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Updated: Jul 20, 2026
06:59
Nanomanipulation of Single RNA Molecules by Optical Tweezers
Published on: August 20, 2014
Trapped water molecules are essential to structural dynamics and function of a ribozyme
Maria M Rhodes1, Kamila Réblová, Jirí Sponer
1Department of Chemistry, Single Molecule Analysis Group, University of Michigan, 930 North University Avenue, Ann Arbor, MI 48109-1055, USA.
Summary
Catalytically active ribozymes use coupled hydrogen bonds to transmit structural changes. Specifically bound water molecules are crucial for ribozyme dynamics and function, highlighting their underappreciated roles in noncoding RNA activity.
Area of Science:
- Biochemistry
- Molecular Biology
- Structural Biology
Background:
- Ribozymes are catalytic noncoding RNAs essential for genetic information processing and regulation.
- Their complex structures are key to their catalytic functions.
Purpose of the Study:
- To investigate the dynamic structural rearrangements within a ribozyme from a subviral plant pathogen.
- To understand the role of water molecules in ribozyme structure and function.
Main Methods:
- Explicit-solvent molecular dynamics (MD) simulations.
- Single-molecule fluorescence spectroscopy.
Main Results:
- A coupled hydrogen bonding network was identified, communicating structural changes throughout the catalytic core upon chemical modification.
- Long-residency water molecules, critical for this network, rarely exchange with bulk solvent.
- These structured water molecules form a string potentially involved in base catalysis.
Conclusions:
- Specifically bound water molecules play a vital, underappreciated role in the structural dynamics and catalytic function of noncoding RNAs.
- The findings shed light on the intricate mechanisms governing ribozyme activity.
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