Identification of the tuberous sclerosis complex-2 tumor suppressor gene product tuberin as a target of the phosphoinositide 3-kinase/akt pathway
Open accessAbstract
The S/T-protein kinases activated by phosphoinositide 3-kinase (PI3K) regulate a myriad of cellular processes. Here, we show that an approach using a combination of biochemistry and bioinformatics can identify substrates of these kinases. This approach identifies the tuberous sclerosis complex-2 gene product, tuberin, as a potential target of Akt/PKB. We demonstrate that, upon activation of PI3K, tuberin is phosphorylated on consensus recognition sites for PI3K-dependent S/T kinases. Moreover, Akt/PKB can phosphorylate tuberin in vitro and in vivo. We also show that S939 and T1462 of tuberin are PI3K-regulated phosphorylation sites and that T1462 is constitutively phosphorylated in PTEN(-/-) tumor-derived cell lines. Finally, we find that a tuberin mutant lacking the major PI3K-dependent phosphorylation sites can block the activation of S6K1, suggesting a means by which the PI3K-Akt pathway regulates S6K1 activity.
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TSC2 functions as a GTPase-activating protein to convert active Rheb-GTP to inactive Rheb-GDP, resulting in inhibition of mTOR, the mTORC1 complex, and the mTOR signaling pathway p70S6K.
“TSC2, also known as tuberous sclerosis protein 2, functions as a GTPase-activating protein (GAP) to convert active Rheb-GTP to the inactive GDP-bound form (Rheb-GDP) resulting in the inhibition of mTOR, the mTORC1 complex [26], and the mTOR signaling pathway p70S6K [27].”
From Tuberous Sclerosis Protein 2 (TSC2) Modulates CCN4 Cytoprotection During Apoptotic Amyloid Toxicity in Microglia (2013) · cites this paper as [27]
Akt phosphorylates TSC2 at Thr1462, leading to mTORC1 activation.
“Akt directly phosphorylates TSC2 at Thr1462, resulting in activation of mTORC1 (29).”
From Mislocalization of the Cell Polarity Protein Scribble Promotes Mammary Tumorigenesis and Is Associated with Basal Breast Cancer (2014) · cites this paper as [29]
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“Another major pathway that activates mTORC1 through TSC1/2 is canonical Wnt signaling, which acts by inhibiting glycogen synthase kinase 3b (GSK3b) via an endolysosomal-dependent process (Taelman et al., 2010; Dobrowolski & De Robertis, 2012) that phosphorylates and promotes TSC1/2 activity (Inoki et al., 2006).”
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“One pathway that can modulate and inhibit mTOR activity along with the downstream signaling pathway of p70S6K involves TSC2 [26, 27].”
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- Authors
- Manning, B. D., Tee, A. R., Logsdon, M. N., Blenis, J., & Cantley, L. C.
- Affiliations
- Beth Israel Deaconess Medical Center (US)
- Harvard University (US)
- Corresponding author
- Cantley, Lewis C
- Venue
- Molecular Cell
- Publisher
- Elsevier BV
- Published
- 2002-07
- Volume
- 10
- Issue
- 1
- Pages
- 151-162
- ISSN
- 1097-2765 (ISSN-L)
- OpenAlex
- W2094941511
- Cited by
- 1,555
- References
- 57
- Citations by year
- 2026: 15 · 2025: 26 · 2024: 34 · 2023: 44 · 2022: 54 · 2021: 53 · 2020: 63 · 2019: 50 · 2018: 48 · 2017: 73 · 2016: 67 · 2015: 68 · 2014: 71 · 2013: 89 · 2012: 95
- FWCI
- 25.84
- Type
- journal article
- Language
- en
- Open access
- bronze
- doi.org
- Licence
- Locations
- Molecular Cell (publishedVersion)
- PubMed (publishedVersion)
- Funders
- National Institute of General Medical Sciences (GM 41890, GM51405, R01GM056203, GM 56203, R01GM051405, R01GM041890)
- Topics
- Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › PI3K/AKT/mTOR signaling in cancer
- Health Sciences › Medicine › Physiology › Tuberous Sclerosis Complex Research
- Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › Metabolism, Diabetes, and Cancer
- Keywords
- tuberin, tuberous sclerosis complex 2, phosphatidylinositol 3-kinase, Akt, protein phosphorylation, kinase substrate identification
- MeSH terms
- Tuberous Sclerosis Complex 2 Protein, Amino Acid Sequence, Animals, Binding Sites, Cell Line, Enzyme Activation, Humans, Molecular Weight, Mutation, Phosphoric Monoester Hydrolases, Phosphorylation, Proto-Oncogene Proteins, Repressor Proteins, Substrate Specificity, Tuberous Sclerosis, Tumor Cells, Cultured, Signal Transduction, 3T3 Cells, Protein Serine-Threonine Kinases, Gene Deletion, Phosphatidylinositol 3-Kinases, Ribosomal Protein S6 Kinases, Tumor Suppressor Proteins, Proto-Oncogene Proteins c-akt, PTEN Phosphohydrolase, Mice
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