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Area of Science:

  • Biochemistry
  • Molecular Biology
  • Structural Biology

Background:

  • The mammalian target of rapamycin (mTOR) pathway is crucial for regulating cell growth and is implicated in diseases like cancer and diabetes.
  • mTOR functions through two complexes: mTORC1 and mTORC2, with mTORC2's precise mechanisms remaining less understood.
  • Understanding mTORC2 structure is vital for deciphering its role in cellular processes and disease.

Purpose of the Study:

  • To determine the high-resolution structure of mTORC2 using cryo-electron microscopy (cryo-EM).
  • To elucidate the structural basis for mTORC2's rapamycin insensitivity and regulatory mechanisms.
  • To identify novel small-molecule binding sites within the mTORC2 complex.

Main Methods:

  • Cryo-electron microscopy (cryo-EM) to achieve a 3.2-Å resolution reconstruction of mTORC2.
  • Structural analysis to visualize subunit interactions and identify binding pockets.
  • Biochemical assays to investigate the functional implications of identified binding sites.

Main Results:

  • The cryo-EM reconstruction revealed detailed folds of Rictor and SIN1 subunits within mTORC2.
  • The carboxyl-terminal domain of Rictor was identified as responsible for mTORC2's resistance to rapamycin.
  • Two novel binding sites were visualized: an inositol hexakisphosphate (InsP6) pocket in mTOR and an mTORC2-specific nucleotide binding site in Rictor.
  • Structural and biochemical data suggest these sites are involved in folding or ternary interactions rather than direct activity regulation.

Conclusions:

  • The determined structure provides unprecedented insights into mTORC2 assembly and regulation.
  • The identification of Rictor's role in rapamycin insensitivity offers a key distinction from mTORC1.
  • The novel binding sites present potential targets for future development of mTORC2-specific inhibitors.
  • This work lays a foundation for further research into mTORC2 signaling pathways and therapeutic strategies.