›› 2007, Vol. 50 ›› Issue (7): 745-749.

• 研究论文 • 上一篇    下一篇

斜纹夜蛾两个天蚕素D基因的克隆及序列分析

陈维春,宋杰,庞义*   

  1. (中山大学有害生物控制与资源利用国家重点实验室,昆虫学研究所,广州 510275)
  • 出版日期:2007-08-21 发布日期:2007-08-21
  • 通讯作者: 庞义

Cloning and sequence analysis of two cecropin D genes from the common cutworm, Spodoptera litura (Lepidoptera:Noctuidae)

CHEN Wei-Chun, SONG Jie, PANG Yi   

  1. (State Key Laboratory for Biocontrol, Institute of Entomology, Sun Yat-Sen University, Guangzhou 510275, China)
  • Online:2007-08-21 Published:2007-08-21
  • Contact: PANG Yi

摘要: 天蚕素是昆虫抵御病菌入侵的一类抗菌肽家族。根据斜纹夜蛾Spodoptera litura天蚕B基因设计特异引物,通过PCR扩增得到2个新的天蚕素基因部分序列,分别命名为cecD1cecD2GenBank登录号分别为EF555567EF555568)。2个基因编码同一个天蚕素D蛋白,该蛋白的成熟肽与天蚕素B存在2个氨基酸残基差异。序列分析发现cecD1cecD2中分别包含568 bp377 bp的内含子序列,它们有相同的5′和3′拼接位点,A+T含量分别为59.7%69.8%,符合大多数真核生物内含子高A+T含量的特征。

关键词: 斜纹夜蛾, 抗菌肽, 天蚕素, 内含子, 基因结构

Abstract:

Cecropins are a family of antibacterial peptides synthesized in insects as a response to a bacterial infection. Two primers were designed according to cecropin B gene from Spodoptera litura and were used to PCR. As the result, two new cecropin genes, named cecD1 and cecD, were obtained, which encoded identical preprocecropin D. There was 2 amino acid residues difference between the mature peptide of preprocecropin D and that of cecropin B from S. litura. Two introns, 568 bp and 377 bp long, were found in cecD1 and cecD2, respectively, both having the same 5′and 3′splicing sites. The A+T content was 59.7% in cecD1 intron and 69.8% in cecD2 intron, conforming to the high A+T content characteristics of most eukaryotic introns.

Key words: Spodoptera litura, antibacterial peptide, cecropin, intron, gene structure