2. Signaling Pathways
  3. PI3K/Akt/mTOR
  4. mTOR

mTOR

Mammalian target of Rapamycin

mTOR

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mTOR (mammalian target of Rapamycin) is a protein that in humans is encoded by the mTOR gene. mTOR is a serine/threonine protein kinase that regulates cell growth, cell proliferation, cell motility, cell survival, protein synthesis, and transcription. mTOR belongs to the phosphatidylinositol 3-kinase-related kinase protein family. mTOR integrates the input from upstream pathways, including growth factors and amino acids. mTOR also senses cellular nutrient, oxygen, and energy levels. The mTOR pathway is dysregulated in human diseases, such as diabetes, obesity, depression, and certain cancers. Rapamycin inhibits mTOR by associating with its intracellular receptor FKBP12. The FKBP12-rapamycin complex binds directly to the FKBP12-Rapamycin Binding (FRB) domain of mTOR, inhibiting its activity.

mTOR Isoform Specific Products:

mTOR Isoform Comparison
Cat. No. Product Name Effect Purity Chemical Structure
  • HY-10219
    Rapamycin
    		Inhibitor 99.94%
    Rapamycin (Sirolimus; AY 22989) is a potent and specific mTOR inhibitor with an IC50 of 0.1 nM in HEK293 cells. Rapamycin binds to FKBP12 and specifically acts as an allosteric inhibitor of mTORC1. Rapamycin is an autophagy activator, an immunosuppressant.
    Rapamycin
  • HY-B0795
    MHY1485
    		Activator 99.86%
    MHY1485 is a potent cell-permeable mTOR activator that targets the ATP domain of mTOR. MHY1485 inhibits autophagy by suppression of fusion between autophagosomes and lysosomes.
    MHY1485
  • HY-10218
    Everolimus
    		Inhibitor 99.85%
    Everolimus (RAD001) is a Rapamycin (HY-10219) derivative and a potent, selective and orally active mTOR1 inhibitor. Everolimus binds to FKBP-12 to generate an immunosuppressive complex. Everolimus inhibits tumor cells proliferation and induces cell apoptosis and autophagy. Everolimus has potent immunosuppressive and anticancer activities.
    Everolimus
  • HY-13003
    Torin 1
    		Inhibitor 99.08%
    Torin 1 is a potent inhibitor of mTOR with an IC50 of 3 nM. Torin 1 inhibits both mTORC1/2 complexes with IC50 values between 2 and 10 nM. Torin 1 is an effective inducer of autophagy.
    Torin 1
  • HY-10422
    AZD-8055
    		Inhibitor 99.60%
    AZD-8055 is a potent, selective, and orally bioavailable ATP-competitive mTOR kinase inhibitor with an IC50 of 0.8 nM. AZD-8055 inhibits both mTORC1 and mTORC2.
    AZD-8055
  • HY-159480
    AD1058
    		Inhibitor
    AD1058 is an orally active, selective, and blood-brain barrier permeable inhibitor of ATR. AD1058 exhibits in vivo anticancer activity, inhibiting cell proliferation, disrupting the cell cycle, and inducing Apoptosis. AD1058 can be utilized in research on brain and central nervous system metastases stemming from advanced solid tumors.
    AD1058
  • HY-W348485
    WRX606
    		Inhibitor
    WRX606 is an inhibitor for mTOR complex 1 (mTORC1). WRX606 inhibits the phosphorylation of mTORC1 substrate S6 kinase 1 S6K1 (IC50=10 nM), and the phosphorylation of the eukaryotic translation initiation factor 4E binding protein (p-4E-BP1) (IC50=0.27 μM) in MCF-7. WRX606 exhibits cytotoxicity to HepG2 with IC50 of 17 nM. WRX606 exhibits antitumor efficacy in mouse models.
    WRX606
  • HY-10219G
    Rapamycin (GMP)
    		Inhibitor
    Rapamycin (Sirolimus) (GMP) is Rapamycin (HY-10219) produced by using GMP guidelines. GMP small molecules works appropriately as an auxiliary reagent for cell therapy manufacture. Rapamycin is a potent and specific mTOR inhibitor.
    Rapamycin (GMP)
  • HY-13328
    Sapanisertib
    		Inhibitor 99.66%
    Sapanisertib (INK-128; MLN0128; TAK-228) is an orally available, ATP-dependent mTOR1/2 inhibitor with an IC50 of 1 nM for mTOR kinase.
    Sapanisertib
  • HY-N0109
    Salidroside
    		Activator 99.90%
    Salidroside (Rhodioloside) is a prolyl endopeptidase inhibitor. Salidroside alleviates cachexia symptoms in mouse models of cancer cachexia via activating mTOR signalling. Salidroside protects dopaminergic neurons by enhancing PINK1/Parkin-mediated mitophagy.
    Salidroside
  • HY-50673
    Dactolisib
    		Inhibitor 99.94%
    Dactolisib (BEZ235) is an orally active and dual pan-class I PI3K and mTOR kinase inhibitor with IC50s of 4 nM/5 nM/7 nM/75 nM, and 20.7 nM for p110α/p110γ/p110δ/p110β and mTOR, respectively. Dactolisib (BEZ235) inhibits both mTORC1 and mTORC2.
    Dactolisib
  • HY-50910
    Temsirolimus
    		Inhibitor 99.56%
    Temsirolimus is an inhibitor of mTOR with an IC50 of 1.76 μM. Temsirolimus activates autophagy and prevents deterioration of cardiac function in animal model.
    Temsirolimus
  • HY-N0486
    L-Leucine
    		Activator 99.79%
    L-Leucine is an essential branched-chain amino acid (BCAA), which activates the mTOR signaling pathway.
    L-Leucine
  • HY-13002
    Torin 2
    		Inhibitor 99.65%
    Torin 2 is an mTOR inhibitor with EC50 of 0.25 nM for inhibiting cellular mTOR activity, and exhibits 800-fold selectivity over PI3K (EC50: 200 nM). Torin 2 also inhibits DNA-PK with an IC50 of 0.5 nM in the cell free assay. Torin 2 can suppress both mTORC1 and mTORC2.
    Torin 2
  • HY-10115
    PI-103
    		Inhibitor 98.93%
    PI-103 is a potent PI3K and mTOR inhibitor with IC50s of 8 nM, 88 nM, 48 nM, 150 nM, 20 nM, and 83 nM for p110α, p110β, p110δ, p110γ, mTORC1, and mTORC2. PI-103 also inhibits DNA-PK with an IC50 of 2 nM. PI-103 induces autophagy.
    PI-103
  • HY-U00434
    3BDO
    		Activator 99.93%
    3BDO is a new mTOR activator which can also inhibit autophagy.
    3BDO
  • HY-132168
    RMC-5552
    		Inhibitor 98.10%
    RMC-5552 is a potent and selective mTORC1 inhibitor. RMC-5552 inhibits phosphorylation of mTORC1 pS6K and p4EBP1 with IC50s of 0.14 nM and 0.48 nM, respectively. RMC-5552 shows much lower pAKT inhibition (IC50 of 19 nM), resulting in mTORC1/mTORC2 selectivity approaching 40-fold. RMC-5552 has anti-cancer activity.
    RMC-5552
  • HY-111373
    RapaLink-1
    		Inhibitor 99.27%
    RapaLink-1, the third-generation bivalent mTOR inhibitor, combines Rapamycin (HY-10219) with MLN0128 (HY-13328, a second-generation mTOR kinase inhibitor) by an inert chemical linker. RapaLink-1 shows better efficacy than Rapamycin or mTOR kinase inhibitors (TORKi), potently blocking cancer-derived, activating mutants of mTOR. RapaLink-1 can cross the blood-brain barrier. RapaLink-1 binding to FKBP12 results in targeted and durable inhibition of mTORC1. RapaLink-1 plays an antithrombotic role in antiphospholipid syndrome by improving autophagy. Anticancer activity.
    RapaLink-1
  • HY-10297
    Omipalisib
    		Inhibitor 99.93%
    Omipalisib (GSK2126458) is an orally active and highly selective inhibitor of PI3K with Kis of 0.019 nM/0.13 nM/0.024 nM/0.06 nM and 0.18 nM/0.3 nM for p110α/β/δ/γ, mTORC1/2, respectively. Omipalisib has anti-cancer activity.
    Omipalisib
  • HY-N0112
    Dihydromyricetin
    		Inhibitor 98.10%
    Dihydromyricetin is a potent inhibitor with an IC50 of 48 μM on dihydropyrimidinase. Dihydromyricetin can activate autophagy through inhibiting mTOR signaling. Dihydromyricetin suppresses the formation of mTOR complexes (mTORC1/2). Dihydromyricetin is also a potent influenza RNA-dependent RNA polymerase inhibitor with an IC50 of 22 μM.
    Dihydromyricetin
Cat. No. Product Name / Synonyms Application Reactivity
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Download mTOR Signaling Pathway Map.

The mammalian target of rapamycin (mTOR) signaling pathway integrates both intracellular and extracellular signals and serves as a central regulator of cell metabolism, growth, proliferation and survival[1]. mTOR is the catalytic subunit of two distinct complexes called mTORC1 and mTORC2. mTORC1 comprises DEPTOR, PRAS40, RAPTOR, mLST8, mTOR, whereas mTORC2 comprises DEPTOR, mLST8, PROTOR, RICTOR, mSIN1, mTOR[2]. Rapamycin binds to FKBP12 and inhibits mTORC1 by disrupting the interaction between mTOR and RAPTOR. mTORC1 negatively regulates autophagy through multiple inputs, including inhibitory phosphorylation of ULK1 and TFEB. mTORC1 promotes protein synthesis through activation of the translation initiation promoter S6K and through inhibition of the inhibitory mRNA cap binding 4E-BP1, and regulates glycolysis through HIF-1α. It promotes de novo lipid synthesis through the SREBP transcription factors. mTORC2 inhibits FOXO1,3 through SGK and Akt, which can lead to increased longevity. The complex also regulates actin cytoskeleton assembly through PKC and Rho kinase[3]. 

 

Growth factors: Growth factors can signal to mTORC1 through both PI3K-Akt and Ras-Raf-MEK-ERK axis. For example, ERK and RSK phosphorylate TSC2, and inhibit it.

 

Insulin Receptor: The activated insulin receptor recruits intracellular adaptor protein IRS1. Phosphorylation of these proteins on tyrosine residues by the insulin receptor initiates the recruitment and activation of PI3K. PIP3 acts as a second messenger which promotes the phosphorylation of Akt and triggers the Akt-dependent multisite phosphorylation of TSC2. TSC is a heterotrimeric complex comprised of TSC1, TSC2, and TBC1D7, and functions as a GTPase activating protein (GAP) for the small GTPase Rheb, which directly binds and activates mTORC1. mTORC2 primarily functions as an effector of insulin/PI3K signaling. 

 

Wnt: The Wnt pathway activates mTORC1. Glycogen synthase kinase 3β (GSK-3β) acts as a negative regulator of mTORC1 by phosphorylating TSC2. mTORC2 is activated by Wnt in a manner dependent on the small GTPase RAC1[4].

 

Amino acids: mTORC1 senses both lysosomal and cytosolic amino acids through distinct mechanisms. Amino acids induce the movement of mTORC1 to lysosomal membranes, where the Rag proteins reside. A complex named Ragulator, interact with the Rag GTPases, recruits them to lysosomes through a mechanism dependent on the lysosomal v-ATPase, and is essential for mTORC1 activation. In turn, lysosomal recruitment enables mTORC1 to interact with GTP-bound RHEB, the end point of growth factor. Cytosolic leucine and arginine signal to mTORC1 through a distinct pathway comprised of the GATOR1 and GATOR2 complexes.    

 

Stresses: mTORC1 responds to intracellular and environmental stresses that are incompatible with growth such as low ATP levels, hypoxia, or DNA damage. A reduction in cellular energy charge, for example during glucose deprivation, activates the stress responsive metabolic regulator AMPK, which inhibits mTORC1 both indirectly, through phosphorylation and activation of TSC2, as well as directly through the phosphorylation of RAPTOR. Sestrin1/2 are two transcriptional targets of p53 that are implicated in the DNA damage response, and they potently activate AMPK, thus mediating the p53-dependent suppression of mTOR activity upon DNA damage. During hypoxia, mitochondrial respiration is impaired, leading to low ATP levels and activation of AMPK. Hypoxia also affects mTORC1 in AMPK-independent ways by inducing the expression of REDD1, the protein products of which then suppress mTORC1 by promoting the assembly of TSC1-TSC2[2].

 

Reference:

[1]. Laplante M, et al.mTOR signaling at a glance.J Cell Sci. 2009 Oct 15;122(Pt 20):3589-94. 
[2]. Zoncu R, et al. mTOR: from growth signal integration to cancer, diabetes and ageing.Nat Rev Mol Cell Biol. 2011 Jan;12(1):21-35. 
[3]. Johnson SC, et al. mTOR is a key modulator of ageing and age-related disease.Nature. 2013 Jan 17;493(7432):338-45.
[4]. Shimobayashi M, et al. Making new contacts: the mTOR network in metabolism and signalling crosstalk.Nat Rev Mol Cell Biol. 2014 Mar;15(3):155-62.

mTOR Isoform Comparison

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