连接蛋白26与神经内分泌特异蛋白的羧基端相互作用

Interaction of connexin 26 with the C-terminal ofneuroendocrine specific protein

目的 :应用酵母双杂交技术筛选和鉴定连接蛋白 2 6 (connexin 2 6 ,Cx2 6 )的相互作用蛋白质。方法 :以正常人DNA为模板 ,PCR扩增Cx2 6 (GJB2 )全长编码区作为诱饵 ,基因重组法定向克隆到第 3代MatchMakerGal4双杂交系统的 pGBKT7质粒 ,用构建的pGBKT7 Cx2 6质粒筛选人胎脑cDNA文库 ,获得的阳性克隆的插入子为Cx2 6的相互作用蛋白质 (猎物 ) ,将Cx2 6和筛选到的相互作用蛋白再一对一回复进行酵母双杂交实验 ,去除假阳性。对阳性克隆插入子的DNA序列进行测序 ,在GenBank中作匹配及生物信息学分析。结果 :1个阳性克隆的插入子与神经内分泌特异蛋白 (neuroendocrinespecificprotein ,NSP)羧基端的 1 4 5个氨基酸残基序列一致 ,阅读框无移位。结论 :Cx2 6与NSP的羧基端具有相互作用 ,NSP可能在Cx2 6蛋白的转运。

Objective To screen and identify the interactive proteins with connexin 26 (Cx26) by the yeast two hybrid technique. Methods The whole coding region of Cx26 (GJB2) gene was amplified from normal human genomic DNA by polymerase chain reaction (PCR). The “bait” Cx26 was then subcloned into the vector pGBKT7 plasmid of the MatchMaker Gal4 Two Hybrid System 3 as a target to screen its interactive proteins (“prey”) from the human fetal brain cDNA library by the yeast two hybrid technique. The false positive clones were discarded from the preys by one to one yeast two hybrid method between Cx26 and the preys. The DNAs of the preys were sequenced and BLAST analyzed against the GenBank,and also underwent other bioinformatics analysis. Results The insert of one positive clone contained 145 amino acids residues that was identical to the C terminal of the neuroendocrine specific protein (NSP) and the open reading frame of the insert was correct. Conclusion Cx26 is interacted with the C terminal of NSP. NSP may participate in the process of Cx26 transportation, assembling the connexon, or influencing the functions of its connexons.