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Related Experiment Videos

Rheb binds and regulates the mTOR kinase.

Xiaomeng Long1, Yenshou Lin, Sara Ortiz-Vega

  • 1Diabetes Unit and Medical Services and Department of Molecular Biology, Massachusetts General Hospital, Boston, 02114, USA.

Current Biology : CB
|April 28, 2005
PubMed
Summary

Rheb directly binds to the TOR complex 1, with GTP-bound Rheb activating TOR kinase activity. This interaction is crucial for regulating cell growth and translation.

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Area of Science:

  • Molecular Biology
  • Cell Signaling
  • Biochemistry

Background:

  • The target of rapamycin (TOR) complex 1 (TORC1) regulates mRNA translation via phosphorylation of p70S6K and 4E-BP1.
  • TORC1 activity is dependent on the small GTPase Rheb and inhibited by the TSC1/TSC2 complex, which acts as a Rheb GTPase activator.

Purpose of the Study:

  • To elucidate the direct interaction between Rheb and the TOR complex.
  • To determine the role of Rheb's nucleotide-binding state in TORC1 regulation.

Main Methods:

  • In vivo and in vitro binding assays.
  • Analysis of Rheb mutants with varying GTP-binding capabilities.
  • Assessment of mTOR kinase activity in complex with different Rheb forms.

Main Results:

Related Experiment Videos

  • Rheb binds to TORC1 through interactions with the mTOR catalytic domain and LST8, independent of TSC2 binding.
  • Rheb binding to TORC1 does not require GTP loading but is modulated by GTP and impaired by specific mutations.
  • Nucleotide-deficient Rheb inhibits TORC1, while GTP-bound Rheb enhances mTOR kinase activity.

Conclusions:

  • TORC1 is a direct target of Rheb-GTP.
  • Rheb binding to TORC1 is essential for its kinase activation, linking GTPase activity to translational control.