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RNA folding and unfolding.

Bibiana Onoa¹, Ignacio Tinoco

¹DuPont Central Research & Development Experimental Station, PO Box 80328, Wilmington, Delaware 19880-0328, USA. G-Bibiana.Onoa@usa.dupont.com

Current Opinion in Structural Biology

|June 15, 2004

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Single-molecule studies reveal RNA folding intermediates and their interconversion rates. Researchers control RNA folding using magnesium ions and force measurements to analyze and predict its hierarchical structure.

Area of Science:

Biophysics
Molecular Biology
Structural Biology

Background:

RNA folding is crucial for its biological functions.
Understanding RNA folding pathways is essential for predicting RNA structures and functions.

Purpose of the Study:

To detail the intermediates and interconversion rates during RNA folding and unfolding.
To explore methods for analyzing and predicting the hierarchical nature of RNA folding.

Main Methods:

Single-molecule studies utilizing fluorescence energy transfer (FRET) to monitor RNA folding.
Applying mechanical force to RNA and measuring end-to-end distance to probe folding dynamics.
Varying magnesium ion concentration to control RNA folding and unfolding.

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Main Results:

Detailed insights into transient intermediates during RNA folding.
Quantification of the rates of interconversion between different folding states.
Demonstration that the hierarchical folding process (secondary then tertiary structure) is amenable to analysis.

Conclusions:

Single-molecule techniques provide unprecedented resolution of RNA folding pathways.
The hierarchical nature of RNA folding facilitates its analysis and prediction.
Control over folding via magnesium ions and force is key to understanding RNA dynamics.