5OE6

Crystal structure of the N-terminal domain of PqsA in complex with 6-fluoroanthraniloyl-AMP (crystal form 1)

Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.67 Å
  • R-Value Free: 0.313 
  • R-Value Work: 0.270 
  • R-Value Observed: 0.272 

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Literature

Structures of the N-Terminal Domain of PqsA in Complex with Anthraniloyl- and 6-Fluoroanthraniloyl-AMP: Substrate Activation in Pseudomonas Quinolone Signal (PQS) Biosynthesis.

Witzgall, F., Ewert, W., Blankenfeldt, W.

(2017) Chembiochem 18: 2045-2055

  • DOI: 10.1002/cbic.201700374
  • Primary Citation of Related Structures:  
    5OE3, 5OE4, 5OE5, 5OE6

  • PubMed Abstract: 

    • Pseudomonas aeruginosa, a prevalent pathogen in nosocomial infections and a major burden in cystic fibrosis, uses three interconnected quorum-sensing systems to coordinate virulence processes. At variance with other Gram-negative bacteria, one of these systems relies on 2-alkyl-4(1H)-quinolones (Pseudomonas quinolone signal, PQS) and might hence be an attractive target for new anti-infective agents ...

    Pseudomonas aeruginosa, a prevalent pathogen in nosocomial infections and a major burden in cystic fibrosis, uses three interconnected quorum-sensing systems to coordinate virulence processes. At variance with other Gram-negative bacteria, one of these systems relies on 2-alkyl-4(1H)-quinolones (Pseudomonas quinolone signal, PQS) and might hence be an attractive target for new anti-infective agents. Here we report crystal structures of the N-terminal domain of anthranilate-CoA ligase PqsA, the first enzyme of PQS biosynthesis, in complex with anthraniloyl-AMP and with 6-fluoroanthraniloyl-AMP (6FABA-AMP) at 1.4 and 1.7 Å resolution. We find that PqsA belongs to an unrecognized subfamily of anthranilate-CoA ligases that recognize the amino group of anthranilate through a water-mediated hydrogen bond. The complex with 6FABA-AMP explains why 6FABA, an inhibitor of PQS biosynthesis, is a good substrate of PqsA. Together, our data might pave a way to new pathoblockers in P. aeruginosa infections.

    Organizational Affiliation: 

    Institut für Biochemie, Biotechnologie und Bioinformatik, Technische Universität Braunschweig, Spielmannstrasse 7, 38106, Braunschweig, Germany.



Macromolecules
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(by identity cutoff)  |  Structure
Entity ID: 1
MoleculeChainsSequence LengthOrganismDetailsImage
Anthranilate--CoA ligaseA, B, C, D407Pseudomonas aeruginosa PAO1Mutation(s): 0 
Gene Names: pqsA, PA0996
EC: 6.2.1.32
UniProt
Find proteins for Q9I4X3 (Pseudomonas aeruginosa (strain ATCC 15692 / DSM 22644 / CIP 104116 / JCM 14847 / LMG 12228 / 1C / PRS 101 / PAO1))
Explore Q9I4X3 
Go to UniProtKB:  Q9I4X3
Protein Feature View
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  • Reference Sequence
Small Molecules
Ligands 2 Unique
IDChainsName / Formula / InChI Key2D Diagram3D Interactions
9SN (Subject of Investigation/LOI)
Query on 9SN
Download Ideal Coordinates CCD File 
E [auth A], F [auth B], G [auth C], I [auth D]6-fluoroanthraniloyl-AMP
C17 H18 F N6 O8 P
IWRUVECWXLGDCT-RVXWVPLUSA-N		 Ligand Interaction
PGE
Query on PGE
Download Ideal Coordinates CCD File 
H [auth C]TRIETHYLENE GLYCOL
C6 H14 O4
ZIBGPFATKBEMQZ-UHFFFAOYSA-N		 Ligand Interaction
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.67 Å
  • R-Value Free: 0.313 
  • R-Value Work: 0.270 
  • R-Value Observed: 0.272 
  • Space Group: P 1 21 1
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 71.558α = 90
b = 84.13β = 92.59
c = 138.212γ = 90
Software Package:
Software NamePurpose
Aimlessdata scaling
PHENIXrefinement
PDB_EXTRACTdata extraction
XDSdata reduction
Cootmodel building
PHASERphasing

Structure Validation

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Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 2017-09-06
    Type: Initial release
  • Version 1.1: 2017-10-25
    Changes: Database references