cDNA文库噬菌体展示法的建立及乙型肝炎病毒前S1蛋白结合蛋白筛检

CLONING AND ANALYSIS OF THE CODING SEQUENCE FOR HEPATITIS B VIRUS PRES1 BINDING PROTEIN BY T7 cDNA PHAGE DISPLAY SYSTEM

为寻找乙型肝炎病毒 (HBV)前S1蛋白的结合蛋白 ,将前S1蛋白包被于聚苯乙烯平板 ,经过“包被 吸附 洗脱”筛检过程 ,获得前S1蛋白结合蛋白的cDNA序列 ,并将推断的氨基酸序列进行相互比较 ,经生物信息学方法获得结合蛋白的全长序列。共经过 4轮生物淘洗过程。结果提示 ,神经胶质瘤抑制子候选基因区基因 (GLTSCR) 2上游部分序列存在于与HBV前S1结合的重组T7噬菌体中 ,多个克隆的测序结果发现前S1蛋白结合蛋白具有KxPxKSGxxxL结构域。HBV前S1蛋白的结合蛋白可能是GLTSCR 2的编码产物。

T7 cDNA phage display method was employed to find the binding protein of PreSl protein. PreSl protein was coated in a 96-well ELISA plate, and then T7 cDNA library phages were bound to the target protein. Phages which did not bind to garget protein were washed away and the binding phages were eluted. Insertions from different clones were sequenced, and the deduced amino acid sequences were analyzed by Vector 6.0 software. Using BLAST software in GenBank, whole length of amino acid sequence of binding protein was obtained. After 4 rounds of biopanning, recombinant T7 phages with binding ablity were amplifed by infection to E. coli. One piece of amino acid sequence was found to be amino terminal of product of glioma tumor suppressor candidate region gene 2 (GLTSCR2). There was a binding domain KxPxKSGxxxL in these clones. T7 cDNA phage display technique can be used bo find the ligand. GLTSCR2 coding protein may be the binding protein to preSl protein of HBV.\;