畜牧兽医学报 ›› 2018, Vol. 49 ›› Issue (1): 218-222.doi: 10.11843/j.issn.0366-6964.2018.01.025

• 研究简报 • 上一篇    

旋毛虫plancitoxin-1-like基因的序列分析与编码蛋白结构预测

廖成水1,4, 王晓利2, 田文静1, 杨亚东1, 张梦珂1, 王安琪4, 张春杰1, 刘明远4, Boireau Pascal4,5, 程相朝1,3*   

  1. 1. 河南科技大学, 动物科技学院/洛阳市活载体生物材料与动物疫病防控重点实验室, 洛阳 471023;
    2. 河南科技大学 医学院, 洛阳 471023;
    3. 洛阳职业技术学院, 洛阳 471003;
    4. 吉林大学 人兽共患病研究所/人兽共患病研究教育部重点实验室, 长春 130062;
    5. 法国国家食品、环境及劳动卫生署动物卫生实验室, 迈松阿尔福 94706
  • 收稿日期:2017-06-26 出版日期:2018-01-23 发布日期:2018-01-18
  • 通讯作者: 程相朝,教授,主要从事动物疫病分子与免疫学机制研究,E-mail:chengxch@126.com
  • 作者简介:廖成水(1986-),男,博士,主要从事微生物感染与先天性免疫细胞作用研究,E-mail:liaochengshui33@163.com
  • 基金资助:

    国家自然科学基金(31030064);国家自然科学基金面上项目(31572489);河南科技大学博士启动基金(13480071);河南省高等学校重点科研项目计划(17A230009)

Cloning and Sequence Analysis of Plancitoxin-1-like Gene in Trichinella spiralis

LIAO Cheng-shui1,4, WANG Xiao-li2, TIAN Wen-jing1, YANG Ya-dong1, ZHANG Meng-ke1, WANG An-qi4, ZHANG Chun-jie1, LIU Ming-yuan4, BOIREAU Pascal4,5, CHENG Xiang-chao1,3*   

  1. 1. College of Animal Science and Technology/Luoyang Key Laboratory of Live Carrier Biomaterial and Animal Disease Prevention and Control, Henan University of Science and Technology, Luoyang 471023, China;
    2. Medical College, Henan University of Science and Technology, Luoyang 471023, China;
    3. Luoyang Vocational and Technical College, Luoyang 471003, China;
    4. Key Laboratory of Zoonisis of Ministry of Education, Institute of Zoonosis, Jilin University, Changchun 130062, China;
    5. ANSES's Laboratory for Animal Health, Maisons-Alfort 94706, France
  • Received:2017-06-26 Online:2018-01-23 Published:2018-01-18

摘要:

基因组预测旋毛虫拥有125种庞大的DNase Ⅱ家族蛋白,但只有plancitoxin-1唯一在C端含有一个保守的DNase Ⅱ活性位点(HKD基序)。为研究旋毛虫plancitoxin-1基因的序列结构特征,以旋毛虫总RNA为模板进行RT-PCR,获得plancitoxin-1基因的序列,并利用生物信息学方法进行系统性分析。结果显示,扩增得到的核苷酸序列比GenBank中相关序列短210 bp,编码294个氨基酸,由20种氨基酸组成,重新命名为plancitoxin-1-like,且氨基酸序列中在N端和C端都具有HKD基序。蛋白质理论相对分子质量为33.19 ku,等电点为9.17,是稳定存在的亲水性蛋白。Plancitoxin-1-like的氨基酸序列与其他物种DNase Ⅱ的相似性为35%左右。Plancitoxin-1-like含有4个N-糖基化位点、3个O-糖基化位点、31个磷酸化位点、17个B细胞线性结合位点和9个T细胞结合位点以及3个二硫键。二级结构中,α-螺旋占14.29%(42个),延伸链占28.23%(83个),无规卷曲占55.10%(162个)。本研究成功克隆旋毛虫plancitoxin-1-like基因,对其序列结构进行分析,为进一步研究庞大的DNase Ⅱ家族蛋白在旋毛虫发育和感染中的作用奠定基础。

关键词: 旋毛虫, DNase II, 克隆, 生物信息学

Abstract:

It is noteworthy that more extensive expansion of the DNase Ⅱ-like protein family (estimated 125 genes) in the genome of the parasitic nematode Trichinella spiralis (T. spiralis). However, only plancitoxin-1 possesses one predicted active site of DNase Ⅱ (HKD motif) in its C-terminus domain in 125 DNase Ⅱ-like protein family. To explore the molecular characteristics of plancitoxin-1 gene in T. spiralis, plancitoxin-1 gene was cloned by RT-PCR from total RNA of T. spiralis larvae, and analyzed with bioinformatics software. The results showed that the sequences of plancitoxin-1 cloned from T. spiralis were shorter (210 bp less) than the XM_003370715.1 sequence in GenBank, and named after plancitoxin-1-like. The gene encoded a protein of 294 amino acids. Intriguingly, there were two HKD motifs in the N-and C-termini in the cloned sequences. plancitoxin-1-like is a stable protein with a predicted molecular mass (Mr) of 33.19 kDa and theoretical pI of 9.17. By sequence alignment, plancitoxin-1-like protein revealed 35% sequence identity to previously reported DNase Ⅱ family members from other species. A total of 4 N-linked glycosylation sites, 3 O-linked glycosylation sites, 31 phosphorylation site 17 linear B cell piptope, 9 T cell binding sites, and 3 disulfide bond were predicted in plancitoxin-1-like. Analysis of secondary structure revealed that α-helix, extended strand, and random coil were 14.29% (42), 28.23% (83), and 55.10% (162), respectively. In this study, the plancitoxin-1-like gene was cloned and analyzed. The results laid the foundation for the further study on the role of development infection in T. spiralis.

Key words: Trichinella spiralis, DNase Ⅱ, clone, bioinformatics

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