Selective 2'-hydroxyl acylation analyzed by primer extension (SHAPE): quantitative RNA structure analysis at single...

Area of Science:

• Biochemistry
• Molecular Biology
• Biophysics

Background:

• RNA backbone flexibility influences RNA structure and function.
• Understanding RNA conformational dynamics is crucial for deciphering biological roles.
• Existing methods may lack single-nucleotide resolution or broad applicability.

Purpose of the Study:

• To present and validate Selective 2'-hydroxyl acylation analyzed by primer extension (SHAPE) as a method for RNA flexibility assessment.
• To demonstrate SHAPE's utility in RNA structure determination and analysis.
• To highlight SHAPE's applicability across various solution environments.

Main Methods:

• RNA nucleotides are acylated at the 2'-hydroxyl group by electrophiles like N-methylisatoic anhydride (NMIA).
• Acylation sites, indicating flexibility, are detected as primer extension stops.
• Electrophoretic separation of extension products quantifies reactivity at single-nucleotide resolution.

Main Results:

• SHAPE accurately scores local nucleotide flexibility for all four ribonucleotides.
• The method exhibits a dynamic range of 20-fold or greater, distinguishing flexible from paired residues.
• SHAPE requires minimal optimization and can be completed within two days for typical RNA sizes.

Conclusions:

• SHAPE provides quantitative insights into RNA local backbone flexibility.
• SHAPE data can refine RNA secondary structure prediction and identify structural variations.
• This technique is valuable for monitoring RNA structural states and ligand interactions.