生物技术通报 ›› 2014, Vol. 0 ›› Issue (1): 191-195.

• 研究报告 • 上一篇    下一篇

烟台黑猪SLA-I 重链基因末端生物素修饰及表达

刘筏,杨金刚,翟晓鑫,董宋鹏,高凤山   

  1. 大连大学生命科学与技术学院,大连 116622
  • 收稿日期:2013-09-11 出版日期:2014-01-23 发布日期:2014-01-23
  • 作者简介:刘筏,女,研究方向: 动物分子免疫学;E-mail: 729652171@qq.com
  • 基金资助:
    国家自然科学基金项目(31172304),辽宁省大学生创新项目(201311258009),大连大学本科生创新项目(2012029)

Biotinylated the Carboxyl Terminal of Heavy Chain of SLA-I from Yantai Black Pig and Its Expression

Liu Fa, Yang Jingang, Zhai Xiaoxin, Dong Songpeng, Gao Fengshan   

  1. College of Life Science and Technology,Dalian University,Dalian 116622
  • Received:2013-09-11 Published:2014-01-23 Online:2014-01-23

摘要: 为构建烟台黑猪SLA-2 重链基因偶合生物素化酶BirA 底物肽(BirA substrate peptide,BSP)并研究其在pET-28a#br#(+)中的表达,设计烟台黑猪SLA-2-BSP 复合基因引物,PCR 扩增烟台黑猪SLA-2-YTH-BSP 复合基因,并克隆至pMD 19-T Simple#br#Vectorp,经酶切鉴定后将SLA-2-YTH-BSP 复合基因与表达系统pET-28a(+)链接,并转化到BL21(Rosseta)菌进行诱导表达,#br#SDS-PAGE 检测目的蛋白。表达蛋白经过Ni-NTA 亲和纯化,并经SDS-PAGE 检测蛋白纯化效果。PCR 结果显示SLA-2-BSP 大小为#br#900 bp,并成功克隆到pMD 19-T Simple Vector,酶切鉴定大小为876 bp,该基因链接到 pET-28a(+)并转化到BL21(Rosseta)菌,#br#经诱导表达和SDS-PAGE 检测目的蛋白的大小为32.4 kD。目的蛋白以包涵体形式存在,纯化后蛋白纯度达到90% 以上。成功构建#br#烟台黑猪SLA-I 重链偶合生物素化酶BirA 底物肽(BSP)的pET-28a(+)的重组表达系,为下一步的SLA-I 类分子四聚体研究鉴#br#定基础。

关键词: 烟台黑猪 SLA-2, 重链基因, 生物素化酶BirA, 底物肽, 纯化

Abstract: To construct the heavy chain of SLA-2 conjugated with the BirA substrate peptide(BSP)and express the recombinant genes in pET-28a(+)for Yantai Black Pig(YTH), a pair of primers to express the recombinant SLA-2-YTH-BSP was designed and the recombinant SLA-2-YTH-BSP was amplified by PCR followed by sub-cloning the gene into pMD19-T Simple Vector. After identification by cleavage with Nde I and Xho I, the SLA-2-YTH-BSP was ligated to pET-28a(+)and the recombinant plasmids was transformed into BL21 (Rosseta)to be induced to express followed by analysis of the expressing products by SDS-PAGE. The expressed interest of protein was purified by Ni-NTA column and detected by SDS-PAGE. The PCR results showed that the length of nucleotides of SLA-2-YTH-BSP was about 900 bp which was consistent with the calculated value. Then, the SLA-2-YTH-BSP with 876 bp was successfully inserted into the pMD-19-T Simple Vector identified by cleavage with Nde I and Xho I, and then the genes were inserted into pET-28a(+)and transformed into Escherichia coli BL21(Rosseta). After induction, SLA-2-YTH-BSP was successfully expressed with the interest of protein about 32.4 kD. After purification,the purity of the interest of the inclusion protein reached to 90%. It was concluded that the recombinant expressing system containing SLA-2 conjugated with BSP in pET-28a(+)was successfully constructed and the research would pave the base to construct tetramer in SLA class I.

Key words: Yantai black pig SLA-2, Heavy chain gene, BirA substrate peptide, Purification