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Updated: Mar 30, 2026

Unraveling Entropic Rate Acceleration Induced by Solvent Dynamics in Membrane Enzymes
Published on: January 16, 2016
Challenges within the linear response approximation when studying enzyme catalysis and effects of mutations
Avital Sharir-Ivry1, Rajapandian Varatharaj1, Avital Shurki1
1Institute for Drug Design, School of Pharmacy, The Lise Meitner-Minerva Center for Computational Quantum Chemistry, The Hebrew University of Jerusalem , Jerusalem 91120, Israel.
The linear response approximation (LRA) accurately predicts trends in enzyme reaction barriers across mutants. Sampling convergence is crucial, and specific residues significantly impact energetics, even with small contributions.
Area of Science:
- Computational chemistry
- Enzyme kinetics
- Biophysical modeling
Background:
- Enzyme catalysis is vital in biological processes.
- Accurate calculation of reaction barriers is essential for understanding enzyme mechanisms.
- The linear response approximation (LRA) is a method used in computational studies.
Purpose of the Study:
- To evaluate the linear response approximation (LRA) for calculating enzyme reaction barriers.
- To investigate the impact of scaling electrostatic interactions on barrier calculations.
- To assess the influence of sampling and specific residues on energetic trends in enzyme mutants.
Main Methods:
- Utilized the linear response approximation (LRA) approach.
- Calculated reaction barriers for a wild-type enzyme and its mutants.
- Analyzed the effect of scaling electrostatic interactions.
- Examined convergence based on sampling.
- Assessed the contribution of individual residues.
Main Results:
- Scaling electrostatic interactions minimally affected absolute barrier values but preserved trends between wild-type and mutant enzymes.
- Energetic convergence was dependent on the extent of sampling.
- Individual residues demonstrated significant contributions to the overall energetics, despite their small calculated values.
Conclusions:
- The linear response approximation (LRA) is a viable method for studying trends in enzyme reaction barriers.
- Adequate sampling is critical for reliable energetic calculations.
- Specific residue contributions, though small, are important for a comprehensive understanding of enzyme function.
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