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  • 1The First School of Clinical Medicine, Binzhou Medical University, Binzhou, Shandong 256603, China.

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Summary

SPOP-mediated ubiquitination of Sec13, a GATOR2 component, suppresses mTORC1 signaling. This finding reveals SPOP as a tumor suppressor by inhibiting cancer cell proliferation and migration via the mTORC1 pathway.

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Area of Science:

  • Cellular signaling
  • Molecular biology
  • Cancer research

Background:

  • Mammalian target of rapamycin complex1 (mTORC1) regulates metabolism and cell growth in response to amino acids.
  • GATOR2 is crucial in amino acid-mediated mTORC1 signaling by inhibiting GATOR1's GTPase activity (GAP).
  • The precise mechanism by which GATOR2 regulates mTORC1 signaling remains incompletely understood.

Purpose of the Study:

  • To elucidate the role of GATOR2 components in mTORC1 pathway regulation.
  • To investigate the mechanism of GATOR2-mediated suppression of mTORC1 activity.
  • To determine the function of SPOP in breast cancer cell proliferation and migration.

Main Methods:

  • Investigated K63-ubiquitination of Sec13, a GATOR2 component.
  • Utilized SPOP-mediated ubiquitination assays.
  • Assessed the impact of SPOP and Sec13 on mTORC1 activity.
  • Examined breast cancer cell proliferation and migration in vitro.

Main Results:

  • K63-ubiquitination of Sec13 by SPOP suppresses mTORC1 activity by reducing GATOR2 complex interactions.
  • Ubiquitination of Sec13 by SPOP attenuates its interaction with other GATOR2 components, inhibiting mTORC1.
  • SPOP deficiency enhances breast cancer cell proliferation and migration, effects reversed by Sec13 knockdown.

Conclusions:

  • SPOP acts as a tumor suppressor by negatively regulating the mTORC1 signaling pathway through Sec13 ubiquitination.
  • The SPOP-Sec13-GATOR2 axis represents a novel regulatory mechanism in mTORC1 signaling.
  • Targeting the SPOP-mediated pathway could offer therapeutic strategies for breast cancer.