中国寄生虫学与寄生虫病杂志

• 研究简报 • 上一篇    下一篇

粉尘螨过敏原β-己糖胺酶的表达、纯化和生物信息学分析

莫丽华1,刘玉琳2,杨利桃3,范小琴3,刘志刚1,杨平常1 *   

  1. 1 深圳大学过敏反应与免疫学研究所,深圳 518060;
    2 南昌大学医学院免疫学教研室,南昌 330006;
    3 深圳大学耳鼻咽喉科研究所,深圳 518020
  • 出版日期:2015-04-30 发布日期:2015-05-04

Expression,Purification and Bioinformatics Analysis of β-hexosaminidase of Dermatophagoides farinae

MO Li-hua1,LIU Yu-lin2,YANG Li-tao3,FAN Xiao-qin3,LIU Zhi-gang1,YANG Ping-chang 1 *   

  1. 1 Institute of Allergy and Immunology,Shenzhen University,Shenzhen 518060,China;2 Department of Immunology,Medical College of Nanchang University,Nanchang 330006,China;3 Institute of Otolaryngology,Shenzhen University,Shenzhen 518020,China
  • Online:2015-04-30 Published:2015-05-04

摘要:

合成粉尘螨β-己糖胺酶基因并连接至pET-28a载体,用异丙基-β-D-硫代半乳糖苷(IPTG)诱导表达重组β-己糖胺酶蛋白。通过生物信息学软件分析粉尘螨β-己糖胺酶蛋白基本特性。表达菌经诱导后,高效表达出β-己糖胺酶蛋白,SDS-PAGE结果显示表达产物相对分子质量(Mr)约为55 000。粉尘螨β-己糖胺酶基因序列全长1 410 bp,编码469个氨基酸,位于胞外,无信号肽,属亲水性蛋白,其二级结构由14.71%的片层,30.70%的螺旋和54.58%的环组成。

关键词: 粉尘螨, &beta, -己糖胺酶, 原核表达

Abstract:

The DNA fragment encoding β-hexosaminidase was synthesized, and cloned into pET-28a vector. The constructed plasmid pMD18-T-β-hexosaminidase was transformed into E. coli Top10 and followed by expression of the protein induced by IPTG. SDS-PAGE result showed that the relative molecular mass of the recombinant protein was about Mr 55 000. The full length of β-hexosaminidase gene was 1 410 bp. Bioinformatics analysis revealed that β-hexosaminidase was composed with 469 amino acid residues with a calculated molecular weight of Mr 55 000, and its secondary structure was composed of strand(14.71%), helix(30.70%), and loop(54.58%). β-hexosaminidase was a hydrophilic protein without signal peptide, and located in the extracellular space.

Key words: Dermatophagoides farinae;&beta, -hexosaminidase;Prokaryotic expression