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RNA Stability01:53

RNA Stability

Intact DNA strands can be found in fossils, while scientists sometimes struggle to keep RNA intact under laboratory conditions. The structural variations between RNA and DNA underlie the differences in their stability and longevity. Because DNA is double-stranded, it is inherently more stable. The single-stranded structure of RNA is less stable but also more flexible and can form weak internal bonds. Additionally, most RNAs in the cell are relatively short, while DNA can be up to 250 million...
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Monitoring Equilibrium Changes in RNA Structure by 'Peroxidative' and 'Oxidative' Hydroxyl Radical Footprinting
13:41

Monitoring Equilibrium Changes in RNA Structure by 'Peroxidative' and 'Oxidative' Hydroxyl Radical Footprinting

Published on: October 17, 2011

Hydration dependent dynamics in RNA.

Greg L Olsen1, Michael F Bardaro, Dorothy C Echodu

  • 1Department of Chemistry, University of Washington, Seattle, WA 98195, USA.

Journal of Biomolecular NMR
|August 12, 2009
PubMed
Summary
This summary is machine-generated.

RNA dynamics are crucial for function. This study reveals that moderate hydration triggers significant motions in HIV-1 TAR RNA, impacting its structure and dynamics across various timescales.

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Practical Aspects of Sample Preparation and Setup of 1H R1&#961; Relaxation Dispersion Experiments of RNA
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Area of Science:

  • Biophysics
  • Molecular Biology
  • Structural Biology

Background:

  • Local and collective motions are vital for RNA function.
  • RNA molecules exhibit complex dynamics across multiple timescales (ms-ps).
  • Understanding RNA dynamics is key to characterizing its biological roles.

Purpose of the Study:

  • To systematically investigate the effects of hydration on motions in HIV-1 TAR RNA.
  • To probe dynamics at uridine residues in diverse structural contexts.
  • To correlate hydration levels with changes in RNA dynamics.

Main Methods:

  • Deuterium solid-state Nuclear Magnetic Resonance (NMR) spectroscopy.
  • Analysis of (2)H relaxation times and lineshapes.
  • Comparison with solution-state (13)C relaxation measurements.

Main Results:

  • Distinct changes in (2)H relaxation and lineshapes were observed with increasing hydration.
  • Nanosecond-to-microsecond motions, indicative of collective dynamics, emerged at critical hydration levels.
  • Moderate hydration induced dramatic activation of motion, with smaller changes at higher hydration.

Conclusions:

  • Hydration plays a critical role in modulating HIV-1 TAR RNA dynamics.
  • A critical hydration threshold exists for the onset of collective motions.
  • NMR is a powerful tool for studying RNA dynamics as a function of environmental conditions.