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Open data
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Basic information
Entry | Database: PDB / ID: 8adl | |||||||||
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Title | Cryo-EM structure of the SEA complex | |||||||||
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![]() | SIGNALING PROTEIN / GTPase activating protein / coatomer / TOR signaling | |||||||||
Function / homology | ![]() urea transport / GATOR1 complex / negative regulation of small GTPase mediated signal transduction / GATOR2 complex / pseudohyphal growth / Seh1-associated complex / positive regulation of ER to Golgi vesicle-mediated transport / proline transport / protein exit from endoplasmic reticulum / COPII-mediated vesicle transport ...urea transport / GATOR1 complex / negative regulation of small GTPase mediated signal transduction / GATOR2 complex / pseudohyphal growth / Seh1-associated complex / positive regulation of ER to Golgi vesicle-mediated transport / proline transport / protein exit from endoplasmic reticulum / COPII-mediated vesicle transport / COPII-coated vesicle budding / nuclear pore localization / regulation of TORC1 signaling / nuclear pore outer ring / COPII vesicle coat / TORC1 signaling / positive regulation of protein exit from endoplasmic reticulum / Transport of Mature mRNA derived from an Intron-Containing Transcript / Regulation of HSF1-mediated heat shock response / regulation of autophagosome assembly / SUMOylation of SUMOylation proteins / fungal-type vacuole / SUMOylation of RNA binding proteins / structural constituent of nuclear pore / negative regulation of TOR signaling / cellular response to nitrogen starvation / SUMOylation of chromatin organization proteins / nucleocytoplasmic transport / vacuolar membrane / fungal-type vacuole membrane / positive regulation of macroautophagy / positive regulation of TOR signaling / mRNA transport / meiotic cell cycle / positive regulation of autophagy / nuclear pore / signaling adaptor activity / ERAD pathway / negative regulation of TORC1 signaling / positive regulation of TORC1 signaling / cellular response to amino acid starvation / GTPase activator activity / cell periphery / protein import into nucleus / nuclear envelope / protein transport / cellular response to oxidative stress / nuclear membrane / intracellular signal transduction / response to xenobiotic stimulus / endoplasmic reticulum membrane / positive regulation of DNA-templated transcription / structural molecule activity / endoplasmic reticulum / metal ion binding / cytoplasm / cytosol Similarity search - Function | |||||||||
Biological species | ![]() ![]() | |||||||||
Method | ELECTRON MICROSCOPY / single particle reconstruction / cryo EM / Resolution: 2.95 Å | |||||||||
![]() | Tafur, L. / Loewith, R. | |||||||||
Funding support | European Union, 2items
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![]() | ![]() Title: Cryo-EM structure of the SEA complex. Authors: Lucas Tafur / Kerstin Hinterndorfer / Caroline Gabus / Chiara Lamanna / Ariane Bergmann / Yashar Sadian / Farzad Hamdi / Fotis L Kyrilis / Panagiotis L Kastritis / Robbie Loewith / ![]() ![]() Abstract: The SEA complex (SEAC) is a growth regulator that acts as a GTPase-activating protein (GAP) towards Gtr1, a Rag GTPase that relays nutrient status to the Target of Rapamycin Complex 1 (TORC1) in ...The SEA complex (SEAC) is a growth regulator that acts as a GTPase-activating protein (GAP) towards Gtr1, a Rag GTPase that relays nutrient status to the Target of Rapamycin Complex 1 (TORC1) in yeast. Functionally, the SEAC has been divided into two subcomplexes: SEACIT, which has GAP activity and inhibits TORC1, and SEACAT, which regulates SEACIT. This system is conserved in mammals: the GATOR complex, consisting of GATOR1 (SEACIT) and GATOR2 (SEACAT), transmits amino acid and glucose signals to mTORC1. Despite its importance, the structure of SEAC/GATOR, and thus molecular understanding of its function, is lacking. Here, we solve the cryo-EM structure of the native eight-subunit SEAC. The SEAC has a modular structure in which a COPII-like cage corresponding to SEACAT binds two flexible wings, which correspond to SEACIT. The wings are tethered to the core via Sea3, which forms part of both modules. The GAP mechanism of GATOR1 is conserved in SEACIT, and GAP activity is unaffected by SEACAT in vitro. In vivo, the wings are essential for recruitment of the SEAC to the vacuole, primarily via the EGO complex. Our results indicate that rather than being a direct inhibitor of SEACIT, SEACAT acts as a scaffold for the binding of TORC1 regulators. | |||||||||
History |
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Structure visualization
Structure viewer | Molecule: ![]() ![]() |
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Downloads & links
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Download
PDBx/mmCIF format | ![]() | 2.4 MB | Display | ![]() |
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PDB format | ![]() | 1.9 MB | Display | ![]() |
PDBx/mmJSON format | ![]() | Tree view | ![]() | |
Others | ![]() |
-Validation report
Arichive directory | ![]() ![]() | HTTPS FTP |
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-Related structure data
Related structure data | ![]() 15364MC ![]() 8ae6C M: map data used to model this data C: citing same article ( |
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Similar structure data | Similarity search - Function & homology ![]() |
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Links
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Assembly
Deposited unit | ![]()
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1 |
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Components
-Protein , 6 types, 18 molecules CQEDFMLNGBOJHPAIWX
#1: Protein | Mass: 131104.062 Da / Num. of mol.: 2 / Source method: isolated from a natural source / Source: (natural) ![]() ![]() #2: Protein | Mass: 39170.758 Da / Num. of mol.: 6 / Source method: isolated from a natural source / Source: (natural) ![]() ![]() #3: Protein | Mass: 117775.750 Da / Num. of mol.: 4 / Source method: isolated from a natural source / Source: (natural) ![]() ![]() #4: Protein | Mass: 33082.965 Da / Num. of mol.: 2 / Source method: isolated from a natural source / Source: (natural) ![]() ![]() #5: Protein | Mass: 149533.297 Da / Num. of mol.: 2 / Source method: isolated from a natural source / Source: (natural) ![]() ![]() #7: Protein | Mass: 182203.359 Da / Num. of mol.: 2 / Source method: isolated from a natural source / Source: (natural) ![]() ![]() |
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-Nitrogen permease regulator ... , 2 types, 4 molecules UVST
#6: Protein | Mass: 130141.094 Da / Num. of mol.: 2 / Source method: isolated from a natural source / Source: (natural) ![]() ![]() #8: Protein | Mass: 69937.547 Da / Num. of mol.: 2 / Source method: isolated from a natural source / Source: (natural) ![]() ![]() |
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-Non-polymers , 1 types, 28 molecules ![](data/chem/img/ZN.gif)
#9: Chemical | ChemComp-ZN / |
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-Details
Has ligand of interest | N |
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-Experimental details
-Experiment
Experiment | Method: ELECTRON MICROSCOPY |
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EM experiment | Aggregation state: PARTICLE / 3D reconstruction method: single particle reconstruction |
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Sample preparation
Component | Name: Seh1-associated complex (SEAC) / Type: COMPLEX / Entity ID: #1-#8 / Source: NATURAL |
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Molecular weight | Value: 2.09 MDa / Experimental value: NO |
Source (natural) | Organism: ![]() ![]() |
Buffer solution | pH: 7.4 |
Specimen | Embedding applied: NO / Shadowing applied: NO / Staining applied: NO / Vitrification applied: YES |
Specimen support | Grid material: GOLD / Grid mesh size: 300 divisions/in. / Grid type: Quantifoil R1.2/1.3 |
Vitrification | Instrument: LEICA EM GP / Cryogen name: ETHANE / Humidity: 90 % / Chamber temperature: 283 K |
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Electron microscopy imaging
Experimental equipment | ![]() Model: Titan Krios / Image courtesy: FEI Company |
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Microscopy | Model: FEI TITAN KRIOS |
Electron gun | Electron source: ![]() |
Electron lens | Mode: BRIGHT FIELD / Nominal defocus max: 1600 nm / Nominal defocus min: 600 nm / Cs: 2.7 mm |
Image recording | Electron dose: 40 e/Å2 / Film or detector model: FEI FALCON IV (4k x 4k) |
EM imaging optics | Energyfilter name: TFS Selectris X / Energyfilter slit width: 10 eV |
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Processing
EM software |
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CTF correction | Type: PHASE FLIPPING AND AMPLITUDE CORRECTION | ||||||||||||||||||||||||||||||||||||||||
Symmetry | Point symmetry: C2 (2 fold cyclic) | ||||||||||||||||||||||||||||||||||||||||
3D reconstruction | Resolution: 2.95 Å / Resolution method: FSC 0.143 CUT-OFF / Num. of particles: 208379 / Symmetry type: POINT | ||||||||||||||||||||||||||||||||||||||||
Atomic model building | Protocol: AB INITIO MODEL / Space: REAL Details: AlphaFold predictions were used as starting models for Sea1, Sea2, Sea3, Sea4, Npr2 and Npr3. Rigid body fit was performed in Chimera, and manual building in Coot. | ||||||||||||||||||||||||||||||||||||||||
Atomic model building | 3D fitting-ID: 1 / Pdb chain-ID: A / Source name: PDB / Type: experimental model
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