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Related Experiment Videos

Bivalent cations stabilize yeast alcohol dehydrogenase I

X De Bolle1, C Vinals, J Fastrez

  • 1Laboratoire de Biologie Moléculaire Structurale, Unité de Recherche en Biologie Moléculaire, Facultés Universitaires Notre-Dame de la Paix, Rue de Bruxelles 61, B-5000 Namur, Belgium.

The Biochemical Journal
|April 15, 1997
PubMed
Summary

Salt concentration impacts yeast alcohol dehydrogenase (ADH) stability. Divalent cations like Ca2+ and Mg2+ stabilize ADH by preventing unfolding and dissociation, suggesting electrostatic interactions are key to enzyme function.

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Area of Science:

  • Biochemistry
  • Enzyme kinetics
  • Protein stability

Background:

  • Yeast alcohol dehydrogenase (ADH) I stability is sensitive to NaCl concentration.
  • The Hofmeister series suggests electrostatic interactions may influence enzyme inactivation.
  • Divalent cations like CaCl2 and MgCl2 can stabilize ADH at millimolar concentrations.

Purpose of the Study:

  • To investigate the role of salt concentration and specific ions on yeast ADH I thermostability.
  • To elucidate the mechanism by which Ca2+ stabilizes yeast ADH I.
  • To explore the structural basis for Ca2+ binding and its effect on enzyme conformation.

Main Methods:

  • Thermostability assays of yeast ADH I in the presence of various salts (NaCl, CaCl2, MgCl2).
  • Analysis of chimeric ADH enzymes to identify key residues involved in Ca2+ binding.

Related Experiment Videos

  • Three-dimensional modeling of enzyme structure to predict Ca2+ interaction sites.

    • Main Results:

    • NaCl concentration significantly affects yeast ADH I thermostability.
    • Ca2+ stabilizes yeast ADH I by inhibiting both reduced form dissociation and oxidized form unfolding.
    • Ca2+ binding is mediated by Asp-236 and Glu-101; displacement is possible via Met-168 mutation.
    • Electrostatic repulsion is implicated in protein unfolding and dissociation.

    Conclusions:

    • Yeast ADH I stability is modulated by electrostatic interactions and salt concentration.
    • Ca2+ plays a critical role in maintaining yeast ADH I structure and function.
    • Mg2+ is proposed to bind yeast ADH I in vivo, contributing to its stability.