4P73 image
Entry Detail
PDB ID:
4P73
Title:
PheRS in complex with compound 1a
Biological Source:
Source Organism:
Host Organism:
PDB Version:
Deposition Date:
2014-03-25
Release Date:
2014-06-25
Method Details:
Experimental Method:
Resolution:
3.03 Å
R-Value Free:
0.21
R-Value Work:
0.17
R-Value Observed:
0.17
Space Group:
C 1 2 1
Macromolecular Entities
Polymer Type:polypeptide(L)
Description:Phenylalanine--tRNA ligase beta subunit
Chain IDs:A, B
Chain Length:792
Number of Molecules:2
Biological Source:Pseudomonas aeruginosa
Polymer Type:polypeptide(L)
Description:Phenylalanine--tRNA ligase alpha subunit
Chain IDs:C, D
Chain Length:338
Number of Molecules:2
Biological Source:Pseudomonas aeruginosa
Ligand Molecules
Primary Citation
The role of a novel auxiliary pocket in bacterial phenylalanyl-tRNA synthetase druggability.
J.Biol.Chem. 289 21651 21662 (2014)
PMID: 24936059 DOI: 10.1074/jbc.M114.574061

Abstact

The antimicrobial activity of phenyl-thiazolylurea-sulfonamides against Staphylococcus aureus PheRS are dependent upon phenylalanine levels in the extracellular fluids. Inhibitor efficacy in animal models of infection is substantially diminished by dietary phenylalanine intake, thereby reducing the perceived clinical utility of this inhibitor class. The search for novel antibacterial compounds against Gram-negative pathogens led to a re-evaluation of this phenomenon, which is shown here to be unique to S. aureus. Inhibition of macromolecular syntheses and characterization of novel resistance mutations in Escherichia coli demonstrate that antimicrobial activity of phenyl-thiazolylurea-sulfonamides is mediated by PheRS inhibition, validating this enzyme as a viable drug discovery target for Gram-negative pathogens. A search for novel inhibitors of PheRS yielded three novel chemical starting points. NMR studies were used to confirm direct target engagement for phenylalanine-competitive hits. The crystallographic structure of Pseudomonas aeruginosa PheRS defined the binding modes of these hits and revealed an auxiliary hydrophobic pocket that is positioned adjacent to the phenylalanine binding site. Three viable inhibitor-resistant mutants were mapped to this pocket, suggesting that this region is a potential liability for drug discovery.

Legend

Protein

Chemical

Disease

Primary Citation of related structures