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Area of Science:

  • Biochemistry
  • Biophysics
  • Physical Chemistry

Background:

  • Cellular interiors are crowded environments impacting protein stability.
  • Macromolecular crowding is often explained by entropic volume exclusion.
  • Understanding these effects is crucial for protein folding and function.

Purpose of the Study:

  • To investigate the effects of various cosolutes on protein thermal unfolding.
  • To analyze the enthalpic and entropic contributions to protein stability changes.
  • To challenge and refine existing theories of macromolecular crowding.

Main Methods:

  • Studied the thermal unfolding of ubiquitin using various cosolutes (glucose, dextran, PEG, KCl, urea).
  • Analyzed free energy changes by accounting for the temperature dependence of heat capacity.
  • Compared cosolute effects with predictions from excluded volume theory.

Main Results:

  • Observed enthalpic stabilization and entropic destabilization for glucose, dextran, and PEG, contradicting excluded volume theory.
  • Found similar enthalpic stabilization mechanisms for dextran and its monomer, glucose.
  • Poly(ethylene glycol) primarily caused destabilization due to dominant entropic effects.

Conclusions:

  • Protein stability in crowded environments is complex, involving both enthalpy and entropy.
  • Existing excluded volume theories do not fully capture cosolute effects on protein stability.
  • Proposed a new model classifying cosolute effects based on their enthalpic contributions to protein stability.