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A molecular dynamics study of nitric oxide in water: diffusion and structure
Zhongwu Zhou1, B D Todd, Karl P Travis
1Centre for Molecular Simulation, Swinburne University of Technology, P.O. Box 218, Hawthorn, Victoria 3122, Australia.
The Journal of Chemical Physics
|August 20, 2005
Summary
Molecular dynamics simulations reveal nitric oxide (NO) does not significantly alter water structure or hydrogen bonding in aqueous solutions. NO molecules exist independently in water at physiological conditions.
Area of Science:
- Physical Chemistry
- Computational Chemistry
- Biophysics
Background:
- Nitric oxide (NO) is a crucial signaling molecule in biological systems.
- Understanding NO's behavior in aqueous environments is vital for physiological studies.
- Previous models may not accurately capture NO-water interactions.
Purpose of the Study:
- To investigate the diffusion and structural impact of nitric oxide in water using molecular dynamics.
- To develop and validate a molecular model for nitric oxide in aqueous simulations.
- To assess the potential for hydrogen bonding between NO and water molecules.
Main Methods:
- Employed molecular dynamics (MD) simulations.
- Utilized a novel two-site rigid-body model for nitric oxide.
- Incorporated the extended simple point-charge (SPC/E) model for water.
- Simulated systems at ambient (298 K) and physiological (310 K) temperatures.
Main Results:
- Simulated diffusion coefficients for NO in water showed good agreement with experimental data.
- Intermolecular pair functions indicated minimal disruption of water structure by NO.
- Little impact on water-water hydrogen bonding was observed.
- No significant hydrogen bond formation between water and NO was detected.
Conclusions:
- Nitric oxide does not substantially alter the structure of liquid water.
- Water-nitric oxide mixtures exhibit minimal hydrogen bonding between the solute and solvent.
- At studied conditions, NO exists as free molecules in water, not as complexes.