- EMDB-36450: cryo-EM structure of a CED-4 hexamer -
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Entry
Database: EMDB / ID: EMD-36450
Title
cryo-EM structure of a CED-4 hexamer
Map data
Sample
Complex: CED-4 hexamer
Protein or peptide: Cell death protein 4
Ligand: MAGNESIUM ION
Ligand: ADENOSINE-5'-TRIPHOSPHATE
Keywords
CED-4 apoptosome / Hexamer / APOPTOSIS
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 / activation of cysteine-type endopeptidase activity involved in apoptotic process / ADP binding / defense response to Gram-negative bacterium / positive regulation of apoptotic process / negative regulation of apoptotic process / apoptotic process / perinuclear region of cytoplasm / magnesium ion binding / protein-containing complex / mitochondrion / ATP binding / identical protein binding / membrane / nucleus / cytosol Similarity search - Function
Journal: 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.
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