+Open data
-Basic information
Entry | Database: PDB / ID: 6xkk | ||||||
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Title | Cryo-EM structure of the NLRP1-CARD filament | ||||||
Components | NACHT, LRR and PYD domains-containing protein 1 | ||||||
Keywords | IMMUNE SYSTEM / Filament / inflammasome / signaling / UPA / CARD / FIIND / NLRP1 | ||||||
Function / homology | Function and homology information NLRP1 inflammasome complex assembly / cysteine-type endopeptidase activator activity / NLRP1 inflammasome complex / canonical inflammasome complex / The NLRP1 inflammasome / self proteolysis / Hydrolases; Acting on peptide bonds (peptidases) / pattern recognition receptor signaling pathway / pattern recognition receptor activity / cellular response to UV-B ...NLRP1 inflammasome complex assembly / cysteine-type endopeptidase activator activity / NLRP1 inflammasome complex / canonical inflammasome complex / The NLRP1 inflammasome / self proteolysis / Hydrolases; Acting on peptide bonds (peptidases) / pattern recognition receptor signaling pathway / pattern recognition receptor activity / cellular response to UV-B / pyroptotic inflammatory response / response to muramyl dipeptide / cysteine-type endopeptidase activator activity involved in apoptotic process / signaling adaptor activity / antiviral innate immune response / positive regulation of interleukin-1 beta production / molecular condensate scaffold activity / Hydrolases; Acting on acid anhydrides; Acting on acid anhydrides to facilitate cellular and subcellular movement / protein homooligomerization / : / positive regulation of inflammatory response / double-stranded RNA binding / peptidase activity / regulation of inflammatory response / double-stranded DNA binding / defense response to virus / regulation of apoptotic process / neuron apoptotic process / defense response to bacterium / protein domain specific binding / nucleolus / apoptotic process / enzyme binding / signal transduction / ATP hydrolysis activity / nucleoplasm / ATP binding / nucleus / cytosol / cytoplasm Similarity search - Function | ||||||
Biological species | Homo sapiens (human) | ||||||
Method | ELECTRON MICROSCOPY / helical reconstruction / cryo EM / Resolution: 3.72 Å | ||||||
Authors | Hollingsworth, L.R. / David, L. / Li, Y. / Sharif, H. / Fontana, P. / Fu, T. / Wu, H. | ||||||
Funding support | United States, 1items
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Citation | Journal: Nat Commun / Year: 2021 Title: Mechanism of filament formation in UPA-promoted CARD8 and NLRP1 inflammasomes. Authors: L Robert Hollingsworth / Liron David / Yang Li / Andrew R Griswold / Jianbin Ruan / Humayun Sharif / Pietro Fontana / Elizabeth L Orth-He / Tian-Min Fu / Daniel A Bachovchin / Hao Wu / Abstract: NLRP1 and CARD8 are related cytosolic sensors that upon activation form supramolecular signalling complexes known as canonical inflammasomes, resulting in caspase-1 activation, cytokine maturation ...NLRP1 and CARD8 are related cytosolic sensors that upon activation form supramolecular signalling complexes known as canonical inflammasomes, resulting in caspase-1 activation, cytokine maturation and/or pyroptotic cell death. NLRP1 and CARD8 use their C-terminal (CT) fragments containing a caspase recruitment domain (CARD) and the UPA (conserved in UNC5, PIDD, and ankyrins) subdomain for self-oligomerization, which in turn form the platform to recruit the inflammasome adaptor ASC (apoptosis-associated speck-like protein containing a CARD) or caspase-1, respectively. Here, we report cryo-EM structures of NLRP1-CT and CARD8-CT assemblies, in which the respective CARDs form central helical filaments that are promoted by oligomerized, but flexibly linked, UPAs surrounding the filaments. Through biochemical and cellular approaches, we demonstrate that the UPA itself reduces the threshold needed for NLRP1-CT and CARD8-CT filament formation and signalling. Structural analyses provide insights on the mode of ASC recruitment by NLRP1-CT and the contrasting direct recruitment of caspase-1 by CARD8-CT. We also discover that subunits in the central NLRP1 filament dimerize with additional exterior CARDs, which roughly doubles its thickness and is unique among all known CARD filaments. Finally, we engineer and determine the structure of an ASC-caspase-1 octamer, which suggests that ASC uses opposing surfaces for NLRP1, versus caspase-1, recruitment. Together these structures capture the architecture and specificity of the active NLRP1 and CARD8 inflammasomes in addition to key heteromeric CARD-CARD interactions governing inflammasome signalling. | ||||||
History |
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-Structure visualization
Movie |
Movie viewer |
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Structure viewer | Molecule: MolmilJmol/JSmol |
-Downloads & links
-Download
PDBx/mmCIF format | 6xkk.cif.gz | 676.7 KB | Display | PDBx/mmCIF format |
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PDB format | pdb6xkk.ent.gz | 527.4 KB | Display | PDB format |
PDBx/mmJSON format | 6xkk.json.gz | Tree view | PDBx/mmJSON format | |
Others | Other downloads |
-Validation report
Summary document | 6xkk_validation.pdf.gz | 1.3 MB | Display | wwPDB validaton report |
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Full document | 6xkk_full_validation.pdf.gz | 1.3 MB | Display | |
Data in XML | 6xkk_validation.xml.gz | 78.8 KB | Display | |
Data in CIF | 6xkk_validation.cif.gz | 129.5 KB | Display | |
Arichive directory | https://data.pdbj.org/pub/pdb/validation_reports/xk/6xkk ftp://data.pdbj.org/pub/pdb/validation_reports/xk/6xkk | HTTPS FTP |
-Related structure data
Related structure data | 22220MC 6xkjC 7keuC M: map data used to model this data C: citing same article (ref.) |
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Similar structure data | |
EM raw data | EMPIAR-10564 (Title: NLRP1-CT filament / Data size: 534.7 Data #1: Unaligned multi-frame micrographs [micrographs - multiframe]) |
-Links
-Assembly
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Symmetry | Helical symmetry: (Circular symmetry: 1 / Dyad axis: no / N subunits divisor: 1 / Num. of operations: 44 / Rise per n subunits: 5.1 Å / Rotation per n subunits: -100.8 °) | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
Noncrystallographic symmetry (NCS) | NCS domain:
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