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- PDB-8jo0: The Cryo-EM structure of a heptameric CED-4/CED-3 catalytic complex -

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Basic information

Entry
Database: PDB / ID: 8jo0
TitleThe Cryo-EM structure of a heptameric CED-4/CED-3 catalytic complex
Components(Cell death protein 4) x 2
KeywordsAPOPTOSIS / CED-4 / CED-3 catalytic domain
Function / homology
Function and homology information


BH1 domain binding / positive regulation of apoptotic process involved in development / regulation of development, heterochronic / caspase complex / positive regulation of synapse pruning / peptidase activator activity involved in apoptotic process / positive regulation of protein processing / caspase binding / embryonic morphogenesis / apoptotic process involved in development ...BH1 domain binding / positive regulation of apoptotic process involved in development / regulation of development, heterochronic / caspase complex / positive regulation of synapse pruning / peptidase activator activity involved in apoptotic process / positive regulation of protein processing / caspase binding / embryonic morphogenesis / apoptotic process involved in development / negative regulation of execution phase of apoptosis / actin filament depolymerization / activation of cysteine-type endopeptidase activity / embryo development ending in birth or egg hatching / regulation of cell size / muscle cell cellular homeostasis / BH3 domain binding / cysteine-type endopeptidase activator activity involved in apoptotic process / endopeptidase activator activity / regulation of cell adhesion / regulation of protein stability / ADP binding / activation of cysteine-type endopeptidase activity involved in apoptotic process / defense response to Gram-negative bacterium / positive regulation of apoptotic process / apoptotic process / negative regulation of apoptotic process / perinuclear region of cytoplasm / magnesium ion binding / protein-containing complex / mitochondrion / ATP binding / identical protein binding / membrane / nucleus / cytosol
Similarity search - Function
Apoptosis regulator, Ced-4 / Caspase recruitment domain / NB-ARC / NB-ARC domain / CARD domain / CARD caspase recruitment domain profile. / Caspase recruitment domain / Death-like domain superfamily / Winged helix DNA-binding domain superfamily / Winged helix-like DNA-binding domain superfamily / P-loop containing nucleoside triphosphate hydrolase
Similarity search - Domain/homology
ADENOSINE-5'-TRIPHOSPHATE / Cell death protein 4
Similarity search - Component
Biological speciesCaenorhabditis elegans (invertebrata)
MethodELECTRON MICROSCOPY / single particle reconstruction / cryo EM / Resolution: 3.6 Å
AuthorsLi, Y. / Shi, Y.
Funding support China, 1items
OrganizationGrant numberCountry
Other private China
CitationJournal: Life Sci Alliance / Year: 2023
Title: Structural insights into CED-3 activation.
Authors: Yini Li / Lu Tian / Ying Zhang / Yigong Shi /
Abstract: In , onset of programmed cell death is marked with the activation of CED-3, a process that requires assembly of the CED-4 apoptosome. Activated CED-3 forms a holoenzyme with the CED-4 apoptosome to ...In , onset of programmed cell death is marked with the activation of CED-3, a process that requires assembly of the CED-4 apoptosome. Activated CED-3 forms a holoenzyme with the CED-4 apoptosome to cleave a wide range of substrates, leading to irreversible cell death. Despite decades of investigations, the underlying mechanism of CED-4-facilitated CED-3 activation remains elusive. Here, we report cryo-EM structures of the CED-4 apoptosome and three distinct CED-4/CED-3 complexes that mimic different activation stages for CED-3. In addition to the previously reported octamer in crystal structures, CED-4, alone or in complex with CED-3, exists in multiple oligomeric states. Supported by biochemical analyses, we show that the conserved CARD-CARD interaction promotes CED-3 activation, and initiation of programmed cell death is regulated by the dynamic organization of the CED-4 apoptosome.
History
DepositionJun 6, 2023Deposition site: PDBJ / Processing site: PDBJ
Revision 1.0Jun 28, 2023Provider: repository / Type: Initial release
Revision 1.1Aug 2, 2023Group: Database references / Category: citation / citation_author
Item: _citation.country / _citation.journal_abbrev ..._citation.country / _citation.journal_abbrev / _citation.journal_id_CSD / _citation.journal_id_ISSN / _citation.journal_volume / _citation.pdbx_database_id_DOI / _citation.pdbx_database_id_PubMed / _citation.title / _citation.year / _citation_author.identifier_ORCID
Revision 1.2Jul 3, 2024Group: Data collection / Category: chem_comp_atom / chem_comp_bond / em_admin / Item: _em_admin.last_update

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Structure visualization

Structure viewerMolecule:
MolmilJmol/JSmol

Downloads & links

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Assembly

Deposited unit
H: Cell death protein 4
I: Cell death protein 4
J: Cell death protein 4
K: Cell death protein 4
L: Cell death protein 4
M: Cell death protein 4
A: Cell death protein 4
B: Cell death protein 4
C: Cell death protein 4
D: Cell death protein 4
E: Cell death protein 4
F: Cell death protein 4
G: Cell death protein 4
hetero molecules


Theoretical massNumber of molelcules
Total (without water)521,99527
Polymers518,27513
Non-polymers3,72014
Water00
1


  • Idetical with deposited unit
  • defined by author
  • Evidence: electron microscopy, not applicable
TypeNameSymmetry operationNumber
identity operation1_5551

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Components

#1: Protein
Cell death protein 4


Mass: 12933.644 Da / Num. of mol.: 6
Source method: isolated from a genetically manipulated source
Source: (gene. exp.) Caenorhabditis elegans (invertebrata) / Gene: ced-4, C35D10.9 / Production host: Escherichia coli (E. coli) / References: UniProt: P30429
#2: Protein
Cell death protein 4


Mass: 62953.266 Da / Num. of mol.: 7
Source method: isolated from a genetically manipulated source
Source: (gene. exp.) Caenorhabditis elegans (invertebrata) / Gene: ced-4, C35D10.9 / Production host: Escherichia coli (E. coli) / References: UniProt: P30429
#3: Chemical
ChemComp-MG / MAGNESIUM ION


Mass: 24.305 Da / Num. of mol.: 7 / Source method: obtained synthetically / Formula: Mg / Feature type: SUBJECT OF INVESTIGATION
#4: Chemical
ChemComp-ATP / ADENOSINE-5'-TRIPHOSPHATE


Mass: 507.181 Da / Num. of mol.: 7 / Source method: obtained synthetically / Formula: C10H16N5O13P3 / Feature type: SUBJECT OF INVESTIGATION / Comment: ATP, energy-carrying molecule*YM
Has ligand of interestY

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Experimental details

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Experiment

ExperimentMethod: ELECTRON MICROSCOPY
EM experimentAggregation state: PARTICLE / 3D reconstruction method: single particle reconstruction

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Sample preparation

ComponentName: Heptameric CED-4/CED-3 catalytic complex / Type: COMPLEX / Entity ID: #2, #1 / Source: RECOMBINANT
Source (natural)Organism: Caenorhabditis elegans (invertebrata)
Source (recombinant)Organism: Escherichia coli (E. coli)
Buffer solutionpH: 7.5
SpecimenEmbedding applied: NO / Shadowing applied: NO / Staining applied: NO / Vitrification applied: YES
VitrificationCryogen name: ETHANE

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Electron microscopy imaging

Experimental equipment
Model: Titan Krios / Image courtesy: FEI Company
MicroscopyModel: FEI TITAN KRIOS
Electron gunElectron source: FIELD EMISSION GUN / Accelerating voltage: 300 kV / Illumination mode: FLOOD BEAM
Electron lensMode: BRIGHT FIELD / Nominal defocus max: 2000 nm / Nominal defocus min: 1500 nm
Image recordingElectron dose: 50 e/Å2 / Film or detector model: GATAN K2 SUMMIT (4k x 4k)

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Processing

CTF correctionType: PHASE FLIPPING AND AMPLITUDE CORRECTION
3D reconstructionResolution: 3.6 Å / Resolution method: FSC 0.143 CUT-OFF / Num. of particles: 67312 / Symmetry type: POINT

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