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Fernández-López MG, Batista-García RA, Aréchiga-Carvajal ET. Alkaliphilic/Alkali-Tolerant Fungi: Molecular, Biochemical, and Biotechnological Aspects. J Fungi (Basel) 2023; 9:652. [PMID: 37367588 DOI: 10.3390/jof9060652] [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: 02/13/2023] [Revised: 05/08/2023] [Accepted: 05/08/2023] [Indexed: 06/28/2023] Open
Abstract
Biotechnologist interest in extremophile microorganisms has increased in recent years. Alkaliphilic and alkali-tolerant fungi that resist alkaline pH are among these. Alkaline environments, both terrestrial and aquatic, can be created by nature or by human activities. Aspergillus nidulans and Saccharomyces cerevisiae are the two eukaryotic organisms whose pH-dependent gene regulation has received the most study. In both biological models, the PacC transcription factor activates the Pal/Rim pathway through two successive proteolytic mechanisms. PacC is a repressor of acid-expressed genes and an activator of alkaline-expressed genes when it is in an active state. It appears, however, that these are not the only mechanisms associated with pH adaptations in alkali-tolerant fungi. These fungi produce enzymes that are resistant to harsh conditions, i.e., alkaline pH, and can be used in technological processes, such as in the textile, paper, detergent, food, pharmaceutical, and leather tanning industries, as well as in bioremediation of pollutants. Consequently, it is essential to understand how these fungi maintain intracellular homeostasis and the signaling pathways that activate the physiological mechanisms of alkali resistance in fungi.
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Affiliation(s)
- Maikel Gilberto Fernández-López
- Unidad de Manipulación Genética, Laboratorio de Micología y Fitopatología, Facultad de Ciencias Biológicas, Universidad Autónoma de Nuevo León, San Nicolás de los Garza 66451, Mexico
| | - Ramón Alberto Batista-García
- Centro de Investigación en Dinámica Celular, Instituto de Investigación en Ciencias Básicas y Aplicadas, Universidad Autónoma del Estado de Morelos, Cuernavaca 62209, Mexico
| | - Elva Teresa Aréchiga-Carvajal
- Unidad de Manipulación Genética, Laboratorio de Micología y Fitopatología, Facultad de Ciencias Biológicas, Universidad Autónoma de Nuevo León, San Nicolás de los Garza 66451, Mexico
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2
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Dawood A, Ma K. Applications of Microbial β-Mannanases. Front Bioeng Biotechnol 2020; 8:598630. [PMID: 33384989 PMCID: PMC7770148 DOI: 10.3389/fbioe.2020.598630] [Citation(s) in RCA: 36] [Impact Index Per Article: 9.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/25/2020] [Accepted: 10/28/2020] [Indexed: 11/24/2022] Open
Abstract
Mannans are main components of hemicellulosic fraction of softwoods and they are present widely in plant tissues. β-mannanases are the major mannan-degrading enzymes and are produced by different plants, animals, actinomycetes, fungi, and bacteria. These enzymes can function under conditions of wide range of pH and temperature. Applications of β-mannanases have therefore, been found in different industries such as animal feed, food, biorefinery, textile, detergent, and paper and pulp. This review summarizes the most recent studies reported on potential applications of β-mannanases and bioengineering of β-mannanases to modify and optimize their key catalytic properties to cater to growing demands of commercial sectors.
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Affiliation(s)
- Aneesa Dawood
- Department of Microbiology, Quaid-I-Azam University, Islamabad, Pakistan
- Department of Radiology and Medical Imaging, University of Virginia, Charlottesville, VA, United States
| | - Kesen Ma
- Department of Biology, University of Waterloo, Waterloo, ON, Canada
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3
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Heterologous overexpression of a novel halohydrin dehalogenase from Pseudomonas pohangensis and modification of its enantioselectivity by semi-rational protein engineering. Int J Biol Macromol 2020; 146:80-88. [DOI: 10.1016/j.ijbiomac.2019.12.203] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/22/2019] [Revised: 11/06/2019] [Accepted: 12/22/2019] [Indexed: 02/08/2023]
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4
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Wang Z, Xu B, Luo H, Meng K, Wang Y, Liu M, Bai Y, Yao B, Tu T. Production pectin oligosaccharides using Humicola insolens Y1-derived unusual pectate lyase. J Biosci Bioeng 2019; 129:16-22. [PMID: 31400994 DOI: 10.1016/j.jbiosc.2019.07.005] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/08/2019] [Revised: 07/01/2019] [Accepted: 07/22/2019] [Indexed: 12/27/2022]
Abstract
The economical production of pectin oligosaccharides with a specific degree of polymerization and structure from agro-food waste is an industrially important process. This study identified a novel pectate lyase gene (plhy1) from the thermophilic cellulolytic fungus H. insolens Y1 and tested its ability to produce pectin oligosaccharides. The recombinant PLHY1 produced in Pichia pastoris was superior to other similar enzymes due to its high thermal and pH stability. PLHY1 demonstrated optimal enzymatic activity at 55°C and pH 10.0 in the presence of 0.4 mM Ca2+, and preferred methyl esterified substrates for digestion. High performance anion exchange chromatography-pulsed amperometric detector and ultra high performance liquid chromatography in combination with electrospray ionization tandem mass spectrometry analysis showed that galacturonic acid-oligosaccharides with a small degree of polymerization (4-6) were the major hydrolysates produced by the degradation of apple peel pectin by PLHY1. The properties of PLHY1 make it valuable for application in the agro-food industry for the production of pectin oligosaccharides.
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Affiliation(s)
- Zhiyun Wang
- Key Laboratory for Feed Biotechnology of the Ministry of Agriculture, Feed Research Institute, Chinese Academy of Agricultural Sciences, Beijing 100081, PR China; College of Biological Sciences and Engineering, Jiangxi Agricultural University, Nanchang 330100, PR China
| | - Bo Xu
- College of Biological Sciences and Engineering, Jiangxi Agricultural University, Nanchang 330100, PR China
| | - Huiying Luo
- Key Laboratory for Feed Biotechnology of the Ministry of Agriculture, Feed Research Institute, Chinese Academy of Agricultural Sciences, Beijing 100081, PR China
| | - Kun Meng
- Key Laboratory for Feed Biotechnology of the Ministry of Agriculture, Feed Research Institute, Chinese Academy of Agricultural Sciences, Beijing 100081, PR China
| | - Yuan Wang
- Key Laboratory for Feed Biotechnology of the Ministry of Agriculture, Feed Research Institute, Chinese Academy of Agricultural Sciences, Beijing 100081, PR China
| | - Mengting Liu
- Key Laboratory for Feed Biotechnology of the Ministry of Agriculture, Feed Research Institute, Chinese Academy of Agricultural Sciences, Beijing 100081, PR China
| | - Yingguo Bai
- Key Laboratory for Feed Biotechnology of the Ministry of Agriculture, Feed Research Institute, Chinese Academy of Agricultural Sciences, Beijing 100081, PR China
| | - Bin Yao
- Key Laboratory for Feed Biotechnology of the Ministry of Agriculture, Feed Research Institute, Chinese Academy of Agricultural Sciences, Beijing 100081, PR China
| | - Tao Tu
- Key Laboratory for Feed Biotechnology of the Ministry of Agriculture, Feed Research Institute, Chinese Academy of Agricultural Sciences, Beijing 100081, PR China.
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Aulitto M, Fusco S, Limauro D, Fiorentino G, Bartolucci S, Contursi P. Galactomannan degradation by thermophilic enzymes: a hot topic for biotechnological applications. World J Microbiol Biotechnol 2019; 35:32. [DOI: 10.1007/s11274-019-2591-3] [Citation(s) in RCA: 25] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/21/2018] [Accepted: 01/10/2019] [Indexed: 01/06/2023]
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6
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Li J, Xu X, Shi P, Liu B, Zhang Y, Zhang W. Overexpression and characterization of a novel endo-β-1,3(4)-glucanase from thermophilic fungus Humicola insolens Y1. Protein Expr Purif 2017; 138:63-68. [DOI: 10.1016/j.pep.2015.11.011] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/15/2015] [Revised: 11/10/2015] [Accepted: 11/15/2015] [Indexed: 11/27/2022]
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Regmi S, Yoo HY, Choi YH, Choi YS, Yoo JC, Kim SW. Prospects for Bio-Industrial Application of an Extremely Alkaline Mannanase FromBacillus subtilissubsp.inaquosorumCSB31. Biotechnol J 2017; 12. [DOI: 10.1002/biot.201700113] [Citation(s) in RCA: 26] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/24/2017] [Revised: 08/22/2017] [Indexed: 11/12/2022]
Affiliation(s)
- Sudip Regmi
- Department of Pharmacy, Chosun University; 309, Pilmun-daero Dong-Gu Gwangju 61452 Republic of Korea
| | - Hah Y. Yoo
- Department of Biotechnology, Sangmyung University; 20, Hongjimun 2-Gil Jongno-Gu Seoul 03016 Republic of Korea
| | - Yun H. Choi
- Department of Pharmacy, Chosun University; 309, Pilmun-daero Dong-Gu Gwangju 61452 Republic of Korea
| | - Yoon S. Choi
- Department of Pharmacy, Chosun University; 309, Pilmun-daero Dong-Gu Gwangju 61452 Republic of Korea
| | - Jin C. Yoo
- Department of Pharmacy, Chosun University; 309, Pilmun-daero Dong-Gu Gwangju 61452 Republic of Korea
| | - Seung W. Kim
- Department of Chemical and Biological Engineering, Korea University; 145, Anam-Ro Seongbuk-Gu Seoul 02841 Republic of Korea
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Engineering a family 27 carbohydrate-binding module into an Aspergillus usamii β-mannanase to perfect its enzymatic properties. J Biosci Bioeng 2017; 123:294-299. [DOI: 10.1016/j.jbiosc.2016.09.009] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/08/2016] [Revised: 09/06/2016] [Accepted: 09/14/2016] [Indexed: 11/21/2022]
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Sakai K, Mochizuki M, Yamada M, Shinzawa Y, Minezawa M, Kimoto S, Murata S, Kaneko Y, Ishihara S, Jindou S, Kobayashi T, Kato M, Shimizu M. Biochemical characterization of thermostable β-1,4-mannanase belonging to the glycoside hydrolase family 134 from Aspergillus oryzae. Appl Microbiol Biotechnol 2017; 101:3237-3245. [DOI: 10.1007/s00253-017-8107-x] [Citation(s) in RCA: 35] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/15/2016] [Revised: 12/22/2016] [Accepted: 12/30/2016] [Indexed: 11/29/2022]
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10
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Enzymes and Nanoparticles Produced by Microorganisms and Their Applications in Biotechnology. Fungal Biol 2017. [DOI: 10.1007/978-3-319-68424-6_7] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
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11
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Ladevèze S, Laville E, Despres J, Mosoni P, Potocki-Véronèse G. Mannoside recognition and degradation by bacteria. Biol Rev Camb Philos Soc 2016; 92:1969-1990. [PMID: 27995767 DOI: 10.1111/brv.12316] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/16/2016] [Revised: 11/01/2016] [Accepted: 11/11/2016] [Indexed: 11/29/2022]
Abstract
Mannosides constitute a vast group of glycans widely distributed in nature. Produced by almost all organisms, these carbohydrates are involved in numerous cellular processes, such as cell structuration, protein maturation and signalling, mediation of protein-protein interactions and cell recognition. The ubiquitous presence of mannosides in the environment means they are a reliable source of carbon and energy for bacteria, which have developed complex strategies to harvest them. This review focuses on the various mannosides that can be found in nature and details their structure. It underlines their involvement in cellular interactions and finally describes the latest discoveries regarding the catalytic machinery and metabolic pathways that bacteria have developed to metabolize them.
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Affiliation(s)
- Simon Ladevèze
- LISBP, Université de Toulouse, CNRS, INRA, INSA, 31077, Toulouse, France
| | - Elisabeth Laville
- LISBP, Université de Toulouse, CNRS, INRA, INSA, 31077, Toulouse, France
| | - Jordane Despres
- INRA, UR454 Microbiologie, F-63122, Saint-Genès Champanelle, France
| | - Pascale Mosoni
- INRA, UR454 Microbiologie, F-63122, Saint-Genès Champanelle, France
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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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Characterization of a novel low-temperature-active, alkaline and sucrose-tolerant invertase. Sci Rep 2016; 6:32081. [PMID: 27553125 PMCID: PMC4995436 DOI: 10.1038/srep32081] [Citation(s) in RCA: 17] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/28/2016] [Accepted: 08/02/2016] [Indexed: 01/27/2023] Open
Abstract
A glycoside hydrolase family 32 invertase from Bacillus sp. HJ14 was expressed in Escherichia coli. The purified recombinant enzyme (rInvHJ14) showed typical biochemical properties of low-temperature-active and alkaline enzymes: (i) rInvHJ14 was active and stable in the range of pH 7.0–9.5 with an apparent pH optimum of 8.0; (ii) rInvHJ14 was most active but not stable at 30–32.5 °C, with 19.7, 48.2 and 82.1% of its maximum activity when assayed at 0, 10 and 20 °C, respectively, and the Ea, ΔG* (30 °C), Km (30 °C) and kcat (30 °C) values for hydrolysis of sucrose by rInvHJ14 was 47.6 kJ mol−1, 57.6 kJ mol−1, 62.9 mM and 746.2 s−1, respectively. The enzyme also showed strong sucrose tolerance. rInvHJ14 preserved approximately 50% of its highest activity in the presence of 2045.0 mM sucrose. Furthermore, potential factors for low-temperature-active and alkaline adaptations of rInvHJ14 were presumed. Compared with more thermostable homologs, rInvHJ14 has a higher frequency of glycine residues and a longer loop but a lower frequency of proline residues (especially in a loop) in the catalytic domain. The catalytic pockets of acid invertases were almost negatively charged while that of alkaline rInvHJ14 was mostly positively charged.
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Xu X, Li J, Shi P, Ji W, Liu B, Zhang Y, Yao B, Fan Y, Zhang W. The use of T-DNA insertional mutagenesis to improve cellulase production by the thermophilic fungus Humicola insolens Y1. Sci Rep 2016; 6:31108. [PMID: 27506519 PMCID: PMC4979032 DOI: 10.1038/srep31108] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/10/2016] [Accepted: 07/11/2016] [Indexed: 11/21/2022] Open
Abstract
Humicola insolens is an excellent producer of pH-neutral active, thermostable cellulases that find many industrial applications. In the present study, we developed an efficient Agrobacterium tumefaciens-mediated transformation system for H. insolens. We transformed plasmids carrying the promoter of the glyceraldehyde-3-phosphate dehydrogenase gene of H. insolens driving the transcription of genes encoding neomycin phosphotransferase, hygromycin B phosphotransferase, and enhanced green fluorescent protein. We optimized transformation efficiency to obtain over 300 transformants/106 conidia. T-DNA insertional mutagenesis was employed to generate an H. insolens mutant library, and we isolated a transformant termed T4 with enhanced cellulase and hemicellulase activities. The FPase, endoglucanase, cellobiohydrolase, β-glucosidase, and xylanase activities of T4, measured at the end of fermentation, were 60%, 440%, 320%, 41%, and 81% higher than those of the wild-type strain, respectively. We isolated the sequences flanking the T-DNA insertions and thus identified new genes potentially involved in cellulase and hemicellulase production. Our results show that it is feasible to use T-DNA insertional mutagenesis to identify novel candidate genes involved in cellulase production. This will be valuable when genetic improvement programs seeking to enhance cellulase production are planned, and will also allow us to gain a better understanding of the genetics of the thermophilic fungus H. insolens.
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Affiliation(s)
- Xinxin Xu
- Biotechnology Research Institute, Chinese Academy of Agricultural Sciences, Beijing 100081, China
| | - Jinyang Li
- Biotechnology Research Institute, Chinese Academy of Agricultural Sciences, Beijing 100081, China
| | - Pengjun Shi
- Key Laboratory of Feed Biotechnology of the Ministry of Agriculture, Feed Research Institute, Chinese Academy of Agricultural Sciences, Beijing 100081, China
| | - Wangli Ji
- Biotechnology Research Institute, Chinese Academy of Agricultural Sciences, Beijing 100081, China
| | - Bo Liu
- Biotechnology Research Institute, Chinese Academy of Agricultural Sciences, Beijing 100081, China
| | - Yuhong Zhang
- Biotechnology Research Institute, Chinese Academy of Agricultural Sciences, Beijing 100081, China
| | - Bin Yao
- Key Laboratory of Feed Biotechnology of the Ministry of Agriculture, Feed Research Institute, Chinese Academy of Agricultural Sciences, Beijing 100081, China
| | - Yunliu Fan
- Biotechnology Research Institute, Chinese Academy of Agricultural Sciences, Beijing 100081, China
| | - Wei Zhang
- Biotechnology Research Institute, Chinese Academy of Agricultural Sciences, Beijing 100081, China
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A multi-tolerant low molecular weight mannanase from Bacillus sp. CSB39 and its compatibility as an industrial biocatalyst. Enzyme Microb Technol 2016; 92:76-85. [PMID: 27542747 DOI: 10.1016/j.enzmictec.2016.06.018] [Citation(s) in RCA: 21] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/15/2015] [Revised: 05/17/2016] [Accepted: 06/28/2016] [Indexed: 11/22/2022]
Abstract
Bacillus sp. CSB39, isolated from popular traditional Korean food (Kimchi), produced a low molecular weight, thermostable mannanase (MnCSB39); 571.14U/mL using locust bean gum galactomannan as a major substrate. It was purified to homogeneity using a simple and effective two-step purification strategy, Sepharose CL-6B and DEAE Sepharose Fast Flow, which resulted in 25.47% yield and 19.32-fold purity. The surfactant-, NaCl-, urea-, and protease-tolerant monomeric protein had a mass of ∼30kDa as analyzed by SDS-PAGE and galactomannan zymography. MnCSB39 was found to have optimal activity at pH 7.5 and temperature of 70°C. The enzyme showed ˃55% activity at 5.0-15% (w/v) NaCl, and ˃93% of the initial activity after incubation at 37°C for 60min. Trypsin and proteinase K had no effect on MnCBS39. The enzyme showed ˃80% activity in up to 3M urea. The N-terminal amino acid sequence, ALKGDGX, did not show identity with reported mannanases, which suggests the novelty of our enzyme. Activation energy for galactomannan hydrolysis was 26.85kJmol(-1) with a Kcat of 142.58×10(4)s(-1). MnCSB39 had Km and Vmax values of 0.082mg/mL and 1099±1.0Umg(-1), respectively. Thermodynamic parameters such as ΔH, ΔG, ΔS, Q10, ΔGE-S, and ΔGE-T supported the spontaneous formation of products and the high hydrolytic efficiency and feasibility of the enzymatic reaction, which strengthen its novelty. MnCSB39 activity was affected by metal ions, modulators, chelators, and detergents. Mannobiose was the principal end-product of hydrolysis. Bacillus subtilis CSB39 produced a maximum of 1524.44U mannanase from solid state fermentation of 1g wheat bran. MnCSB39 was simple to purify, was active at a wide pH and temperature range, multi-stress tolerant and catalyzes a thermodynamically possible reaction, characteristics that suggests its suitability for application as an industrial biocatalyst.
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Wang R, Gong L, Xue X, Qin X, Ma R, Luo H, Zhang Y, Yao B, Su X. Identification of the C-Terminal GH5 Domain from CbCel9B/Man5A as the First Glycoside Hydrolase with Thermal Activation Property from a Multimodular Bifunctional Enzyme. PLoS One 2016; 11:e0156802. [PMID: 27258548 PMCID: PMC4892530 DOI: 10.1371/journal.pone.0156802] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/01/2015] [Accepted: 05/19/2016] [Indexed: 12/19/2022] Open
Abstract
Caldicellulosiruptor bescii encodes at least six unique multimodular glycoside hydrolases crucial for plant cell wall polysaccharides degradation, with each having two catalytic domains separated by two to three carbohydrate binding modules. Among the six enzymes, three have one N- or C-terminal GH5 domain with identical amino acid sequences. Despite a few reports on some of these multimodular enzymes, little is known about how the conserved GH5 domains behave, which are believed to be important due to the gene duplication. We thus cloned a representative GH5 domain from the C-terminus of a multimodular protein, i.e. the bifunctional cellulase/mannanase CbCel9B/Man5A which has been reported, and expressed it in Escherichia coli. Without any appending CBMs, the recombinant CbMan5A was still able to hydrolyze a variety of mannan substrates with different backbone linkages or side-chain decorations. While CbMan5A displayed the same pH optimum as CbCel9B/Man5A, it had an increased optimal temperature (90°C) and moreover, was activated by heating at 70°C and 80°C, a property not ever reported for the full-length protein. The turnover numbers of CbMan5A on mannan substrates were, however, lower than those of CbCel9B/Man5A. These data suggested that evolution of CbMan5A and the other domains into a single polypeptide is not a simple assembly; rather, the behavior of one module may be affected by the other ones in the full-length enzyme. The differential scanning calorimetry analysis further indicated that heating CbMan5A was not a simple transition state process. To the best knowledge of the authors, CbMan5A is the first glycoside hydrolase with thermal activation property identified from a multimodular bifunctional enzyme.
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Affiliation(s)
- Rong Wang
- Key Laboratory for Feed Biotechnology of the Ministry of Agriculture, Feed Research Institute, Chinese Academy of Agricultural Sciences, Beijing, 100081, P. R. China
- School of Life Sciences, Shanxi University, Taiyuan, Shanxi, 030006, P. R. China
| | - Li Gong
- Key Laboratory for Feed Biotechnology of the Ministry of Agriculture, Feed Research Institute, Chinese Academy of Agricultural Sciences, Beijing, 100081, P. R. China
- College of Animal Sciences, Zhejiang University, Hangzhou, 310058, P. R. China
| | - Xianli Xue
- Key Laboratory for Feed Biotechnology of the Ministry of Agriculture, Feed Research Institute, Chinese Academy of Agricultural Sciences, Beijing, 100081, P. R. China
| | - Xing Qin
- Key Laboratory for Feed Biotechnology of the Ministry of Agriculture, Feed Research Institute, Chinese Academy of Agricultural Sciences, Beijing, 100081, P. R. China
| | - Rui Ma
- Key Laboratory for Feed Biotechnology of the Ministry of Agriculture, Feed Research Institute, Chinese Academy of Agricultural Sciences, Beijing, 100081, P. R. China
| | - Huiying Luo
- Key Laboratory for Feed Biotechnology of the Ministry of Agriculture, Feed Research Institute, Chinese Academy of Agricultural Sciences, Beijing, 100081, P. R. China
| | - Yongjie Zhang
- School of Life Sciences, Shanxi University, Taiyuan, Shanxi, 030006, P. R. China
- * E-mail: (YZ); (BY); (XS)
| | - Bin Yao
- Key Laboratory for Feed Biotechnology of the Ministry of Agriculture, Feed Research Institute, Chinese Academy of Agricultural Sciences, Beijing, 100081, P. R. China
- * E-mail: (YZ); (BY); (XS)
| | - Xiaoyun Su
- Key Laboratory for Feed Biotechnology of the Ministry of Agriculture, Feed Research Institute, Chinese Academy of Agricultural Sciences, Beijing, 100081, P. R. China
- * E-mail: (YZ); (BY); (XS)
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Ahirwar S, Soni H, Rawat HK, Ganaie MA, Pranaw K, Kango N. Production optimization and functional characterization of thermostable β-mannanase from Malbranchea cinnamomea NFCCI 3724 and its applicability in mannotetraose (M4) generation. J Taiwan Inst Chem Eng 2016. [DOI: 10.1016/j.jtice.2016.03.033] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/16/2023]
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Wang X, Luo H, Yu W, Ma R, You S, Liu W, Hou L, Zheng F, Xie X, Yao B. A thermostable Gloeophyllum trabeum xylanase with potential for the brewing industry. Food Chem 2016; 199:516-23. [DOI: 10.1016/j.foodchem.2015.12.028] [Citation(s) in RCA: 28] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/22/2015] [Revised: 12/04/2015] [Accepted: 12/07/2015] [Indexed: 01/13/2023]
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Yatmaz E, Karahalil E, Germec M, Ilgin M, Turhan İ. Controlling filamentous fungi morphology with microparticles to enhanced β-mannanase production. Bioprocess Biosyst Eng 2016; 39:1391-9. [DOI: 10.1007/s00449-016-1615-8] [Citation(s) in RCA: 48] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/01/2016] [Accepted: 04/19/2016] [Indexed: 11/27/2022]
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20
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Biochemical characterization of an acidophilic β-mannanase from Gloeophyllum trabeum CBS900.73 with significant transglycosylation activity and feed digesting ability. Food Chem 2016; 197:474-81. [DOI: 10.1016/j.foodchem.2015.10.115] [Citation(s) in RCA: 23] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/17/2015] [Revised: 09/06/2015] [Accepted: 10/24/2015] [Indexed: 02/05/2023]
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Zhou J, Lu Q, Zhang R, Wang Y, Wu Q, Li J, Tang X, Xu B, Ding J, Huang Z. Characterization of two glycoside hydrolase family 36 α-galactosidases: Novel transglycosylation activity, lead–zinc tolerance, alkaline and multiple pH optima, and low-temperature activity. Food Chem 2016; 194:156-66. [DOI: 10.1016/j.foodchem.2015.08.015] [Citation(s) in RCA: 23] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/03/2015] [Revised: 08/03/2015] [Accepted: 08/05/2015] [Indexed: 11/24/2022]
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22
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Zhang R, Song Z, Wu Q, Zhou J, Li J, Mu Y, Tang X, Xu B, Ding J, Deng S, Huang Z. A novel surfactant-, NaCl-, and protease-tolerant β-mannanase from Bacillus sp. HJ14. Folia Microbiol (Praha) 2015; 61:233-42. [DOI: 10.1007/s12223-015-0430-y] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/24/2015] [Accepted: 10/15/2015] [Indexed: 01/18/2023]
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23
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Dhawan S, Singh R, Kaur R, Kaur J. A β-mannanase from Paenibacillus sp.: Optimization of production and its possible prebiotic potential. Biotechnol Appl Biochem 2015. [PMID: 26224294 DOI: 10.1002/bab.1419] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
Abstract
A thermotolerant bacterium Paenibacillus thiaminolyticus with an ability to produce extracellular β-mannanase was isolated from a soil sample. Bacterium produced 45 U/mL β-mannanase at 50 °C. The culture conditions for high-level production of β-mannanase were optimized. Optimized MS medium [wheat bran 2% (w/v), ammonium sulfate 0.3% (w/v), yeast extract, and peptone (0.025% each) pH 6.5] was inoculated with 2% of 16 H old culture. The culture was incubated at 50 °C for 48 H resulting in 24-folds higher β-mannanase production (1,100 ± 50 U/mL). Optimum pH and temperature for enzyme activity of the crude enzyme was 6.0 and 60 °C, respectively. The enzyme demonstrated 65% relative enzyme activity at 37 °C. The hydrolytic activity of the crude enzymatic preparation was assessed on various agro residues. Thin-layer chromatographic analysis showed that the enzyme activity to saccharify heteromannans resulted in production of a mixture of manno-oligosaccharides (MOS) and enzyme exhibited classic endo-activity. To evaluate the possible prebiotic potential of the MOS thus obtained, initial screening for their ability to support the growth of probiotics was carried out by the pure culture method. Bifidobacterium and Lactobacillus sp. responded positively to the addition of enzymatically derived oligosaccharides and their numbers increased significantly.
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Affiliation(s)
- Samriti Dhawan
- Department of Biotechnology, GGDSD College, Chandigarh, India
| | - Rajvinder Singh
- Department of Biotechnology, Panjab University, Chandigarh, India
| | - Ramandeep Kaur
- Department of Biotechnology, Guru Nanak Dev University, Amritsar, India
| | - Jagdeep Kaur
- Department of Biotechnology, Panjab University, Chandigarh, India.
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24
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Xu X, Li J, Zhang W, Huang H, Shi P, Luo H, Liu B, Zhang Y, Zhang Z, Fan Y, Yao B. A Neutral Thermostable β-1,4-Glucanase from Humicola insolens Y1 with Potential for Applications in Various Industries. PLoS One 2015; 10:e0124925. [PMID: 25909505 PMCID: PMC4409357 DOI: 10.1371/journal.pone.0124925] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/20/2014] [Accepted: 03/10/2015] [Indexed: 01/26/2023] Open
Abstract
We cloned a new glycoside hydrolase family 6 gene, Hicel6C, from the thermophilic fungus Humicola insolens Y1 and expressed it in Pichia pastoris. Using barley β-glucan as a substrate, recombinant HiCel6C protein exhibited neutral pH (6.5) and high temperature (70°C) optima. Distinct from most reported acidic fungal endo-β-1,4-glucanases, HiCel6C was alkali-tolerant, retaining greater than 98.0, 61.2, and 27.6% of peak activity at pH 8.0, 9.0, and 10.0, respectively, and exhibited good stability over a wide pH range (pH 5.0−11.0) and at temperatures up to 60°C. The Km and Vmax values of HiCel6C for barley β-glucan were 1.29 mg/mL and 752 μmol/min·mg, respectively. HiCel6C was strictly specific for the β-1,4-glucoside linkage exhibiting activity toward barley β-glucan, lichenan, and carboxy methylcellulose sodium salt (CMC-Na), but not toward laminarin (1,3-β-glucan). HiCel6C cleaved the internal glycosidic linkages of cellooligosaccharides randomly and thus represents an endo-cleaving enzyme. The predominant product of polysaccharide hydrolysis by HiCel6C was cellobiose, suggesting that it functions by an endo-processive mechanism. The favorable properties of HiCel6C make it a good candidate for basic research and for applications in the textile and brewing industries.
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Affiliation(s)
- Xinxin Xu
- Biotechnology Research Institute, Chinese Academy of Agricultural Sciences, Beijing 100081, China
| | - Jinyang Li
- Biotechnology Research Institute, Chinese Academy of Agricultural Sciences, Beijing 100081, China
| | - Wei Zhang
- Biotechnology Research Institute, Chinese Academy of Agricultural Sciences, Beijing 100081, China
- * E-mail: (WZ); (BY)
| | - Huoqing Huang
- Key Laboratory of Feed Biotechnology of the Ministry of Agriculture, Feed Research Institute, Chinese Academy of Agricultural Sciences, Beijing 100081, China
| | - Pengjun Shi
- Key Laboratory of Feed Biotechnology of the Ministry of Agriculture, Feed Research Institute, Chinese Academy of Agricultural Sciences, Beijing 100081, China
| | - Huiying Luo
- Key Laboratory of Feed Biotechnology of the Ministry of Agriculture, Feed Research Institute, Chinese Academy of Agricultural Sciences, Beijing 100081, China
| | - Bo Liu
- Biotechnology Research Institute, Chinese Academy of Agricultural Sciences, Beijing 100081, China
| | - Yuhong Zhang
- Biotechnology Research Institute, Chinese Academy of Agricultural Sciences, Beijing 100081, China
| | - Zhifang Zhang
- Biotechnology Research Institute, Chinese Academy of Agricultural Sciences, Beijing 100081, China
| | - Yunliu Fan
- Biotechnology Research Institute, Chinese Academy of Agricultural Sciences, Beijing 100081, China
| | - Bin Yao
- Key Laboratory of Feed Biotechnology of the Ministry of Agriculture, Feed Research Institute, Chinese Academy of Agricultural Sciences, Beijing 100081, China
- * E-mail: (WZ); (BY)
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Zhang R, Zhou J, Gao Y, Guan Y, Li J, Tang X, Xu B, Ding J, Huang Z. Molecular and biochemical characterizations of a new low-temperature active mannanase. Folia Microbiol (Praha) 2015; 60:483-92. [DOI: 10.1007/s12223-015-0391-1] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/23/2014] [Accepted: 04/01/2015] [Indexed: 10/23/2022]
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26
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Yang H, Shi P, Lu H, Wang H, Luo H, Huang H, Yang P, Yao B. A thermophilic β-mannanase from Neosartorya fischeri P1 with broad pH stability and significant hydrolysis ability of various mannan polymers. Food Chem 2015; 173:283-9. [DOI: 10.1016/j.foodchem.2014.10.022] [Citation(s) in RCA: 46] [Impact Index Per Article: 5.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/12/2014] [Revised: 10/02/2014] [Accepted: 10/05/2014] [Indexed: 11/27/2022]
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27
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Molecular characterization of a new alkaline-tolerant xylanase from Humicola insolens Y1. BIOMED RESEARCH INTERNATIONAL 2015; 2015:149504. [PMID: 25629035 PMCID: PMC4299769 DOI: 10.1155/2015/149504] [Citation(s) in RCA: 18] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 09/03/2014] [Accepted: 12/20/2014] [Indexed: 11/28/2022]
Abstract
An endo-1,4-β-xylanase-encoding gene, xyn11B, was cloned from the thermophilic fungus Humicola insolens Y1. The gene encodes a multimodular xylanase that consists of a typical hydrophobic signal sequence, a catalytic domain of glycoside hydrolase (GH) family 11, a glycine-rich linker, and a family 1 carbohydrate binding module (CBM1). Deduced Xyn11B shares the highest identity of 74% with a putative xylanase from Podospora anserina S mat+. Recombinant Xyn11B was successfully expressed in Pichia pastoris and purified to electrophoretic homogeneity. Xyn11B had a high specific activity of 382.0 U mg−1 towards beechwood xylan and showed optimal activity at pH 6.0 and 50°C. Distinct from most reported acidic fungal xylanases, Xyn11B was alkaline-tolerant, retaining 30.7% of the maximal activity at pH 9.0. The Km and Vmax values for beechwood xylan were 2.2 mg mL−1 and 462.8 μmol min−1 mg−1, respectively. The enzyme exhibited a wider substrate specificity and produced a mixture of xylooligosaccharides. All these favorable enzymatic properties make Xyn11B attractive for potential applications in various industries.
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Insights into the substrate specificity and synergy with mannanase of family 27 α-galactosidases from Neosartorya fischeri P1. Appl Microbiol Biotechnol 2014; 99:1261-72. [DOI: 10.1007/s00253-014-6269-3] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/18/2014] [Revised: 11/24/2014] [Accepted: 11/25/2014] [Indexed: 10/24/2022]
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29
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Biochemical characterization of a thermophilic β-mannanase from Talaromyces leycettanus JCM12802 with high specific activity. Appl Microbiol Biotechnol 2014; 99:1217-28. [DOI: 10.1007/s00253-014-5979-x] [Citation(s) in RCA: 35] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/11/2014] [Revised: 07/21/2014] [Accepted: 07/22/2014] [Indexed: 11/27/2022]
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30
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Yang X, Shi P, Huang H, Luo H, Wang Y, Zhang W, Yao B. Two xylose-tolerant GH43 bifunctional β-xylosidase/α-arabinosidases and one GH11 xylanase from Humicola insolens and their synergy in the degradation of xylan. Food Chem 2014; 148:381-7. [DOI: 10.1016/j.foodchem.2013.10.062] [Citation(s) in RCA: 63] [Impact Index Per Article: 6.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/07/2013] [Revised: 08/24/2013] [Accepted: 10/14/2013] [Indexed: 10/26/2022]
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31
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Wang J, Zeng D, Liu G, Wang S, Yu S. Truncation of a mannanase from Trichoderma harzianum improves its enzymatic properties and expression efficiency in Trichoderma reesei. J Ind Microbiol Biotechnol 2013; 41:125-33. [PMID: 24162722 DOI: 10.1007/s10295-013-1359-2] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/12/2013] [Accepted: 09/30/2013] [Indexed: 10/26/2022]
Abstract
To obtain high expression efficiency of a mannanase gene, ThMan5A, cloned from Trichoderma harzianum MGQ2, both the full-length gene and a truncated gene (ThMan5AΔCBM) that contains only the catalytic domain, were expressed in Trichoderma reesei QM9414 using the strong constitutive promoter of the gene encoding pyruvate decarboxylase (pdc), and purified to homogeneity, respectively. We found that truncation of the gene improved its expression efficiency as well as the enzymatic properties of the encoded protein. The recombinant strain expressing ThMan5AΔCBM produced 2,460 ± 45.1 U/ml of mannanase activity in the culture supernatant; 2.3-fold higher than when expressing the full-length ThMan5A gene. In addition, the truncated mannanase had superior thermostability compared with the full-length enzyme and retained 100 % of its activity after incubation at 60 °C for 48 h. Our results clearly show that the truncated ThMan5A enzyme exhibited improved characteristics both in expression efficiency and in its thermal stability. These characteristics suggest that ThMan5AΔCBM has potential applications in the food, feed, paper, and pulp industries.
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Affiliation(s)
- Juan Wang
- College of Life Science, Shenzhen Key Laboratory of Microbial Genetic Engineering, Shenzhen University, Shenzhen, 518060, Guangdong, People's Republic of China,
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Zhou H, Yang Y, Nie X, Yang W, Wu Y. Comparison of expression systems for the extracellular production of mannanase Man23 originated from Bacillus subtilis B23. Microb Cell Fact 2013; 12:78. [PMID: 24011469 PMCID: PMC3847498 DOI: 10.1186/1475-2859-12-78] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/12/2013] [Accepted: 09/04/2013] [Indexed: 11/10/2022] Open
Abstract
Background Mannanase is an enzyme that can catalyze random hydrolysis of beta-1,4-mannosidic linkages in the main chain of mannans, glucomannans and galactomannans which are the key polymers in hemicellulose. It has been used in a number of different industrial applications including food, feed, pharmaceutical, pulp/paper industries, and second generation biofuel. To optimize the expression system of mannanase Man23 gene, two kinds of vectors and host bacteria were determined and compared. Results Recombinants pHY-p43-man23 and pBPS-man23 were constructed and transferred into Bacillus subtilis WB600 and Brevibacillus brevis respectively. For mannanase Man23 gene, recombinant pHY-p43-man23 expressed in Brevibacillus brevis had higher production and activity. Compared to the wild-type Bacillus subtilis B23, the production of recombinant pHY-p43-man23 in B. brevis increased by 10 times and activity increased by 21.3%. pHY-p43-man23 in B. brevis had activity at the range of 20 ~ 70°C but its optimum temperature was 50°C and had activity from pH 4 ~ 10 but its optimum pH was around 7. This demonstrated the recombinant had improved stability as well. Conclusions Mannanase is an important industrial enzyme and combination of vector pHY-p43 and host Brevibacillus brevis is a novel expression system for a mannanase decoding gene. This work aims at exploring a better expression system of mannanase Man23 decoding gene for industrial application.
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Affiliation(s)
- Haiyan Zhou
- College of Bioscience and Biotechnology, Hunan Agricultural University, Changsha 410128, China.
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Nigam PS. Microbial enzymes with special characteristics for biotechnological applications. Biomolecules 2013; 3:597-611. [PMID: 24970183 PMCID: PMC4030947 DOI: 10.3390/biom3030597] [Citation(s) in RCA: 105] [Impact Index Per Article: 9.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/28/2013] [Revised: 08/06/2013] [Accepted: 08/15/2013] [Indexed: 01/09/2023] Open
Abstract
This article overviews the enzymes produced by microorganisms, which have been extensively studied worldwide for their isolation, purification and characterization of their specific properties. Researchers have isolated specific microorganisms from extreme sources under extreme culture conditions, with the objective that such isolated microbes would possess the capability to bio-synthesize special enzymes. Various Bio-industries require enzymes possessing special characteristics for their applications in processing of substrates and raw materials. The microbial enzymes act as bio-catalysts to perform reactions in bio-processes in an economical and environmentally-friendly way as opposed to the use of chemical catalysts. The special characteristics of enzymes are exploited for their commercial interest and industrial applications, which include: thermotolerance, thermophilic nature, tolerance to a varied range of pH, stability of enzyme activity over a range of temperature and pH, and other harsh reaction conditions. Such enzymes have proven their utility in bio-industries such as food, leather, textiles, animal feed, and in bio-conversions and bio-remediations.
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Affiliation(s)
- Poonam Singh Nigam
- Biomedical Science Research Institute, University of Ulster, Coleraine BT52 1SA, UK.
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34
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Lu H, Luo H, Shi P, Huang H, Meng K, Yang P, Yao B. A novel thermophilic endo-β-1,4-mannanase from Aspergillus nidulans XZ3: functional roles of carbohydrate-binding module and Thr/Ser-rich linker region. Appl Microbiol Biotechnol 2013; 98:2155-63. [DOI: 10.1007/s00253-013-5112-6] [Citation(s) in RCA: 31] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/01/2013] [Revised: 07/08/2013] [Accepted: 07/09/2013] [Indexed: 10/26/2022]
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35
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Du Y, Shi P, Huang H, Zhang X, Luo H, Wang Y, Yao B. Characterization of three novel thermophilic xylanases from Humicola insolens Y1 with application potentials in the brewing industry. BIORESOURCE TECHNOLOGY 2013; 130:161-167. [PMID: 23306124 DOI: 10.1016/j.biortech.2012.12.067] [Citation(s) in RCA: 50] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/26/2012] [Revised: 12/08/2012] [Accepted: 12/10/2012] [Indexed: 06/01/2023]
Abstract
Three xylanase genes (xynA, xynB, xynC) of glycosyl hydrolase family 10 were identified in Humicola insolens Y1. The deduced protein sequences showed the highest identity of ⩽83% to known fungal xylanases and of ⩽38% with each other. Recombinant XynA-C produced in Pichia pastoris showed optimal activities at pH 6.0-7.0 and at high temperature (70-80°C), and exhibited good stability over a broad pH range and temperatures at 60°C. The gene xynC produced by H. insolens Y1 (named XynW) was similar in enzyme properties with XynC expressed by Pichia. XynA exhibited better alkaline adaptation and thermostability, and had higher catalytic efficiency and wider substrate specificity. Under simulated mashing conditions, addition of XynA-C showed better performance on filtration acceleration (37.4%) and viscosity reduction (13.5%) than Ultraflo from Novozyme. Thus the three xylanases represent good candidates for application in the brewing industry.
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Affiliation(s)
- Yanlong Du
- Key Laboratory for Feed Biotechnology of the Ministry of Agriculture, Feed Research Institute, Chinese Academy of Agricultural Sciences, Beijing 100081, PR China
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36
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Katrolia P, Yan Q, Zhang P, Zhou P, Yang S, Jiang Z. Gene cloning and enzymatic characterization of an alkali-tolerant endo-1,4-β-mannanase from Rhizomucor miehei. JOURNAL OF AGRICULTURAL AND FOOD CHEMISTRY 2013; 61:394-401. [PMID: 23252695 DOI: 10.1021/jf303319h] [Citation(s) in RCA: 44] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/28/2023]
Abstract
An endo-1,4-β-mannanase gene (RmMan5A) was cloned from the thermophilic fungus Rhizomucor miehei for the first time and expressed in Escherichia coli . The gene had an open reading frame of 1330 bp encoding 378 amino acids and contained four introns. It displayed the highest amino acid sequence identity (42%) with the endo-1,4-β-mannanases from glycoside hydrolase family 5. The purified enzyme was a monomer of 43 kDa. RmMan5A displayed maximum activity at 55 °C and an optimal pH of 7.0. It was thermostable up to 55 °C and alkali-tolerant, displaying excellent stability over a broad pH range of 4.0-10.0, when incubated for 30 min without substrate. The enzyme displayed the highest specificity for locust bean gum (K(m) = 3.78 mg mL⁻¹), followed by guar gum (K(m) = 7.75 mg mL⁻¹) and konjac powder (K(m) = 22.7 mg mL⁻¹). RmMan5A hydrolyzed locust bean gum and konjac powder yielding mannobiose, mannotriose, and a mixture of various mannose-linked oligosaccharides. It was confirmed to be a true endo-acting β-1,4-mannanase, which showed requirement of four mannose residues for hydrolysis, and was also capable of catalyzing transglycosylation reactions. These properties make RmMan5A highly useful in the food/feed, paper and pulp, and detergent industries.
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Affiliation(s)
- Priti Katrolia
- Department of Biotechnology, College of Food Science and Nutritional Engineering, China Agricultural University, Beijing 100083, People's Republic of China
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37
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Lu H, Zhang H, Shi P, Luo H, Wang Y, Yang P, Yao B. A family 5 β-mannanase from the thermophilic fungus Thielavia arenaria XZ7 with typical thermophilic enzyme features. Appl Microbiol Biotechnol 2013; 97:8121-8. [DOI: 10.1007/s00253-012-4656-1] [Citation(s) in RCA: 26] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/10/2012] [Revised: 12/12/2012] [Accepted: 12/15/2012] [Indexed: 10/27/2022]
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