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Temperature dependent conformational changes in calmodulin.

P Gangola, H C Pant

    Biochemical and Biophysical Research Communications
    |February 28, 1983
    PubMed
    Summary
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    Calcium-bound calmodulin undergoes a reversible conformational change between 22-28°C. This transition temperature is influenced by calcium ion concentration, affecting calmodulin

    Area of Science:

    • Biochemistry
    • Molecular Biology
    • Structural Biology

    Background:

    • Calmodulin (CaM) is a crucial calcium-binding protein involved in numerous cellular signaling pathways.
    • Understanding CaM's conformational dynamics is essential for elucidating its regulatory mechanisms.

    Purpose of the Study:

    • To investigate the temperature-dependent conformational changes of calcium-bound calmodulin.
    • To determine the effect of calcium ion concentration on calmodulin's transition temperature.

    Main Methods:

    • Spectroscopic techniques were employed to monitor calmodulin's structural changes.
    • Varying concentrations of calcium ions were used to study their influence on CaM conformation.

    Main Results:

    Related Experiment Videos

  • Calcium-bound calmodulin exhibits a reversible conformational transition within the 22-28°C range.
  • The transition temperature is directly correlated with calcium ion concentration, occurring at 28°C for fully saturated CaM and 22°C for partially saturated states.
  • The order of calcium ion binding to the four sites differs between the two temperature-dependent conformers.

    • Conclusions:

    • Calmodulin's conformational flexibility is modulated by calcium ion stoichiometry.
    • These findings provide insights into the dynamic nature of calmodulin and its response to varying intracellular calcium levels.