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茶叶科学 ›› 2015, Vol. 35 ›› Issue (4): 307-315.doi: 10.13305/j.cnki.jts.2015.04.001

• •    下一篇

茶尺蠖类免疫球蛋白基因EoHML的克隆和表达分析

余玉庚1,2, 袁志军1, 殷坤山1, 付建玉1,2, 肖强*   

  1. 1. 中国农业科学院茶叶研究所,浙江 杭州 310008;
    2. 中国农业科学院研究生院,北京 100081
  • 收稿日期:2014-10-15 修回日期:2015-01-09 出版日期:2015-08-15 发布日期:2019-08-26
  • 通讯作者: *xqtea@mail.tricaas.com
  • 作者简介:余玉庚,男,硕士研究生,主要从事茶园害虫生物防治研究。
  • 基金资助:
    中央级公益性科研院所基本科研业务专项(0032014014)、科技基础性工作专项(2013FY113200)

Molecular Cloning and Expression Analysis of Hemolin Gene in Tea Geometrid (Ectropis obliqua)

YU Yugeng1,2, YUAN Zhijun1, YIN Kunshan1, FU Jianyu1,2, XIAO Qiang1,*   

  1. 1. Tea Research Institute of Chinese Academy of Agricultural Sciences, Hangzhou 310008, China;
    2. Graduate School of Chinese Academy of Agricultural Sciences, Beijing 100081, China
  • Received:2014-10-15 Revised:2015-01-09 Online:2015-08-15 Published:2019-08-26

摘要: 类免疫球蛋白(Hemolin)是一种鳞翅目昆虫特有的免疫相关蛋白,也是唯一的无脊椎动物免疫球蛋白家族成员。本实验应用RACE技术获得了茶尺蠖(Ectropis obliqua Prout)类免疫球蛋白基因的全长cDNA序列,命名为EoHML(GenBank登录号:KM885983),并分析了相关生物信息学特性,检测了病毒感染后基因的表达水平。结果表明,EoHML基因序列全长1β772βbp,包含1β239βbp的开放阅读框,编码412个氨基酸,预测蛋白分子量大小为45.8βkD,等电点(pI)为8.297,属于典型的分泌型蛋白,且具有昆虫Hemolin基因保守的4个Ig功能区和2个N-glycosylation位点。系统进化分析表明,该蛋白与目前已知的类免疫球蛋白氨基酸序列的亲缘关系都较远,与烟草天蛾(Manduca sexta)类免疫球蛋白氨基酸序列相似度最高,为53%。荧光定量检测结果表明,茶尺蠖核型多角体病毒(EoNPV)感染茶尺蠖幼虫后该基因表达量显著升高,最高表达量是正常对照的36.5倍,表明茶尺蠖EoHML基因可能参与了茶尺蠖对EoNPV的免疫代谢反应。

关键词: 茶尺蠖, 类免疫球蛋白, 基因克隆, 表达分析

Abstract: Hemolin, a unique immune protein, belongs to the immunoglobulin superfamily of Lepidoptera insects. A full length cDNA sequence of hemolin gene was cloned by RACE-PCR from tea geometrid (Ectropis obliqua Prout), which was named as EoHML (GenBank Accession No. KM885983). The results of bioinformatics characterization showed that the full length cDNA of EoHML was 1β772βbp, which contained an intact CDS of 1β239βbp and encoded 412 amino acid residues with a putative molecular mass of 45.8βkD and an isoionic point of 8.297. The deduced amino acid sequence demonstrates it belongs to a typical secretory protein that contains 4 Ig functional conservative areas and 2 N-glycosylation sites. Phylogenetic analysis showed that EoHML share the far genetic distance with published hemolin gene and the highest similarity with that of Manduca sexta was only 53%. The results of quantitative real-time PCR analysis further revealed a significant up-regulated expression about 36.5 times in the larvae infected E.obliqua Nucleopolyhedrovirus (EoNPV) than the controls. The study indicated that the EoHML gene may participate in the immune response to EoNPV in tea geometrid.

Key words: tea geometrid (Ectropis obliqua), hemolin, gene cloning, expression analysis

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