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Significant Refinement of Protein Structure Models Using a Residue-Specific Force Field.

Sangni Xun1, Fan Jiang1, Yun-Dong Wu1,2

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|November 18, 2015
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This study demonstrates that accurate force fields and sufficient simulation time can refine protein structures to near-experimental accuracy. Molecular dynamics simulations using the RSFF1 force field significantly improved homology models and experimental structures.

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Area of Science:

  • Computational Biology
  • Structural Biology
  • Biophysics

Background:

  • All-atom explicit-solvent molecular dynamics (MD) simulations are crucial for refining protein structures.
  • Accurate force fields are essential for maintaining native protein structure stability during simulations.
  • Recent CASP experiments provide valuable targets for structure refinement studies.

Purpose of the Study:

  • To evaluate the effectiveness of the residue-specific force field (RSFF1) for protein structure refinement.
  • To assess the impact of simulation length and temperature on structural refinement accuracy.
  • To determine if MD simulations can achieve near-experimental accuracy in protein structure modeling.

Main Methods:

  • Applied the RSFF1 force field to 30 protein refinement targets from CASP experiments.
  • Performed 1.0 μs unrestrained MD simulations at 298 K on experimental structures.
  • Conducted 150 ns MD simulations at 380 K on homology models.
  • Utilized long-time replica-exchange MD simulations for specific targets (TR614, TR624).

Main Results:

  • Unrestrained simulations largely maintained native structures, with minor deviations in flexible regions.
  • MD simulations of homology models yielded an average RMSD improvement of 0.85 Å.
  • Structural improvements correlated with initial homology model accuracy, suggesting consistent refinement.
  • Replica-exchange MD simulations achieved significant RMSD improvements (1.91 Å and 1.36 Å) for TR614 and TR624.

Conclusions:

  • The RSFF1 force field enables realistic refinement of protein structure models.
  • Sufficient conformational sampling through extended MD simulations is key to achieving high accuracy.
  • Protein structure refinement to near-experimental accuracy is achievable using advanced computational methods.