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Related Experiment Videos

Ionization-reactivity relationships for cysteine thiols in polypeptides

G Bulaj1, T Kortemme, D P Goldenberg

  • 1Department of Biology, University of Utah, Salt Lake City 84112-0840, USA.

Biochemistry
|June 24, 1998
PubMed
Summary

Thiol-disulfide exchange reactions are crucial for cellular processes. Electrostatic interactions significantly influence reaction rates, impacting protein folding and biological regulation.

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Area of Science:

  • Biochemistry
  • Chemical Biology

Background:

  • Thiol-disulfide exchange reactions are fundamental to cellular metabolism, including protein folding, electron transfer, and regulatory mechanisms.
  • Understanding factors that modulate these reaction rates in polypeptides is essential for biological process comprehension.

Purpose of the Study:

  • To investigate the influence of peptide and disulfide reagent properties on thiol-disulfide exchange reaction kinetics.
  • To elucidate the role of electrostatic interactions in determining the rates of these reactions in biological molecules.

Main Methods:

  • Measured the reactivities of cysteine (Cys) thiols in 16 model peptides with varying thiol pKas.
  • Assessed the rates of thiol-disulfide exchange with four different disulfide-bonded compounds: cystine, 2-hydroxyethyl disulfide, oxidized glutathione, and cystamine.

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Main Results:

  • Observed Bronsted correlations between reaction rate and pKa for neutral disulfide reagents, consistent with model compounds.
  • Found deviations from typical Bronsted correlations with charged disulfide reagents (oxidized glutathione and cystamine).
  • Attributed differences in apparent Bronsted coefficients primarily to electrostatic interactions between charged peptide and reagent groups.

Conclusions:

  • Electrostatic interactions play a dominant role in modulating thiol-disulfide exchange rates in biological molecules.
  • These findings provide a better framework for predicting reaction rates and controlling disulfide bond formation in biological systems.
  • Insights can guide strategies to minimize or enhance reaction rates for specific applications, such as analyzing disulfide-coupled folding or favoring particular disulfide formations.