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Related Experiment Videos

Polymerization of calsequestrin. Implications for Ca2+ regulation.

HaJeung Park1, Si Wu, A Keith Dunker

  • 1School of Molecular Biosciences, Department of Chemistry, Washington State University, Pullman, WA 99164, USA.

The Journal of Biological Chemistry
|February 21, 2003
PubMed
Summary

Calcium ions (Ca2+) regulate calsequestrin polymerization through a coupled binding and polymerization mechanism. Wild-type protein shows stepwise Ca2+-induced oligomerization, unlike truncation mutants, explaining cardiac calsequestrin

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Area of Science:

  • Biochemistry
  • Molecular Biology
  • Structural Biology

Background:

  • Calsequestrin is a key calcium-binding protein in the sarcoplasmic reticulum.
  • Two dimerization contacts in calsequestrin crystals suggest a Ca2+-regulated polymerization mechanism.
  • This mechanism involves coupled Ca2+ binding and protein polymerization.

Purpose of the Study:

  • To investigate the mechanism of Ca2+-induced calsequestrin polymerization.
  • To compare the polymerization behavior of wild-type canine cardiac calsequestrin with its truncation mutants.
  • To understand the structural basis for differences in Ca2+ binding capacity between cardiac and skeletal calsequestrin.

Main Methods:

  • Intrinsic fluorescence and circular dichroism spectroscopy to assess protein folding and structure.

Related Experiment Videos

  • Static laser light scattering to monitor polymerization.
  • 3,3'-dithiobis sulfosuccinimidyl-propionate cross-linking to study protein interactions.
  • Structural comparison of rabbit skeletal calsequestrin and a homology model of canine cardiac calsequestrin.

    • Main Results:

    • Wild-type and mutant calsequestrins showed similar folding and end-point structures.
    • Wild-type calsequestrin exhibited Ca2+-induced dimerization followed by further oligomerization.
    • Truncation mutants did not display stepwise Ca2+-dependent oligomerization.
    • Structural comparison provided insights into the reduced Ca2+ binding of cardiac calsequestrin.

    Conclusions:

    • The study supports a model of coupled Ca2+ binding and polymerization for calsequestrin.
    • Protein truncation affects Ca2+-induced polymerization, but not initial folding or structure.
    • Structural differences likely explain the lower Ca2+ binding capacity of cardiac calsequestrin compared to skeletal calsequestrin.