Engineering Human Fhit, a Diadenosine Triphosphate Hydrolase, into an Efficient Dinucleoside Polyphosphate Synthase
作者:Kaisheng Huang、Perry A. Frey
DOI:10.1021/ja0400640
日期:2004.8.1
dinucleoside polyphosphates. Fhit catalyzes the Mg2+-dependent hydrolysis of P1-5'-O-adenosine-P3-5'-O-adenosine triphosphate (Ap3A) to AMP and MgADP. Mutation of His96 to glycine disables Fhit as a catalyst for the hydrolysis of phosphoanhydrides such as Ap3A. However, the mutated enzyme H96G-Fhit efficiently catalyzes the synthesis of phosphoanhydride bonds in reactions of nucleoside-5'-phosphimidazolides
假定的人类肿瘤抑制基因 FHIT 编码 Fhit,即脆弱的组氨酸三联体蛋白。Fhit 被认为参与涉及双核苷多磷酸的信号转导途径。Fhit 催化 P1-5'-O-腺苷-P3-5'-O-三磷酸腺苷 (Ap3A) 依赖 Mg2+ 水解为 AMP 和 MgADP。His96 突变为甘氨酸会使 Fhit 作为磷酸酐(如 Ap3A)水解的催化剂失效。然而,突变酶 H96G-Fhit 在核苷 5'-磷咪唑化物与核苷二磷酸和三磷酸的反应中有效催化磷酸酐键的合成。H96G-Fhit 可用于合成多种二核苷三磷酸和四磷酸。我们在此描述了使用 H96G-Fhit 催化 Ap3A、Ap3C、Ap3G、Ap3T、Ap3U、Cp3U、Tp3U、dAp3U、Ap4A、