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- PDB-9v0j: Cryo-EM structure of GATOR1-KICSTOR complex -

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Basic information

Entry
Database: PDB / ID: 9v0j
TitleCryo-EM structure of GATOR1-KICSTOR complex
Components
  • GATOR1 complex protein DEPDC5
  • GATOR1 complex protein NPRL2
  • GATOR1 complex protein NPRL3
  • KICSTOR complex protein SZT2
KeywordsSIGNALING PROTEIN / GAP
Function / homology
Function and homology information


regulation of superoxide dismutase activity / KICSTOR complex / GATOR1 complex / negative regulation of kinase activity / corpus callosum morphogenesis / aorta morphogenesis / protein localization to lysosome / Amino acids regulate mTORC1 / cardiac muscle tissue development / vacuolar membrane ...regulation of superoxide dismutase activity / KICSTOR complex / GATOR1 complex / negative regulation of kinase activity / corpus callosum morphogenesis / aorta morphogenesis / protein localization to lysosome / Amino acids regulate mTORC1 / cardiac muscle tissue development / vacuolar membrane / ventricular septum development / pigmentation / roof of mouth development / cellular response to glucose starvation / negative regulation of TORC1 signaling / positive regulation of autophagy / GTPase activator activity / cellular response to amino acid starvation / central nervous system development / post-embryonic development / small GTPase binding / peroxisome / lysosome / intracellular signal transduction / lysosomal membrane / protein-containing complex binding / perinuclear region of cytoplasm / cytosol
Similarity search - Function
Protein SZT2 / : / IML1 N-terminal double psi beta barrel domain / Nitrogen permease regulator 3 / Nitrogen permease regulator 2 / Vacuolar membrane-associated protein Iml1 / DEPDC5 protein, C-terminal / : / : / Nitrogen Permease regulator of amino acid transport activity 3 ...Protein SZT2 / : / IML1 N-terminal double psi beta barrel domain / Nitrogen permease regulator 3 / Nitrogen permease regulator 2 / Vacuolar membrane-associated protein Iml1 / DEPDC5 protein, C-terminal / : / : / Nitrogen Permease regulator of amino acid transport activity 3 / Nitrogen permease regulator 2 / Vacuolar membrane-associated protein Iml1, N-terminal domain / DEPDC5 protein C-terminal region / GATOR1 complex protein NPRL3, C-terminal HTH / Domain found in Dishevelled, Egl-10, and Pleckstrin (DEP) / DEP domain profile. / Domain found in Dishevelled, Egl-10, and Pleckstrin / DEP domain / Winged helix DNA-binding domain superfamily / Winged helix-like DNA-binding domain superfamily
Similarity search - Domain/homology
GATOR1 complex protein DEPDC5 / GATOR1 complex protein NPRL3 / KICSTOR complex protein SZT2 / GATOR1 complex protein NPRL2
Similarity search - Component
Biological speciesHomo sapiens (human)
MethodELECTRON MICROSCOPY / single particle reconstruction / cryo EM / Resolution: 2.97 Å
AuthorsSu, M.-Y.
Funding support China, 1items
OrganizationGrant numberCountry
Other government20231120103446003 China
CitationJournal: Nat Struct Mol Biol / Year: 2025
Title: Architecture of the human KICSTOR and GATOR1-KICSTOR complexes.
Authors: Fei Teng / Huan Zeng / Xinyi Mai / Shujun Chen / Lulu Wang / Zeming Feng / Shuyun Tian / Shan Wang / Goran Stjepanovic / Chun-Yan Lim / Ming-Yuan Su /
Abstract: The human KICSTOR complex, comprising KPTN, ITFG2, C12orf66 and the scaffolding protein SZT2, anchors the mTORC1 inhibitor GATOR1 to lysosomes. Mutations affecting KICSTOR subunits are associated ...The human KICSTOR complex, comprising KPTN, ITFG2, C12orf66 and the scaffolding protein SZT2, anchors the mTORC1 inhibitor GATOR1 to lysosomes. Mutations affecting KICSTOR subunits are associated with severe neurodevelopmental and epileptic disorders. Loss of KICSTOR mimics GATOR1 inactivation, resulting in constitutive mTORC1 activation, highlighting its critical role in nutrient sensing. Here, we used cryo-electron microscopy and computational modeling to determine the architectures of KICSTOR and the GATOR1-KICSTOR supercomplex. We show that SZT2 forms a crescent-shaped scaffold with repetitive tandem units, binding the ITFG2-KPTN heterodimer and C12orf66 at its C terminus. Structural and biochemical analyses revealed that GATOR1 binds the SZT2 N-terminal domain through NPRL3; disruption of this interaction hyperactivates mTORC1 and mislocalizes TFE3 independently of nutrient status. We further demonstrate the membrane-binding ability of KICSTOR, with SZT2 and C12orf66 preferentially interacting with negatively charged lipids-a requirement for lysosomal localization. These findings identify how KICSTOR positions GATOR1 on lysosomes to regulate nutrient-dependent mTORC1 signaling.
History
DepositionMay 18, 2025Deposition site: PDBJ / Processing site: PDBC
Revision 1.0Nov 12, 2025Provider: repository / Type: Initial release
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Structure visualization

Structure viewerMolecule:
MolmilJmol/JSmol

Downloads & links

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Assembly

Deposited unit
A: GATOR1 complex protein NPRL2
B: GATOR1 complex protein NPRL3
C: GATOR1 complex protein DEPDC5
D: KICSTOR complex protein SZT2


Theoretical massNumber of molelcules
Total (without water)667,3244
Polymers667,3244
Non-polymers00
Water00
1


  • Idetical with deposited unit
  • defined by author
  • Evidence: electron microscopy, not applicable
TypeNameSymmetry operationNumber
identity operation1_5551

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Components

#1: Protein GATOR1 complex protein NPRL2 / Gene 21 protein / G21 protein / Nitrogen permease regulator 2-like protein / NPR2-like protein / ...Gene 21 protein / G21 protein / Nitrogen permease regulator 2-like protein / NPR2-like protein / Tumor suppressor candidate 4


Mass: 43711.395 Da / Num. of mol.: 1
Source method: isolated from a genetically manipulated source
Source: (gene. exp.) Homo sapiens (human) / Gene: NPRL2, TUSC4 / Production host: Homo sapiens (human) / References: UniProt: Q8WTW4
#2: Protein GATOR1 complex protein NPRL3 / -14 gene protein / Alpha-globin regulatory element-containing gene protein / Nitrogen permease ...-14 gene protein / Alpha-globin regulatory element-containing gene protein / Nitrogen permease regulator 3-like protein / Protein CGTHBA


Mass: 63680.820 Da / Num. of mol.: 1
Source method: isolated from a genetically manipulated source
Source: (gene. exp.) Homo sapiens (human) / Gene: NPRL3, C16orf35, CGTHBA, MARE / Production host: Homo sapiens (human) / References: UniProt: Q12980
#3: Protein GATOR1 complex protein DEPDC5 / DEP domain-containing protein 5


Mass: 181478.000 Da / Num. of mol.: 1
Source method: isolated from a genetically manipulated source
Source: (gene. exp.) Homo sapiens (human) / Gene: DEPDC5, KIAA0645 / Production host: Homo sapiens (human) / References: UniProt: O75140
#4: Protein KICSTOR complex protein SZT2 / Seizure threshold 2 protein homolog


Mass: 378453.438 Da / Num. of mol.: 1
Source method: isolated from a genetically manipulated source
Source: (gene. exp.) Homo sapiens (human) / Gene: SZT2, C1orf84, KIAA0467 / Production host: Homo sapiens (human) / References: UniProt: Q5T011
Has protein modificationN

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Experimental details

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Experiment

ExperimentMethod: ELECTRON MICROSCOPY
EM experimentAggregation state: PARTICLE / 3D reconstruction method: single particle reconstruction

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Sample preparation

ComponentName: Complex of GATOR1 bound to KICSTOR / Type: COMPLEX / Entity ID: all / Source: RECOMBINANT
Molecular weightValue: 0.815 MDa / Experimental value: NO
Source (natural)Organism: Homo sapiens (human)
Source (recombinant)Organism: Homo sapiens (human)
Buffer solutionpH: 7.4
SpecimenEmbedding applied: NO / Shadowing applied: NO / Staining applied: NO / Vitrification applied: YES
VitrificationCryogen name: ETHANE

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Electron microscopy imaging

Experimental equipment
Model: Titan Krios / Image courtesy: FEI Company
MicroscopyModel: TFS KRIOS
Electron gunElectron source: FIELD EMISSION GUN / Accelerating voltage: 300 kV / Illumination mode: OTHER
Electron lensMode: BRIGHT FIELD / Nominal defocus max: 1800 nm / Nominal defocus min: 1200 nm
Image recordingElectron dose: 50.1 e/Å2 / Film or detector model: GATAN K3 (6k x 4k)

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Processing

EM softwareName: PHENIX / Category: model refinement
CTF correctionType: NONE
3D reconstructionResolution: 2.97 Å / Resolution method: FSC 0.143 CUT-OFF / Num. of particles: 491656 / Symmetry type: POINT
RefinementStereochemistry target values: REAL-SPACE (WEIGHTED MAP SUM AT ATOM CENTERS)
Refine LS restraints
Refine-IDTypeDev idealNumber
ELECTRON MICROSCOPYf_bond_d0.00415093
ELECTRON MICROSCOPYf_angle_d0.62820643
ELECTRON MICROSCOPYf_dihedral_angle_d6.5862182
ELECTRON MICROSCOPYf_chiral_restr0.0432464
ELECTRON MICROSCOPYf_plane_restr0.0052611

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