Synthesis and characterization of modified nucleotides in the 970 hairpin loop of Escherichia coli 16S ribosomal RNA
作者:N. Dinuka Abeydeera、Christine S. Chow
DOI:10.1016/j.bmc.2009.07.008
日期:2009.8
loop region. Subsequently, stabilities and conformations of the singly and doubly modified RNAs were examined and compared with the corresponding unmodified RNA. Thermodynamic parameters and circular dichroism spectra are presented for the four helix 31 RNA analogues. Surprisingly, methylations in the loop region of helix 31 slightly destabilize the hairpin, which may have subtle effects on ribosome function
6-合成Ô -DPC -2- Ñ -methylguanosine(米2 G)的核苷和相应的5'- ø 5'-DMT-2'- ø -汤姆保护6- ö -DPC -2- Ñ -methylguanosine据报道,亚磷酰胺 [DPC,二苯基氨基甲酰基;DMT, 4,4'-二甲氧基三苯甲基;TOM,[(三异丙基甲硅烷基)氧基]甲基]。亚磷酰胺的可用性允许通过位点选择性掺入 2- N-甲基鸟苷修饰来合成发夹 RNA 。四个 18-nt 发夹 RNA 类似物,代表大肠杆菌的 970 环区域(螺旋 31 或 h31;U960–A975)合成的 16S rRNA 在环区经过和不经过修饰。随后,检查了单一和双重修饰的 RNA 的稳定性和构象,并与相应的未修饰的 RNA 进行了比较。显示了四种螺旋 31 RNA 类似物的热力学参数和圆二色光谱。令人惊讶的是,螺旋 31 环区域的甲基化会轻微破坏发夹结构,这