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- PDB-6n1h: Cryo-EM structure of ASC-CARD filament -

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Basic information

Entry
Database: PDB / ID: 6n1h
TitleCryo-EM structure of ASC-CARD filament
ComponentsApoptosis-associated speck-like protein containing a CARD
KeywordsSIGNALING PROTEIN / Inflammasome / filament / immunity
Function / homology
Function and homology information


NLRP6 inflammasome complex / myosin I binding / Pyrin domain binding / myeloid dendritic cell activation involved in immune response / positive regulation of antigen processing and presentation of peptide antigen via MHC class II / negative regulation of protein serine/threonine kinase activity / regulation of intrinsic apoptotic signaling pathway / myeloid dendritic cell activation / IkappaB kinase complex / The AIM2 inflammasome ...NLRP6 inflammasome complex / myosin I binding / Pyrin domain binding / myeloid dendritic cell activation involved in immune response / positive regulation of antigen processing and presentation of peptide antigen via MHC class II / negative regulation of protein serine/threonine kinase activity / regulation of intrinsic apoptotic signaling pathway / myeloid dendritic cell activation / IkappaB kinase complex / The AIM2 inflammasome / AIM2 inflammasome complex / icosanoid biosynthetic process / NLRP1 inflammasome complex / macropinocytosis / canonical inflammasome complex / interleukin-6 receptor binding / BMP receptor binding / NLRP3 inflammasome complex assembly / positive regulation of adaptive immune response / NLRP3 inflammasome complex / cysteine-type endopeptidase activator activity / CLEC7A/inflammasome pathway / negative regulation of interferon-beta production / osmosensory signaling pathway / regulation of tumor necrosis factor-mediated signaling pathway / positive regulation of extrinsic apoptotic signaling pathway / pattern recognition receptor signaling pathway / positive regulation of macrophage cytokine production / negative regulation of NF-kappaB transcription factor activity / pattern recognition receptor activity / tropomyosin binding / pyroptotic inflammatory response / positive regulation of actin filament polymerization / positive regulation of release of cytochrome c from mitochondria / positive regulation of activated T cell proliferation / intrinsic apoptotic signaling pathway by p53 class mediator / The NLRP3 inflammasome / positive regulation of interleukin-10 production / cellular response to interleukin-1 / intrinsic apoptotic signaling pathway in response to DNA damage by p53 class mediator / positive regulation of T cell migration / positive regulation of DNA-binding transcription factor activity / Purinergic signaling in leishmaniasis infection / positive regulation of chemokine production / positive regulation of defense response to virus by host / negative regulation of canonical NF-kappaB signal transduction / negative regulation of cytokine production involved in inflammatory response / intrinsic apoptotic signaling pathway / activation of innate immune response / positive regulation of phagocytosis / positive regulation of interleukin-1 beta production / tumor necrosis factor-mediated signaling pathway / positive regulation of interleukin-8 production / positive regulation of JNK cascade / apoptotic signaling pathway / positive regulation of non-canonical NF-kappaB signal transduction / positive regulation of NF-kappaB transcription factor activity / protein homooligomerization / positive regulation of T cell activation / regulation of protein stability / positive regulation of interleukin-6 production / positive regulation of type II interferon production / positive regulation of inflammatory response / positive regulation of tumor necrosis factor production / SARS-CoV-1 activates/modulates innate immune responses / cellular response to tumor necrosis factor / azurophil granule lumen / cellular response to lipopolysaccharide / regulation of inflammatory response / protease binding / secretory granule lumen / defense response to Gram-negative bacterium / defense response to virus / microtubule / transmembrane transporter binding / positive regulation of ERK1 and ERK2 cascade / positive regulation of canonical NF-kappaB signal transduction / protein dimerization activity / defense response to Gram-positive bacterium / regulation of autophagy / positive regulation of apoptotic process / inflammatory response / Golgi membrane / innate immune response / neuronal cell body / apoptotic process / Neutrophil degranulation / nucleolus / enzyme binding / endoplasmic reticulum / signal transduction / protein homodimerization activity / protein-containing complex / mitochondrion / extracellular region / nucleoplasm / identical protein binding / nucleus / cytoplasm / cytosol
Similarity search - Function
CARD8/ASC/NALP1, CARD domain / : / Death Domain, Fas / Death Domain, Fas / DAPIN domain / DAPIN domain profile. / PAAD/DAPIN/Pyrin domain / PAAD/DAPIN/Pyrin domain / CARD domain / CARD caspase recruitment domain profile. ...CARD8/ASC/NALP1, CARD domain / : / Death Domain, Fas / Death Domain, Fas / DAPIN domain / DAPIN domain profile. / PAAD/DAPIN/Pyrin domain / PAAD/DAPIN/Pyrin domain / CARD domain / CARD caspase recruitment domain profile. / Caspase recruitment domain / Death-like domain superfamily / Orthogonal Bundle / Mainly Alpha
Similarity search - Domain/homology
Apoptosis-associated speck-like protein containing a CARD
Similarity search - Component
Biological speciesHomo sapiens (human)
MethodELECTRON MICROSCOPY / helical reconstruction / cryo EM / Resolution: 3.17 Å
AuthorsLi, Y. / Fu, T. / Wu, H.
CitationJournal: Proc Natl Acad Sci U S A / Year: 2018
Title: Cryo-EM structures of ASC and NLRC4 CARD filaments reveal a unified mechanism of nucleation and activation of caspase-1.
Authors: Yang Li / Tian-Min Fu / Alvin Lu / Kristen Witt / Jianbin Ruan / Chen Shen / Hao Wu /
Abstract: Canonical inflammasomes are cytosolic supramolecular complexes that activate caspase-1 upon sensing extrinsic microbial invasions and intrinsic sterile stress signals. During inflammasome assembly, ...Canonical inflammasomes are cytosolic supramolecular complexes that activate caspase-1 upon sensing extrinsic microbial invasions and intrinsic sterile stress signals. During inflammasome assembly, adaptor proteins ASC and NLRC4 recruit caspase-1 through homotypic caspase recruitment domain (CARD) interactions, leading to caspase-1 dimerization and activation. Activated caspase-1 processes proinflammatory cytokines and Gasdermin D to induce cytokine maturation and pyroptotic cell death. Here, we present cryo-electron microscopy (cryo-EM) structures of NLRC4 CARD and ASC CARD filaments mediated by conserved three types of asymmetric interactions (types I, II, and III). We find that the CARDs of these two adaptor proteins share a similar assembly pattern, which matches that of the caspase-1 CARD filament whose structure we defined previously. These data indicate a unified mechanism for downstream caspase-1 recruitment through CARD-CARD interactions by both adaptors. Using structure modeling, we further show that full-length NLRC4 assembles via two separate symmetries at its CARD and its nucleotide-binding domain (NBD), respectively.
History
DepositionNov 8, 2018Deposition site: RCSB / Processing site: RCSB
SupersessionDec 5, 2018ID: 6DRN
Revision 1.0Dec 5, 2018Provider: repository / Type: Initial release
Revision 1.1Mar 13, 2024Group: Data collection / Database references / Category: chem_comp_atom / chem_comp_bond / database_2
Item: _database_2.pdbx_DOI / _database_2.pdbx_database_accession
Revision 1.2May 14, 2025Group: Data collection / Structure summary / Category: em_software / pdbx_entry_details / Item: _em_software.name

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Assembly

Deposited unit
A: Apoptosis-associated speck-like protein containing a CARD
B: Apoptosis-associated speck-like protein containing a CARD
C: Apoptosis-associated speck-like protein containing a CARD
D: Apoptosis-associated speck-like protein containing a CARD
E: Apoptosis-associated speck-like protein containing a CARD
F: Apoptosis-associated speck-like protein containing a CARD
G: Apoptosis-associated speck-like protein containing a CARD
H: Apoptosis-associated speck-like protein containing a CARD
I: Apoptosis-associated speck-like protein containing a CARD
J: Apoptosis-associated speck-like protein containing a CARD
K: Apoptosis-associated speck-like protein containing a CARD
L: Apoptosis-associated speck-like protein containing a CARD
M: Apoptosis-associated speck-like protein containing a CARD
N: Apoptosis-associated speck-like protein containing a CARD
O: Apoptosis-associated speck-like protein containing a CARD
P: Apoptosis-associated speck-like protein containing a CARD


Theoretical massNumber of molelcules
Total (without water)156,40216
Polymers156,40216
Non-polymers00
Water00
1


  • Idetical with deposited unit
  • defined by author
  • Evidence: microscopy
TypeNameSymmetry operationNumber
identity operation1_5551
Buried area27310 Å2
ΔGint-50 kcal/mol
Surface area52500 Å2
SymmetryHelical symmetry: (Circular symmetry: 1 / Dyad axis: no / N subunits divisor: 1 / Num. of operations: 16 / Rise per n subunits: 5 Å / Rotation per n subunits: -100.58 °)

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Components

#1: Protein
Apoptosis-associated speck-like protein containing a CARD / hASC / Caspase recruitment domain-containing protein 5 / PYD and CARD domain-containing protein / ...hASC / Caspase recruitment domain-containing protein 5 / PYD and CARD domain-containing protein / Target of methylation-induced silencing 1


Mass: 9775.143 Da / Num. of mol.: 16 / Fragment: CARD (UNP residues 112-194)
Source method: isolated from a genetically manipulated source
Source: (gene. exp.) Homo sapiens (human) / Gene: PYCARD, ASC, CARD5, TMS1 / Production host: Escherichia coli (E. coli) / References: UniProt: Q9ULZ3
Has protein modificationN

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Experimental details

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Experiment

ExperimentMethod: ELECTRON MICROSCOPY
EM experimentAggregation state: FILAMENT / 3D reconstruction method: helical reconstruction

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Sample preparation

ComponentName: ASC-CARD filament / Type: CELL / Entity ID: all / Source: RECOMBINANT
Source (natural)Organism: Homo sapiens (human)
Source (recombinant)Organism: Escherichia coli (E. coli)
Buffer solutionpH: 8
SpecimenEmbedding applied: NO / Shadowing applied: NO / Staining applied: NO / Vitrification applied: YES
Specimen supportDetails: unspecified
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
Image recordingElectron dose: 41 e/Å2 / Film or detector model: GATAN K2 SUMMIT (4k x 4k)

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Processing

SoftwareName: PHENIX / Version: 1.13_2998: / Classification: refinement
EM softwareName: PHENIX / Category: model refinement
CTF correctionType: PHASE FLIPPING AND AMPLITUDE CORRECTION
Helical symmertyAngular rotation/subunit: -100.58 ° / Axial rise/subunit: 5 Å / Axial symmetry: C1
3D reconstructionResolution: 3.17 Å / Resolution method: FSC 0.143 CUT-OFF / Num. of particles: 226603 / Symmetry type: HELICAL

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