畜牧兽医学报 ›› 2017, Vol. 48 ›› Issue (12): 2374-2382.doi: 10.11843/j.issn.0366-6964.2017.12.017

• 预防兽医 • 上一篇    下一篇

多头带绦虫dUTPase基因的原核表达、组织定位及酶学活性分析

黄兴1,2, 徐璟1, 王宇1, 杨应东3, 万洁3, 郭承1, 古小彬1, 谢跃1, 杨光友1*   

  1. 1. 四川农业大学动物医学院, 成都 611130;
    2. 成都农业科技职业学院, 成都 611130;
    3. 攀枝花农林科学研究院, 攀枝花 617061
  • 收稿日期:2017-06-08 出版日期:2017-12-23 发布日期:2017-12-23
  • 通讯作者: 杨光友,教授,博士,博导,主要从事动物寄生虫病学研究,E-mail:guangyou1963@aliyun.com
  • 作者简介:黄兴(1983-),男,土家族,重庆人,副教授,博士,主要从事动物寄生虫病学研究,E-mail:huangxing198308@163.com
  • 基金资助:

    四川省科技支撑计划项目(2015NZ1504)

Prokaryotic Expression, Tissue Localization and Enzymatic Activity Analysis of Taenia multiceps dUTPase Gene

HUANG Xing1,2, XU Jing1, WANG Yu1, YANG Ying-dong3, WAN Jie3, GUO Cheng1, GU Xiao-bin1, XIE Yue1, YANG Guang-you1*   

  1. 1. College of Veterinary Medicine, Sichuan Agricultural University, Chengdu 611130, China;
    2. Chengdu Agricultural College, Chengdu 611130, China;
    3. Panzhihua Academy of Agricultural and Forestry Sciences, Panzhihua 617061, China
  • Received:2017-06-08 Online:2017-12-23 Published:2017-12-23

摘要:

探讨多头带绦虫脱氧尿苷三磷酸酶(Tm-dUTPase)的基因特征,并初步分析Tm-dUTPase的酶学活性。通过原核表达,得到重组Tm-dUTPase蛋白,并对其进行Western blot分析、免疫荧光定位及酶学活性分析。序列分析结果显示,Tm-dUTPase基因ORF框为447 bp,编码148个氨基酸,预测的蛋白质分子大小为16.39 ku,等电点为6.263;与猪囊尾蚴和豆状囊尾蚴dUTPase基因的氨基酸序列相似性分别为97%和91%。原核表达的Tm-dUTPase为可溶性蛋白,纯化后的蛋白质质量浓度为0.907 mg·mL-1,Western blot分析显示,该蛋白质能够被山羊脑多头蚴阳性血清所识别,具有较强的反应原性。免疫荧光定位显示Tm-dUTPase主要分布于多头带绦虫成虫的体内实质区,同时广泛分布于多头带绦虫幼虫(脑多头蚴)的头节和包囊囊壁外层。酶学活性试验测得重组Tm-dUTPase的比活力为986.29 U·mg-1,EDTA能够抑制Tm-dUTPase活性,而金属离子Mg2+、Zn2+、Cu2+能够增强Tm-dUTPase活性。上述结果为进一步研究Tm-dUTPase基因的生物学功能奠定了基础。

Abstract:

The aim of this study was to characterize the dUTPase gene of Taenia multiceps and analyze its enzymatic activity. The recombinant Tm-dUTPase was expressed in prokaryotic system and the enzymatic activity was measured; Western blotting analysis and immunofluorescence localization were also performed. Sequence analysis showed that the Tm-dUTPase gene contains a 447 bp open reading frame and the mature polypeptide consists of 148 amino acid residues, with a predicted molecular weight of 16.39 kDa and PI of 6.263; the deduced amino acid of Tm-dUTPase shares 97% and 91% similarity with dUTPase from Cysticercus cellulosae and Taenia pisiformis respectively. The recombinant Tm-dUTPase was expressed as a soluble protein, and the purified protein has a concentration of 0.907 mg·mL-1. The Western blotting showed that the recombinant Tm-dUTPase could be recognized by the serum of goat naturally infected with Coenurus cerebralis, indicating a relatively high immunoreactivity. The immunolocalization showed that the native Tm-dUTPase mainly distributed to the parenchymatous zone of the adult parasite, and widely distributed to the protoscolexes and out layer of the cystic wall of Coenurus cerebralis. The enzyme activity of Tm-dUTPase was 986.29 U·mg-1, and the activity could be inhibited by EDTA and enhanced by Mg2+, Zn2+ and Cu2+. These results would greatly benefit the further study of the biological function of Tm-dUTPase.

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