enzmictec.2016.02.001] [Citation(s) in RCA: 25] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/02/2015] [Revised: 02/03/2016] [Accepted: 02/07/2016] [Indexed: 12/29/2022]
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Studies on properties of the xylan-binding domain and linker sequence of xylanase XynG1-1 from Paenibacillus campinasensis G1-1. ACTA ACUST UNITED AC 2015; 42:1591-9. [DOI: 10.1007/s10295-015-1698-2] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/20/2015] [Accepted: 09/28/2015] [Indexed: 10/22/2022]
Abstract
Abstract
Xylanase XynG1-1 from Paenibacillus campinasensis G1-1 consists of a catalytic domain (CD), a family 6_36 carbohydrate-binding module which is a xylan-binding domain (XBD), and a linker sequence (LS) between them. The structure of XynG1-3 from Bacillus pumilus G1-3 consists only of a CD. To investigate the functions and properties of the XBD and LS of XynG1-1, two truncated forms (XynG1-1CDL, XynG1-1CD) and three fusion derivatives (XynG1-3CDL, XynG1-3CDX and XynG1-3CDLX) were constructed and biochemically characterized. The optimum conditions for the catalytic activity of mutants of XynG1-1 and XynG1-3 were 60 °C and pH 7.0, and 55 °C and pH 8.0, respectively, the same as for the corresponding wild-type enzymes. XynGs with an XBD were stable over a broad temperature (30–80 °C) and pH range (4.0–11.0), respectively, on incubation for 3 h. Kinetic parameters (K m, k cat, k cat/K m) of XynGs were determined with soluble birchwood xylan and insoluble oat spelt xylan as substrates. XynGs with the XBD showed better affinities toward, and more efficient catalysis of hydrolysis of the insoluble substrate. The XBD had positive effects on thermostability and pH stability and a crucial function in the ability of the enzyme to bind and hydrolyze insoluble substrate. The LS had little effect on the overall stability of the xylanase and no relationship with affinities for soluble and insoluble substrates or catalytic efficiency.
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Liu MQ, Huo WK, Xu X, Jin DF. An immobilized bifunctional xylanase on carbon-coated chitosan nanoparticles with a potential application in xylan-rich biomass bioconversion. ACTA ACUST UNITED AC 2015. [DOI: 10.1016/j.molcatb.2015.07.002] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/26/2023]
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