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- EMDB-52295: Consensus map of human separase bound to SCC1 (310-550 aa) and SA2 -

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Basic information

Entry
Database: EMDB / ID: EMD-52295
TitleConsensus map of human separase bound to SCC1 (310-550 aa) and SA2
Map dataConsensus map (unsharpened) of human separase bound to SCC1 (310-550 aa) and SA2
Sample
  • Complex: Human separase bound to SCC1 (310-550 aa) and SA2
KeywordsSeparase / cell cycle / SCC1 / RAD21 / protease / chromosome segregation / Auto-cleavage / SA1/2 / cohesin
Biological speciesHomo sapiens (human)
Methodsingle particle reconstruction / cryo EM / Resolution: 3.4 Å
AuthorsYu J / Schmidt S / Botto M / Boland A
Funding support Switzerland, 2 items
OrganizationGrant numberCountry
Swiss National Science Foundation310030_185235 Switzerland
Swiss National Science FoundationTMSGI3_211581 Switzerland
CitationJournal: Sci Adv / Year: 2025
Title: Substrate recognition by human separase.
Authors: Jun Yu / Sophia Schmidt / Margherita Botto / Kitaik Lee / Chloe M Ghent / Jonah M Goodfried / Andrew Howe / Francis J O'Reilly / David O Morgan / Andreas Boland /
Abstract: The cohesin complex encircles sister chromatids in early mitosis. At anaphase onset, sister separation is triggered by the proteolytic cleavage of the cohesin subunit SCC1/RAD21 by separase. SCC1 ...The cohesin complex encircles sister chromatids in early mitosis. At anaphase onset, sister separation is triggered by the proteolytic cleavage of the cohesin subunit SCC1/RAD21 by separase. SCC1 contains two cleavage sites, where cleavage is stimulated by SCC1 phosphorylation. Substrate recognition and cleavage are only partly understood. Here, we determined structures of human separase in apo- or substrate-bound forms that, together with biochemical analysis, provide critical insights into separase cleavage regulation. We verify the first SCC1 cleavage site and reassign the second. We show that substrates, including separase autocleavage sites and the two SCC1 cleavage sites, interact with docking sites in separase, including five phosphate-binding sites. We also describe the interaction between the cohesin subunit SA1/SA2 and separase, which promotes cleavage at the second SCC1 site. Using cross-linking mass spectrometry and cryo-electron microscopy, we propose how cohesin is targeted by human separase. Our work provides an extensive functional and structural framework that explains a key event in cell division.
History
DepositionDec 9, 2024-
Header (metadata) releaseSep 3, 2025-
Map releaseSep 3, 2025-
UpdateMay 6, 2026-
Current statusMay 6, 2026Processing site: PDBe / Status: Released

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Structure visualization

Supplemental images

emd_52295.png

Downloads & links

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Map

FileDownload / File: emd_52295.map.gz / Format: CCP4 / Size: 512 MB / Type: IMAGE STORED AS FLOATING POINT NUMBER (4 BYTES)
AnnotationConsensus map (unsharpened) of human separase bound to SCC1 (310-550 aa) and SA2
Projections & slices

Image control

Size
Brightness
Contrast
Others
AxesZ (Sec.)Y (Row.)X (Col.)
0.9 Å/pix.
x 512 pix.
= 462.029 Å		0.9 Å/pix.
x 512 pix.
= 462.029 Å		0.9 Å/pix.
x 512 pix.
= 462.029 Å

Surface

Projections

Slices (1/3)

Slices (1/2)

Slices (2/3)

Images are generated by Spider.

Voxel sizeX=Y=Z: 0.9024 Å
Density

Histogram

Histogram (log scale)
Contour LevelBy AUTHOR: 0.13
Minimum - Maximum-0.37119895 - 0.585129
Average (Standard dev.)-0.00013124643 (±0.009251902)
SymmetrySpace group: 1
Details

EMDB XML:

Map geometry
Axis orderXYZ
Origin000
Dimensions512512512
Spacing512512512
CellA=B=C: 462.0288 Å
α=β=γ: 90.0 °

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Supplemental data

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Half map: Consensus half map A of human separase bound...

Fileemd_52295_half_map_1.map
AnnotationConsensus half map A of human separase bound to SCC1 (310-550 aa) and SA2
Projections & Slices
AxesZYX

Projections

Slices (1/2)
Density Histograms

Histogram

Histogram (log scale)

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Half map: Consensus half map B of human separase bound...

Fileemd_52295_half_map_2.map
AnnotationConsensus half map B of human separase bound to SCC1 (310-550 aa) and SA2
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 separase bound to SCC1 (310-550 aa) and SA2

EntireName: Human separase bound to SCC1 (310-550 aa) and SA2
Components
  • Complex: Human separase bound to SCC1 (310-550 aa) and SA2

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Supramolecule #1: Human separase bound to SCC1 (310-550 aa) and SA2

SupramoleculeName: Human separase bound to SCC1 (310-550 aa) and SA2 / type: complex / ID: 1 / Parent: 0 / Macromolecule list: #1-#2
Source (natural)Organism: Homo sapiens (human)
Molecular weightTheoretical: 400 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

Concentration0.1 mg/mL
BufferpH: 8
Component:
ConcentrationFormulaName
20.0 mMHepes2-[4-(2-hydroxyethyl)piperazin-1-yl]ethanesulfonic acid
150.0 mMKClPotassium chloride
0.5 mMTCEPtris(2-carboxyethyl)phosphine
GridModel: Quantifoil R1.2/1.3 / Material: GOLD / Mesh: 300 / Support film - Material: GRAPHENE OXIDE / Support film - topology: CONTINUOUS / Support film - Film thickness: 1
VitrificationCryogen name: ETHANE / Chamber humidity: 90 % / Chamber temperature: 277.15 K / Instrument: LEICA EM GP

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Electron microscopy

MicroscopeFEI TALOS ARCTICA
Specialist opticsEnergy filter - Name: TFS Selectris X / Energy filter - Slit width: 10 eV
Image recordingFilm or detector model: TFS FALCON 4i (4k x 4k) / Detector mode: COUNTING / Digitization - Dimensions - Width: 4096 pixel / Digitization - Dimensions - Height: 4096 pixel / Number grids imaged: 16 / Number real images: 57012 / Average electron dose: 50.0 e/Å2
Electron beamAcceleration voltage: 200 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: 0.6 µm / Nominal magnification: 130000
Sample stageSpecimen holder model: FEI TITAN KRIOS AUTOGRID HOLDER / Cooling holder cryogen: NITROGEN
Experimental equipment
Model: Talos Arctica / Image courtesy: FEI Company

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Image processing

Particle selectionNumber selected: 106898589 / Details: The particles were automatically selected
CTF correctionSoftware - Name: cryoSPARC (ver. 4.4.0) / Type: PHASE FLIPPING AND AMPLITUDE CORRECTION
Startup modelType of model: NONE
Final reconstructionNumber classes used: 1 / Algorithm: FOURIER SPACE / Resolution.type: BY AUTHOR / Resolution: 3.4 Å / Resolution method: FSC 0.143 CUT-OFF / Software - Name: cryoSPARC (ver. 4.4.0) / Software - details: Non-uniform refinement was used / Number images used: 177878
Initial angle assignmentType: MAXIMUM LIKELIHOOD / Software - Name: cryoSPARC (ver. 4.4.0)
Final angle assignmentType: MAXIMUM LIKELIHOOD / Software - Name: cryoSPARC (ver. 4.4.0)
Final 3D classificationNumber classes: 4 / Software - Name: cryoSPARC (ver. 4.4.0)

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Atomic model buiding 1

Initial model
PDB IDChain

7nj1

chain_id: A, source_name: PDB, initial_model_type: experimental model

4pju

chain_id: A, source_name: PDB, initial_model_type: experimental model
RefinementSpace: REAL / Protocol: RIGID BODY FIT

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