›› 2010, Vol. 53 ›› Issue (7): 727-733.doi:

• 研究论文 • 上一篇    下一篇

甜菜夜蛾围食膜肠粘蛋白基因SeM-8的克隆、序列分析及在不同组织中的表达检测

李雯,郭巍,张霞,李杰,孙伟明   

  • 出版日期:2011-01-28 发布日期:2010-07-20
  • 通讯作者: 郭巍

Cloning, sequence analysis and detection of tissue-specific expression of the intestinal protein gene SeM-8 from Spodoptera exigua (Lepidoptera: Noctuidae) peritrophic membrane

LI Wen, GUO Wei, ZHANG Xia, LI Jie, SUN Wei-Ming   

  • Online:2011-01-28 Published:2010-07-20

摘要: 昆虫肠粘蛋白(invertebrate intestinal mucin, IIM)是围食膜(peritrophic membrane, PM)的重要蛋白组分之一,在保护昆虫免受微生物侵染方面起着非常重要的作用。本研究以甜菜夜蛾Spodoptera exigua 5龄幼虫中肠总RNA为模板,根据已知的甜菜夜蛾肠粘蛋白SeIIM-8基因的cDNA序列(GenBank登录号:ABW06596)设计引物,利用RT-PCR技术扩增得到甜菜夜蛾肠粘蛋白基因SeM-8,序列分析发现其开放阅读框(open reading frame, ORF)长2 703 bp,编码900个氨基酸残基,预测分子量为95.7 kDa。序列分析表明,其氨基酸序列(GenBank登录号:GU255994)与棉铃虫Helicoverpa armigera(Hübner),粘虫Mamestra configurata和小菜蛾Plutella xylostella肠粘蛋白的一致性分别为48%,49% 和45%。Western blot分析结果表明,SeM-8粘蛋白在甜菜夜蛾即将孵化的卵和5龄幼虫的围食膜、中肠和粪便中都有存在,在5龄幼虫马氏管、脂肪体、唾腺、血淋巴等组织部位没有发现。本研究为进一步研究IIM结构和功能,寻找生物防治新靶标奠定了理论基础。

关键词: 甜菜夜蛾, 围食膜, 昆虫肠粘蛋白, RACE, 克隆, 表达, 定位

Abstract: Invertebrate intestinal mucin (IIM) is one of the important components of proteins on peritrophic membrane and plays a very important role in the protection against microbial infection of insects. The instestinal protein gene SeM-8 was amplified from 5th instar larvae of Spodoptera exigua by using RT-PCR technique. Sequence analysis showed that its open reading frame (ORF) is 2 703 bp in length, encoding a polypeptide of 900 amino acid residues with the predicted molecular mass of 95.7 kDa. SeM-8 protein shares 48%, 49% and 45% identities in amino acid with homologues from Helicoverpa armigera, Mamestra configurata and Plutella xylostella, respectively. Immuno-localization analysis showed that SeM-8 could be detected in egg, peritrophic membrane, midgut tissue and fecal pellets, but not detected in Malpighian tubules, fat body, salivary glands and haemolymph of 5th instar larvae. The results provided a foundation for pest management by using midgut as target.  

Key words: Spodoptera exigua, peritrophic membrane, invertebrate intestinal mucin, RCAE, cloning, expression, localization