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Related Experiment Videos

Ligands regulate GroEL thermostability

A K Surin1, N V Kotova, I A Kashparov

  • 1Institute of Protein Research, Russian Academy of Sciences, Moscow Region, Russian Federation.

FEBS Letters
|April 1, 1997
PubMed
Summary
This summary is machine-generated.

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The heat-shock proteins GroEL and GroES are crucial for protein folding. Ions like Mg2+ and K+ stabilize GroEL, while ADP destabilizes it, but GroES binding mitigates ADP

Area of Science:

  • Biochemistry
  • Molecular Biology
  • Protein Folding

Background:

  • Escherichia coli heat-shock proteins GroEL and GroES are molecular chaperones.
  • They facilitate protein folding in an ATP-dependent manner.
  • Understanding their stability and ligand interactions is key to comprehending their function.

Purpose of the Study:

  • To investigate the thermostability of GroEL in the presence of various ligands using scanning microcalorimetry.
  • To elucidate the effects of ions (Mg2+, K+) and nucleotides (ADP) on GroEL structure and function.
  • To examine the influence of GroES interaction on ADP-bound GroEL.

Main Methods:

  • Scanning microcalorimetry to assess protein thermostability.
  • Use of hydrophobic probe (ANS) to monitor conformational changes.

Related Experiment Videos

  • Ellman's reagent assay to quantify accessible SH-groups.
  • Limited proteolysis with trypsin to evaluate protein accessibility.

    • Main Results:

    • Mg2+ and K+ ions stabilize the GroEL molecule against thermal denaturation.
    • ADP destabilizes GroEL, increasing its hydrophobicity and susceptibility to proteolysis and SH-group exposure.
    • Co-incubation of GroEL with GroES and Mg2+-ADP negates the destabilizing effects of ADP on thermal stability and SH-group accessibility, but not hydrophobicity or trypsin accessibility.

    Conclusions:

    • Ligand binding significantly modulates GroEL thermostability and conformation.
    • ADP binding induces conformational changes that expose more sites, but these are masked upon GroES interaction.
    • GroEL-GroES complex formation stabilizes the chaperone against ADP-induced destabilization.