mTOR signaling: RAG GTPases transmit the amino acid signal.

@article{Shaw2008mTORSR,
  title={mTOR signaling: RAG GTPases transmit the amino acid signal.},
  author={Reuben J. Shaw},
  journal={Trends in biochemical sciences},
  year={2008},
  volume={33 12},
  pages={565-8}
}
mTOR (mammalian target of rapamycin) is a highly conserved nutrient-responsive regulator of cell growth that is found in all eukaryotes. The mechanism by which amino acids signal to mTOR has remained one of the largest outstanding questions in the field. Two recent complimentary studies provide compelling evidence that the Rag family of small GTPases is both necessary and sufficient to transmit a positive signal from amino acids to mTOR. 

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