食品科学 ›› 2018, Vol. 39 ›› Issue (12): 179-184.doi: 10.7506/spkx1002-6630-201812028

• 生物工程 • 上一篇    下一篇

β2肾上腺素受体基因的改造及在无细胞合成体系中的表达

王健1,2,刘媛1,2,王玮1,刘洋1,韩正政1,曲丽洁2,杨立亭2,王若敏2   

  1. (1.河北北方学院食品安全研究中心,河北省农产品食品质量安全分析检测重点实验室,河北?张家口 075000;2.河北北方学院农林科技学院食品研究所,河北?张家口 075000)
  • 出版日期:2018-06-25 发布日期:2018-06-15
  • 基金资助:
    河北省高等学校科学技术研究青年基金项目(QN2018264);河北北方学院博士科研启动基金项目(201706)

Gene Modification and Expression of β2 Adrenergic Receptor in a Cell-Free Protein Synthesis System

WANG Jian1,2, LIU Yuan1,2, WANG Wei1, LIU Yang1, HAN Zhengzheng1, QU Lijie2, YANG Liting2, WANG Ruomin2   

  1. (1. Hebei Key Laboratory of Quality & Safety Analysis-Testing for Agro-Products and Food, Food Safety Research Center, Hebei North University, Zhangjiakou 075000, China; 2. Institute of Food Science, College of Agriculture and Forestry Science and Technology, Hebei North University, Zhangjiakou 075000, China)
  • Online:2018-06-25 Published:2018-06-15

摘要: 依据大肠杆菌密码子偏好性,设计合成β2肾上腺素受体(β2 adrenergic receptor,β2AR)基因序列,应用大肠杆菌无细胞系统对其进行高效表达,经负载镍离子的顺磁颗粒MagneHis? Ni-Particles纯化后,对受体蛋白进行十二烷基硫酸钠-聚丙烯酰胺凝胶电泳(sodium dodecyl sulfate-polyacrylamide gel electrophoresis,SDS-PAGE)和活性鉴定。结果表明:改造后的β2AR基因密码子适应指数(codon adaptation index,CAI)为0.96,GC含量从58%降低到46.17%,更有利于该基因在大肠杆菌系统中的表达。表达体系中优化后的Mg2+浓度为22?mmol/L,此时表达量为1 250 μg/mL。SDS-PAGE分析显示,纯化蛋白在47?kDa左右出现清晰的特异性条带,与预期结果一致,纯度大于90%。直接酶受体分析检测结果显示,当纯化受体蛋白1∶500稀释包被时,该重组受体与盐酸克伦特罗、沙丁胺醇及莱克多巴胺的酶标记物结合的OD值分别为0.976、0.836和0.728,亲和活性依次降低。β2AR蛋白在无细胞体系中的成功表达,为研发基于受体的β激动剂多残留快速检测技术提供了理论支持。

关键词: β2肾上腺素受体, 密码子优化, 大肠杆菌无细胞合成体系, 表达, β激动剂检测

Abstract: According to the codon preference of Escherichia coli, the β2 adrenergic receptor (β2AR) gene sequence was designed and synthesized. Then the E. coli-based cell-free protein synthesis (CFPS) system and MagneHis? Ni-Particles were used for efficient expression and purification. The purified receptor was identified by SDS-PAGE analysis and enzyme-linked receptor assays (ELRA). The results indicated that the codon adaptation index (CAI) of the optimized β2AR gene was 0.96 and its GC content was decreased from 58% to 46.17%, favoring its expression in E. coli. The optimal Mg2+ concentration in the expression system was 22 mmol/L, leading to the maximum protein expression of 1 250 μg/mL. SDS-PAGE revealed the specific band of the purified protein of 47 kDa with a purity of over 90% as expected. The results of direct ELRA showed that when the plates were coated with the receptor at 1:500 dilution, the OD values of the purified receptor binding to three horse radish peroxidase (HRP)-β-agonists decreased in the following order: clenbuterol, salbutamol, and ractopamine, which were 0.976, 0.836 and 0.728, respectively. β2AR was successfully synthesized by using the CFPS system, which will provide a theoretical and practical foundation for the rapid multi-residue determination of β-agonists based on the receptor.

Key words: β2 adrenergic receptor, codon optimization, E. coli-based cell-free protein synthesis system, expression, detection of β-agonists

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