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Leucine and mTORC1: a complex relationship.

Kayleigh M Dodd1, Andrew R Tee

  • 1Institute of Medical Genetics, Cardiff University, Heath Park, Cardiff, Wales, UK.

American Journal of Physiology. Endocrinology and Metabolism
|February 23, 2012
PubMed
Summary
This summary is machine-generated.

Amino acid availability controls protein synthesis. Leucine, an amino acid, activates mTORC1 signaling, crucial for muscle growth and cellular homeostasis, primarily at lysosomal membranes.

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Area of Science:

  • Cellular Biology
  • Molecular Biology
  • Biochemistry

Background:

  • Amino acid availability is a key regulator of protein synthesis, with muscle cells exhibiting high protein turnover for homeostasis.
  • Mammalian target of rapamycin complex 1 (mTORC1) is a central mediator of protein translation, gene transcription, and autophagy, influenced by intracellular amino acid levels.

Purpose of the Study:

  • To review cellular mechanisms controlling and sensing intracellular amino acid pools.
  • To discuss the role of leucine and mTORC1 in regulating amino acid transport and protein degradation pathways.
  • To explore the integration of energy homeostasis and growth signals converging on mTORC1.

Main Methods:

  • Literature review of current research on amino acid sensing and mTORC1 signaling.
  • Analysis of signaling molecules involved in amino acid transduction to mTORC1, including Rag GTPases, MAP4K3, and Vps34/ULK1.
  • Examination of leucine's specific role in activating mTORC1 and its impact on protein turnover.

Main Results:

  • mTORC1 signaling is primarily coordinated at lysosomal membranes, integrating amino acid availability.
  • Leucine is a potent activator of mTORC1, critical for muscle growth and protein synthesis.
  • Cellular mechanisms involving amino acid transporters (LAT1, SNAT2) and degradation pathways (autophagy, proteasomal) are interconnected with mTORC1.

Conclusions:

  • Intracellular amino acid sensing, particularly by leucine via mTORC1, is fundamental for regulating protein synthesis and cellular homeostasis.
  • Lysosomal localization of mTORC1 signaling is a key hub for integrating nutrient signals.
  • Further research is needed to fully elucidate the significance of leucine in protein turnover and mTORC1 regulation.