8GXJ

Pseudomonas aeruginosa N-acetyltransferase domain-containing protein PA3270


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.18 Å
  • R-Value Free: 0.254 
  • R-Value Work: 0.208 
  • R-Value Observed: 0.211 

Starting Model: experimental
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wwPDB Validation   3D Report Full Report


This is version 1.3 of the entry. See complete history


Literature

The novel type II toxin-antitoxin PacTA modulates Pseudomonas aeruginosa iron homeostasis by obstructing the DNA-binding activity of Fur.

Song, Y.Zhang, S.Ye, Z.Song, Y.Chen, L.Tong, A.He, Y.Bao, R.

(2022) Nucleic Acids Res 50: 10586-10600

  • DOI: https://doi.org/10.1093/nar/gkac867
  • Primary Citation of Related Structures:  
    8GXF, 8GXJ, 8GXK

  • PubMed Abstract: 

    Type II toxin-antitoxin (TA) systems are widely distributed in bacterial and archaeal genomes and are involved in diverse critical cellular functions such as defense against phages, biofilm formation, persistence, and virulence. GCN5-related N-acetyltransferase (GNAT) toxin, with an acetyltransferase activity-dependent mechanism of translation inhibition, represents a relatively new and expanding family of type II TA toxins. We here describe a group of GNAT-Xre TA modules widely distributed among Pseudomonas species. We investigated PacTA (one of its members encoded by PA3270/PA3269) from Pseudomonas aeruginosa and demonstrated that the PacT toxin positively regulates iron acquisition in P. aeruginosa. Notably, other than arresting translation through acetylating aminoacyl-tRNAs, PacT can directly bind to Fur, a key ferric uptake regulator, to attenuate its DNA-binding affinity and thus permit the expression of downstream iron-acquisition-related genes. We further showed that the expression of the pacTA locus is upregulated in response to iron starvation and the absence of PacT causes biofilm formation defect, thereby attenuating pathogenesis. Overall, these findings reveal a novel regulatory mechanism of GNAT toxin that controls iron-uptake-related genes and contributes to bacterial virulence.


  • Organizational Affiliation

    Center of Infectious Diseases, State Key Laboratory of Biotherapy, West China Hospital, Sichuan University, Chengdu 610093, China.


Macromolecules
Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
N-acetyltransferase domain-containing protein
A, B, C, D
195Pseudomonas aeruginosa PAO1Mutation(s): 0 
Gene Names: PA3270
UniProt
Find proteins for Q9HYX1 (Pseudomonas aeruginosa (strain ATCC 15692 / DSM 22644 / CIP 104116 / JCM 14847 / LMG 12228 / 1C / PRS 101 / PAO1))
Explore Q9HYX1 
Go to UniProtKB:  Q9HYX1
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupQ9HYX1
Sequence Annotations
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  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.18 Å
  • R-Value Free: 0.254 
  • R-Value Work: 0.208 
  • R-Value Observed: 0.211 
  • Space Group: P 41 21 2
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 100.25α = 90
b = 100.25β = 90
c = 147.66γ = 90
Software Package:
Software NamePurpose
PHENIXrefinement
HKL-2000data reduction
HKL-2000data scaling
PHENIXphasing

Structure Validation

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Entry History & Funding Information

Deposition Data


Funding OrganizationLocationGrant Number
National Natural Science Foundation of China (NSFC)China81871615

Revision History  (Full details and data files)

  • Version 1.0: 2022-10-12
    Type: Initial release
  • Version 1.1: 2022-10-19
    Changes: Database references
  • Version 1.2: 2022-11-02
    Changes: Database references
  • Version 1.3: 2023-11-08
    Changes: Data collection, Refinement description