›› 2008, Vol. 51 ›› Issue (9): 979-985.

• 研究论文 • 上一篇    下一篇

棉铃虫羧酸酯酶基因的克隆、序列分析及组织表达

王东,李兵,管京敏,赵华强,陈玉华,沈卫德   

  • 出版日期:2008-09-20 发布日期:2008-09-20
  • 通讯作者: 沈卫德

Cloning, sequence analysis and tissue expression of a carboxylesterase gene from Helicoverpa armigera (Hübner) (Lepidoptera: Noctuidae)

WANG Dong   

  • Online:2008-09-20 Published:2008-09-20

摘要: 为了从分子水平上研究棉铃虫Helicoverpa armigera (Hübner) 对杀虫剂抗性的产生机理,本文通过RTPCR和RACE方法首次从棉铃虫中肠中克隆了一个羧酸酯酶全长cDNA序列。序列分析表明,该基因包含一个1 794 bp的开放读码框,129 bp的5′UTR和139 bp的3′UTR区域。该基因编码597个氨基酸, 推测编码蛋白质的等电点pI为4.92,分子量为67.1 kD,GenBank登录号为EF547544。通过对氨基酸的同源性分析表明,该羧酸酯酶与斜纹夜蛾Spodoptera litura羧酸酯酶的同源性最高,达60%。半定量RT-PCR分析表明,该基因在中肠组织中表达量最高,在脂肪体和生殖腺中表达量较低,在头部则不表达。推测该羧酸酯酶基因可能主要参与棉铃虫对外源物质的解毒代谢。

关键词: 棉铃虫, 羧酸酯酶, RACE, 序列分析, 组织表达

Abstract: In order to study the molecular mechanisms of insecticide resistance in Helicoverpa armigera (Hübner), a fulllength carboxylesterase cDNA was firstly cloned from H. armigera using RT-PCR and rapid amplification of cDNA ends (RACE) strategies. Sequence analysis revealed that this gene contains a 1 794 bp ORF, a 129 bp 5 UTR and 139 bp 3UTR, encoding a 597-amino-acid protein. The predicted molecular weight and isoelectric point of this carboxylesterase were 67.1 kD and 4.92, respectively. This gene was deposited in GenBank under the accession no. EF547544. Homology analysis showed that this carboxylesterase is most similar to that from Spodoptera litura with 60% amino acid identity. The results of semi-quantitative RT-PCR showed that this gene was highly expressed in the midgut, low expressed in fat body and gonad and not expressed in head. It is inferred that this carboxylesterase gene may be involved in detoxification of xenobiotics.

Key words: Helicoverpa armigera, carboxylesterase, RACE, sequence analysis, tissue expression