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Related Experiment Video

Updated: Dec 24, 2025

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Unlocking SOAR releases STIM.

Joo Young Kim1, Shmuel Muallem

  • 1Department of Pharmacology, Yonsei University, Seoul, Korea.

The EMBO Journal
|May 5, 2011
PubMed
Summary

Researchers discovered an autoinhibitory domain in STIM1 that blocks the SOAR domain, which is essential for store-operated calcium channels (SOCs). Releasing SOAR activates Orai1 channels, crucial for calcium signaling.

Area of Science:

  • Cell Biology
  • Molecular Biology
  • Biochemistry

Background:

  • Store-operated calcium channels (SOCs) are critical for receptor-evoked calcium signaling.
  • STIM1 and Orai1 are key molecular components of SOCs, with STIM1 sensing ER calcium and Orai1 forming the channel pore.
  • Activation of Orai1 by STIM1 involves the STIM1 SOAR/CAD domain interacting with the Orai1 C-terminus.

Purpose of the Study:

  • To elucidate the regulatory mechanisms governing the function of the STIM1 SOAR/CAD domain.
  • To identify the structural elements responsible for the autoinhibition of STIM1 SOAR/CAD.
  • To understand how Orai1 interacts with STIM1 to facilitate channel activation.

Main Methods:

  • Investigated the autoinhibitory domain of STIM1 using biochemical and biophysical techniques.

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  • Examined the interaction between STIM1 and Orai1 using co-immunoprecipitation and structural analyses.
  • Studied the conformational changes in STIM1 upon calcium release and Orai1 binding.

    • Main Results:

    • Identified an autoinhibitory domain within STIM1 that sterically occludes the SOAR/CAD domain.
    • Demonstrated that the release of this autoinhibitory domain is a prerequisite for SOAR/CAD to interact with Orai1.
    • Showed that the Orai1 C-terminus plays a role in facilitating the conformational transition required for SOAR/CAD release and channel activation.

    Conclusions:

    • STIM1 possesses an intrinsic autoinhibitory mechanism that regulates SOAR/CAD activity.
    • Orai1 binding and calcium release from the ER are coordinated events that lead to the activation of store-operated calcium channels.
    • Understanding this regulatory mechanism provides insights into calcium homeostasis and cellular signaling pathways.