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Structural titration reveals Ca2+-dependent conformational landscape of the IP3 receptor

Author

Listed:
  • Navid Paknejad

    (Memorial Sloan Kettering Cancer Center
    Weill Cornell Graduate School of Biomedical Sciences)

  • Vinay Sapuru

    (Memorial Sloan Kettering Cancer Center
    Weill Cornell Graduate School of Biomedical Sciences)

  • Richard K. Hite

    (Memorial Sloan Kettering Cancer Center)

Abstract

Inositol 1,4,5-trisphosphate receptors (IP3Rs) are endoplasmic reticulum Ca2+ channels whose biphasic dependence on cytosolic Ca2+ gives rise to Ca2+ oscillations that regulate fertilization, cell division and cell death. Despite the critical roles of IP3R-mediated Ca2+ responses, the structural underpinnings of the biphasic Ca2+ dependence that underlies Ca2+ oscillations are incompletely understood. Here, we collect cryo-EM images of an IP3R with Ca2+ concentrations spanning five orders of magnitude. Unbiased image analysis reveals that Ca2+ binding does not explicitly induce conformational changes but rather biases a complex conformational landscape consisting of resting, preactivated, activated, and inhibited states. Using particle counts as a proxy for relative conformational free energy, we demonstrate that Ca2+ binding at a high-affinity site allows IP3Rs to activate by escaping a low-energy resting state through an ensemble of preactivated states. At high Ca2+ concentrations, IP3Rs preferentially enter an inhibited state stabilized by a second, low-affinity Ca2+ binding site. Together, these studies provide a mechanistic basis for the biphasic Ca2+-dependence of IP3R channel activity.

Suggested Citation

  • Navid Paknejad & Vinay Sapuru & Richard K. Hite, 2023. "Structural titration reveals Ca2+-dependent conformational landscape of the IP3 receptor," Nature Communications, Nature, vol. 14(1), pages 1-20, December.
  • Handle: RePEc:nat:natcom:v:14:y:2023:i:1:d:10.1038_s41467-023-42707-3
    DOI: 10.1038/s41467-023-42707-3
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    References listed on IDEAS

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