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Probing protein hydration and conformational states in solution

C Reid1, R P Rand

  • 1Department of Biological Sciences, Brock University, St. Catharines, Ontario, Canada.

Biophysical Journal
|March 1, 1997
PubMed
Summary

Polyethylene glycol (PEG) enhances yeast hexokinase

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Area of Science:

  • Biochemistry
  • Enzyme kinetics
  • Protein-ligand interactions

Background:

  • Yeast hexokinase is a crucial enzyme in glycolysis.
  • Understanding enzyme-substrate interactions is key to metabolic regulation.
  • Polyethylene glycol (PEG) is often used to study protein hydration and behavior in solution.

Purpose of the Study:

  • To investigate the effect of polyethylene glycol (PEG) on yeast hexokinase's affinity for glucose.
  • To elucidate the mechanism by which PEG influences enzyme activity, distinguishing between direct protein interaction and indirect water activity effects.

Main Methods:

  • Enzyme kinetics assays were performed on yeast hexokinase in the presence of varying molecular weights of PEG.
  • The binding reaction was analyzed through the lens of osmotic effects, quantifying changes in associated water molecules (delta Nw).

Main Results:

  • PEG increases yeast hexokinase's affinity for glucose.
  • The effect is primarily indirect, mediated by changes in water activity.
  • Increasing PEG molecular weight initially increases the number of excluded water molecules, then PEG dehydrates the unbound enzyme conformation.

Conclusions:

  • PEG's action on hexokinase is indirect, modulating water activity around the enzyme.
  • The enzyme exhibits significant conformational flexibility and explores diverse hydration states in solution, beyond those observed in crystal structures.
  • Osmotic effects of PEG provide insights into the dynamic hydration of enzymes.

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