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Related Experiment Videos

S100A1 and S100B interactions with annexins.

M Garbuglia1, M Verzini, A Hofmann

  • 1Department of Experimental Medicine and Biochemical Sciences, Section of Anatomy, University of Perugia, Italy.

Biochimica Et Biophysica Acta
|December 8, 2000
PubMed
Summary

This study reveals that specific parts of annexin VI interact with S100 proteins, with the C-terminal half blocking S100

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Area of Science:

  • Molecular Biology
  • Protein Interactions
  • Cell Biology

Background:

  • Annexin and S100 proteins form heterotetramers.
  • Annexin VI, but not annexin V, inhibits S100A1/S100B's effect on intermediate filament assembly.

Purpose of the Study:

  • To investigate the binding sites and functional roles of annexin VI halves in S100 protein interactions.
  • To elucidate the mechanism by which S100 proteins affect membrane properties and calcium influx in conjunction with annexins.

Main Methods:

  • Biochemical assays to map binding sites on annexin VI and S100 proteins.
  • Functional assays including liposome stability and calcium influx measurements.
  • Analysis of protein-protein interactions between different annexin and S100 family members.

Main Results:

  • Both N-terminal (VI-a) and C-terminal (VI-b) halves of annexin VI bind S100 proteins at unique sites.
  • Annexin VI-b, not VI-a, inhibits S100A1/S100B's effect on intermediate filament assembly.
  • S100A1/S100B C-terminal extensions are not involved in binding annexin VI.
  • S100 proteins permeabilize liposomes like annexins, and S100-annexin combinations modulate calcium influx differently.

Conclusions:

  • Annexin VI's C-terminal half is crucial for inhibiting S100-mediated effects on intermediate filaments.
  • The C-terminal extension of S100A1/S100B is not the binding interface for annexin VI.
  • S100-annexin interactions are mechanistically diverse, influencing membrane permeability and calcium dynamics.

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