Table of Contents
What happens when mTOR is phosphorylated?
mTORC1-mediated phosphorylation of S6K1 aids the assembly of the eukaryotic initiation factor 3 (eIF3) translation initiation complex, while phosphorylation of the translational repressor 4EBP1 induces its release from eIF4E, allowing eIF4E to initiate cap-dependent translation (28, 45).
What does mTORC2 stand for?
mTOR Complex 2 (mTORC2) is an acutely rapamycin-insensitive protein complex formed by serine/threonine kinase mTOR that regulates cell proliferation and survival, cell migration and cytoskeletal remodeling.
What activates mTORC2?
GTPases can activate mTORC2 indirectly via PI3K. Ras-GTP, but not Ras-GDP, interacts with PI3K and increases its activity [91]. Rab35, another small GTPase, was identified in an shRNA screen as a regulator of growth factor-stimulated PI3K signaling [92], which then activates mTORC2.
What is mTORC1 pathway?
mTORC1 integrates signals from multiple growth factors, nutrients, and energy supply to promote cell growth when energy is sufficient and catabolism when the body is hungry. mTORC1 mainly regulates cell growth and metabolism, while mTORC2 mainly controls cell proliferation and survival [1].
Does phosphorylation activate mTOR?
A primary function of mTORC2 is the phosphorylation and activation of Akt through phosphorylation at S473 (9) and the phosphorylation of SGK (10,–12). Due to clinical importance and a further understanding of key metabolic and growth signaling events, dissection of the pathways regulating mTOR is essential.
Is phosphorylated mTOR active?
The phosphorylated mTOR is the phosphorylated form of the mTOR also known as the active form of the mTOR. As we know, mTOR, is a protein kinase acts as a downstream mediator in the PI3K/Akt signaling pathway involving in various celluar functions.
Where is mTORC2 located?
Our imaging results demonstrate that the mTORC2-targeting subunit mSin1 localizes both at membranes and in the cytosol and that its association with the complex is independent from its lipid-binding PH domain. This suggests that mTORC2 could reside both in the cytosol and on membranes.
What inhibits AMPK?
AMPK is also allosterically inhibited by physiological concentrations of phosphocreatine (Ponticos et al., 1998), consistent with the proposed physiological role of the kinase as a sensor of cellular energy status.
Which drugs is mTOR inhibitor?
List of MTOR inhibitors:
| Drug Name | Avg. Rating | Reviews |
|---|---|---|
| Afinitor (Pro) Generic name: everolimus | 5.6 | 19 reviews |
| Torisel (Pro) Generic name: temsirolimus | 9.5 | 2 reviews |
| Zortress (Pro) Generic name: everolimus | 10 | 1 review |
| Rapamune (Pro) Generic name: sirolimus | 10 | 1 review |
What is mTOR responsible for?
The mTOR pathway is a central regulator of mammalian metabolism and physiology, with important roles in the function of tissues including liver, muscle, white and brown adipose tissue, and the brain, and is dysregulated in human diseases, such as diabetes, obesity, depression, and certain cancers.
How is mTOR activated?
Activation of mTOR complex 1 (mTORC1) is triggered by oxidative stress, amino-acid levels and endosomal traffic to the lysosome by small GTPases such as Rab4A. In turn, mTORC1 promotes inflammation by skewing T-cell development.
What is the difference between mTOR and mTORC2?
Specifically, we find that mTORC1 contains mTOR phosphorylated predominantly on S2448 whereas mTORC2 contains mTOR phosphorylated predominantly on S2481.
What is the phospho-s2448 in mTORC2?
The rapamycin-sensitive mTORC1 complex contains phospho-S2448, which is consistent with S2448 phosphorylation being sensitive to acute rapamycin treatment. The rapamycin-insensitive mTORC2 complex contains phospho-S2481, which is consistent with S2481 being a rapamycin-insensitive autophosphorylation site.
Is mTOR s2481 phosphorylation a biomarker for mTORC2 sensitivity to rapamycin treatment?
Our data demonstrate that phosphorylation of S2481 on mTOR is a more direct marker of intact mTORC2 than is phosphorylation of S473 of Akt. We assert that mTOR S2481 phosphorylation is a biomarker that can be used to analyze the sensitivity of mTORC2 to rapamycin treatment in various cancer types.
Is mTORC2 involved in cell adhesion?
The findings suggest that both mTORC1 and mTORC2 control cell adhesion. Since rictor also has mTORC2-independent functions related to regulation of cytoskeleton and cell migration [39–42], to confirm the role of mTORC2 in the regulation of cell adhesion, PP242, an mTOR kinase inhibitor that blocks both mTORC1 and mTORC2, was used.