Synthesis and biological activity of 5-fluoro-2',3'-dideoxy-3'-fluorouridine and its 5'-phosphate
作者:Sudhir Ajmera、Ashok R. Bapat、Kathleen Danenberg、Peter V. Danenberg
DOI:10.1021/jm00367a003
日期:1984.1
5-Fluoro-2',3'-dideoxy-3'-fluorouridine (3'-FFdUrd) and 5-fluoro-2',3'-dideoxy-3'-fluorouridine 5'-phosphate (3'-FFdUMP) have been synthesized, and their interactions with thymidine (dThd) phosphorylase and thymidylate (dTMP) synthetase, respectively, have been examined. 3'-FFdUrd is not a substrate for dThd phosphorylase, but is a weak, noncompetitive inhibitor (Ki = 1.7 mM). 3'-FFdUMP inhibits dTMP
5-氟-2',3'-二脱氧-3'-氟尿苷(3'-FFdUrd)和5-氟-2',3'-二脱氧-3'-氟尿苷5'-磷酸(3'-FFdUMP)具有合成,并检查了它们与胸苷(dThd)磷酸化酶和胸苷酸(dTMP)合成酶的相互作用。3'-FFdUrd不是dThd磷酸化酶的底物,而是一种弱的,非竞争性的抑制剂(Ki = 1.7 mM)。当底物和抑制剂同时存在时,3'-FFdUMP与脱氧尿苷酸酯竞争性抑制dTMP合成酶(Ki = 0.13 mM)。但是,在5,10-亚甲基四氢叶酸存在下,抑制作用会随着时间以一阶方式增加(konobsd = 0.029 s-1)。[6-3H] 3'-FFdUMP与dTMP合成酶之间形成复合物,该复合物可在硝酸纤维素滤膜上分离,并且其解离速率(koffobsd = 1.4 X 10(-2)min-1)与有效抑制剂5-氟-2'-脱氧尿酸酯的解离速率(koffobsd = 1.3