刘建兵;李文龙;蔡芳芳;崔小华;郝建卿;师如意;林晓雨;李莉;

• 1:山西医科大学基础医学院医学细胞生物与遗传学教研室
• 2:山西医科大学细胞生理学教育部重点实验室
• 3:山西医科大学基础医学院

摘要(Abstract)：

目的对胎盘特异蛋白8(placenta-specific protein 8,PLAC8)的理化性质及其分子结构进行分析,为进一步研究PLAC8的功能及其作用机制提供新的思路和方向。方法应用ProtParam和Protscale,SignalP,TMHMM,PSORTⅡ,OPMA和Conserved Domain,NetNGlyc、YinOYang和Netphos,STRING等软件,分析PLAC8的理化性质、信号肽结构、跨膜结构、亚细胞定位、二级结构和结构域、蛋白翻译后位点修饰以及预测相互作用蛋白,并构建系统进化树。结果PLAC8的相对分子质量为12 440.52,分子式为C_(524)H_(832)N_(154)O_(157)S_(22),理论等电点(PI)=7.34,不稳定指数为38.99,亲水性平均总值为0.125,脂肪指数为57.65,整体亲水区大于疏水区。PLAC8不具有信号肽和跨膜结构域;定位于细胞外基质(44.4%)、细胞质(33.3%)、液泡(11.1%)和细胞核(11.1%);二级结构主要由α-螺旋(47%)组成;保守结构域由77个氨基酸残基构成;有5个O-糖基化位点和4个磷酸化位点;互作蛋白主要包括中性粒细胞弹性蛋白酶(elastase,neutrophil expressed,ELANE;score:0.913)、组蛋白酶G(cathepsin G,CTSG;score:0.913)、组蛋白酶(cathepsin G,CTSC;score:0.910)等10个蛋白。人PLAC8的蛋白序列与黑猩猩相似度最高,与家兔相似度最低。结论 PLAC8是一种碱性蛋白,主要定位于细胞外基质,且具有多个糖基化和磷酸化修饰位点,能够与多个蛋白形成互作网络;人PLAC8的蛋白序列与黑猩猩相似度最高。本研究将为进一步探讨PLAC8在生命活动中的功能及其作用机制提供了新的思路。

关键词(KeyWords)： 胎盘特异蛋白8;理化性质;分子结构;生物信息学

Abstract:

Keywords:

基金项目(Foundation): 山西医科大学博士启动金项目（03201502）;; 山西省教育厅高校科技创新计划（2020L0189）

作者(Authors): 刘建兵;李文龙;蔡芳芳;崔小华;郝建卿;师如意;林晓雨;李莉;

DOI: 10.13200/j.cnki.cjb.003442

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