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Xiaowen W, Sibo C, Lin F, Hao L, Si C, Xianfeng Y, Zhoukun L, Zhongli C, Huang Y. Characterization of a halotolerant GH2 family β-galactosidase GalM from Microvirga sp. strain MC18. Protein Expr Purif 2022; 194:106074. [PMID: 35218889 DOI: 10.1016/j.pep.2022.106074] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/10/2022] [Revised: 02/19/2022] [Accepted: 02/21/2022] [Indexed: 11/29/2022]
Abstract
A new glycoside hydrolase family 2 (GH2) β-galactosidase encoding gene galM was cloned from Microvirga sp. strain MC18 and overexpressed in Escherichia coli. The recombinant β-galactosidase GalM showed optimal activity at pH 7.0 and 50 °C, with a stability at pH 6.0-9.0 and 20-40 °C, which are conditions suitable for the diary environment. The Km and Vmax values for o-nitrophenyl-β-d-galactopyranoside (oNPG) were 1.30 mmol/L and 15.974 μmol/(min·mg), respectively. GalM showed low product inhibition by galactose with a Ki of 73.18 mM and high tolerance for glucose that 86.5% activity retained in the presence of 500 mM glucose. It was also stable and active in 20% of methanol, ethanol and isopropanol. In addition, the enzyme activity of GalM was activated significantly over 0-2 mol/L NaCl (1.6-4.3 fold). These favorable properties make GalM a potential candidate for the industrial application.
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Affiliation(s)
- Wang Xiaowen
- Key Laboratory of Agricultural Environmental Microbiology, Ministry of Agriculture and Rural Affairs, College of Life Sciences, Nanjing Agricultural University, Nanjing, 210095, PR China
| | - Chen Sibo
- Key Laboratory of Agricultural Environmental Microbiology, Ministry of Agriculture and Rural Affairs, College of Life Sciences, Nanjing Agricultural University, Nanjing, 210095, PR China
| | - Fan Lin
- Key Laboratory of Agricultural Environmental Microbiology, Ministry of Agriculture and Rural Affairs, College of Life Sciences, Nanjing Agricultural University, Nanjing, 210095, PR China
| | - Liu Hao
- Key Laboratory of Agricultural Environmental Microbiology, Ministry of Agriculture and Rural Affairs, College of Life Sciences, Nanjing Agricultural University, Nanjing, 210095, PR China
| | - Chen Si
- Key Laboratory of Agricultural Environmental Microbiology, Ministry of Agriculture and Rural Affairs, College of Life Sciences, Nanjing Agricultural University, Nanjing, 210095, PR China
| | - Ye Xianfeng
- Key Laboratory of Agricultural Environmental Microbiology, Ministry of Agriculture and Rural Affairs, College of Life Sciences, Nanjing Agricultural University, Nanjing, 210095, PR China
| | - Li Zhoukun
- Key Laboratory of Agricultural Environmental Microbiology, Ministry of Agriculture and Rural Affairs, College of Life Sciences, Nanjing Agricultural University, Nanjing, 210095, PR China
| | - Cui Zhongli
- Key Laboratory of Agricultural Environmental Microbiology, Ministry of Agriculture and Rural Affairs, College of Life Sciences, Nanjing Agricultural University, Nanjing, 210095, PR China
| | - Yan Huang
- Key Laboratory of Agricultural Environmental Microbiology, Ministry of Agriculture and Rural Affairs, College of Life Sciences, Nanjing Agricultural University, Nanjing, 210095, PR China.
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Chengyao X, Yan Q, Chaonan D, Xiaopei C, Yanxin W, Ding L, Xianfeng Y, Jian H, Yan H, Zhongli C, Zhoukun L. Enzymatic properties of an efficient glucan branching enzyme and its potential application in starch modification. Protein Expr Purif 2020; 178:105779. [PMID: 33115653 DOI: 10.1016/j.pep.2020.105779] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/22/2020] [Revised: 09/02/2020] [Accepted: 10/21/2020] [Indexed: 11/29/2022]
Abstract
Glucan branching enzymes (GBEs, EC 2.4.1.18) catalyze the formation of α-1,6-linked branch in starch, which is important for the starch modification with prospective properties. In this study, the aqGBE gene encoding an efficient glucan branching enzyme was cloned from Aquabacterium sp. strain A7-Y and successfully expressed in Escherichia coli BL21 (DE3). The specific activity of the purified recombinant enzyme rAqGBE was 2850 U/mg with potato starch as the optimal substrate, and the Km and Vmax values of rAqGBE were 1.18 mg/mL and 588.2 μmol/min/mg, respectively. Enzymological characterization showed that rAqGBE exhibits its optimal activity under the condition of 40 °C and pH 7.0, respectively, which is independent of calcium ions. Otherwise, rAqGBE-treated potato starch showed different chain length distribution compared with control, the numbers of short chains (degree of polymerization, DP < 7) and long chains (DP > 25) increased from 4.5% to 9.6% and 6.1%-15.7% after enzymatic treatment, respectively. In starch anti-ageing assay, with minimum usage of 0.8 mg rAqGBE per g starch, the rAqGBE-treated potato starch exhibited reduced retrogradation properties. Our results indicate that the branching enzyme AqGBE may therefore be a promising tool for the enzymatic modification of starch.
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Affiliation(s)
- Xia Chengyao
- Key Laboratory of Agricultural Environmental Microbiology, Ministry of Agriculture, College of Life Science, Nanjing Agricultural University, Nanjing, 210095, PR China
| | - Qiao Yan
- Key Laboratory of Agricultural Environmental Microbiology, Ministry of Agriculture, College of Life Science, Nanjing Agricultural University, Nanjing, 210095, PR China
| | - Dong Chaonan
- Key Laboratory of Agricultural Environmental Microbiology, Ministry of Agriculture, College of Life Science, Nanjing Agricultural University, Nanjing, 210095, PR China
| | - Chen Xiaopei
- Key Laboratory of Agricultural Environmental Microbiology, Ministry of Agriculture, College of Life Science, Nanjing Agricultural University, Nanjing, 210095, PR China
| | - Wang Yanxin
- Key Laboratory of Agricultural Environmental Microbiology, Ministry of Agriculture, College of Life Science, Nanjing Agricultural University, Nanjing, 210095, PR China
| | - Li Ding
- Institute of Veterinary Immunology &Engineering, Jiangsu Academy of Agricultural Sciences, Nanjing, 210014, PR China
| | - Ye Xianfeng
- Key Laboratory of Agricultural Environmental Microbiology, Ministry of Agriculture, College of Life Science, Nanjing Agricultural University, Nanjing, 210095, PR China
| | - Han Jian
- College of Agriculture, Xinjiang Agricultural University, XinJiang, 830052, China
| | - Huang Yan
- Key Laboratory of Agricultural Environmental Microbiology, Ministry of Agriculture, College of Life Science, Nanjing Agricultural University, Nanjing, 210095, PR China
| | - Cui Zhongli
- Key Laboratory of Agricultural Environmental Microbiology, Ministry of Agriculture, College of Life Science, Nanjing Agricultural University, Nanjing, 210095, PR China
| | - Li Zhoukun
- Key Laboratory of Agricultural Environmental Microbiology, Ministry of Agriculture, College of Life Science, Nanjing Agricultural University, Nanjing, 210095, PR China.
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Yajuan Z, Yajuan D, Lingli Z, Zhoukun L, Zhongli C, Yan H. Characterization of a novel aldo-keto reductase with anti-Prelog stereospecificity from Corallococcus sp. EGB. Int J Biol Macromol 2020; 146:36-44. [DOI: 10.1016/j.ijbiomac.2019.12.214] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/03/2019] [Revised: 12/03/2019] [Accepted: 12/24/2019] [Indexed: 11/26/2022]
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Zhoukun L, Wenwen Z, Lei Z, Yanxin W, Yajuan Z, Yan Q, Xue L, Yan H, Zhongli C. Gene Expression and Biochemical Characterization of a GH77 4‐α‐Glucanotransferase CcGtase FromCorallococcussp. EGB. STARCH-STARKE 2019. [DOI: 10.1002/star.201800254] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
Affiliation(s)
- Li Zhoukun
- Key Laboratory of Agricultural Environmental MicrobiologyMinistry of AgricultureCollege of Life ScienceNanjing Agricultural UniversityNanjing 210095P. R. China
| | - Zheng Wenwen
- Key Laboratory of Agricultural Environmental MicrobiologyMinistry of AgricultureCollege of Life ScienceNanjing Agricultural UniversityNanjing 210095P. R. China
| | - Zhang Lei
- Key Laboratory of Agricultural Environmental MicrobiologyMinistry of AgricultureCollege of Life ScienceNanjing Agricultural UniversityNanjing 210095P. R. China
| | - Wang Yanxin
- Key Laboratory of Agricultural Environmental MicrobiologyMinistry of AgricultureCollege of Life ScienceNanjing Agricultural UniversityNanjing 210095P. R. China
| | - Zhang Yajuan
- Key Laboratory of Agricultural Environmental MicrobiologyMinistry of AgricultureCollege of Life ScienceNanjing Agricultural UniversityNanjing 210095P. R. China
| | - Qiao Yan
- Key Laboratory of Agricultural Environmental MicrobiologyMinistry of AgricultureCollege of Life ScienceNanjing Agricultural UniversityNanjing 210095P. R. China
| | - Luo Xue
- Key Laboratory of Agricultural Environmental MicrobiologyMinistry of AgricultureCollege of Life ScienceNanjing Agricultural UniversityNanjing 210095P. R. China
| | - Huang Yan
- Key Laboratory of Agricultural Environmental MicrobiologyMinistry of AgricultureCollege of Life ScienceNanjing Agricultural UniversityNanjing 210095P. R. China
| | - Cui Zhongli
- Key Laboratory of Agricultural Environmental MicrobiologyMinistry of AgricultureCollege of Life ScienceNanjing Agricultural UniversityNanjing 210095P. R. China
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Zhoukun L, Jiale W, Ting W, Wenwen Z, Yan Q, Yan H, Zhongli C. Efficient Production and Characterization of Maltohexaose-Forming α-Amylase AmyM Secreted From the Methylotrophic YeastPichia pastoris. STARCH-STARKE 2018. [DOI: 10.1002/star.201700312] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
Affiliation(s)
- Li Zhoukun
- Key Laboratory of Agricultural Environmental Microbiology; Ministry of Agriculture; College of Life Science; Nanjing Agricultural University; Nanjing 210095 P.R. China
| | - Wu Jiale
- Key Laboratory of Agricultural Environmental Microbiology; Ministry of Agriculture; College of Life Science; Nanjing Agricultural University; Nanjing 210095 P.R. China
| | - Wang Ting
- Key Laboratory of Agricultural Environmental Microbiology; Ministry of Agriculture; College of Life Science; Nanjing Agricultural University; Nanjing 210095 P.R. China
| | - Zheng Wenwen
- Key Laboratory of Agricultural Environmental Microbiology; Ministry of Agriculture; College of Life Science; Nanjing Agricultural University; Nanjing 210095 P.R. China
| | - Qiao Yan
- Key Laboratory of Agricultural Environmental Microbiology; Ministry of Agriculture; College of Life Science; Nanjing Agricultural University; Nanjing 210095 P.R. China
| | - Huang Yan
- Key Laboratory of Agricultural Environmental Microbiology; Ministry of Agriculture; College of Life Science; Nanjing Agricultural University; Nanjing 210095 P.R. China
| | - Cui Zhongli
- Key Laboratory of Agricultural Environmental Microbiology; Ministry of Agriculture; College of Life Science; Nanjing Agricultural University; Nanjing 210095 P.R. China
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Abstract
A degradative bacterium, M6, was isolated and presumptively identified as Plesiomonas sp. strain M6 was able to hydrolyze methyl parathion to p-nitrophenol. A novel organophosphate hydrolase gene designated mpd was selected from its genomic library prepared by shotgun cloning. The nucleotide sequence of the mpd gene was determined. The gene could be effectively expressed in Escherichia coli.
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Affiliation(s)
- C Zhongli
- Department of Microbiology, Nanjing Agricultural University, Nanjing, Jiangsu Province 210095, People's Republic of China
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