High-level Expression of a Manganese Superoxide Dismutase (PoMn-SOD) from Pleurotus ostreatus in Pichia pastoris
文献类型: 外文期刊
作者: Yin, Chaomin 1 ; Zhao, Wenxia 1 ; Zheng, Liesheng 2 ; Chen, Liguo 2 ; Tan, Qi 3 ; Shang, Xiaodong 3 ; Ma, Aimin 1 ;
作者机构: 1.Huazhong Agr Univ, Coll Food Sci & Technol, Key Lab Agromicrobial Resources & Utilizat, Minist Agr, Wuhan 430070, Peoples R China
2.Huazhong Agr Univ, Coll Plant Sci & Technol, Wuhan 430070, Peoples R China
3.Shanghai Acad Agr Sci, Natl Res Ctr Edible Fungi Biotechnol & Engn, Shanghai Key Lab Agr Genet & Breeding,Inst Edible, Key Lab Appl Mycol Resources & Utilizat,Minist Ed, Shanghai 201403, Peoples R China
关键词: Pleurotus ostreatus;Manganese superoxide dismutase (PoMn-SOD);Pichia pastoris;Expression;Optimizedcultureparameters;Polyacrylamidegelelectrophoresis(PAGE)
期刊名称:APPLIED BIOCHEMISTRY AND BIOTECHNOLOGY ( 影响因子:2.926; 五年影响因子:2.685 )
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收录情况: SCI
摘要: The full-length cDNA of Pleurotus ostreatus superoxide dismutase (PoMn-SOD) was cloned and successfully expressed by using the pPIC9K vector under the control of alcohol oxidase 1 promoter with a secretion signal peptide (α-factor) in Pichia pastoris. Sodium dodecyl sulfate-polyacrylamide gel electrophoresis (SDS-PAGE) andWestern blotting demonstrated that recombinant PoMn-SOD, a 21.8 kDa protein, was secreted into the culture medium. Nondenaturing PAGE experiments confirmed that recombinant PoMn-SOD was secreted in a functionally active form and the expression system did not require any acid activation process. The factors affecting the expression level were optimized in shaking flask cultures. The maximum enzyme activity (156.9 U/mg) was observed under the following conditions: Initial medium pH was 6.0, induction time point was at the 6th day, and methanol concentration was 0.7 % (v/v). This was the first report on secretory expression of recombinant PoMn-SOD in P. pastoris, which might provide a reference for further practical applications.
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