华北农学报 ›› 2006, Vol. 21 ›› Issue (S3): 22-26. doi: 10.7668/hbnxb.2006.S3.005

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甜蛋白大肠杆菌工程菌株发酵条件的优化及重组蛋白纯化方法的研究

陈忠军1, 蔡恒2, 路福平3, 李正英4, 杨志华1   

  1. 1. 内蒙古农业大学食品科学与工程学院, 内蒙古呼和浩特010018;
    2. 南京工业大学制药与生命科学学院, 江苏南京210009;
    3. 天津科技大学生物工程学院, 天津300222;
    4. 内蒙古农业大学职业技术学院, 内蒙古包头014109
  • 收稿日期:2006-11-14 出版日期:2006-12-31
  • 作者简介:陈忠军(1971-), 女, 内蒙古呼和浩特人, 副教授, 博士, 主要从事食品科学研究与教学工作。
  • 基金资助:
    内蒙古自然科学基金(NO2006070105190)

Research of Fermentation Condition and Purification of Monellin in the Recombinant E.coli Stain

CHEN Zhong-jun1, CAI Heng2, LU Fu-ping3, LI Zheng-ying4, YANG Zhi-hua1   

  1. 1. College of Food Science and Engineering Inner Mongolia Agricultural University, Huhhot 010018, China;
    2. College of Life Science and Pharmaccutical Engineering Nanjing University of Technology, Nanjing 210009, China;
    3. College of Biotechnology Tianjin University of Science & Technology, Tianjin 300222, China;
    4. Food Department of Vocational Technology College of Inner Mengolia Agricultural University, Baotou 014109, China
  • Received:2006-11-14 Published:2006-12-31

摘要: 将带有monellin基因的重组分泌型表达载体pETMO转入大肠杆菌BL21(DE3)。得到重组工程菌株BLC01。研究不同的表达条件对甜蛋白表达水平的影响, 得到优化发酵条件:装液量为50ml/250ml三角瓶, 当培养液OD值达0.8时, 添加诱导剂IPTG至浓度为0.9mM, 32℃诱导5h。此时, 甜蛋白monellin表达量可高达细菌可溶性蛋白的45.2%。超声破碎细胞后, 利用热处理和酸处理结合的方法有效去除宿主蛋白, 透析后利用Sephadex G- 50进行柱层析, 得到纯化重组甜蛋白monellin。monellin基因在重组大肠杆菌中的表达产物具有生物活性。

关键词: 甜蛋白monellin, 重组菌株, 发酵条件, 纯化

Abstract: A expression vector pETMO harboring the single-chain monellin gene was transferred into E.coli BL21(DE3).In this study, the optimal condition of fermentation was obtained. The recombinant E.coli was grown at 37℃with shaking at 200 rpm. When OD600nm of the culture reached 0.8, IPTG was added to give a final concentration of 0.9 mM, and then incubated at 32℃for 5 h to over-express the recombinant monellin. Monellin was produced accounting for 45.2% of total soluble proteins. After broken up by ultrasonic the cell was treated by acid and heating to remove effectively the protein of host, the liquid was dialyzed and then sublimated by Sephadex G-50 to obtain pure monellin. The E. coli-expressed monellin has active.

Key words: Sweet protein monellin, Recombinant strain, Conditions of fermentation, Purification

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引用本文

陈忠军, 蔡恒, 路福平, 李正英, 杨志华. 甜蛋白大肠杆菌工程菌株发酵条件的优化及重组蛋白纯化方法的研究[J]. 华北农学报, 2006, 21(S3): 22-26. doi: 10.7668/hbnxb.2006.S3.005.

CHEN Zhong-jun, CAI Heng, LU Fu-ping, LI Zheng-ying, YANG Zhi-hua. Research of Fermentation Condition and Purification of Monellin in the Recombinant E.coli Stain[J]. ACTA AGRICULTURAE BOREALI-SINICA, 2006, 21(S3): 22-26. doi: 10.7668/hbnxb.2006.S3.005.

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