Synthesis and transcription studies on 5′-triphosphates derived from 2′-C-branched-uridines: 2′-homouridine-5′-triphosphate is a substrate for T7 RNA polymerase
作者:John B. J. Pavey、Anthony J. Lawrence、Ian A. O'Neil、Stefan Vortler、Richard Cosstick
DOI:10.1039/b314348a
日期:——
The 5'-triphosphates of 2'-hydroxymethyluridine (2'-homouridine) and 2'-hydroxyethyluridine were prepared from the corresponding acetyl-protected nucleosides by initial phosphitylation with 2-chloro-5,6-benzo-1,2,3-dioxaphosphorin-4-one. 2'-Acetamidouridine 5'-triphosphate was prepared in an analogous fashion from uridine 2'-C-, 3'-O-gamma-butyrolactone, in which the 3'-hydroxyl group is internally
2'-羟基甲基尿苷(2'-高尿嘧啶)和2'-羟基乙基尿苷的5'-三磷酸酯是由相应的乙酰基保护的核苷通过用2-氯-5,6-苯并-1,2,3-进行的磷酸化作用而制备的。二氧磷磷-4-一。由尿苷2′-C-,3′-O-γ-丁内酯以类似的方式制备2′-乙酰胺基尿苷5′-三磷酸酯,其中3′-羟基在内部被保护为内酯。随后用氨处理得到所需的三磷酸乙酰氨基酯。研究了所有三种三磷酸酯作为T7 RNA聚合酶的底物和该酶的Y639F突变体。2' 发现在甲基锰的存在下,三磷酸合尿苷是野生型酶的底物,并且被特异地掺入到短RNA转录物中(长度为20和21个核苷酸)。通过其对碱水解的抗性证实了转录物中存在类似物。凝胶电泳分析还表明,可以将2'-同型尿苷与长度为75个核苷酸的转录物多重结合。这是2'-脱氧2'-α-C分支的5'-三磷酸核苷充当T7 RNA聚合酶底物的首次报道。2'-羟乙基-和2'-乙酰氨基-尿苷三磷酸不是酶