Synthesis of Selectively15N-Labeled 2′-O-{[(Triisopropylsilyl)oxy]methyl}(=tom)-Protected Ribonucleoside Phosphoramidites and Their Incorporation into a Bistable 32Mer RNA Sequence
作者:Philipp Wenter、Stefan Pitsch
DOI:10.1002/hlca.200390330
日期:2003.12
conditions for the conversion of 2′-O-[(triisopropylsilyl)oxy]methyl}(=tom) protected uridine and adenosine nucleosides into the corresponding protected (3-15N)-labeled uridine and cytidine and (1-15N)-labeled adenosine and guanosine nucleosides 4, 6, 12, and 18, respectively (Schemes 1–4). On a DNA synthesizer, the resulting 15N-labeled 2′-O-tom-protected phosphoramidite building blocks 19–22 were efficiently
我们为2'- O -[((三异丙基甲硅烷基)氧基]甲基}(= tom)保护的尿苷和腺苷核苷转化为相应的受保护的(3-15 N)标记的尿苷和胞苷和(1 - 15 N) -标记的腺苷和鸟苷的核苷4,6,12,和18,分别为(方案1 - 4)。在DNA合成,将所得的15 N-标记的2'- ø -汤姆保护的亚磷酰胺构建模块19 - 22被有效地并入双稳态32聚体RNA序列的5个选定位置23(已知采用两种不同的结构)(图1)。通过在H 2 O / D 2 O 9:1中进行2D-HSQC和HNN-COSY实验,可以鉴定出所有碱基配对的15 N标记核苷酸的15 N信号,并将其归因于23种23种共存结构之一。