8EVV

Apo form of DdlA from Pseudomonas aeruginosa PAO1


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.05 Å
  • R-Value Free: 0.252 
  • R-Value Work: 0.211 
  • R-Value Observed: 0.214 

Starting Model: experimental
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This is version 1.2 of the entry. See complete history


Literature

Comparative functional and structural analysis of Pseudomonas aeruginosa d-alanine-d-alanine ligase isoforms as prospective antibiotic targets.

Pederick, J.L.Woolman, J.C.Bruning, J.B.

(2023) FEBS J 290: 5536-5553

  • DOI: https://doi.org/10.1111/febs.16932
  • Primary Citation of Related Structures:  
    8EVV, 8EVW, 8EVX, 8EVY, 8EVZ

  • PubMed Abstract: 

    Pseudomonas aeruginosa is a major human pathogen in the healthcare setting. The emergence of multi-drug-resistant and extensive drug-resistant P. aeruginosa is of great concern, and clearly indicates that new alternatives to current first-line antibiotics are required in the future. Inhibition of d-alanine-d-alanine production presents as a promising avenue as it is a key component in the essential process of cell wall biosynthesis. In P. aeruginosa, d-alanine-d-alanine production is facilitated by two isoforms, d-alanine-d-alanine ligase A (PaDdlA) and d-alanine-d-alanine ligase B (PaDdlA), but neither enzyme has been individually characterised to date. Here, we present the functional and structural characterisation of PaDdlA and PaDdlB, and assess their potential as antibiotic targets. This was achieved using a combination of in vitro enzyme-activity assays and X-ray crystallography. The former revealed that both isoforms effectively catalyse d-alanine-d-alanine production with near identical efficiency, and that this is effectively disrupted by the model d-alanine-d-alanine ligase inhibitor, d-cycloserine. Next, each isoform was co-crystallised with ATP and either d-alanine-d-alanine or d-cycloserine, allowing direct comparison of the key structural features. Both isoforms possess the same structural architecture and share a high level of conservation within the active site. Although residues forming the d-alanine pocket are completely conserved, the ATP-binding pocket possesses several amino acid substitutions resulting in a differing chemical environment around the ATP adenine base. Together, these findings support that the discovery of dual PaDdlA/PaDdlB competitive inhibitors is a viable approach for developing new antibiotics against P. aeruginosa.


  • Organizational Affiliation

    Institute for Photonics and Advanced Sensing (IPAS), School of Biological Sciences, The University of Adelaide, SA, Australia.


Macromolecules
Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
D-alanine--D-alanine ligase A
A, B, C, D
347Pseudomonas aeruginosa PAO1Mutation(s): 0 
Gene Names: ddlAPA4201
EC: 6.3.2.4
UniProt
Find proteins for Q9HWI0 (Pseudomonas aeruginosa (strain ATCC 15692 / DSM 22644 / CIP 104116 / JCM 14847 / LMG 12228 / 1C / PRS 101 / PAO1))
Explore Q9HWI0 
Go to UniProtKB:  Q9HWI0
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupQ9HWI0
Sequence Annotations
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  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.05 Å
  • R-Value Free: 0.252 
  • R-Value Work: 0.211 
  • R-Value Observed: 0.214 
  • Space Group: P 21 21 21
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 71.372α = 90
b = 80.329β = 90
c = 271.978γ = 90
Software Package:
Software NamePurpose
PHENIXrefinement
XDSdata reduction
Aimlessdata scaling
PHASERphasing
PDB_EXTRACTdata extraction

Structure Validation

View Full Validation Report



Entry History & Funding Information

Deposition Data


Funding OrganizationLocationGrant Number
Not funded--

Revision History  (Full details and data files)

  • Version 1.0: 2023-08-30
    Type: Initial release
  • Version 1.1: 2023-09-06
    Changes: Database references
  • Version 1.2: 2023-12-20
    Changes: Database references