Biological Assembly 1  

 3D View: Structure | 1D-3D View | Electron Density | Validation Report

Global Symmetry: Cyclic - C2  (3D View)
Global Stoichiometry: Homo 2-mer - A2 

Biological assembly 1 assigned by authors and generated by PISA,PQS (software)

Macromolecule Content

• Total Structure Weight: 72.79 kDa 
• Atom Count: 5695 
• Modelled Residue Count: 660 
• Deposited Residue Count: 668 
• Unique protein chains: 1

2IP2

Structure of the Pyocyanin Biosynthetic Protein PhzM

• PDB DOI: 10.2210/pdb2IP2/pdb

• Classification: TRANSFERASE
• Organism(s): Pseudomonas aeruginosa PAO1
• Expression System: Escherichia coli
• Mutation(s): No 


• Deposited: 2006-10-11 Released: 2006-10-24 
• Deposition Author(s): Ladner, J.E., Parsons, J.F., Robinson, H., Shi, K.

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Experimental Data Snapshot

• Method: X-RAY DIFFRACTION
• Resolution: 1.80 Å
• R-Value Free: 0.247 
• R-Value Work: 0.194 
• R-Value Observed: 0.196 

Literature

Structural and functional analysis of the pyocyanin biosynthetic protein PhzM from Pseudomonas aeruginosa.

Parsons, J.F., Greenhagen, B.T., Shi, K., Calabrese, K., Robinson, H., Ladner, J.E.

(2007) Biochemistry 46: 1821-1828

• PubMed: 17253782 
• DOI: 10.1021/bi6024403
• Primary Citation of Related Structures:  
  2IP2


• PubMed Abstract: 
  

Pyocyanin is a biologically active phenazine produced by the human pathogen Pseudomonas aeruginosa. It is thought to endow P. aeruginosa with a competitive growth advantage in colonized tissue and is also thought to be a virulence factor in diseases such as cystic fibrosis and AIDS where patients are commonly infected by pathogenic Pseudomonads due to their immunocompromised state. Pyocyanin is also a chemically interesting compound due to its unusual oxidation-reduction activity. Phenazine-1-carboxylic acid, the precursor to the bioactive phenazines, is synthesized from chorismic acid by enzymes encoded in a seven-gene cistron in P. aeruginosa and in other Pseudomonads. Phenzine-1-carboxylic acid is believed to be converted to pyocyanin by the sequential actions of the putative S-adenosylmethionine-dependent N-methyltransferase PhzM and the putative flavin-dependent hydroxylase PhzS. Here we report the 1.8 A crystal structure of PhzM determined by single anomalous dispersion. Unlike many methyltransferases, PhzM is a dimer in solution. The 36 kDa PhzM polypeptide folds into three domains. The C-terminal domain exhibits the alpha/beta-hydrolase fold typical of small molecule methyltransferases. Two smaller N-terminal domains form much of the dimer interface. Structural alignments with known methyltransferases show that PhzM is most similar to the plant O-methyltransferases that are characterized by an unusual intertwined dimer interface. The structure of PhzM contains no ligands, and the active site is open and solvent-exposed when compared to structures of similar enzymes. In vitro experiments using purified PhzM alone demonstrate that it has little or no ability to methylate phenzine-1-carboxylic acid. However, when the putative hydroxylase PhzS is included, pyocyanin is readily produced. This observation suggests that a mechanism has evolved in P. aeruginosa that ensures efficient production of pyocyanin via the prevention of the formation and release of an unstable and potentially deleterious intermediate.

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Organizational Affiliation: 

Center for Advanced Research in Biotechnology, University of Maryland Biotechnology Institute, Rockville, Maryland 20850, USA. [e-mail]

Macromolecules

Entity ID: 1
Molecule	Chains	Sequence Length	Organism	Details	Image
Probable phenazine-specific methyltransferase	A, B	334	Pseudomonas aeruginosa PAO1	Mutation(s): 0  Gene Names: phzM, PA4209 EC: 2.1.1 (PDB Primary Data), 2.1.1.327 (UniProt)
UniProt
Find proteins for Q9HWH2 (Pseudomonas aeruginosa (strain ATCC 15692 / DSM 22644 / CIP 104116 / JCM 14847 / LMG 12228 / 1C / PRS 101 / PAO1)) Explore Q9HWH2  Go to UniProtKB:  Q9HWH2

Experimental Data & Validation

Experimental Data

• Method: X-RAY DIFFRACTION
• Resolution: 1.80 Å
• R-Value Free: 0.247 
• R-Value Work: 0.194 
• R-Value Observed: 0.196 
• Space Group: P 1

Unit Cell:

Length ( Å )	Angle ( ˚ )
a = 46.97	α = 97.47
b = 62.41	β = 105.37
c = 68.75	γ = 108.09

Software Package:

Software Name	Purpose
REFMAC	refinement
CrystalClear	data collection
d*TREK	data reduction
d*TREK	data scaling
RESOLVE	phasing

Structure Validation

Entry History 

Deposition Data

• Deposited Date: 2006-10-11 
• Released Date: 2006-10-24 
Deposition Author(s): Ladner, J.E., Parsons, J.F., Robinson, H., Shi, K.

Revision History  

• Version 1.0: 2006-10-24
  Type: Initial release
  
• Version 1.1: 2007-10-11
  Changes: Version format compliance
• Version 1.2: 2011-07-13
  Changes: Derived calculations, Source and taxonomy, Version format compliance