Steric Effects in RNA Interference: Probing the Influence of Nucleobase Size and Shape
作者:Alvaro Somoza、Adam P. Silverman、Rand M. Miller、Jijumon Chelliserrykattil、Eric T. Kool
DOI:10.1002/chem.200800837
日期:2008.9.8
Sequence-selectivity studies were carried out at this position with mutated target mRNAs and nucleobase analogues with varied size (2,4-difluoro- and 2,4-dichlorobenzene) and different shape (2,3-dichlorobenzene, 4-methylbenzimidazole). The results point out the importance of nucleobase shape and steric effects in RNA interference.
具有不同大小和形状的非极性核苷已被用于研究氢键稳定和空间效应对RNA干扰的影响。siRNA导链的尿嘧啶和腺嘌呤残基已被尿嘧啶和腺嘌呤的非极性等位基因以及空间变体所取代。针对海肾荧光素酶mRNA的RNAi实验表明,siRNA热稳定性与基因抑制密切相关。有趣的是,在引导链上第7位修饰的siRNA没有遵循这种相关性,尽管具有较低的热稳定性,但仍具有大量的RNAi活性。在此位置进行了具有可变大小(2,4-二氟和2,4-二氯苯)和不同形状(2,3-二氯苯,4-甲基苯并咪唑)的突变靶mRNA和核碱基类似物的序列选择性研究。