肺癌细胞p53基因第282位密码子点突变后蛋白三级结构改变的预测

Prediction of the possible tertiary structure alterations of p53 protein following point mutation in p53 gene condon 282 in lung cancer cells

利用最新的蛋白质三级结构预测分析平台-Phyre系列软件,运用生物信息学分析软件对p53基因的第282位密码子点突变后的三级结构进行预测。结果表明16HBE肺癌细胞株p53基因第282位密码子出现一个G→T的点突变,其编码氨基酸由精氨酸(CGG)→亮氨酸(CTG)。由于氨基酸的极性改变,可能破坏了p53蛋白与DNA结合面β-发夹结构上的接触,导致p53的H2螺旋与DNA大槽结合的不稳定。

This study was carried out to predict the possible tertiary structure alterations of p53 protein after point mutation of p53 gene condon 282 in lung cancer cells based on the latest 3D structure analysis platform series of Phyre software. It was found that the p53 gene condon 282 mutation （Arg/Leu） may destabilize the H2 helix and DNA binding in the major groove by compromising the contacts of p53 protein with the β-hairpin of DNA binding surface.