Crystal Structure of Human ASC-CARD

Experimental Data Snapshot

  • Resolution: 2.00 Å
  • R-Value Free: 0.252 
  • R-Value Work: 0.220 
  • R-Value Observed: 0.222 

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Homotypic CARD-CARD interaction is critical for the activation of NLRP1 inflammasome.

Xu, Z.Zhou, Y.Liu, M.Ma, H.Sun, L.Zahid, A.Chen, Y.Zhou, R.Cao, M.Wu, D.Zhao, W.Li, B.Jin, T.

(2021) Cell Death Dis 12: 57-57

  • DOI: https://doi.org/10.1038/s41419-020-03342-8
  • Primary Citation of Related Structures:  

  • PubMed Abstract: 

    Cytosolic inflammasomes are supramolecular complexes that are formed in response to intracellular pathogens and danger signals. However, as to date, the detailed description of a homotypic caspase recruitment domain (CARD) interaction between NLRP1 and ASC has not been presented. We found the CARD-CARD interaction between purified NLRP1 CARD and ASC CARD experimentally and the filamentous supramolecular complex formation in an in vitro proteins solution. Moreover, we determined a high-resolution crystal structure of the death domain fold of the human ASC CARD . Mutational and structural analysis revealed three conserved interfaces of the death domain superfamily (Type I, II, and III), which mediate the assembly of the NLRP1 CARD /ASC CARD complex. In addition, we validated the role of the three major interfaces of CARDs in assembly and activation of NLRP1 inflammasome in vitro. Our findings suggest a Mosaic model of homotypic CARD interactions for the activation of NLRP1 inflammasome. The Mosaic model provides insights into the mechanisms of inflammasome assembly and signal transduction amplification.

  • Organizational Affiliation

    CAS Center for Excellence in Molecular Cell Science, Chinese Academy of Science, Shanghai, 200031, China. jint@ustc.edu.cn.

Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
Maltose/maltodextrin-binding periplasmic protein,Apoptosis-associated speck-like protein containing a CARD
A, B
466Escherichia coli K-12Homo sapiens
This entity is chimeric
Mutation(s): 5 
Gene Names: malEb4034JW3994PYCARDASCCARD5TMS1
UniProt & NIH Common Fund Data Resources
Find proteins for P0AEX9 (Escherichia coli (strain K12))
Explore P0AEX9 
Go to UniProtKB:  P0AEX9
Find proteins for Q9ULZ3 (Homo sapiens)
Explore Q9ULZ3 
Go to UniProtKB:  Q9ULZ3
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupsP0AEX9Q9ULZ3
Sequence Annotations
  • Reference Sequence


Entity ID: 2
MoleculeChains Length2D Diagram Glycosylation3D Interactions
C, D
Glycosylation Resources
GlyTouCan:  G96370VA
GlyCosmos:  G96370VA
GlyGen:  G96370VA
Biologically Interesting Molecules (External Reference) 1 Unique
Experimental Data & Validation

Experimental Data

  • Resolution: 2.00 Å
  • R-Value Free: 0.252 
  • R-Value Work: 0.220 
  • R-Value Observed: 0.222 
  • Space Group: C 1 2 1
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 175.76α = 90
b = 56.02β = 106.58
c = 146.93γ = 90
Software Package:
Software NamePurpose
XDSdata reduction
XDSdata scaling

Structure Validation

View Full Validation Report

Entry History & Funding Information

Deposition Data

Funding OrganizationLocationGrant Number
National Natural Science Foundation of ChinaChina81872110
National Natural Science Foundation of ChinaChina81272881

Revision History  (Full details and data files)

  • Version 1.0: 2020-07-22
    Type: Initial release
  • Version 2.0: 2020-07-29
    Type: Remediation
    Reason: Carbohydrate remediation
    Changes: Advisory, Atomic model, Data collection, Derived calculations, Non-polymer description, Structure summary
  • Version 2.1: 2021-02-03
    Changes: Database references, Structure summary
  • Version 2.2: 2023-11-22
    Changes: Data collection, Database references, Refinement description