Site-Selective RNA Functionalization via DNA-Induced Structure.

Area of Science:

• Biochemistry
• Molecular Biology
• Chemical Biology

Background:

• Site-specific RNA functionalization is crucial but challenging, especially for in vitro transcribed RNAs.
• Existing methods often result in stochastic modification at non-base-paired 2'-OH groups, limiting precise control.
• Localized RNA modification offers potential for diverse applications, including controlling RNA function and enabling specific labeling.

Purpose of the Study:

• To develop a novel DNA-directed strategy for site-selective RNA functionalization at 2'-OH groups.
• To enable precise control over RNA modification for applications in molecular biology and chemical biology.
• To overcome the limitations of stochastic RNA modification methods.

Main Methods:

• Developed RNA Acylation at Induced Loops (RAIL), a method utilizing complementary DNA oligonucleotides.
• Helper DNA probes create localized gaps or loops in RNA, exposing specific 2'-OH groups for reaction.
• Acylimidazole reagents are used for high-yield conjugation at the targeted, exposed 2'-OH sites.

Main Results:

• RAIL achieves high yields of site-specific 2'-OH conjugation on RNA molecules.
• Optimal helper oligodeoxynucleotide designs and reaction conditions were identified.
• The method successfully controlled localized ribozyme activity and enabled dual-color fluorescent labeling of RNA.

Conclusions:

• The RAIL approach provides a simple and novel strategy for site-selective RNA labeling and control.
• This method is applicable to RNAs of various lengths and origins, offering broad utility.
• RAIL advances the field of RNA functionalization, enabling precise manipulation of RNA molecules.