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- EMDB-73045: GroEL Apoenzyme -

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Basic information

Entry
Database: EMDB / ID: EMD-73045
TitleGroEL Apoenzyme
Map data
Sample
  • Complex: GroEL Apoenzyme
    • Protein or peptide: Chaperonin GroEL
KeywordsChaperone / tetradecamer / nucleotide binding / apoenzyme
Function / homology
Function and homology information


GroEL-GroES complex / chaperonin ATPase / virion assembly / : / isomerase activity / ATP-dependent protein folding chaperone / response to radiation / unfolded protein binding / protein folding / response to heat ...GroEL-GroES complex / chaperonin ATPase / virion assembly / : / isomerase activity / ATP-dependent protein folding chaperone / response to radiation / unfolded protein binding / protein folding / response to heat / protein refolding / magnesium ion binding / ATP hydrolysis activity / ATP binding / identical protein binding / membrane / cytosol
Similarity search - Function
Chaperonin Cpn60, conserved site / Chaperonins cpn60 signature. / Chaperonin Cpn60/GroEL / GroEL-like equatorial domain superfamily / TCP-1-like chaperonin intermediate domain superfamily / GroEL-like apical domain superfamily / TCP-1/cpn60 chaperonin family / Chaperonin Cpn60/GroEL/TCP-1 family
Similarity search - Domain/homology
Biological speciesEscherichia coli (E. coli)
Methodsingle particle reconstruction / cryo EM / Resolution: 3.7 Å
AuthorsZafar H / Glass KC / Malone KL
Funding support United States, 4 items
OrganizationGrant numberCountry
National Institutes of Health/National Cancer Institute (NIH/NCI)P01 CA240685 United States
National Institutes of Health/National Cancer Institute (NIH/NCI)P20 GM113131-07S1 United States
National Institutes of Health/National Cancer Institute (NIH/NCI)R01 GM129338 United States
National Science Foundation (NSF, United States)2321501 United States
CitationJournal: bioRxiv / Year: 2025
Title: Breaking Barriers: Transitioning from X-ray Crystallography to Cryo-EM for Structural Studies of ATAD2B.
Authors: Hassan Zafar / Kiera L Malone / Ajit K Singh / Michael A Cianfrocco / Karen C Glass /
Abstract: Cryo-electron microscopy (cryo-EM) has transformed structural biology by enabling near-atomic resolution of large macromolecular complexes without the need for crystallization. Here, we describe our ...Cryo-electron microscopy (cryo-EM) has transformed structural biology by enabling near-atomic resolution of large macromolecular complexes without the need for crystallization. Here, we describe our laboratory's transition from X-ray crystallography to single-particle cryo-EM to investigate the ATPase family AAA+ domain-containing protein 2B (ATAD2B), a chromatin regulator implicated in epigenetic signaling. We outline the challenges encountered during protein expression, purification, and sample preparation, including co-purification of the chaperonin GroEL, and strategies employed to overcome these obstacles. Our workflow highlights critical steps in sample optimization, grid vitrification, and data processing using CryoSPARC, cisTEM, and Topaz, as well as computational requirements for high-resolution reconstructions. We also discuss model building, refinement, and validation approaches, emphasizing best practices for new cryo-EM users. This work provides practical insights for structural biologists adopting cryo-EM, particularly for large, flexible protein complexes, and underscores the importance of integrated approaches combining biochemical, computational, and imaging strategies.
History
DepositionOct 7, 2025-
Header (metadata) releaseDec 10, 2025-
Map releaseDec 10, 2025-
UpdateDec 10, 2025-
Current statusDec 10, 2025Processing site: RCSB / Status: Released

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Structure visualization

Supplemental images

emd_73045.png

Downloads & links

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Map

FileDownload / File: emd_73045.map.gz / Format: CCP4 / Size: 64 MB / Type: IMAGE STORED AS FLOATING POINT NUMBER (4 BYTES)
Projections & slices

Image control

Size
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AxesX (Sec.)Y (Row.)Z (Col.)
1.07 Å/pix.
x 256 pix.
= 273.664 Å		1.07 Å/pix.
x 256 pix.
= 273.664 Å		1.07 Å/pix.
x 256 pix.
= 273.664 Å

Surface

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Images are generated by Spider.

Voxel sizeX=Y=Z: 1.069 Å
Density

Histogram

Histogram (log scale)
Contour LevelBy AUTHOR: 3.2
Minimum - Maximum-6.8625336 - 15.710063999999999
Average (Standard dev.)0.000000000008415 (±1.0)
SymmetrySpace group: 1
Details

EMDB XML:

Map geometry
Axis orderZYX
Origin000
Dimensions256256256
Spacing256256256
CellA=B=C: 273.664 Å
α=β=γ: 90.0 °

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Supplemental data

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Additional map: #1

Fileemd_73045_additional_1.map
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Half map: #2

Fileemd_73045_half_map_1.map
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Half map: #1

Fileemd_73045_half_map_2.map
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Sample components

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Entire : GroEL Apoenzyme

EntireName: GroEL Apoenzyme
Components
  • Complex: GroEL Apoenzyme
    • Protein or peptide: Chaperonin GroEL

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Supramolecule #1: GroEL Apoenzyme

SupramoleculeName: GroEL Apoenzyme / type: complex / ID: 1 / Parent: 0 / Macromolecule list: all
Source (natural)Organism: Escherichia coli (E. coli)
Molecular weightTheoretical: 810 KDa

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Macromolecule #1: Chaperonin GroEL

MacromoleculeName: Chaperonin GroEL / type: protein_or_peptide / ID: 1 / Number of copies: 14 / Enantiomer: LEVO / EC number: chaperonin ATPase
Source (natural)Organism: Escherichia coli (E. coli)
Molecular weightTheoretical: 55.349285 KDa
Recombinant expressionOrganism: Escherichia coli 'BL21-Gold(DE3)pLysS AG' (bacteria)
SequenceString: AAKDVKFGND ARVKMLRGVN VLADAVKVTL GPKGRNVVLD KSFGAPTITK DGVSVAREIE LEDKFENMGA QMVKEVASKA NDAAGDGTT TATVLAQAII TEGLKAVAAG MNPMDLKRGI DKAVTAAVEE LKALSVPCSD SKAIAQVGTI SANSDETVGK L IAEAMDKV ...String:
AAKDVKFGND ARVKMLRGVN VLADAVKVTL GPKGRNVVLD KSFGAPTITK DGVSVAREIE LEDKFENMGA QMVKEVASKA NDAAGDGTT TATVLAQAII TEGLKAVAAG MNPMDLKRGI DKAVTAAVEE LKALSVPCSD SKAIAQVGTI SANSDETVGK L IAEAMDKV GKEGVITVED GTGLQDELDV VEGMQFDRGY LSPYFINKPE TGAVELESPF ILLADKKISN IREMLPVLEA VA KAGKPLL IIAEDVEGEA LATLVVNTMR GIVKVAAVKA PGFGDRRKAM LQDIATLTGG TVISEEIGME LEKATLEDLG QAK RVVINK DTTTIIDGVG EEAAIQGRVA QIRQQIEEAT SDYDREKLQE RVAKLAGGVA VIKVGAATEV EMKEKKARVE DALH ATRAA VEEGVVAGGG VALIRVASKL ADLRGQNEDQ NVGIKVALRA MEAPLRQIVL NCGEEPSVVA NTVKGGDGNY GYNAA TEEY GNMIDMGILD PTKVTRSALQ YAASVAGLMI TTECMVTDLP K

UniProtKB: Chaperonin GroEL

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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

BufferpH: 7.5
VitrificationCryogen name: ETHANE

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Electron microscopy

MicroscopeTFS KRIOS
Image recordingFilm or detector model: GATAN K3 BIOQUANTUM (6k x 4k) / Average electron dose: 52.5 e/Å2
Electron beamAcceleration voltage: 300 kV / Electron source: FIELD EMISSION GUN
Electron opticsIllumination mode: FLOOD BEAM / Imaging mode: BRIGHT FIELD / Cs: 2.7 mm / Nominal defocus max: 2.8000000000000003 µm / Nominal defocus min: 0.8 µm
Experimental equipment
Model: Titan Krios / Image courtesy: FEI Company

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Image processing

CTF correctionType: PHASE FLIPPING AND AMPLITUDE CORRECTION
Startup modelType of model: PDB ENTRY
PDB model - PDB ID:

9c0c


Details: 9C0C-GroEL apoenzyme
Final reconstructionResolution.type: BY AUTHOR / Resolution: 3.7 Å / Resolution method: FSC 0.143 CUT-OFF / Software - Name: cryoSPARC / Number images used: 42776
Initial angle assignmentType: MAXIMUM LIKELIHOOD
Final angle assignmentType: MAXIMUM LIKELIHOOD
Final 3D classificationSoftware - Name: cryoSPARC
FSC plot (resolution estimation)

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Atomic model buiding 1

Initial modelPDB ID:

9c0c


Chain - Source name: PDB / Chain - Initial model type: experimental model
RefinementSpace: REAL / Protocol: RIGID BODY FIT
Output model

PDB-9yke:
GroEL Apoenzyme

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