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Preferential binding effects on protein structure and dynamics revealed by coarse-grained Monte Carlo simulation.

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Solute binding to histone H3.1 protein causes abrupt structural collapse, altering protein dynamics and dimensions. This preferential binding significantly impacts protein folding compared to homogeneous solvent models.

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Area of Science:

  • Biophysics
  • Computational Biology
  • Protein Dynamics

Background:

  • Histone proteins are crucial for DNA packaging and gene regulation.
  • Understanding protein behavior in solution is vital for molecular biology.
  • Solute-protein interactions can significantly alter protein structure and function.

Purpose of the Study:

  • To investigate the impact of preferential solute binding on histone H3.1 protein structure and dynamics.
  • To compare simulation results between effective medium and explicit solute fluctuation models.
  • To analyze how varying solute-solvent interaction strength affects protein physical quantities.

Main Methods:

  • Coarse-grained Monte Carlo simulation.
  • Utilized knowledge-based residue-residue and hydropathy-index-based residue-solvent interactions.
  • Analyzed local and global physical quantities, including radius of gyration (Rg) and structure factor S(q).

Main Results:

  • Protein radius of gyration (Rg) showed non-monotonic dependence in an effective medium.
  • Abrupt Rg collapse occurred in a narrow interaction strength range with preferential solute binding.
  • Structure factor S(q) became oscillatory in the collapsed state, indicating segmental correlations.
  • Spatial solute binding fluctuations modified the protein's effective dimension (D) across different conformational states.

Conclusions:

  • Preferential solute binding induces significant structural changes in histone H3.1, distinct from homogeneous solvent effects.
  • Explicit consideration of solute positional fluctuations is crucial for accurately modeling protein behavior.
  • Solute-protein interaction strength dictates protein conformational ensembles and their dimensions.