Assessment of competing 2′«5′ versus 3′«5′ stackings in solution structure of branched-RNA by 1H- & 31 P-NMR spectroscopy
作者:Christian Sund、Peter Agback、Leo H. Koole、Anders Sandström、Jyoti Chattopadhyaya
DOI:10.1016/s0040-4020(01)88130-8
日期:——
P-O3′ (ζ) and P-05′ (α) boonds is significantly greater for the 2′-phosphate group than for the 3′-phosphate grooup. These results point towards preferential 2′→5′ rather than 3′→5′ base stacked structures in all of these synthetic models of the lariat. This is especially the case for the branched trimer 20 and the pentamer 27 which are part of a naturally occurring lariat structure. Note that the strongest
制备五种新型腺苷磷酸化衍生物,即腺苷2',3'-双(磷酸乙酯)(11),腺苷2',3'-双(磷酸酯(13),腺苷2',3',5'-tris据报道有磷酸乙酯(15),腺苷2',5'-双(乙基磷酸)(17)和腺苷3',5'-双(乙基磷酸)(19)。这些化合物以及甲基β-D-呋喃呋喃糖基双- 2',3'-二乙基磷酸酯(9),被用作参考系统31 P和1 H-NMR上的支链的RNA结构的构象研究20 - 30。化合物11,13,15,17和19保留了分支点腺苷的基本结构元素,而分子内碱基堆积的相互作用被除去了。的31的P-NMR的化学位移20 - 30,对引用的9,11,13,或15,示出了图案,其通常与我们先前从可变温辐射结果一致31P-NMR实验。数据表明,对于2'-磷酸基团,P-O3'(ζ)和P-05'(α)键周围的g,g的贡献明显大于对3'-磷酸基团的贡献。这些结果指向套索里亚特所有这些合成