›› 2012, Vol. 39 ›› Issue (11): 7-12.

• 生物技术 • 上一篇    下一篇

Ⅰa型牛源无乳链球菌M7菌株Sip基因的分子特征分析

王旭荣, 张世栋, 杨峰, 杨志强, 李宏胜, 李建喜   

  1. 中国农业科学院兰州畜牧与兽药研究所,甘肃省中兽药工程技术研究中心, 农业部兽用药物创制重点实验室,中国农业科学院临床兽医学研究中心,甘肃兰州 730050
  • 收稿日期:2012-04-18 出版日期:2012-11-20 发布日期:2012-11-22
  • 通讯作者: 李宏胜(1964-),男,研究员,博士,主要从事奶牛乳房炎免疫及预防研究。E-mail:lihsheng@sina.com李建喜(1971-),男,副研究员,博士,主要从事中药现代化和奶牛疾病研究。 E-mail:lihsheng@sina.com李建喜(1971-),男,副研究员,博士,主要从事中药现代化和奶牛疾病研究。
  • 作者简介:王旭荣(1980-),女,山西人,助理研究员,博士,主要从事分子病毒学和分子细菌学研究。
  • 基金资助:
    国家奶牛产业技术体系科学家岗位项目(CARS37);国家科技支撑项目"奶牛健康养殖重要疾病防控关键技术研究"(2012BAD12B03)。

Characterization of the Sip Gene in the Isolate M7 of Ⅰa Serotype of Streptococcus agalactiae from Bovine

WANG Xu-rong, ZHANG Shi-dong, YANG Feng, YANG Zhi-qiang, LI Hong-sheng, LI Jian-xi   

  1. Research Center of Clinical Veterinary Medicine, China Academy of Agricultral Sciences,Key Laboratory of Veterinary Pharmaceutics Discovery, Ministry of Agriculture,Engineering and Technology Research Center of Traditional Chinese Veterinary Medicine of Gansu Province,Lanzhou Institute of Husbandry and Pharmaceutical Science of China Academy of Agricultral Sciences,Lanzhou 730050, China
  • Received:2012-04-18 Online:2012-11-20 Published:2012-11-22

摘要: 通过PCR方法扩增Ⅰa型牛源无乳链球菌地方菌株M7的Sip基因,将目的片段克隆入pGEM-T Easy载体并进行测序,采用多种生物软件对Sip基因及其表达的蛋白质进行分子特征分析。试验结果表明,M7菌株的Sip基因为1305 bp,未出现基因缺失;与GenBank中发表的不同血清型的无乳链球菌菌株的相应核苷酸序列同源性为98.0%~100.0%,推导的氨基酸同源性为97.2%~99.8%。M7的Sip基因与中国菌株Ly2(FJ808732)和美国菌株GB00549(FJ752159)的相应基因的核苷酸同源性和氨基酸同源性最高,核苷酸同源性均为100.0%,氨基酸同源性均为99.8%。该Sip基因表达的蛋白质是一种稳定的分泌性外膜蛋白,疏水性强;其N-末端的第52-95位氨基酸残基之间含有1个LysM超家族的保守结构域;存在1-25位氨基酸的信号肽,剪切位点在第25-26位氨基酸之间;存在多个B细胞和T细胞表位。说明M7菌株的Sip基因是未缺失LysM超家族结构域的比较保守的免疫蛋白。

关键词: 牛; 无乳链球菌; Sip基因; Ⅰa型

Abstract: The Sip gene of the isolate M7 of Ⅰa serotype Streptococcus agalactiae from bovine was amplified using the PCR method,cloned into pGEM-T Easy vector and then sequenced. The molecular characteristics of Sip gene and its expression protein were analyzed using a variety of biological software. The results showed that Sip gene of M7 was 1305 bp and did not appear the gene deletion, the Sip gene of nucleotide sequence derived from M7 had a 98.0% to 100.0% of homology and a 97.2% to 99.8% amino acid homology among the corresponding sequences published in GenBank.Furthermore, the Sip gene of M7 shared of 100.0% nucleotide homology and 99.8% of amino acid identity with that of Ly2(FJ808732)strains in China and GB00549(FJ752159)in USA, respectively. The expression protein of Sip gene was a stable outer membrane protein,which was secretion protein and hydrophobic highly. The polypeptide contained a LysM functional domain which was related to immunoregulation between the N-terminal 52nd to 95th amino acid residues and a signal peptide consisting of 25 amino acids, which of cleavage site between 25th and 26th amino acids. Moreover there were a number of B cell and T cell epitopes on the protein. The results illustrated the Sip protein of M7 strain was conservative immune proteins without missing LysM superfamily domain.

Key words: bovine; Streptococcus agalactiae; surface immunogenic protein(Sip) gene; Ⅰa serotype

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