食品科学 ›› 2010, Vol. 31 ›› Issue (9): 171-176.doi: 10.7506/spkx1002-6630-201009039

• 生物工程 • 上一篇    下一篇

抗黄曲霉毒素B1单链抗体的表达载体的比较

杨 炼,刘自琴,刘 蓉,陈海琴,陈 卫,张 灏*   

  1. 江南大学食品学院,食品科学与技术国家重点实验室
  • 收稿日期:2009-10-28 修回日期:2010-03-11 出版日期:2010-05-01 发布日期:2010-12-29
  • 通讯作者: 张灏 E-mail:zhanghao@jiangnan.edu.cn
  • 基金资助:

    教育部新世纪人才计划资助项目(NCET-06-0482)

Comparison of pET Vectors for the Expression of Single Chain Antibody for Aflatoxin B1

YANG Lian,LIU Zi-qin,LIU Rong,CHEN Hai-qin,CHEN Wei,ZHANG Hao*   

  1. State Key Laboratory of Food Science and Technology, School of Food Science and Technology,
    Jiangnan University, Wuxi 214122, China
  • Received:2009-10-28 Revised:2010-03-11 Online:2010-05-01 Published:2010-12-29

摘要:

目的:比较4 种不同的pET 载体在表达抗黄曲霉毒素B1(AFB1)的单链抗体(scFv)克隆的特点,确定用以表达scFv-H4 的合适载体。方法:将目的基因H4 分别克隆到载体pET20b、pET22b、pET28a 和pET32a 上,分别转入大肠杆菌BL21(DE3)或Origami(DE3)中,比较诱导过程中细胞的生长状况和诱导结束后细胞破碎液中scFv-H4的生物活性以及细胞各部分包涵体。结果:pET20b 和pET22b 能表达具有生物活性的scFv-H4,这些具有生物活性的蛋白主要存在于周质中;pET28a 和pET32a 不能表达有生物活性的scFv-H4,而pET32a 仅能在细胞质中产生大量的包涵体。结论:pET22b 可能是表达AFB1 的单链抗体较优的表达载体。

关键词: 黄曲霉毒素, 单链抗体, 表达, 大肠杆菌, pET

Abstract:

Objective: Recombinant antibody expression in microorganism greatly facilitated the affinity and stability studies of recombinant antibodies, but previous studies had less reports about the selection of vectors. A suitable expression vector is important during the expression of the single chain antibody (scFv-H4) for aflatoxin B1. Methods: Four pET vectors such as pET20b, pET22b, pET28a and pET32a were employed in the functional expression of scFv-H4. Results: pET20b and pET22b vectors were able to express the functional antibody in periplasm. The vector of pET28a was not suitable for the expression of scFv-H4 due to lack of detectable scFv-H4 in total protein. Moreover, the detectable scFv-H4 was only expressed in inclusion body through pET32a expression system. Conclusion: pET22b was an excellent vector for the expression of scFv-H4, which might be a good reference for similar protein expression and be useful in the later study of scFv-H4 affinity and stability.

Key words: aflatoxin, single chain fragment, expression, Escherichia coli, pET

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