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- EMDB-41053: Local refinement map (2/3) of the human ULK1 complex core (EMD-40658) -

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Basic information

Entry
Database: EMDB / ID: EMD-41053
TitleLocal refinement map (2/3) of the human ULK1 complex core (EMD-40658)
Map dataThe local refinement map of the entry EMD-40658 (2/3)
Sample
  • Complex: Human autophagy initiation ULK1 complex core
KeywordsAutophagy / Protein kinase / Complex / IMMUNE SYSTEM
Biological speciesHomo sapiens (human)
Methodsingle particle reconstruction / cryo EM / Resolution: 3.35 Å
AuthorsChen M / Hurley JH
Funding support United States, 2 items
OrganizationGrant numberCountry
National Institutes of Health/National Institute of General Medical Sciences (NIH/NIGMS)GM111730 United States
Michael J. Fox FoundationASAP-000350 United States
Citation
Journal: Nat Struct Mol Biol / Year: 2025
Title: Structure and activation of the human autophagy-initiating ULK1C:PI3KC3-C1 supercomplex.
Authors: Minghao Chen / Thanh N Nguyen / Xuefeng Ren / Grace Khuu / Annan S I Cook / Yuanchang Zhao / Ahmet Yildiz / Michael Lazarou / James H Hurley /
Abstract: The Unc-51-like kinase protein kinase complex (ULK1C) is the most upstream and central player in the initiation of macroautophagy in mammals. Here, we determined the cryo-electron microscopy ...The Unc-51-like kinase protein kinase complex (ULK1C) is the most upstream and central player in the initiation of macroautophagy in mammals. Here, we determined the cryo-electron microscopy structure of the human ULK1C core at amino-acid-level resolution. We also determined a moderate-resolution structure of the ULK1C core in complex with another autophagy core complex, the class III phosphatidylinositol 3-OH kinase complex I (PI3KC3-C1). We show that the two complexes coassemble through extensive contacts between the FIP200 scaffold subunit of ULK1C and the VPS15, ATG14 and BECN1 subunits of PI3KC3-C1. The FIP200:ATG13:ULK1 core of ULK1C undergoes a rearrangement from 2:1:1 to 2:2:2 stoichiometry in the presence of PI3KC3-C1. This suggests a structural mechanism for the initiation of autophagy through formation of a ULK1C:PI3KC3-C1 supercomplex and dimerization of ULK1 on the FIP200 scaffold.
#1: Journal: bioRxiv / Year: 2023
Title: Structure and activation of the human autophagy-initiating ULK1C:PI3KC3-C1 supercomplex
Authors: Chen M / Ren X / Cook A / Hurley JH
History
DepositionJun 13, 2023-
Header (metadata) releaseJun 21, 2023-
Map releaseJun 21, 2023-
UpdateJun 18, 2025-
Current statusJun 18, 2025Processing site: RCSB / Status: Released

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Structure visualization

Supplemental images

emd_41053.png

Downloads & links

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Map

FileDownload / File: emd_41053.map.gz / Format: CCP4 / Size: 178 MB / Type: IMAGE STORED AS FLOATING POINT NUMBER (4 BYTES)
AnnotationThe local refinement map of the entry EMD-40658 (2/3)
Projections & slices

Image control

Size
Brightness
Contrast
Others
AxesZ (Sec.)Y (Row.)X (Col.)
1.05 Å/pix.
x 360 pix.
= 378. Å		1.05 Å/pix.
x 360 pix.
= 378. Å		1.05 Å/pix.
x 360 pix.
= 378. Å

Surface

Projections

Slices (1/3)

Slices (1/2)

Slices (2/3)

Images are generated by Spider.

Voxel sizeX=Y=Z: 1.05 Å
Density

Histogram

Histogram (log scale)
Contour LevelBy AUTHOR: 0.5
Minimum - Maximum-1.331933 - 2.4157946
Average (Standard dev.)-0.00028871046 (±0.022241397)
SymmetrySpace group: 1
Details

EMDB XML:

Map geometry
Axis orderXYZ
Origin000
Dimensions360360360
Spacing360360360
CellA=B=C: 377.99997 Å
α=β=γ: 90.0 °

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Supplemental data

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Half map: The according half map (1/2)

Fileemd_41053_half_map_1.map
AnnotationThe according half map (1/2)
Projections & Slices
AxesZYX

Projections

Slices (1/2)
Density Histograms

Histogram

Histogram (log scale)

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Half map: The according half map (2/2)

Fileemd_41053_half_map_2.map
AnnotationThe according half map (2/2)
Projections & Slices
AxesZYX

Projections

Slices (1/2)
Density Histograms

Histogram

Histogram (log scale)

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Sample components

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Entire : Human autophagy initiation ULK1 complex core

EntireName: Human autophagy initiation ULK1 complex core
Components
  • Complex: Human autophagy initiation ULK1 complex core

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Supramolecule #1: Human autophagy initiation ULK1 complex core

SupramoleculeName: Human autophagy initiation ULK1 complex core / type: complex / ID: 1 / Parent: 0 / Macromolecule list: #1-#3
Source (natural)Organism: Homo sapiens (human)
Molecular weightTheoretical: 188 KDa

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Experimental details

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Structure determination

Methodcryo EM
Processingsingle particle reconstruction
Aggregation stateparticle

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Sample preparation

Concentration0.2 mg/mL
BufferpH: 7.4
Component:
ConcentrationFormulaName
25.0 mMC8H18N2O4SHEPES
200.0 mMNaClsodium chloride
1.0 mMMgCl2magnesium chloride
GridModel: UltrAuFoil / Material: GOLD / Mesh: 300 / Support film - #0 - Film type ID: 1 / Support film - #0 - Material: GOLD / Support film - #0 - topology: HOLEY / Support film - #1 - Film type ID: 2 / Support film - #1 - Material: GRAPHENE / Support film - #1 - topology: CONTINUOUS / Details: 5 mA
VitrificationCryogen name: ETHANE / Chamber humidity: 100 % / Chamber temperature: 277 K / Instrument: FEI VITROBOT MARK IV

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Electron microscopy

MicroscopeFEI TITAN KRIOS
Image recordingFilm or detector model: GATAN K3 (6k x 4k) / Number grids imaged: 1 / Number real images: 8468 / Average electron dose: 50.0 e/Å2
Electron beamAcceleration voltage: 300 kV / Electron source: FIELD EMISSION GUN
Electron opticsC2 aperture diameter: 50.0 µm / Illumination mode: FLOOD BEAM / Imaging mode: BRIGHT FIELD / Cs: 2.7 mm / Nominal defocus max: 2.0 µm / Nominal defocus min: 0.8 µm / Nominal magnification: 81000
Sample stageSpecimen holder model: FEI TITAN KRIOS AUTOGRID HOLDER / Cooling holder cryogen: NITROGEN
Experimental equipment
Model: Titan Krios / Image courtesy: FEI Company

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Image processing

Particle selectionNumber selected: 2156516
CTF correctionSoftware - Name: cryoSPARC (ver. 3.3.1) / Type: PHASE FLIPPING AND AMPLITUDE CORRECTION
Startup modelType of model: INSILICO MODEL
Final reconstructionResolution.type: BY AUTHOR / Resolution: 3.35 Å / Resolution method: FSC 0.143 CUT-OFF / Software - Name: cryoSPARC (ver. 3.3.1) / Number images used: 267719
Initial angle assignmentType: MAXIMUM LIKELIHOOD / Software - Name: cryoSPARC (ver. 3.3.1)
Final angle assignmentType: MAXIMUM LIKELIHOOD / Software - Name: cryoSPARC (ver. 3.3.1)
Final 3D classificationNumber classes: 4 / Avg.num./class: 267719 / Software - Name: cryoSPARC (ver. 3.3.1)

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Atomic model buiding 1

Initial modelChain - Source name: AlphaFold / Chain - Initial model type: in silico model
RefinementSpace: REAL / Protocol: AB INITIO MODEL

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