生物技术通报 ›› 2018, Vol. 34 ›› Issue (7): 174-179.doi: 10.13560/j.cnki.biotech.bull.1985.2017-1095

• 研究报告 • 上一篇    下一篇

共表达分子伴侣PDI和Ero1对葡萄糖氧化酶在毕赤酵母中表达的影响

高庆华1, 董聪1, 王玥1, 胡美荣2, 王庆庆1, 王云鹏1, 罗同阳1, 刘蕾1   

  1. 1. 河北省微生物研究所,保定 071051;
    2. 中国科学院微生物研究所,北京 100101
  • 收稿日期:2017-12-21 出版日期:2018-07-26 发布日期:2018-08-01
  • 作者简介:高庆华,男,博士,研究方向:微生物发酵技术;E-mail:gaoqinghua_mbb@126.com
  • 基金资助:
    河北省科技计划项目(16292903D),河北省科学院科技计划项目(161312)

Enhancement of Glucose Oxidase in Pichia pastoris by Co-expressing Chaperone PDI and Ero1

GAO Qing-hua1, DONG Cong1, WANG Yue1, HU Mei-rong2, WANG Qing-qing1, WANG Yun-peng1, LUO Tong-yang1, LIU Lei1   

  1. 1. Institute of Microbiology,Hebei Academy of Sciences,Baoding 071051;
    2. Institute of Microbiology,Chinese Academy of Sciences,Beijing 100101
  • Received:2017-12-21 Published:2018-07-26 Online:2018-08-01

摘要: 通过单独表达蛋白质分子伴侣二硫键异构酶(PDI)和共表达PDI和内质网氧化还原酶(Ero1),提高重组葡萄糖氧化酶在毕赤酵母中的分泌表达。将构建的蛋白质分子伴侣表达载体pPICZ/PDI和pPICZ/Ero1-PDI线性化后,电击转化重组毕赤酵母X33/pMD-GOD 细胞,用含有250 μg/mL G418和50 μg/mL Zeocin的YPD双抗平板筛选阳性转化子,阳性转化子进行试管发酵和10 L发酵培养后,分析共表达PDI和Ero1-PDI 对GOD 表达水平的影响。结果显示,共表达PDI及Ero1-PDI 分别使葡萄糖氧化酶在10 L发酵罐中30℃培养,酶活分别达到476 U/mL 和736 U/mL,相比原始菌株在相同条件下分别提高了29.7%和100%。整合分子伴侣PDI和Ero1促进蛋白正确折叠明显地提高葡萄糖氧化酶蛋白表达。

关键词: 葡萄糖氧化酶, 分子伴侣, 蛋白表达, 毕赤酵母

Abstract: The expression of recombinant glucose oxidase(GOD)in Pichia pastoris was enhanced by the sole expression of protein chaperones protein disulfide isomerase(PDI)as well as the co-expression of endoplasmic reticulum oxidoreductase 1(Ero1)and PDI. The pPICZ/PDI and pPICZ/PDI -Ero1expression plasmids were linearized and integrated into the genome of P. pastoris X33/pMD-GOD by electroporation. The positive transformants were screened with double-resistance plate of 250 μg/mL G418 and 50 μg/mL Zeocin. The positive transformants were fermented in tube and 10 L fermenter for analyzing the effects of co-expressing PDI and Ero1-PDI on the expression of GOD. The results revealed that co-expression of PDI and Ero1-PDI increased GOD activity by 29.7% and 100% and their activity reached 476 U/m L and 736 U/m L respectively in 10 L fermenter at 30℃,compared with the control type of original strain. Conclusively,the integration of chaperone PDI and Ero1 enhanced the correct folding of GOD and significantly increased the expression of GOD.

Key words: glucose oxidase, chaperone, protein expression, Pichia pastoris