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Heavy metal ions are potent inhibitors of protein folding

Sandeep K Sharma1, Pierre Goloubinoff, Philipp Christen

  • 1Biochemisches Institut, Universität Zürich, CH-8057 Zürich, Switzerland.

Biochemical and Biophysical Research Communications
|May 27, 2008
PubMed

Insights

Heavy metals like cadmium, mercury, and lead disrupt protein refolding, causing toxicity. This newly found mechanism impacts both spontaneous and chaperone-assisted protein folding, expanding the known toxic effects of these metals.

Area of Science:

  • Environmental toxicology
  • Biochemistry
  • Molecular biology

Background:

  • Heavy metal exposure (cadmium, mercury, lead) poses significant health risks.
  • Previous research attributed heavy metal toxicity to interactions with native proteins.

Purpose of the Study:

  • To investigate a novel mechanism of heavy metal toxicity.
  • To explore the impact of heavy metal ions on protein refolding.

Main Methods:

  • Studied the effects of cadmium (Cd2+), mercury (Hg2+), and lead (Pb2+) ions.
  • Assessed inhibition of spontaneous and chaperone-assisted protein refolding.
  • Determined half-maximal inhibitory concentrations (IC50).

Main Results:

  • Heavy metal ions efficiently inhibited spontaneous protein refolding by forming high-affinity complexes.
  • These ions also inhibited chaperone-assisted refolding of denatured proteins.
  • Inhibition occurred at nanomolar concentrations, indicating high efficacy.

Conclusions:

  • Heavy metal toxicity can arise from interactions with non-native proteins.
  • This mechanism expands the understanding of heavy metal toxicological scope.
  • The findings suggest broader health implications than previously recognized.

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