Crystal structure of ThsB

Experimental Data Snapshot

  • Resolution: 1.80 Å
  • R-Value Free: 0.226 
  • R-Value Work: 0.191 
  • R-Value Observed: 0.193 

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Structural and functional evidence of bacterial antiphage protection by Thoeris defense system via NAD+degradation.

Ka, D.Oh, H.Park, E.Kim, J.H.Bae, E.

(2020) Nat Commun 11: 2816-2816

  • DOI: https://doi.org/10.1038/s41467-020-16703-w
  • Primary Citation of Related Structures:  
    6LHX, 6LHY

  • PubMed Abstract: 

    The intense arms race between bacteria and phages has led to the development of diverse antiphage defense systems in bacteria. Unlike well-known restriction-modification and CRISPR-Cas systems, recently discovered systems are poorly characterized. One such system is the Thoeris defense system, which consists of two genes, thsA and thsB. Here, we report structural and functional analyses of ThsA and ThsB. ThsA exhibits robust NAD + cleavage activity and a two-domain architecture containing sirtuin-like and SLOG-like domains. Mutation analysis suggests that NAD + cleavage is linked to the antiphage function of Thoeris. ThsB exhibits a structural resemblance to TIR domain proteins such as nucleotide hydrolases and Toll-like receptors, but no enzymatic activity is detected in our in vitro assays. These results further our understanding of the molecular mechanism underlying the Thoeris defense system, highlighting a unique strategy for bacterial antiphage resistance via NAD + degradation.

  • Organizational Affiliation

    Department of Agricultural Biotechnology, Seoul National University, Seoul, 08826, Korea.

Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
DUF1863 domain-containing protein
A, B
194Bacillus cereus MSX-D12Mutation(s): 0 
Gene Names: II9_05449
Find proteins for J8G8J6 (Bacillus cereus (strain MSX-D12))
Explore J8G8J6 
Go to UniProtKB:  J8G8J6
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupJ8G8J6
Sequence Annotations
  • Reference Sequence
Small Molecules
Modified Residues  1 Unique
IDChains TypeFormula2D DiagramParent
Query on MSE
A, B
Experimental Data & Validation

Experimental Data

  • Resolution: 1.80 Å
  • R-Value Free: 0.226 
  • R-Value Work: 0.191 
  • R-Value Observed: 0.193 
  • Space Group: P 1 21 1
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 53.57α = 90
b = 67.731β = 92.38
c = 59.169γ = 90
Software Package:
Software NamePurpose
HKL-2000data collection
HKL-2000data scaling
PDB_EXTRACTdata extraction
PHENIXmodel building
HKL-2000data reduction

Structure Validation

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Entry History & Funding Information

Deposition Data

Funding OrganizationLocationGrant Number
National Research Foundation (Korea)Korea, Republic Of2019R1A2C1086298

Revision History  (Full details and data files)

  • Version 1.0: 2020-06-24
    Type: Initial release