Crystal structure of the Ego1-Ego2-Ego3 complex and its role in promoting Rag GTPase-dependent TORC1 signaling
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The target of rapamycin complex 1 (TORC1) integrates various hormonal and nutrient signals to regulate cell growth, proliferation, and differentiation. Amino acid-dependent activation of TORC1 is mediated via the yeast EGO complex (EGOC) consisting of Gtr1, Gtr2, Ego1, and Ego3. Here, we identify the previously uncharacterized Ycr075w-a/Ego2 protein as an additional EGOC component that is required for the integrity and localization of the heterodimeric Gtr1-Gtr2 GTPases, equivalent to mammalian Rag GTPases. We also report the crystal structure of the Ego1-Ego2-Ego3 ternary complex (EGO-TC) at 2.4 Å resolution, in which Ego2 and Ego3 form a heterodimer flanked along one side by Ego1. Structural data also reveal the structural conservation of protein components between the yeast EGO-TC and the human Ragulator, which acts as a GEF for Rag GTPases. Interestingly, however, artificial tethering of Gtr1-Gtr2 to the vacuolar membrane is sufficient to activate TORC1 in response to amino acids even in the absence of the EGO-TC. Our structural and functional data therefore support a model in which the EGO-TC acts as a scaffold for Rag GTPases in TORC1 signaling.
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The yeast EGOC structure, containing an Ego2-Ego3 heterodimer and the LAMTOR1 homolog Ego1, demonstrated a remarkably similar architecture, with Ego1 overlapping considerably with LAMTOR1, and Ego2 and Ego3 overlapping with LAMTOR5 and LAMTOR2 respectively.
“The yeast EGOC structure, containing an Ego2-Ego3 heterodimer, and the LAMTOR1 homolog Ego1, demonstrated a remarkably similar architecture, with Ego1 overlapping considerably with LAMTOR1, and Ego2 and Ego3 overlapping with LAMTOR5 and LAMTOR2 respectively.”
From Signal integration in the (m)TORC1 growth pathway (2018) · cites this paper as Powis et al., 2015
The pentameric Ragulator complex exhibits an architecture in which heterodimers of LAMTOR2-LAMTOR3 and LAMTOR4-LAMTOR5 are encircled by LAMTOR1, which adopts an extended conformation with short regions of partial α-helicity making contacts with the other Ragulator members.
“The pentameric Ragulator complex exhibits an architecture in which heterodimers of LAMTOR2-LAM-TOR3 and LAMTOR4-LAMTOR5 are encircled by LAM-TOR1, which adopts an extended conformation with short regions of partial α-helicity making contacts with the other Ragulator members.”
From Signal integration in the (m)TORC1 growth pathway (2018) · cites this paper as Powis et al., 2015
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Signal integration in the (m)TORC1 growth pathway
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Amino acid homeostatic control by TORC1 in Saccharomyces cerevisiae under high hydrostatic pressure
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Self-citationConserved Pib2 regions have distinct roles in TORC1 regulation at the vacuole
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Sphingolipids integrate TORC2 with TORC1 through vacuolar liquid-ordered domain formationPreprint
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- Authors
- Powis, K., Zhang, T., Panchaud, N., Wang, R., Virgilio, C. D., & Ding, J.
- Affiliations
- University of Fribourg (CH)
- Chinese Academy of Sciences (CN)
- Corresponding author
- Virgilio, Claudio De
- Ding, Jianping
- Venue
- Cell Research
- Published
- 2015-07-24
- Volume
- 25
- Issue
- 9
- Pages
- 1043-1059
- ISSN
- 1001-0602 (ISSN-L)
- 1748-7838
- PMC
- PMC4559812
- OpenAlex
- W1928922088
- Cited by
- 80
- References
- 40
- Citations by year
- 2026: 5 · 2025: 4 · 2024: 1 · 2023: 6 · 2022: 5 · 2021: 8 · 2020: 6 · 2019: 4 · 2018: 10 · 2017: 21 · 2016: 6 · 2015: 4
- FWCI
- 5.93
- Type
- journal article
- Language
- en
- Open access
- bronze
- doi.org
- Licence
- www.springer.com/tdm (tdm)
- Locations
- Cell Research (publishedVersion)
- PubMed Central (publishedVersion)
- PubMed (publishedVersion)
- reroDoc Digital Library (submittedVersion)
- Funders
- National Science Foundation
- Salt Science Research Foundation
- Schweizerischer Nationalfonds zur Förderung der Wissenschaftlichen Forschung
- National Natural Science Foundation of China (31230017, 31370015)
- Chinese Academy of Sciences (XDB08010302)
- Youth Innovation Promotion Association of the Chinese Academy of Sciences
- Canton de Fribourg
- Youth Innovation Promotion Association
- Topics
- Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › PI3K/AKT/mTOR signaling in cancer
- Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › Fungal and yeast genetics research
- Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › Protein Kinase Regulation and GTPase Signaling
- Keywords
- TORC1 signaling, Rag GTPases, amino acid signaling, guanine nucleotide exchange factor, scaffold proteins, yeast, crystal structure
- MeSH terms
- Amino Acid Sequence, Molecular Sequence Data, Phosphorylation, Saccharomyces cerevisiae, Transcription Factors, Signal Transduction, Sequence Alignment, Protein Serine-Threonine Kinases, Sequence Homology, Amino Acid, Crystallography, X-Ray, Monomeric GTP-Binding Proteins, Protein Structure, Quaternary, Saccharomyces cerevisiae Proteins, Immunoprecipitation
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