Cited by 612PI3K/AKT/mTOR signaling in cancerTuberous Sclerosis Complex ResearchAutophagy in Disease and Therapy

TBC1D7 Is a Third Subunit of the TSC1-TSC2 Complex Upstream of mTORC1

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Dibble, Christian C., Elis, Winfried, Menon, Suchithra, Qin, Wei, Klekota, Justin, Asara, John M., Finan, Peter M., Kwiatkowski, David J. +2 more·2012·Molecular Cell

Abstract

The tuberous sclerosis complex (TSC) tumor suppressors form the TSC1-TSC2 complex, which limits cell growth in response to poor growth conditions. Through its GTPase-activating protein (GAP) activity toward Rheb, this complex inhibits the mechanistic target of rapamycin (mTOR) complex 1 (mTORC1), a key promoter of cell growth. Here, we identify and biochemically characterize TBC1D7 as a stably associated and ubiquitous third core subunit of the TSC1-TSC2 complex. We demonstrate that the TSC1-TSC2-TBC1D7 (TSC-TBC) complex is the functional complex that senses specific cellular growth conditions and possesses Rheb-GAP activity. Sequencing analyses of samples from TSC patients suggest that TBC1D7 is unlikely to represent TSC3. TBC1D7 knockdown decreases the association of TSC1 and TSC2 leading to decreased Rheb-GAP activity, without effects on the localization of TSC2 to the lysosome. Like the other TSC-TBC components, TBC1D7 knockdown results in increased mTORC1 signaling, delayed induction of autophagy, and enhanced cell growth under poor growth conditions.

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Crossref · 10.1016/j.molcel.2012.06.009

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  • TBC1D7 is a constitutive member of the TSC complex.

    “A third subunit of TSCC, TBC1D7, was later discovered and shown to be a constitutive member of the complex (Dibble et al., 2012).”

    From Signal integration in the (m)TORC1 growth pathway (2018) · cites this paper as Dibble et al., 2012

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Authors
Dibble, C. C., Elis, W., Menon, S., Qin, W., Klekota, J., Asara, J. M., Finan, P. M., Kwiatkowski, D. J., Murphy, L. O., & Manning, B. D.
Affiliations
  • Harvard University (US)
  • Brigham and Women's Hospital (US)
  • Beth Israel Deaconess Medical Center (US)
Corresponding author
Manning, Brendan D.
Venue
Molecular Cell
Publisher
Elsevier BV
Published
2012-08
Volume
47
Issue
4
Pages
535-546
ISSN
1097-2765 (ISSN-L)
OpenAlex
W1985754630
Cited by
612
References
52
Citations by year
2026: 16 · 2025: 34 · 2024: 39 · 2023: 49 · 2022: 45 · 2021: 57 · 2020: 49 · 2019: 39 · 2018: 60 · 2017: 47 · 2016: 46 · 2015: 51 · 2014: 45 · 2013: 31 · 2012: 4
FWCI
16.83
Type
journal article
Language
en
Open access
Locations
  • Molecular Cell (publishedVersion)
  • PubMed (publishedVersion)
  • Europe PMC (PubMed Central) (acceptedVersion)
  • PubMed Central (acceptedVersion)
Funders
National Cancer Institute (R01CA122617, P01CA120964, P30CA006516)
Topics
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › PI3K/AKT/mTOR signaling in cancer
  • Health Sciences › Medicine › Physiology › Tuberous Sclerosis Complex Research
  • Health Sciences › Medicine › Epidemiology › Autophagy in Disease and Therapy
Keywords
TSC1/TSC2 complex, tuberous sclerosis complex, mTORC1, autophagy, cell growth regulation, tumor suppressor signaling
MeSH terms
Ras Homolog Enriched in Brain Protein, Mechanistic Target of Rapamycin Complex 1, Tuberous Sclerosis Complex 1 Protein, Tuberous Sclerosis Complex 2 Protein, Amino Acid Sequence, Carrier Proteins, HeLa Cells, Humans, Lysosomes, Molecular Sequence Data, Neuropeptides, Protein Binding, Proteins, Tumor Cells, Cultured, Signal Transduction, Monomeric GTP-Binding Proteins, GTPase-Activating Proteins, Tumor Suppressor Proteins, Multiprotein Complexes, Intracellular Signaling Peptides and Proteins, HEK293 Cells, TOR Serine-Threonine Kinases

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