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Practical Aspects of Sample Preparation and Setup of 1H R1ρ Relaxation Dispersion Experiments of RNA
Published on: July 9, 2021
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RNAs undergo phase transitions with lower critical solution temperatures.
Gable M Wadsworth1, Walter J Zahurancik2, Xiangze Zeng3,4,5
1Department of Physics, The State University of New York at Buffalo, Buffalo, NY, USA.
Nature Chemistry
|November 6, 2023
Summary
RNA molecules can self-assemble into liquid-like droplets through phase separation, driven by their structure and requiring magnesium ions. This process, crucial for cellular organization, can also lead to RNA molecules becoming trapped and losing function.
Area of Science:
- Biochemistry
- Molecular Biology
- Biophysics
Background:
- Ribonucleoprotein granules form through co-phase separation of RNAs and proteins.
- Protein-free RNA phase transitions are poorly understood.
- Physicochemical forces governing RNA-only phase separation require elucidation.
Purpose of the Study:
- To investigate the driving forces behind protein-free RNA phase separation.
- To characterize the properties of RNA-only condensates.
- To understand the functional implications of RNA-driven phase transitions.
Main Methods:
- Studied phase separation of various RNA types.
- Investigated the role of magnesium ions (Mg2+) and RNA bases.
- Analyzed percolation transitions within RNA condensates.
- Assessed the impact on RNase P ribozyme activity.
Main Results:
- Various RNAs undergo entropically driven phase separation with specific lower critical solution temperatures.
- Mg2+ ions and RNA bases modulate phase separation.
- RNA condensates exhibit enthalpically favorable percolation transitions.
- Phase separation and percolation can arrest RNA dynamics and inhibit ribozyme activity.
Conclusions:
- Protein-free RNA phase separation is an intrinsic property driven by the phosphate backbone and modulated by bases and Mg2+.
- RNA-only condensates can undergo percolation, impacting RNA dynamics and function.
- RNA-driven phase transitions are critical for understanding ribonucleoprotein granule biogenesis.
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