Structure of the DNA binding domain of antitoxin CopASO

Experimental Data Snapshot

  • Resolution: 3.00 Å
  • R-Value Free: 0.298 
  • R-Value Work: 0.247 
  • R-Value Observed: 0.249 

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Structure and allosteric coupling of type II antitoxin CopASO.

Zhao, R.Li, Q.Zhang, J.Li, F.Yao, J.Zhang, J.Liu, L.Wang, X.Zhang, X.

(2019) Biochem Biophys Res Commun 514: 1122-1127

  • DOI: https://doi.org/10.1016/j.bbrc.2019.05.049
  • Primary Citation of Related Structures:  

  • PubMed Abstract: 

    Toxin-antitoxin (TA) systems play critical roles in the environment adaptation of bacteria. Allosteric coupling between the N-terminal DNA-binding domain and the C-terminal toxin-binding domain of antitoxins contributes to conditional cooperativity in the functioning of type II TA. Herein, using circular dichroism (CD), nuclear magnetic resonance (NMR), X-ray crystallography, and size exclusion chromatography (SEC), the structure and DNA binding of CopA SO , a newly identified type II antitoxin in Shewanella oneidensis, were investigated. Our data show that CopA SO is a typical RHH antitoxin with an ordered N-terminal domain and a disordered C-terminal domain, and furthermore indicate that the C-terminal domain facilitates DNA binding of the N-terminal domain, which in turn induces the C-terminal domain to fold and associate.

  • Organizational Affiliation

    School of Life Sciences, University of Science and Technology of China, Hefei, Anhui, 230026, China.

Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
Transcriptional regulator CopG family
A, B, C, D, E
A, B, C, D, E, F
66Shewanella oneidensis MR-1Mutation(s): 0 
Gene Names: SO_1445
Find proteins for Q8EGZ2 (Shewanella oneidensis (strain MR-1))
Explore Q8EGZ2 
Go to UniProtKB:  Q8EGZ2
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupQ8EGZ2
Sequence Annotations
  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Resolution: 3.00 Å
  • R-Value Free: 0.298 
  • R-Value Work: 0.247 
  • R-Value Observed: 0.249 
  • Space Group: P 21 2 21
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 58.541α = 90
b = 60.949β = 90
c = 105.098γ = 90
Software Package:
Software NamePurpose
HKL-2000data reduction
HKL-2000data scaling
PDB_EXTRACTdata extraction

Structure Validation

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Entry History & Funding Information

Deposition Data

Funding OrganizationLocationGrant Number
National Natural Science Foundation of ChinaChina31470775

Revision History  (Full details and data files)

  • Version 1.0: 2019-01-16
    Type: Initial release
  • Version 1.1: 2019-08-07
    Changes: Data collection, Database references
  • Version 1.2: 2023-11-22
    Changes: Data collection, Database references, Refinement description