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Related Concept Videos

Protein Folding01:22

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Protein Folding01:25

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Controlling the Size, Shape and Stability of Supramolecular Polymers in Water
16:24

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Published on: August 2, 2012

Modeling hydration water and its role in polymer folding.

P Bruscolini1, L Casetti

  • 1Istituto Nazionale per la Fisica della Materia (INFM) and Dipartimento di Fisica, Politecnico di Torino, Corso Duca degli Abruzzi 24, I-10129 Torino, Italy.

Journal of Biological Physics
|January 25, 2013
PubMed
Summary

The hydrophobic effect, crucial for protein folding, arises from water's reduced configurations around non-polar molecules. This model explains protein collapse transitions and can model aromatic and polar solvation.

Keywords:
Watercold unfoldinghydrophobicitypolymer collapseprotein foldingstatistical-mechanical models

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Area of Science:

  • Chemical Physics
  • Physical Chemistry
  • Biophysics

Background:

  • The hydrophobic effect is a primary driver of protein folding into native states.
  • The underlying physics of the hydrophobic effect remains incompletely understood.
  • Understanding solvation forces is key to molecular behavior in aqueous environments.

Purpose of the Study:

  • To develop an exactly solvable model for the solvation of non-polar molecules in water.
  • To elucidate the physical mechanisms driving hydrophobic behavior.
  • To investigate protein-like collapse transitions in polymers and adapt the model for diverse molecules.

Main Methods:

  • Introduction of an exactly solvable statistical mechanics model for solvation.
  • Analysis of the effect of solute presence on water molecule configurations.
  • Application of the model to a non-polar homopolymer in aqueous solution.
  • Adaptation of the model for aromatic and polar molecule solvation.

Main Results:

  • The model demonstrates that reduced water configurations suffice to induce hydrophobic behavior.
  • Clear evidence of both 'cold' and 'warm' collapse transitions was observed in the homopolymer model.
  • These transitions mimic collapse phenomena seen in proteins.
  • The model framework was successfully adapted for aromatic and polar solvation.

Conclusions:

  • The reduced configurational entropy of water molecules is a sufficient explanation for the hydrophobic effect.
  • The developed model provides a quantitative framework for understanding hydrophobic interactions and polymer collapse.
  • The model's adaptability suggests broad applicability in studying molecular solvation in water.