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Related Experiment Videos

Implications on zinc binding to S100A2.

Michael Koch1, Shibani Bhattacharya, Torsten Kehl

  • 1Department of Biology, University of Konstanz, Universitätsstrasse 10, Postfach M665, 78457 Konstanz, Germany.

Biochimica Et Biophysica Acta
|January 24, 2007
PubMed
Summary
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Zinc ions (Zn2+) regulate the tumor suppressor S100A2 protein, impacting its calcium (Ca2+) binding. This suggests Zn2+ may deactivate S100A2, influencing cellular responses to Ca2+ signals.

Area of Science:

  • Biochemistry
  • Molecular Biology
  • Cell Biology

Background:

  • S100A2 is a nuclear-localized, EF-hand calcium-binding protein functioning as a tumor suppressor.
  • S100A2 exhibits high-affinity binding for both calcium (Ca2+) and zinc ions (Zn2+).

Purpose of the Study:

  • To investigate if Zn2+ acts as a regulatory ion for S100A2, similar to Ca2+.
  • To characterize the mechanism and implications of Zn2+ binding to S100A2.

Main Methods:

  • Competition assays with a Zn2+ chelator (4-(2-pyridylazo)-resorcinol) to determine Zn2+ binding affinity.
  • Site-directed mutagenesis and spectroscopic techniques (using Cd2+ and Co2+ as probes) to identify Zn2+-binding sites.
  • Analysis of Ca2+-binding constants before and after Zn2+ binding.

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Main Results:

  • Apparent Kd of 25 nM for Zn2+ binding to S100A2, indicating physiological relevance in the nucleus.
  • Identification of two Zn2+-binding sites: Site 1 (Cys21, His17) and Site 2 (Cys2, inducing tetramer formation).
  • Zn2+ binding to Site 2 significantly reduces S100A2 affinity for Ca2+ (3-fold and 300-fold decrease in EF-hand affinities).

Conclusions:

  • S100A2 is regulated by both Zn2+ and Ca2+.
  • Zn2+ binding, particularly to Site 2, likely deactivates S100A2 by inhibiting its response to intracellular Ca2+ signals.
  • Zn2+ may play a crucial role in modulating S100A2's tumor suppressor function.