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Area of Science:

  • Computational Chemistry
  • Biophysics
  • Molecular Dynamics

Background:

  • Trimethylamine N-oxide (TMAO) is an osmolyte known to stabilize protein structures against denaturation.
  • TMAO's stabilizing effect is primarily mediated through its interactions with water molecules, as it is excluded from protein surfaces.
  • Understanding the precise mechanism of TMAO-water interactions is crucial for explaining its role in protein stability.

Purpose of the Study:

  • To investigate the structural and dynamical properties of water molecules in the vicinity of TMAO molecules.
  • To elucidate the molecular interactions governing the hydration shell of TMAO.
  • To provide insights into the exclusion of TMAO from protein surfaces based on its hydration structure.

Main Methods:

  • Development and application of a new atomistic force field for TMAO, compatible with standard water models (SPC, TIP3P, TIP4P) and the OPLS force field.
  • Utilization of a dual-resolution modeling approach, combining atomistic simulations with multiscale coarse-graining (MS-CG) force fields derived from atomistic data.
  • Analysis of dynamical and structural properties to understand TMAO-water interactions and the resulting water network.

Main Results:

  • TMAO molecules strongly bind two to three water molecules in their hydration shell.
  • Surprisingly, the methyl groups of TMAO exhibit repulsive interactions with both other methyl groups and surrounding water molecules.
  • This repulsion of water molecules leads to the formation of a clathrate-like hydrogen bond network around TMAO.

Conclusions:

  • The observed repulsive interactions between TMAO's methyl groups and water challenge the conventional hydrophobic effect model.
  • The unique, clathrate-like water structure around TMAO is a key factor in its osmolytic activity and protein stabilization.
  • The peculiar hydration shell likely drives TMAO exclusion from protein surfaces, preventing close contact and maintaining protein integrity.