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Related Experiment Videos

Calcium-induced structural changes and domain autonomy in calmodulin

B E Finn1, J Evenäs, T Drakenberg

  • 1Department of Physical Chemistry, Lund University, Sweden.

Nature Structural Biology
|September 1, 1995
PubMed
Summary
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Calcium binding to calmodulin causes significant structural changes in its C-terminal domain, revealing a flexible and autonomous structural unit. This finding is crucial for understanding calmodulin

Area of Science:

  • Biochemistry
  • Structural Biology
  • Molecular Biophysics

Background:

  • Calmodulin is a crucial calcium-binding protein involved in numerous cellular signaling pathways.
  • The carboxy-terminal (C-terminal) domain of calmodulin plays a key role in mediating calcium-dependent interactions.
  • Understanding the structural dynamics of calmodulin upon calcium binding is essential for elucidating its function.

Purpose of the Study:

  • To determine the solution structures of the apo (calcium-free) and Ca2+-bound forms of the calmodulin C-terminal domain.
  • To investigate the structural rearrangements induced by calcium binding in this domain.
  • To assess the structural autonomy of the calmodulin C-terminal domain.

Main Methods:

  • Multidimensional heteronuclear nuclear magnetic resonance (NMR) spectroscopy was employed.

Related Experiment Videos

  • Solution structures of both apo and (Ca2+)2 forms were determined.

    • Main Results:

    • Both apo and Ca2+-bound forms of the calmodulin C-terminal domain adopt well-defined structures with similar secondary structures.
    • Calcium binding induces major rearrangements in secondary structure elements, with inter-residue distance changes up to 15 Å.
    • Calcium binding leads to the exposure of the hydrophobic interior of the four-helix bundle.

    Conclusions:

    • The calmodulin C-terminal domain is structurally autonomous, functioning independently of other calmodulin regions.
    • Calcium binding significantly alters the domain's conformation, exposing its hydrophobic core.
    • These findings provide critical insights into the mechanism of calmodulin's calcium-sensing and signaling functions.