条纹斑竹鲨鱼脂肪酸结合蛋白(FABPs)cDNA的克隆与序列分析

脂肪酸结合蛋白(fatty acid binding protein,FABP)在调节脂肪酸代谢、信号传导以及细胞的增殖与分化过程中起着重要的作用。为揭示FABP在肝脏再生过程中的作用,研究了从前期构建的条纹斑竹鲨鱼肝cDNA文库中克隆到编码FABP的cDNA全序列,并对其表达产物的理化性质、结构和空间分布特点以及在肝脏再生过程中的表达进行了分析,结果表明:条纹斑竹鲨鱼FABP的cDNA全长为1194bp,编码一个由115个氨基酸残基组成的无跨膜区的胞外蛋白,该蛋白的理论Mr为13065.1,理论等电点(pI)为8.81。生物信息学分析结果显示:该蛋白与来自铰口鲨、鸡、短尾负鼠和人的FABP在氨基酸水平上分别具有74%、56%、55%和52%的同源性,其进化地位与同属于海洋软骨鱼类的铰口鲨接近。进一步的分析发现该蛋白和其它物种来源的脂肪酸结合蛋白的结构域相似,它们均含有3个蛋白激酶C(PKC)磷酸化位点、1个N-酰基化位点和2个酪蛋白激酶II磷酸化位点。同源模建分析结果表明该蛋白与人肌肉FABP的A链一样具有一个高度保守的活性区,该活性区由第1～111氨基酸残基组成。本研究进一步考察了FABP编码基因在鲨鱼肝...

Molecular Cloning and Sequence Analysis of the Fatty Acid Binding Protein (FABPs) cDNA from Shark, Chiloscyllium Plagiosum

Fatty acid binding protein (FABP) plays a very improtant role in fatty-acid metabolism, signal transduction, cell proliferation and differentiation. To make better understanding of the molecular mechanisms of liver regeneration, the full-length FABPs cDNA was cloned and sequenced from the shark regenerated hepatic cDNA library. Meanwhile, the physicochemical characteristics, structure and function, and expression profiles of FABPs during liver regeneration were analyzed and predicted by informatics software...