Hypothetical protein PA2703 Pseudomonas aeruginosa PAO1

Experimental Data Snapshot

  • Resolution: 2.28 Å
  • R-Value Free: 0.238 
  • R-Value Work: 0.208 
  • R-Value Observed: 0.209 

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Crystal structure of Pseudomonas aeruginosa Tsi2 reveals a stably folded superhelical antitoxin

Zou, T.T.Yao, X.Qin, B.Zhang, M.Cai, L.F.Shang, W.Svergun, D.I.Wang, M.T.Cui, S.Jin, Q.

(2012) J Mol Biol 417: 351-361

  • DOI: https://doi.org/10.1016/j.jmb.2012.01.040
  • Primary Citation of Related Structures:  

  • PubMed Abstract: 

    In the competition for niches in natural resources, Pseudomonas aeruginosa utilizes the type VI secretion system to inject the toxic protein effector Tse2 into bacteria on cell-cell contact. The cytoplasm toxin immunity protein Tsi2 can neutralize Tse2 by physical interaction with the toxin, providing essential protection from toxin activity. Except for orthologues in P. aeruginosa, Tsi2 antitoxin does not share detectable sequence homology with known proteins in public databases. The mechanism underlying toxin neutralization by Tsi2 remains unknown. We report here the crystal structure of Tsi2 at 2.28 Å resolution. Our structural and biophysical analyses demonstrate that the antitoxin adopts a previously unobserved superhelical conformation. Tsi2 is highly thermostable in the absence of the toxin in solution. Tsi2 assembles a dimer with 2-fold rotational symmetry, similar to that observed in other toxin-antitoxin systems. Dimerization is essential for the stable folding of Tsi2.

  • Organizational Affiliation

    Institute of Pathogen Biology, Chinese Academy of Medical Sciences and Peking Union Medical College, No. 9 Dong Dan San Tiao, Beijing 100730, PR China.

Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
Putative uncharacterized protein
A, B, C, D, E
A, B, C, D, E, F
102Pseudomonas aeruginosaMutation(s): 0 
Gene Names: PA2703
Find proteins for Q9I0D9 (Pseudomonas aeruginosa (strain ATCC 15692 / DSM 22644 / CIP 104116 / JCM 14847 / LMG 12228 / 1C / PRS 101 / PAO1))
Explore Q9I0D9 
Go to UniProtKB:  Q9I0D9
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupQ9I0D9
Sequence Annotations
  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Resolution: 2.28 Å
  • R-Value Free: 0.238 
  • R-Value Work: 0.208 
  • R-Value Observed: 0.209 
  • Space Group: I 21 21 21
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 91.897α = 90
b = 113.265β = 90
c = 143.467γ = 90
Software Package:
Software NamePurpose
RemDAqdata collection
XDSdata reduction
XDSdata scaling

Structure Validation

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Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 2012-02-08
    Type: Initial release
  • Version 1.1: 2013-06-19
    Changes: Database references