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- EMDB-2651: Cryo-EM structure of human APC/C-Cdh1-Hsl1 complex at 7.4 A resolution -

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Basic information

Database: EMDB / ID: EMD-2651
TitleCryo-EM structure of human APC/C-Cdh1-Hsl1 complex at 7.4 A resolution
Map data
SampleRecombinant human APC/C-Cdh1-Hsl1 ternary complex:
Anaphase-promoting complex
KeywordsCullin-RING E3 ligase / Ubiquitination
Biological speciesHomo sapiens (human)
Methodsingle particle reconstruction / cryo EM / Resolution: 7.4 Å
AuthorsChang LF / Zhang Z / Yang J / McLaughlin S / Barford D
CitationJournal: Nature / Year: 2014
Title: Molecular architecture and mechanism of the anaphase-promoting complex.
Authors: Lei-Fu Chang / Ziguo Zhang / Jing Yang / Stephen H McLaughlin / David Barford /
Abstract: The ubiquitination of cell cycle regulatory proteins by the anaphase-promoting complex/cyclosome (APC/C) controls sister chromatid segregation, cytokinesis and the establishment of the G1 phase of ...The ubiquitination of cell cycle regulatory proteins by the anaphase-promoting complex/cyclosome (APC/C) controls sister chromatid segregation, cytokinesis and the establishment of the G1 phase of the cell cycle. The APC/C is an unusually large multimeric cullin-RING ligase. Its activity is strictly dependent on regulatory coactivator subunits that promote APC/C-substrate interactions and stimulate its catalytic reaction. Because the structures of many APC/C subunits and their organization within the assembly are unknown, the molecular basis for these processes is poorly understood. Here, from a cryo-electron microscopy reconstruction of a human APC/C-coactivator-substrate complex at 7.4 Å resolution, we have determined the complete secondary structural architecture of the complex. With this information we identified protein folds for structurally uncharacterized subunits, and the definitive location of all 20 APC/C subunits within the 1.2 MDa assembly. Comparison with apo APC/C shows that the coactivator promotes a profound allosteric transition involving displacement of the cullin-RING catalytic subunits relative to the degron-recognition module of coactivator and APC10. This transition is accompanied by increased flexibility of the cullin-RING subunits and enhanced affinity for UBCH10-ubiquitin, changes which may contribute to coactivator-mediated stimulation of APC/C E3 ligase activity.
Validation ReportSummary, Full report, XML, About validation report
DepositionMay 17, 2014-
Header (metadata) releaseJun 18, 2014-
Map releaseJul 30, 2014-
UpdateSep 17, 2014-
Current statusSep 17, 2014Processing site: PDBe / Status: Released

Structure visualization

  • Surface view with section colored by density value
  • Surface level: 0.07
  • Imaged by UCSF Chimera
  • Download
  • Surface view colored by radius
  • Surface level: 0.07
  • Imaged by UCSF Chimera
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Movie viewer
Structure viewerEM map:
Supplemental images

Downloads & links


FileDownload / File: emd_2651.map.gz / Format: CCP4 / Size: 15.3 MB / Type: IMAGE STORED AS FLOATING POINT NUMBER (4 BYTES)
Projections & slices

Image control

AxesZ (Sec.)Y (Row.)X (Col.)
2.36 Å/pix.
x 160 pix.
= 377.6 Å
2.36 Å/pix.
x 160 pix.
= 377.6 Å
2.36 Å/pix.
x 160 pix.
= 377.6 Å



Slices (1/3)

Slices (1/2)

Slices (2/3)

Images are generated by Spider.

Voxel sizeX=Y=Z: 2.36 Å
Contour LevelBy EMDB: 0.124 / Movie #1: 0.07
Minimum - Maximum-0.30476442 - 0.49111506
Average (Standard dev.)0.00056381 (±0.02089142)
SymmetrySpace group: 1


Map geometry
Axis orderXYZ
CellA=B=C: 377.59998 Å
α=β=γ: 90.0 °

CCP4 map header:

modeImage stored as Reals
Å/pix. X/Y/Z2.362.362.36
M x/y/z160160160
origin x/y/z0.0000.0000.000
length x/y/z377.600377.600377.600
start NX/NY/NZ0-51-100
MAP C/R/S123
start NC/NR/NS-80-80-80
D min/max/mean-0.3050.4910.001

Supplemental data

Sample components

Entire Recombinant human APC/C-Cdh1-Hsl1 ternary complex

EntireName: Recombinant human APC/C-Cdh1-Hsl1 ternary complex / Details: The sample was monodisperse / Number of components: 16
MassTheoretical: 1.2 MDa / Experimental: 1.2 MDa

Component #1: protein, Anaphase-promoting complex

ProteinName: Anaphase-promoting complex / a.k.a: CyclosomeAnaphase-promoting complex / Recombinant expression: Yes
MassTheoretical: 1.2 MDa / Experimental: 1.2 MDa
SourceSpecies: Homo sapiens (human)

Experimental details

Sample preparation

SpecimenSpecimen state: Particle / Method: cryo EM
Sample solutionSpecimen conc.: 0.2 mg/mL
VitrificationInstrument: FEI VITROBOT MARK II / Cryogen name: ETHANE / Humidity: 100 %

Electron microscopy imaging

Experimental equipment
Model: Tecnai F20 / Image courtesy: FEI Company
ImagingMicroscope: FEI TECNAI F20 / Date: Dec 12, 2012
Electron gunElectron source: FIELD EMISSION GUN / Accelerating voltage: 200 kV / Electron dose: 25 e/Å2 / Illumination mode: OTHER
LensImaging mode: BRIGHT FIELD / Defocus: 1500 - 4000 nm
Specimen HolderHolder: Gatan 626 cryo-holder / Model: GATAN LIQUID NITROGEN
CameraDetector: TVIPS TEMCAM-F415 (4k x 4k)

Image processing

ProcessingMethod: single particle reconstruction / Applied symmetry: C1 (asymmetric) / Number of projections: 119386
3D reconstructionSoftware: Relion / Resolution: 7.4 Å / Resolution method: FSC 0.143, gold-standard

Atomic model buiding

Modeling #1Refinement protocol: flexible / Refinement space: REAL
Input PDB model: 1XPI

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