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IP3 receptors - lessons from analyses ex cellula.

Ana M Rossi1, Colin W Taylor2

  • 1Department of Pharmacology, University of Cambridge, Tennis Court Road, Cambridge CB2 1PD, UK.

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|December 16, 2018
PubMed
Summary

Studies of inositol 1,4,5-trisphosphate receptors (IP3Rs) outside cells reveal their role in calcium release. Structural analysis shows IP3 binding triggers calcium binding, opening the channel.

Keywords:
Bilayer recordingCa2+ channelEndoplasmic reticulumIP3 receptorIon channel structureNuclear patch-clampPermeabilized cellRadioligand bindingRyanodine receptor

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Area of Science:

  • Cellular Biology
  • Molecular Biology
  • Biophysics

Background:

  • Inositol 1,4,5-trisphosphate receptors (IP3Rs) are crucial intracellular channels mediating calcium (Ca2+) release from the endoplasmic reticulum (ER).
  • Understanding IP3R function is vital for cellular signaling pathways.
  • Previous research established the ER as the primary intracellular Ca2+ store activated by IP3.

Purpose of the Study:

  • To review the contributions of ex cellula studies to understanding IP3R behavior.
  • To elucidate the structural mechanisms underlying IP3R gating and Ca2+ release.
  • To integrate findings from various experimental approaches for a comprehensive view of IP3R function.

Main Methods:

  • Analysis of permeabilized cells to identify Ca2+ stores and IP3's role.
  • Radioligand binding assays to determine essential IP3 phosphates for receptor activation.
  • Reconstitution of IP3Rs into lipid bilayers and patch-clamp recordings.
  • Structural analyses of IP3R complexes.

Main Results:

  • Ex cellula studies confirmed the ER as the major Ca2+ store and IP3 as the stimulator of Ca2+ release.
  • Radioligand binding identified the critical role of 4,5-phosphates in IP3R activation, aiding purification and cloning.
  • Reconstitution and electrophysiological studies revealed IP3Rs possess large conductance with weak cation selectivity.
  • Structural data illustrate IP3 binding to the N-terminus triggers pore opening via domain communication and a Ca2+-binding site.

Conclusions:

  • IP3Rs function as tetrameric channels releasing Ca2+ from the ER.
  • Structural insights reveal a mechanism where IP3 binding allosterically controls channel gating through Ca2+ binding.
  • These findings provide a mechanistic basis for IP3-mediated Ca2+ signaling.