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mTOR substrate phosphorylation in growth control
Stefania Battaglioni1, Don Benjamin1, Matthias Wälchli1
1Biozentrum, University of Basel, Spitalstrasse 41, 4056 Basel, Switzerland.
The target of rapamycin (TOR) kinase regulates cell growth and metabolism. Mammalian TOR complexes mTORC1 and mTORC2 phosphorylate distinct substrates using a common motif, despite sharing a catalytic subunit.
Area of Science:
- Molecular Biology
- Cellular Metabolism
- Biochemistry
Background:
- The target of rapamycin (TOR) is a crucial serine/threonine kinase regulating cell growth and metabolism.
- TOR signaling is activated by nutrients, growth factors, and cellular energy levels.
- TOR exists in two distinct complexes, TORC1 and TORC2, with differing functions.
Purpose of the Study:
- To review and identify all direct substrates of mammalian TOR (mTOR).
- To elucidate how mTORC1 and mTORC2 phosphorylate distinct substrates.
- To understand the substrate recruitment mechanism by mTOR complexes based on structural data.
Main Methods:
- Comprehensive literature review of mTOR signaling.
- Identification of direct mTOR substrates.
- Analysis of structural information regarding mTOR complexes.
Main Results:
- Identified numerous direct substrates for mTOR.
- Demonstrated that mTORC1 and mTORC2 phosphorylate distinct sets of substrates.
- Showed that both complexes utilize a common phosphorylation motif.
Conclusions:
- mTORC1 and mTORC2, despite a shared catalytic subunit, exhibit substrate specificity.
- The two complexes recruit different substrates through distinct mechanisms.
- A common minimal motif is phosphorylated by both mTOR complexes, indicating coordinated regulation.
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