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Updated: Aug 27, 2025

Practical Aspects of Sample Preparation and Setup of 1H R1ρ Relaxation Dispersion Experiments of RNA

Practical Aspects of Sample Preparation and Setup of ¹H R_1ρ Relaxation Dispersion Experiments of RNA

Published on: July 9, 2021

Measuring RNA UNCG Tetraloop Refolding Dynamics Using Temperature-Jump/Drop Infrared Spectroscopy.

C P Howe¹, G M Greetham², B Procacci¹

¹Department of Chemistry and York Biomedical Research Institute, University of York, Heslington, York YO10 5DD, U.K.

The Journal of Physical Chemistry Letters

|September 27, 2022

Summary

This summary is machine-generated.

This study reveals RNA refolding dynamics using a novel temperature-jump/drop infrared spectroscopy method. RNA stem-loop melting is slower than DNA, but refolding occurs rapidly, suggesting complex intermediate pathways.

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Area of Science:

Molecular Biology
Biophysics
Spectroscopy

Background:

Understanding nucleic acid structural dynamics is crucial for cellular function.
Direct measurement of RNA and DNA strand association and folding is experimentally challenging.

Purpose of the Study:

To investigate the melting and refolding dynamics of RNA and DNA hairpin sequences.
To compare the kinetic differences between RNA and DNA hairpin dynamics.

Main Methods:

Utilized time-resolved temperature-jump/drop infrared spectroscopy.
Measured melting and refolding kinetics of a 12-nucleotide RNA (UACG tetraloop, GC stem) and an equivalent DNA sequence.

Main Results:

RNA stem-loop melting was significantly slower (6.0 ± 0.1 μs at 70 °C) than DNA (0.8 ± 0.1 μs).
Refolding dynamics for both RNA and DNA occurred on similar timescales (approx. 200 μs).
Both melting and refolding followed Arrhenius temperature dependence, with refolding showing negative activation energy.

Conclusions:

Refolding kinetics are similar for RNA and DNA hairpins despite differences in melting rates.
Negative activation energy in refolding suggests a mechanism involving multiple misfolded intermediates before stem zipping.