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Hydration of C-H groups in tRNA
P Auffinger1, S Louise-May, E Westhof
1Institut de Biologie Moléculaire et Cellulaire du CNRS, Strasbourg, France.
Faraday Discussions
|January 1, 1996
Summary
Molecular dynamics simulations reveal long-lived water interactions with tRNA. Specific C-H sites, particularly on ribose and pyrimidine, show stable hydration, with some acting as true hydrogen bonds.
Area of Science:
- Biophysics
- Computational Chemistry
- Molecular Biology
Background:
- Transfer RNA (tRNA) plays a crucial role in protein synthesis.
- Understanding tRNA hydration is key to its structure-function relationship.
- C-H...Ow interactions are increasingly recognized in biomolecular hydration.
Purpose of the Study:
- To characterize long-lived C-H...Ow interactions in tRNA(Asp).
- To investigate hydration patterns of the anticodon hairpin and full tRNA.
- To determine the nature of water interactions with specific C-H sites.
Main Methods:
- Multiple Molecular Dynamics (MMD) simulations were employed.
- Particle Mesh Ewald (PME) method used for long-range electrostatics.
- Analysis of 3 ns MMD trajectories for tRNA anticodon and full tRNA.
Main Results:
- Identified C-H sites with very long water molecule residence lifetimes.
- Observed significant hydration around ribose H(3') and pyrimidine H(5) atoms.
- C(3')-H(3')...Ow contacts are opportunistic, driven by polynucleotide structure.
- Pyrimidine H(5) interactions with water exhibit characteristics of bona fide hydrogen bonds.
Conclusions:
- Specific C-H groups in tRNA exhibit stable, long-lived hydration.
- Ribose and pyrimidine C-H interactions with water are structurally significant.
- Pyrimidine H(5) sites act as hydrophilic interaction points, forming strong hydrogen bonds with water.