1U1X

Structure and function of phenazine-biosynthesis protein PhzF from Pseudomonas fluorescens 2-79


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.88 Å
  • R-Value Free: 0.197 
  • R-Value Work: 0.150 
  • R-Value Observed: 0.152 

wwPDB Validation 3D Report Full Report


This is version 1.2 of the entry. See complete history


Literature

Structure and function of the phenazine biosynthetic protein PhzF from Pseudomonas fluorescens.

Blankenfeldt, W.Kuzin, A.P.Skarina, T.Korniyenko, Y.Tong, L.Bayer, P.Janning, P.Thomashow, L.S.Mavrodi, D.V.

(2004) Proc Natl Acad Sci U S A 101: 16431-16437

  • DOI: 10.1073/pnas.0407371101
  • Structures With Same Primary Citation

  • PubMed Abstract: 
  • Phenazines produced by Pseudomonas and Streptomyces spp. are heterocyclic nitrogen-containing metabolites with antibiotic, antitumor, and antiparasitic activity. The antibiotic properties of pyocyanin, produced by Pseudomonas aeruginosa, were recognized in the 1890s, although this blue phenazine is now known to be a virulence factor in human disease ...

    Phenazines produced by Pseudomonas and Streptomyces spp. are heterocyclic nitrogen-containing metabolites with antibiotic, antitumor, and antiparasitic activity. The antibiotic properties of pyocyanin, produced by Pseudomonas aeruginosa, were recognized in the 1890s, although this blue phenazine is now known to be a virulence factor in human disease. Despite their biological significance, the biosynthesis of phenazines is not fully understood. Here we present structural and functional studies of PhzF, an enzyme essential for phenazine synthesis in Pseudomonas spp. PhzF shares topology with diaminopimelate epimerase DapF but lacks the same catalytic residues. The structure of PhzF in complex with its substrate, trans-2,3-dihydro-3-hydroxyanthranilic acid, suggests that it is an isomerase using the conserved glutamate E45 to abstract a proton from C3 of the substrate. The proton is returned to C1 of the substrate after rearrangement of the double-bond system, yielding an enol that converts to the corresponding ketone. PhzF is a dimer that may be bifunctional, providing a shielded cavity for ketone dimerization via double Schiff-base formation to produce the phenazine scaffold. Our proposed mechanism is supported by mass and NMR spectroscopy. The results are discussed in the context of related structures and protein sequences of unknown biochemical function.


    Organizational Affiliation

    Max Planck Institute of Molecular Physiology, Otto-Hahn-Strasse 11, 44227 Dortmund, Germany.



Macromolecules

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Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
Phenazine biosynthesis protein phzFA, B298Pseudomonas fluorescensMutation(s): 0 
Gene Names: phzF
EC: 5.3.3.17
Find proteins for Q51792 (Pseudomonas fluorescens)
Explore Q51792 
Go to UniProtKB:  Q51792
Protein Feature View
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  • Reference Sequence
Small Molecules
Ligands 1 Unique
IDChainsName / Formula / InChI Key2D Diagram3D Interactions
HHA
Query on HHA

Download CCD File 
A, B
(2S,3S)-TRANS-2,3-DIHYDRO-3-HYDROXYANTHRANILIC ACID
C7 H9 N O3
XBTXTLKLSHACSS-WDSKDSINSA-N
 Ligand Interaction
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.88 Å
  • R-Value Free: 0.197 
  • R-Value Work: 0.150 
  • R-Value Observed: 0.152 
  • Space Group: P 21 21 2
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 92.6α = 90
b = 99.86β = 90
c = 57γ = 90
Software Package:
Software NamePurpose
REFMACrefinement
MOSFLMdata reduction
XDSdata scaling
MOLREPphasing

Structure Validation

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Entry History 

Deposition Data

Revision History 

  • Version 1.0: 2004-11-02
    Type: Initial release
  • Version 1.1: 2008-04-30
    Changes: Version format compliance
  • Version 1.2: 2011-07-13
    Changes: Advisory, Version format compliance