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Solvent effect on binding thermodynamics of biopolymers
A Ben-Naim1, K L Ting, R L Jernigan
1Laboratory of Mathematical Biology, National Cancer Institute, National Institutes of Health, Bethesda, Maryland 20892.
Biopolymers
|May 1, 1990
Summary
Solvent-induced hydrogen bonds between hydrophilic groups can significantly enhance biopolymer binding free energy. This water-bridging effect is crucial for molecular recognition, impacting protein interactions.
Area of Science:
- Biophysics
- Statistical Mechanics
- Computational Chemistry
Background:
- Biopolymer interactions are fundamental to biological processes.
- Solvent effects, particularly hydrogen bonding, play a critical role in molecular recognition.
- Understanding indirect solvent-induced forces is key to deciphering binding mechanisms.
Purpose of the Study:
- To investigate the indirect solvent-induced effect on biopolymer binding free energy.
- To elucidate the specific role of solute-solvent hydrogen bonding in these interactions.
- To quantify the contribution of water-bridged hydrogen bonds to binding.
Main Methods:
- Classical statistical mechanics framework.
- Estimation of first-order solvent effects on inter-biopolymer interactions.
- Analysis of crystal structure data for protein surface atom distributions.
Main Results:
- Water-bridged hydrogen bonds between hydrophilic groups significantly enhance binding free energy.
- Calculated protein surface atom distributions show an enhanced peak at 4-5 Å, indicating strong solvent-induced interactions.
- The indirect solvent effect is substantial and potentially crucial for molecular recognition.
Conclusions:
- Solvent-induced interactions, mediated by water bridges, are a significant factor in biopolymer binding.
- These findings have implications for understanding molecular recognition and designing biomolecular interactions.
- The study highlights the importance of considering solvent-mediated forces in biophysical processes.