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- EMDB-39725: Cryo-EM structure of CUL3-RBX1-KLHL22 complex --C1 Symmetry -

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Basic information

Entry
Database: EMDB / ID: EMD-39725
TitleCryo-EM structure of CUL3-RBX1-KLHL22 complex --C1 Symmetry
Map dataRepresentative class map of CUL3 N-terminal aa 1-13
Sample
  • Complex: CUL3-RBX1-KLHL22 complex without CUL3 NA motif
KeywordsCullin Ring E3 ubiquitin ligase / LIGASE
Biological speciesHomo sapiens (human)
Methodsingle particle reconstruction / cryo EM / Resolution: 3.7 Å
AuthorsWang W / Ling L / Dai Z / Zuo P / Yin Y
Funding support China, 4 items
OrganizationGrant numberCountry
National Natural Science Foundation of China (NSFC)2021YFA1300601 China
National Natural Science Foundation of China (NSFC)82030081 China
National Natural Science Foundation of China (NSFC)81874235 China
National Natural Science Foundation of China (NSFC)31800626 China
CitationJournal: Nat Commun / Year: 2024
Title: A conserved N-terminal motif of CUL3 contributes to assembly and E3 ligase activity of CRL3.
Authors: Weize Wang / Ling Liang / Zonglin Dai / Peng Zuo / Shang Yu / Yishuo Lu / Dian Ding / Hongyi Chen / Hui Shan / Yan Jin / Youdong Mao / Yuxin Yin /
Abstract: The CUL3-RING E3 ubiquitin ligases (CRL3s) play an essential role in response to extracellular nutrition and stress stimuli. The ubiquitin ligase function of CRL3s is activated through dimerization. ...The CUL3-RING E3 ubiquitin ligases (CRL3s) play an essential role in response to extracellular nutrition and stress stimuli. The ubiquitin ligase function of CRL3s is activated through dimerization. However, how and why such a dimeric assembly is required for its ligase activity remains elusive. Here, we report the cryo-EM structure of the dimeric CRL3 complex and reveal a conserved N-terminal motif in CUL3 that contributes to the dimerization assembly and the E3 ligase activity of CRL3. We show that deletion of the CUL3 N-terminal motif impairs dimeric assembly and the E3 ligase activity of both CRL3 and several other CRL3s. In addition, we found that the dynamics of dimeric assembly of CRL3 generates a variable ubiquitination zone, potentially facilitating substrate recognition and ubiquitination. These findings demonstrate that a CUL3 N-terminal motif participates in the assembly process and provide insights into the assembly and activation of CRL3s.
History
DepositionApr 11, 2024-
Header (metadata) releaseMay 22, 2024-
Map releaseMay 22, 2024-
UpdateMay 22, 2024-
Current statusMay 22, 2024Processing site: PDBj / Status: Released

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Structure visualization

Supplemental images

emd_39725.png

Downloads & links

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Map

FileDownload / File: emd_39725.map.gz / Format: CCP4 / Size: 512 MB / Type: IMAGE STORED AS FLOATING POINT NUMBER (4 BYTES)
AnnotationRepresentative class map of CUL3 N-terminal aa 1-13
Voxel sizeX=Y=Z: 0.821 Å
Density
Contour LevelBy AUTHOR: 0.06
Minimum - Maximum-0.1524292 - 0.4278941
Average (Standard dev.)-0.0005072518 (±0.008217082)
SymmetrySpace group: 1
Details

EMDB XML:

Map geometry
Axis orderXYZ
Origin000
Dimensions512512512
Spacing512512512
CellA=B=C: 420.352 Å
α=β=γ: 90.0 °

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Supplemental data

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Mask #1

Fileemd_39725_msk_1.map
Projections & Slices
AxesZYX

Projections

Slices (1/2)
Density Histograms

Histogram

Histogram (log scale)

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Half map: half map A

Fileemd_39725_half_map_1.map
Annotationhalf map A
Projections & Slices
AxesZYX

Projections

Slices (1/2)
Density Histograms

Histogram

Histogram (log scale)

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Half map: half map B

Fileemd_39725_half_map_2.map
Annotationhalf map B
Projections & Slices
AxesZYX

Projections

Slices (1/2)
Density Histograms

Histogram

Histogram (log scale)

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Sample components

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Entire : CUL3-RBX1-KLHL22 complex without CUL3 NA motif

EntireName: CUL3-RBX1-KLHL22 complex without CUL3 NA motif
Components
  • Complex: CUL3-RBX1-KLHL22 complex without CUL3 NA motif

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Supramolecule #1: CUL3-RBX1-KLHL22 complex without CUL3 NA motif

SupramoleculeName: CUL3-RBX1-KLHL22 complex without CUL3 NA motif / type: complex / ID: 1 / Parent: 0 / Macromolecule list: #1-#2
Source (natural)Organism: Homo sapiens (human)

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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

Concentration2.00 mg/mL
BufferpH: 7.5
Component:
ConcentrationFormulaName
150.0 mMNaClSodium chloridesodium chloride
20.0 mMTristris(hydroxymethyl)aminomethane
1.0 mMTCEP2-Amino-2-(hydroxymethyl)propane-1,3-diol
GridModel: Quantifoil R1.2/1.3 / Support film - Material: CARBON / Support film - topology: CONTINUOUS
VitrificationCryogen name: ETHANE / Chamber humidity: 100 % / Chamber temperature: 277 K / Instrument: FEI VITROBOT MARK IV

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Electron microscopy

MicroscopeFEI TITAN KRIOS
Electron beamAcceleration voltage: 300 kV / Electron source: FIELD EMISSION GUN
Electron opticsIllumination mode: FLOOD BEAM / Imaging mode: DIFFRACTION / Nominal defocus max: 2.0 µm / Nominal defocus min: 1.5 µm
Image recordingFilm or detector model: GATAN K2 SUMMIT (4k x 4k) / Detector mode: SUPER-RESOLUTION / Average electron dose: 50.0 e/Å2
Experimental equipment
Model: Titan Krios / Image courtesy: FEI Company

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Image processing

Startup modelType of model: NONE
Initial angle assignmentType: ANGULAR RECONSTITUTION / Software - Name: cryoSPARC (ver. 4.2)
Final 3D classificationSoftware - Name: cryoSPARC (ver. 4.2)
Final angle assignmentType: ANGULAR RECONSTITUTION / Software - Name: cryoSPARC (ver. 4.2)
Final reconstructionApplied symmetry - Point group: C1 (asymmetric) / Resolution.type: BY AUTHOR / Resolution: 3.7 Å / Resolution method: FSC 0.143 CUT-OFF / Software - Name: cryoSPARC (ver. 4.2) / Number images used: 142803
FSC plot (resolution estimation)

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