云南切梢小蠹热激蛋白40基因的克隆与序列分析
2017-05-30樊晓红
摘要[目的]克隆云南切梢小蠹(Tomicus yunnanensis)热激蛋白40基因,并进行序列分析,得到该基因的特征。[方法]采用RACE克隆技术,获得云南切梢小蠹热激蛋白40基因,并对该基因进行分析。[结果]试验获得的基因序列长为1 205 bp,开放阅读框1173 bp,编码氨基酸序列390个,编码蛋白质的预测分子量为43.56 ku,等电点为7.35。该基因蛋白序列具有1个Amidation位点,2个天冬酰胺N末端糖基化位点,2个CAMP和CGMP依赖性蛋白激酶磷酸化位点,3个酪蛋白激酶 Ⅱ 磷酸化位点,7个N末端十四烷基化位点,4个蛋白激酶C磷酸化位点,1个RGD细胞附着序列,1个DNAJ-1 结构域等热激蛋白40所具有的典型特征。[结论]通过同源性比对分析发现,云南切梢小蠹热激蛋白40基因与家蚕(Bombyx mori)、赤拟谷盗(Tribolium castaneum)、美洲斑潜蝇(Liriomyza sativae)和东亚飞蝗(Locusta migratoria)的热激蛋白40基因在氨基酸水平上一致性为20%~30%,它们的相似性均不高。虽然不同昆虫Hsp40在进化过程中具有高度的保守性,编码序列变异比较低,但是结构域差异与生物体适应外界环境有一定的关系。
关键词云南切梢小蠹;热激蛋白40;序列分析
中图分类号S763.38文献标识码A文章编号0517-6611(2017)05-0147-04
Abstract[Objective]To clone the gene of heat shock protein 40 in Tomicus yunnanensis and get the gene characteristics by sequence analysis.[Method]The gene of heat shock protein 40 in T.yunnanensis was obtained and analyzed by using rapid amplification of cDNA ends (RACE) method. [Result]This gene was 1 205 bp in length with opening reading frame (ORF) of 1 173 bp. The deduced amino acid sequence of T.yunnanensis Hsp40 revealed a protein of 390 amino acids.Its predicted molecular weight and isoelectric point were 43.56 ku and 7.35. It has several conservation amino acid sites including one Amidation site, two Nglycosylation sites, two CAMP and CGMP dependent protein kinase phosphorylation sites, three Casein kinase II phosphorylation sites, seven Nmyristoylation sites, four Protein kinase C phosphorylation sites, one RGD Cell attachment sequence, and one DNAJ1 Cell attachment sequence.[Conclusion]It shared 20%-30% amino acid identity with the Hsp40 of Bombyx mori,Tribolium castaneum,Liriomyza sativae and Locusta migratoria.Their similarity is not high. Although the Hsp40 of different insects is highly conserved in the evolution process, the variation of the coding sequence is relatively low, but there has a certain relationship between the structural domain differences and the organism that adapting to the external environment.
Key wordsTomicus yunnanensis;Heat shock protein 40;Sequence analysis
基金項目云南省林学一级学科博士点建设项目。
作者简介樊晓红(1989—),女,云南楚雄人,硕士研究生,研究方向:森林昆虫学。
收稿日期2016-12-31
热激蛋白(Heat shock proteins,Hsp)又称热休克蛋白或应激蛋白,是细胞或生物体受到胁迫后合成的一类高度保守的蛋白质。热激蛋白作为细胞的重要组成成分,几乎在所有的生物体都有存在。昆虫体内的Hsps在受到各种因素(如高温、低温、干燥、缺氧、杀虫剂、重金属、饥饿等)的刺激下,均可通过自身基因表达的改变,使机体热激蛋白物质合成增多。……
