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Related Experiment Video

Updated: Jan 25, 2026

Detection of Small GTPase Prenylation and GTP Binding Using Membrane Fractionation and GTPase-linked Immunosorbent Assay
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EGO complex at 20: The Rag GTPase-TORC1 nutrient-sensing blueprint.

Claudio De Virgilio1

  • 1Department of Biology, University of Fribourg, Fribourg, Switzerland.

Molecular Cell
|January 23, 2026
PubMed
Summary
This summary is machine-generated.

Scientists uncovered how amino acids signal to the target of rapamycin complex 1 (TORC1), a key growth regulator. This research reveals a conserved mechanism linking nutrient sensing to cell growth across species.

Keywords:
Rag GTPasesSaccharomyces cerevisiaeTOR signalingTORC1TORC2mTORnutrient signalingyeast

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Area of Science:

  • Cellular Biology
  • Molecular Biology
  • Biochemistry

Background:

  • Nutrient signaling pathways regulate cellular growth and metabolism.
  • The target of rapamycin complex 1 (TORC1) is a crucial regulator of cell growth.
  • The precise mechanisms by which amino acids regulate TORC1 remained largely unknown.

Purpose of the Study:

  • To elucidate the molecular mechanisms connecting amino acid availability to TORC1 activation.
  • To identify the key components involved in nutrient sensing and TORC1 regulation.
  • To establish a conserved framework for nutrient-TORC1 coupling across different species.

Main Methods:

  • Utilized Saccharomyces cerevisiae (yeast) as a model organism.
  • Investigated the role of the EGO complex and Rag GTPases in nutrient signaling.
  • Cross-species comparative analysis in flies and mammals.

Main Results:

  • Identified the EGO complex as a crucial link between Rag GTPases and TORC1 reactivation.
  • Demonstrated glutamine as a key metabolite in nutrient sensing.
  • Revealed a conserved mechanism where Rag GTPases integrate amino acid signals for spatial TORC1 control at membranes.
  • Discovered the role of scaffolds, GAP complexes, and nutrient sensors in regulating Rag GTPase activity.

Conclusions:

  • Early yeast research provided foundational insights into nutrient-TORC1 coupling.
  • A conserved cross-species framework for nutrient-TORC1 signaling has been established.
  • Understanding this pathway has broad implications for physiology, disease, and therapeutic strategies.