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Related Experiment Videos

The EF-hand domain: a globally cooperative structural unit.

Melanie R Nelson1, Eva Thulin, Patricia A Fagan

  • 1Department of Molecular Biology, The Scripps Research Institute, La Jolla, California 92037, USA.

Protein Science : a Publication of the Protein Society
|January 16, 2002
PubMed
Summary

EF-hand calcium-binding proteins (Ca2+) modulate signals. A specific mutation in calbindin D(9k) revealed long-range structural effects, showing these domains act as a cooperative unit.

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Area of Science:

  • Biochemistry
  • Structural Biology
  • Molecular Biophysics

Background:

  • EF-hand calcium-binding proteins (Ca2+) are crucial for signal transduction.
  • Homologous EF-hand domains in calbindin D(9k) and calmodulin exhibit distinct calcium-binding responses.
  • Understanding residue-level control of calcium-induced conformational changes is key.

Purpose of the Study:

  • To investigate the relationship between protein sequence, structure, and calcium-binding dynamics.
  • To test hypotheses regarding residues controlling calcium-induced conformational changes.
  • To examine the impact of specific mutations on protein structure and function.

Main Methods:

  • Comparative structural analysis of EF-hand proteins.
  • Site-directed mutagenesis to create the F36G mutation in calbindin D(9k).

Related Experiment Videos

  • Nuclear magnetic resonance (NMR) spectroscopy to determine the 3D structure of the mutant protein in solution.

    • Main Results:

    • The F36G mutation successfully altered helix packing in the calbindin D(9k) apoprotein.
    • NMR analysis revealed significant structural perturbations extending beyond the mutation site.
    • Demonstrated long-range effects, indicating global cooperativity within four-helix EF-hand domains.

    Conclusions:

    • EF-hand domains function as globally cooperative units, not isolated modules.
    • Structural and energetic coupling between residues is critical for protein fold and function.
    • Provides insights into the mechanism of long-range signal transmission in EF-hand proteins.