›› 2006, Vol. 49 ›› Issue (3): 367-372.

• 研究论文 • 上一篇    下一篇

意大利蜜蜂蜂毒磷脂酶A2基因在杆状病毒-昆虫细胞系统中的表达

沈立荣, 邢丽苹, 张传溪, 程家安   

  1. 浙江大学应用昆虫学研究所
  • 出版日期:2006-07-10 发布日期:2006-06-20

Expression of phospholipase A2 gene from the venom of Apis mellifera in the baculovirus-insect cell system

SHEN Li-Rong, XING Li-Ping, ZHANG Chuan-Xi,CHENG Jia-An   

  1. Institute of Applied Entomology, Zhejiang University
  • Online:2006-07-10 Published:2006-06-20

摘要:

利用Bac to Bac系统将意大利蜜蜂蜂毒磷脂酶A2(AmPLA2)基因cDNA克隆至转移载体pFastBacHTa中,得到pBacHT-AmPLA2,再将其转化入含穿梭载体Bacmid的受体大肠杆菌DH10Bac中,通过转座作用,得到含AmPLA2基因的重组病毒rBacmid-AmPLA2的DNA。提取其基因组DNA,用脂质体介导转染粉纹夜蛾细胞Tn-5B1-4,得到重组病毒rACV-Bac-AmPLA2。用此重组病毒感染Tn-5B1-4细胞, 在细胞中表达AmPLA2。SDS-PAGE电泳结果显示,与6×His Tag融合表达的产物蛋白分子量约为18 kD左右,表达量约占细胞总蛋白的5.35%。Western blot印迹显示,融合表达产物能与意大利蜜蜂蜂毒AmPLA2抗血清发生免疫反应。生物活性测定显示,含表达产物的细胞蛋白粗提物对底物蛋黄的酶活力约为6.13 μmol·min-1·mg-1

关键词: 意大利蜜蜂, 蜂毒, 磷脂酶A基因, 杆状病毒昆虫细胞系统, 表达

Abstract:

The cDNA encoding phospholipase A2 of Apis mellifera (AmPLA2) was cloned into a transfer vector pFastBacHTa to form the recombinant donor plasmid pBacHT-AmPLA2. The recombinant donor plasmid was then transformed into Escherichia coli DH10Bac. By transposition, AmPLA2 gene was integrated into Bacmid, and a recombinant shuttle vector, rBacmid-AmPLA2 was constructed. The cultured Trichoplusia ni Tn-5B1-4 cells, mediated with Lipofectin, were transfected with the rBacmid-AmPLA2 DNA, and then the recombinant baculovirus, rACV-Bac-AmPLA2 was obtained. The recombinant virus was further used to infect the Tn-5B1-4 cells to express the target protein. SDS-PAGE analysis of the infected cellular proteins showed that the size of the expression product of AmPLA2 fused with 6×His tag at its N-terminal was about 18 kD, and the expressed protein accumulated up to about 5.35% of the total cellular proteins. Western blot analysis using anti-AmPLA2 polyclonal serum confirmed the expressed protein was a fusion protein of AmPLA2. The protein extracts of AmPLA2 showed an enzymatic activity of about 6.13 μmol·min-1·mg-1 for hydrolyzing egg yolk substrate.

Key words: Apis mellifera, bee venom, phospholipase A gene, baculovirus-insect cell system, expression