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Related Experiment Videos

Structural requirements for annexin I-S100C complex-formation

J Seemann1, K Weber, V Gerke

  • 1Department of Biochemistry, Max Planck Institute for Biophysical Chemistry, Göttingen, Federal Republic of Germany.

The Biochemical Journal
|October 1, 1996
PubMed
Summary
This summary is machine-generated.

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Calcium-binding protein S100C interacts with annexin I via specific domains. This protein-protein interaction, crucial for S100C function, is characterized by hydrophobic binding.

Area of Science:

  • Biochemistry
  • Molecular Biology
  • Cell Biology

Background:

  • S100C is a calcium-binding protein regulating cellular targets.
  • Annexin I is an intracellular ligand for S100C.
  • Protein interactions are often calcium-dependent.

Purpose of the Study:

  • To elucidate the structural basis of S100C and annexin I complex formation.
  • To identify the specific binding domains and residues involved in the interaction.
  • To characterize the nature of the S100C-annexin I interaction.

Main Methods:

  • Proteolytic truncation of annexin I.
  • Use of N-terminal annexin I peptides.
  • Liposome co-pelleting and ligand-blotting assays.
  • Analysis of recombinant S100C mutants.

Related Experiment Videos

  • Fluorescence emission spectroscopy.

    • Main Results:

    • The S100C-binding site on annexin I is mapped to the N-terminal 13 residues.
    • Residues D91-194 in S100C's C-terminal extension are essential for annexin I binding.
    • The interaction between S100C and annexin I is hydrophobic.
    • The binding mechanism resembles annexin II-p11 interaction.

    Conclusions:

    • Specific domains in S100C and annexin I mediate their complex formation.
    • The N-terminal region of annexin I and the C-terminal extension of S100C are critical for binding.
    • The hydrophobic nature of the interaction provides insight into S100C's regulatory mechanisms.