Mutation of Gln125 to Asn Selectively Abolishes the Thymidylate Kinase Activity of Herpes Simplex Virus Type 1 Thymidine Kinase
作者:Bart Degrève、Robert Esnouf、Erik De Clercq、Jan Balzarini
DOI:10.1124/mol.59.2.285
日期:2001.2.1
contrast with wild-type HSV-1 TK, which displays both thymidine kinase and thymidylate kinase activities, the HSV-1 TK(Q125N) mutant was unable to phosphorylate pyrimidine nucleoside monophosphates but retained significant phosphorylation activity for thymidine and a series of antiherpetic pyrimidine and purine nucleoside analogs. The abrogation of HSV-1 TK-associated thymidylate kinase activity resulted
单纯疱疹病毒1型(HSV-1)胸苷激酶(TK)具有广泛的底物特异性,为选择性抗疱疹治疗以及最近的自杀基因治疗提供了基础。现在,我们已经构建了HSV-1 TK突变酶,其中天冬酰胺(N)残基在位置125处取代了谷氨酰胺(Q),并评估了此氨基酸变化对酶活性的影响。与同时显示胸苷激酶和胸苷酸激酶活性的野生型HSV-1 TK形成鲜明对比的是,HSV-1 TK(Q125N)突变体无法磷酸化嘧啶核苷单磷酸,但对胸苷和一系列抗疱疹药具有显着的磷酸化活性。嘧啶和嘌呤核苷类似物。废除HSV-1 TK相关的胸苷酸激酶活性导致(E)-5-(2-溴乙烯基)-2'-脱氧尿苷(BVDU)的单磷酸盐形式在转染了HSV的骨肉瘤细胞中累积100倍-1 TK(Q125N)基因与表达野生型HSV-1 TK的骨肉瘤细胞相比。与野生型HSV-1 TK基因转染的骨肉瘤肿瘤细胞相比,BVDU单磷酸积累在HSV-1 TK(Q125N)基因