Cloning of human choline ethanolaminephospho transferases synthesis of phosphatidyl choline phosphatidyle thanolamine and platelet activating factor
    3.
    发明授权
    Cloning of human choline ethanolaminephospho transferases synthesis of phosphatidyl choline phosphatidyle thanolamine and platelet activating factor 失效
    人胆碱乙醇胺磷酸转移酶的克隆磷脂酰胆碱磷脂酰多酚胺和血小板活化因子的合成

    公开(公告)号:US06451568B1

    公开(公告)日:2002-09-17

    申请号:US09719083

    申请日:2000-12-08

    IPC分类号: C12P764

    摘要: We report the first cloning and expression, from a mammalian source, of proteins capable of catalyzing choline- and ethanolaminephosphotransferase reactions (hCEPT1 and hCEPT2). Both coding regions predict highly hydrophobic proteins of 43-46.5 kDa with several predicted membrane spanning domains. A CDP-alcohol phosphotransferase motif, DG(x)2AR(x)8G(x)3D(x)3D, has been identified in both hCEPT1 and hCEPT2 choline- and ethanolamine-phosphotransferases (and several other lipid synthesizing enzymes that catalyze the formation of a phosphoester bond by the displacement of CMP from a CDP-alcohol by a second alcohol). Site-directed mutagenesis was used to differentiate the residues responsible for choline- versus ethanolamine-phosphotransferase activity. Mutation of glycine 156 of hCEPT1 abolished ethanolaminephosphotransferase activity, while cholinephosphotransferase activity remained intact.

    摘要翻译: 我们报告了来自哺乳动物来源的能够催化胆碱和乙酰氨基磷酸转移酶反应(hCEPT1和hCEPT2)的蛋白质的首次克隆和表达。 两个编码区都预测43-46.5 kDa的高度疏水性蛋白质,并有几个预测的膜跨膜结构域。 已经在hCEPT1和hCEPT2胆碱和乙醇胺 - 磷酸转移酶(和其他几种催化形成的脂质合成酶)中鉴定了CDP-醇磷酸转移酶基序DG(x)2AR(x)8G(x)3D(x)3D) 的磷酸酯键,通过用CDP-醇由第二个醇置换CMP)。 定点诱变用于区分负责胆碱 - 乙醇胺 - 磷酸转移酶活性的残基。 hCEPT1的甘氨酸156的突变消除了乙醇氨基转染酶活性,而胆碱磷酸转移酶活性保持不变。