Crystal structure of CARD-only protein in frog virus 3

Experimental Data Snapshot

  • Resolution: 2.50 Å
  • R-Value Free: 0.236 
  • R-Value Work: 0.168 
  • R-Value Observed: 0.175 

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Structural transformation-mediated dimerization of caspase recruitment domain revealed by the crystal structure of CARD-only protein in frog virus 3.

Kim, C.M.Ha, H.J.Kwon, S.Jeong, J.H.Lee, S.H.Kim, Y.G.Lee, C.S.Lee, J.H.Park, H.H.

(2019) J Struct Biol 205: 189-195

  • DOI: https://doi.org/10.1016/j.jsb.2018.12.006
  • Primary Citation of Related Structures:  

  • PubMed Abstract: 

    Caspase recruitment domain (CARD)-only proteins (COPs), regulate apoptosis, inflammation, and innate immunity. They inhibit the assembly of NOD-like receptor complexes such as the inflammasome and NODosome, which are molecular complexes critical for caspase-1 activation. COPs are known to interact with either caspase-1 CARD or RIP2 CARD via a CARD-CARD interaction, and inhibit caspase-1 activation or further downstream signaling. In addition to the human COPs, Pseudo-ICE, INCA, and ICEBERG, several viruses also contain viral COPs that help them escape the host immune system. To elucidate the molecular mechanism of host immunity inhibition by viral COPs, we solved the structure of a viral COP for the first time. Our structure showed that viral COP forms a structural transformation-mediated dimer, which is unique and has not been reported in any structural study of a CARD domain. Based on the current structure, and the previously solved structures of other death domain superfamily members, we propose that structural transformation-mediated dimerization might be a new strategy for dimer assembly in the death domain superfamily.

  • Organizational Affiliation

    College of Pharmacy, Chung-Ang University, Seoul 06974, Republic of Korea.

Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
Caspase recruitment domain-only protein
A, B, C, D
104Frog virus 3Mutation(s): 0 
Gene Names: orf64RRUK13gorf64RSSMEgorf64R
Find proteins for W8SPG9 (Frog virus 3)
Explore W8SPG9 
Go to UniProtKB:  W8SPG9
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupW8SPG9
Sequence Annotations
  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Resolution: 2.50 Å
  • R-Value Free: 0.236 
  • R-Value Work: 0.168 
  • R-Value Observed: 0.175 
  • Space Group: P 1 21 1
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 46.657α = 90
b = 60.5β = 89.82
c = 78.836γ = 90
Software Package:
Software NamePurpose
HKL-2000data reduction
HKL-2000data scaling

Structure Validation

View Full Validation Report

Entry History & Funding Information

Deposition Data

Funding OrganizationLocationGrant Number
National Research Foundation (Korea)Korea, Republic Of--

Revision History  (Full details and data files)

  • Version 1.0: 2019-02-20
    Type: Initial release
  • Version 1.1: 2019-03-06
    Changes: Data collection, Database references
  • Version 1.2: 2023-11-22
    Changes: Data collection, Database references, Refinement description