Cited by 80PI3K/AKT/mTOR signaling in cancerFungal and yeast genetics researchProtein Kinase Regulation and GTPase Signaling

Crystal structure of the Ego1-Ego2-Ego3 complex and its role in promoting Rag GTPase-dependent TORC1 signaling

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Powis, Katie, Zhang, Tianlong, Panchaud, Nicolas, Wang, Rong, Virgilio, Claudio De, Ding, Jianping·2015·Cell Research

Abstract

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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Crossref · 10.1038/cr.2015.86

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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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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
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
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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