期刊
CHEMISTRY-A EUROPEAN JOURNAL
卷 14, 期 26, 页码 7978-7987出版社
WILEY-V C H VERLAG GMBH
DOI: 10.1002/chem.200800837
关键词
base pairs; nucleobases; RNA recognition; RNA structures
资金
- US National Institutes of Health [GM072705]
- Marie Curie OIF Fellowship
- National Science Foundation Graduate Fellowship
- Lieberman Fellowship
- Bing Program
- NATIONAL INSTITUTE OF GENERAL MEDICAL SCIENCES [R01GM072705] Funding Source: NIH RePORTER
Nonpolar nucleosides with varying size and shape have been used to study the hydrogen-bonding stabilization and steric effects on RNA interference. The uracil and adenine residues of siRNA guide strands have been replaced by nonpolar isosteres of uracil and adenine and by steric variants. RNAi experiments targeting Renilla luciferase mRNA have shown close correlation between siRNA thermal stability and gene suppression. Interestingly, siRNA modified at position 7 on the guide strand does not follow this correlation, having substantial RNAi activity despite low thermal stability. 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.
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