Relation between Protein Intrinsic Normal Mode Weights and Pre-Existing Conformer Populations

Area of Science:

• Biophysics
• Computational Biology
• Protein Dynamics

Background:

• Proteins exist as an ensemble of conformational substates in equilibrium.
• Ligands may shift this equilibrium towards a preferred binding conformation.

Purpose of the Study:

• To investigate the relationship between normal mode analysis and protein kinetic conversion rates.
• To determine if normal mode weights can predict kinetic properties.

Main Methods:

• Utilized normal mode analysis to identify protein conformational changes.
• Calculated ratios of normalized normal mode weights.
• Correlated these ratios with kinetic conversion rate ratios.

Main Results:

• Normalized normal mode weight ratios showed significant correlation with kinetic rate ratios (83% for non-enzymes, 59% for enzymes).
• Direct relationships between eigenvalues and kinetic rates/populations were not observed.

Conclusions:

• Protein normal mode motions are intrinsically linked to protein thermodynamics and kinetics.
• This approach provides insights into the dynamic behavior and functional mechanisms of proteins.