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Open data
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Basic information
Entry | Database: PDB / ID: 6xkk | ||||||
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Title | Cryo-EM structure of the NLRP1-CARD filament | ||||||
![]() | NACHT, LRR and PYD domains-containing protein 1 | ||||||
![]() | IMMUNE SYSTEM / Filament / inflammasome / signaling / UPA / CARD / FIIND / NLRP1 | ||||||
Function / homology | ![]() NLRP1 inflammasome complex assembly / NLRP1 inflammasome complex / cysteine-type endopeptidase activator activity / The NLRP1 inflammasome / NLRP3 inflammasome complex / self proteolysis / Hydrolases; Acting on peptide bonds (peptidases) / pattern recognition receptor signaling pathway / cellular response to UV-B / pattern recognition receptor activity ...NLRP1 inflammasome complex assembly / NLRP1 inflammasome complex / cysteine-type endopeptidase activator activity / The NLRP1 inflammasome / NLRP3 inflammasome complex / self proteolysis / Hydrolases; Acting on peptide bonds (peptidases) / pattern recognition receptor signaling pathway / cellular response to UV-B / pattern recognition receptor activity / pyroptotic inflammatory response / cysteine-type endopeptidase activator activity involved in apoptotic process / response to muramyl dipeptide / signaling adaptor activity / : / antiviral innate immune response / activation of innate immune response / intrinsic apoptotic signaling pathway / 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 / double-stranded DNA binding / regulation of inflammatory response / regulation of apoptotic process / neuron apoptotic process / defense response to virus / defense response to bacterium / inflammatory response / protein domain specific binding / apoptotic process / nucleolus / enzyme binding / signal transduction / ATP hydrolysis activity / nucleoplasm / ATP binding / nucleus / cytosol / cytoplasm Similarity search - Function | ||||||
Biological species | ![]() | ||||||
Method | ELECTRON MICROSCOPY / helical reconstruction / cryo EM / Resolution: 3.72 Å | ||||||
![]() | Hollingsworth, L.R. / David, L. / Li, Y. / Sharif, H. / Fontana, P. / Fu, T. / Wu, H. | ||||||
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![]() | ![]() 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. | ||||||
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PDBx/mmCIF format | ![]() | 676.7 KB | Display | ![]() |
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PDB format | ![]() | 527.4 KB | Display | ![]() |
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-Validation report
Summary document | ![]() | 1.3 MB | Display | ![]() |
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Full document | ![]() | 1.3 MB | Display | |
Data in XML | ![]() | 78.8 KB | Display | |
Data in CIF | ![]() | 129.5 KB | Display | |
Arichive directory | ![]() ![]() | HTTPS FTP |
-Related structure data
Related structure data | ![]() 22220MC ![]() 6xkjC ![]() 7keuC M: map data used to model this data C: citing same article ( |
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Similar structure data | |
EM raw data | ![]() Data #1: Unaligned multi-frame micrographs [micrographs - multiframe]) |
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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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