Phosphorylation of Uridine and Cytidine Nucleoside Analogs by Two Human Uridine-Cytidine Kinases
作者:An R. Van Rompay、Ameli Norda、Karin Lindén、Magnus Johansson、Anna Karlsson
DOI:10.1124/mol.59.5.1181
日期:2001.5.1
Uridine-cytidine kinases (UCK) have important roles for the phosphorylation of nucleoside analogs that are being investigated for possible use in chemotherapy of cancer. We have cloned the cDNA of two human UCKs. The approximately 30-kDa proteins, named UCK1 and UCK2, were expressed in Escherichia coli and shown to catalyze the phosphorylation of Urd and Cyd. The enzymes did not phosphorylate deoxyribonucleosides
尿苷-胞苷激酶(UCK)对于核苷类似物的磷酸化具有重要作用,正在研究将其用于癌症化学疗法中。我们已经克隆了两个人UCKS的cDNA。大约30kDa的蛋白,称为UCK1和UCK2,在大肠杆菌中表达,并显示出催化Urd和Cyd磷酸化的能力。该酶没有磷酸化脱氧核糖核苷或嘌呤核糖核苷。UCK1 mRNA被检测为约1.8和2.7 kb的两个同种型。2.7kb的条带在研究的组织中普遍表达。骨骼肌,心脏,肝脏和肾脏中存在约1.8 kb的条带。仅在所研究的组织中的胎盘中检测到1.2和2.0 kb的UCK2 mRNA的两个同工型。编码UCK1和UCK2的基因分别定位于9q34.2-9q34.3和1q22-1q23.2染色体。我们测试了28个胞苷和尿苷核苷类似物作为酶的可能底物。所述酶使几种类似物磷酸化,例如6-氮杂尿苷,5-氟尿苷,4-硫尿苷,5-溴尿苷,N(4)-乙酰胞苷,N(4)-苯甲酰基胞苷,5-氟胞