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Related Experiment Videos

Time sensing by NAADP receptors.

Dev Churamani1, George D Dickinson, Mathias Ziegler

  • 1Department of Physiology, University College London, Gower Street, London WC1E 6BT, UK.

The Biochemical Journal
|March 23, 2006
PubMed
Summary

Nicotinic acid-adenine dinucleotide phosphate (NAADP) receptors exhibit a unique stabilization mechanism in sea urchin eggs. This process allows NAADP receptors to "remember" activation duration, crucial for calcium signaling.

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Area of Science:

  • Cellular signaling
  • Molecular biology
  • Calcium signaling pathways

Background:

  • Nicotinic acid-adenine dinucleotide phosphate (NAADP) is an intracellular messenger regulating Ca2+ increases.
  • The precise mechanism of NAADP ligand binding and target protein regulation remains largely unknown.
  • Understanding NAADP receptor dynamics is critical for deciphering cellular calcium homeostasis.

Purpose of the Study:

  • To investigate the mechanism of NAADP receptor regulation by its ligand.
  • To elucidate how ligand binding influences NAADP receptor stability and function.
  • To characterize the temporal aspects of NAADP receptor activation and stabilization.

Main Methods:

  • Experiments utilizing sea urchin egg NAADP receptors.
  • Assessment of receptor dissociation following varying durations of NAADP exposure and delipidation.

Related Experiment Videos

  • Investigation of stabilization kinetics at different temperatures and in the presence/absence of cytosolic factors.

    • Main Results:

    • NAADP receptors undergo time-dependent stabilization upon ligand binding.
    • Receptors exposed to NAADP for shorter durations dissociated more readily.
    • Stabilization developed over minutes at picomolar NAADP concentrations and was temperature-dependent.

    Conclusions:

    • NAADP receptors possess a molecular memory, detecting the duration of ligand activation.
    • This stabilization mechanism is independent of cytosolic factors and ligand presence after stabilization.
    • The findings provide novel insights into the regulation of calcium signaling by NAADP.