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Related Experiment Videos

IP(3) receptors: the search for structure.

Colin W Taylor1, Paula C A da Fonseca, Edward P Morris

  • 1Department of Pharmacology, University of Cambridge, Cambridge CB2 1PD, UK. cwt1000@cam.ac.uk

Trends in Biochemical Sciences
|April 15, 2004
PubMed
Summary

Inositol (1,4,5)-trisphosphate receptors (IP3Rs) are calcium channels regulated by calcium and IP3. IP3 binding to IP3Rs promotes calcium binding, destabilizing an inhibitory interaction to open the channel pore.

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Area of Science:

  • Cellular Biology
  • Molecular Physiology
  • Biochemistry

Background:

  • Inositol (1,4,5)-trisphosphate receptors (IP3Rs) are critical intracellular calcium channels.
  • IP3Rs regulate calcium release from intracellular stores, influenced by calcium and IP3 levels.
  • These receptors share structural and functional similarities with ryanodine receptors, offering comparative insights.

Purpose of the Study:

  • To elucidate the structural basis of IP3R gating mechanisms.
  • To understand how IP3 and Ca2+ binding regulate IP3R channel activity.
  • To provide a molecular understanding of calcium signaling pathways involving IP3Rs.

Main Methods:

  • Analysis of intermediate-resolution structures of the complete IP3R.
  • Examination of a high-resolution 2.2-Å structure of the IP3-binding core.

Related Experiment Videos

  • Comparative structural analysis with other tetrameric cation channels, including ryanodine receptors.

    • Main Results:

    • The IP3-binding site is located at the N-terminus of each IP3R subunit.
    • IP3 binding facilitates subsequent Ca2+ binding to the receptor.
    • This dual ligand binding destabilizes an inhibitory interaction between N-terminal and C-terminal domains, leading to channel opening.

    Conclusions:

    • The study reveals a novel mechanism for IP3R channel gating initiated by sequential ligand binding.
    • Understanding IP3R structure-function relationships is crucial for deciphering calcium signaling.
    • These findings contribute to the broader understanding of ion channel regulation and cellular communication.