| Structural highlights
4drh is a 4 chain structure with sequence from Homo sapiens. Full crystallographic information is available from OCA. For a guided tour on the structure components use FirstGlance.
| | Ligands: | , |
| Related: | 4dri, 4drj |
| Gene: | AIG6, FKBP5, FKBP51 (Homo sapiens), FRAP, FRAP1, FRAP2, MTOR, RAFT1, RAPT1 (Homo sapiens) |
| Activity: | Peptidylprolyl isomerase, with EC number 5.2.1.8 |
| Resources: | FirstGlance, OCA, RCSB, PDBsum |
Function
[FKBP5_HUMAN] Interacts with functionally mature heterooligomeric progesterone receptor complexes along with HSP90 and TEBP. [MTOR_HUMAN] Serine/threonine protein kinase which is a central regulator of cellular metabolism, growth and survival in response to hormones, growth factors, nutrients, energy and stress signals. Functions as part of 2 structurally and functionally distinct signaling complexes mTORC1 and mTORC2 (mTOR complex 1 and 2). Activated mTORC1 up-regulates protein synthesis by phosphorylating key regulators of mRNA translation and ribosome synthesis. This includes phosphorylation of EIF4EBP1 and release of its inhibition toward the elongation initiation factor 4E (eiF4E). Moreover, phosphorylates and activates RPS6KB1 and RPS6KB2 that promote protein synthesis by modulating the activity of their downstream targets including ribosomal protein S6, eukaryotic translation initiation factor EIF4B and the inhibitor of translation initiation PDCD4. Regulates ribosome synthesis by activating RNA polymerase III-dependent transcription through phosphorylation and inhibition of MAF1 a RNA polymerase III-repressor. In parallel to protein synthesis, also regulates lipid synthesis through SREBF1/SREBP1 and LPIN1. To maintain energy homeostasis mTORC1 may also regulate mitochondrial biogenesis through regulation of PPARGC1A. mTORC1 also negatively regulates autophagy through phosphorylation of ULK1. Under nutrient sufficiency, phosphorylates ULK1 at 'Ser-758', disrupting the interaction with AMPK and preventing activation of ULK1. Also prevents autophagy through phosphorylation of the autophagy inhibitor DAP. mTORC1 exerts a feedback control on upstream growth factor signaling that includes phosphorylation and activation of GRB10 a INSR-dependent signaling suppressor. Among other potential targets mTORC1 may phosphorylate CLIP1 and regulate microtubules. As part of the mTORC2 complex MTOR may regulate other cellular processes including survival and organization of the cytoskeleton. Plays a critical role in the phosphorylation at 'Ser-473' of AKT1, a pro-survival effector of phosphoinositide 3-kinase, facilitating its activation by PDK1. mTORC2 may regulate the actin cytoskeleton, through phosphorylation of PRKCA, PXN and activation of the Rho-type guanine nucleotide exchange factors RHOA and RAC1A or RAC1B. mTORC2 also regulates the phosphorylation of SGK1 at 'Ser-422'.[1] [2] [3] [4] [5] [6] [7] [8] [9] [10] [11] [12] [13] [14] [15] [16]
Publication Abstract from PubMed
The immunosuppressant and anti-cancer drug rapamycin works by inducing inhibitory protein complexes with the kinase mTOR, an important regulator of growth and proliferation. The obligatory accessory partner of rapamycin is believed to be FKBP12. Here we show that rapamycin complexes of larger FKBP protein family members can tightly bind to mTOR and potently inhibit its kinase activity. Co-crystal structures with FKBP51 and FKBP52 reveal the modified molecular binding mode of these alternative ternary complexes in detail. In cellular model systems, FKBP12 can be functionally replaced by larger FKBPs. When rapamycin dosage is limiting, mTOR inhibition of S6K phosphorylation can be enhanced by FKBP51 overexpression in mammalian cells, whereas FKBP12 is dispensable. FKBP51 could also enable the rapamycin-induced hyperphosphorylation of Akt, which depended on higher FKBP levels compared to rapamycin-induced inhibition of S6K phosphorylation. These insights provide a mechanistic rationale for a preferential mTOR inhibition in specific cells or tissues types by engaging specific FKBP homologs.
Large FK506-binding Proteins Shape the Pharmacology of Rapamycin.,Marz AM, Fabian AK, Kozany C, Bracher A, Hausch F Mol Cell Biol. 2013 Jan 28. PMID:23358420[17]
From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine.
See Also
References
- ↑ Kim DH, Sarbassov DD, Ali SM, King JE, Latek RR, Erdjument-Bromage H, Tempst P, Sabatini DM. mTOR interacts with raptor to form a nutrient-sensitive complex that signals to the cell growth machinery. Cell. 2002 Jul 26;110(2):163-75. PMID:12150925
- ↑ Hara K, Maruki Y, Long X, Yoshino K, Oshiro N, Hidayat S, Tokunaga C, Avruch J, Yonezawa K. Raptor, a binding partner of target of rapamycin (TOR), mediates TOR action. Cell. 2002 Jul 26;110(2):177-89. PMID:12150926
- ↑ Choi JH, Bertram PG, Drenan R, Carvalho J, Zhou HH, Zheng XF. The FKBP12-rapamycin-associated protein (FRAP) is a CLIP-170 kinase. EMBO Rep. 2002 Oct;3(10):988-94. Epub 2002 Sep 13. PMID:12231510 doi:10.1093/embo-reports/kvf197
- ↑ Park IH, Bachmann R, Shirazi H, Chen J. Regulation of ribosomal S6 kinase 2 by mammalian target of rapamycin. J Biol Chem. 2002 Aug 30;277(35):31423-9. Epub 2002 Jun 26. PMID:12087098 doi:10.1074/jbc.M204080200
- ↑ Inoki K, Zhu T, Guan KL. TSC2 mediates cellular energy response to control cell growth and survival. Cell. 2003 Nov 26;115(5):577-90. PMID:14651849
- ↑ Kim DH, Sarbassov DD, Ali SM, Latek RR, Guntur KV, Erdjument-Bromage H, Tempst P, Sabatini DM. GbetaL, a positive regulator of the rapamycin-sensitive pathway required for the nutrient-sensitive interaction between raptor and mTOR. Mol Cell. 2003 Apr;11(4):895-904. PMID:12718876
- ↑ Sarbassov DD, Ali SM, Kim DH, Guertin DA, Latek RR, Erdjument-Bromage H, Tempst P, Sabatini DM. Rictor, a novel binding partner of mTOR, defines a rapamycin-insensitive and raptor-independent pathway that regulates the cytoskeleton. Curr Biol. 2004 Jul 27;14(14):1296-302. PMID:15268862 doi:10.1016/j.cub.2004.06.054
- ↑ Brugarolas J, Lei K, Hurley RL, Manning BD, Reiling JH, Hafen E, Witters LA, Ellisen LW, Kaelin WG Jr. Regulation of mTOR function in response to hypoxia by REDD1 and the TSC1/TSC2 tumor suppressor complex. Genes Dev. 2004 Dec 1;18(23):2893-904. Epub 2004 Nov 15. PMID:15545625 doi:10.1101/gad.1256804
- ↑ Jacinto E, Loewith R, Schmidt A, Lin S, Ruegg MA, Hall A, Hall MN. Mammalian TOR complex 2 controls the actin cytoskeleton and is rapamycin insensitive. Nat Cell Biol. 2004 Nov;6(11):1122-8. Epub 2004 Oct 3. PMID:15467718 doi:10.1038/ncb1183
- ↑ Sarbassov DD, Guertin DA, Ali SM, Sabatini DM. Phosphorylation and regulation of Akt/PKB by the rictor-mTOR complex. Science. 2005 Feb 18;307(5712):1098-101. PMID:15718470 doi:307/5712/1098
- ↑ Garcia-Martinez JM, Alessi DR. mTOR complex 2 (mTORC2) controls hydrophobic motif phosphorylation and activation of serum- and glucocorticoid-induced protein kinase 1 (SGK1). Biochem J. 2008 Dec 15;416(3):375-85. doi: 10.1042/BJ20081668. PMID:18925875 doi:10.1042/BJ20081668
- ↑ Porstmann T, Santos CR, Griffiths B, Cully M, Wu M, Leevers S, Griffiths JR, Chung YL, Schulze A. SREBP activity is regulated by mTORC1 and contributes to Akt-dependent cell growth. Cell Metab. 2008 Sep;8(3):224-36. doi: 10.1016/j.cmet.2008.07.007. PMID:18762023 doi:10.1016/j.cmet.2008.07.007
- ↑ Sancak Y, Peterson TR, Shaul YD, Lindquist RA, Thoreen CC, Bar-Peled L, Sabatini DM. The Rag GTPases bind raptor and mediate amino acid signaling to mTORC1. Science. 2008 Jun 13;320(5882):1496-501. doi: 10.1126/science.1157535. Epub 2008 , May 22. PMID:18497260 doi:10.1126/science.1157535
- ↑ Koren I, Reem E, Kimchi A. DAP1, a novel substrate of mTOR, negatively regulates autophagy. Curr Biol. 2010 Jun 22;20(12):1093-8. doi: 10.1016/j.cub.2010.04.041. Epub 2010, May 27. PMID:20537536 doi:10.1016/j.cub.2010.04.041
- ↑ Michels AA, Robitaille AM, Buczynski-Ruchonnet D, Hodroj W, Reina JH, Hall MN, Hernandez N. mTORC1 directly phosphorylates and regulates human MAF1. Mol Cell Biol. 2010 Aug;30(15):3749-57. doi: 10.1128/MCB.00319-10. Epub 2010 Jun , 1. PMID:20516213 doi:10.1128/MCB.00319-10
- ↑ Hsu PP, Kang SA, Rameseder J, Zhang Y, Ottina KA, Lim D, Peterson TR, Choi Y, Gray NS, Yaffe MB, Marto JA, Sabatini DM. The mTOR-regulated phosphoproteome reveals a mechanism of mTORC1-mediated inhibition of growth factor signaling. Science. 2011 Jun 10;332(6035):1317-22. doi: 10.1126/science.1199498. PMID:21659604 doi:10.1126/science.1199498
- ↑ Marz AM, Fabian AK, Kozany C, Bracher A, Hausch F. Large FK506-binding Proteins Shape the Pharmacology of Rapamycin. Mol Cell Biol. 2013 Jan 28. PMID:23358420 doi:http://dx.doi.org/10.1128/MCB.00678-12
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