1SK7

Structural Basis for Novel Delta-Regioselective Heme Oxygenation in the Opportunistic Pathogen Pseudomonas aeruginosa


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.60 Å
  • R-Value Free: 0.273 
  • R-Value Work: 0.235 
  • R-Value Observed: 0.273 

wwPDB Validation   3D Report Full Report


This is version 1.3 of the entry. See complete history


Literature

Structural basis for novel delta-regioselective heme oxygenation in the opportunistic pathogen Pseudomonas aeruginosa

Friedman, J.Lad, L.Li, H.Wilks, A.Poulos, T.L.

(2004) Biochemistry 43: 5239-5245

  • DOI: 10.1021/bi049687g
  • Primary Citation of Related Structures:  
    1SK7

  • PubMed Abstract: 
  • The Gram-negative bacterium Pseudomonas aeruginosa contains a heme oxygenase (pa-HO) that primarily oxygenates the delta-meso heme carbon [Caignan, G. A., Deshmukh, R., Wilks, A., Zeng, Y., Huang, H. W., Moenne-Loccoz, P., Bunce, R. A., Eastman, M. A., and Rivera, M ...

    The Gram-negative bacterium Pseudomonas aeruginosa contains a heme oxygenase (pa-HO) that primarily oxygenates the delta-meso heme carbon [Caignan, G. A., Deshmukh, R., Wilks, A., Zeng, Y., Huang, H. W., Moenne-Loccoz, P., Bunce, R. A., Eastman, M. A., and Rivera, M. (2002) J. Am. Chem. Soc. 124, 14879-14892]. This differs from other previously characterized heme oxygenases, which display regioselectivity for the alpha-meso heme carbon. Here we report the crystal structure of pa-HO at 1.60 A resolution and compare it to the 1.50 A structure of nm-HO from Neisseria meningitidis [Schuller, D. J., Zhu, W., Stojiljkovic, I., Wilks, A., and Poulos, T. L. (2001) Biochemistry 40, 11552-11558]. The crystal structure of pa-HO maintains the same overall fold as other bacterial and mammalian heme oxygenases, including a conserved network of hydrogen-bonded solvent molecules important for dioxygen activation. The novel delta-regioselectivity of heme oxygenation observed by pa-HO is due to the heme being rotated by approximately 100 degrees, which places the delta-meso heme carbon in the same position as the alpha-meso heme carbon in other heme oxygenases. The main interaction in pa-HO that stabilizes the unique heme orientation is a salt bridge between Lys132 and the heme 7-propionate, as well as hydrophobic contacts involving Leu29, Val33, and Phe189 with the heme methyl and vinyl groups.


    Organizational Affiliation

    Department of Molecular Biology and Biochemistry, University of California, Irvine, California 92697, USA.



Macromolecules
Find similar proteins by:  (by identity cutoff)  |  Structure
Entity ID: 1
MoleculeChainsSequence LengthOrganismDetailsImage
hypothetical protein pa-HO A198Pseudomonas aeruginosaMutation(s): 0 
Gene Names: 
EC: 1.14.99.3
Find proteins for O69002 (Pseudomonas aeruginosa)
Explore O69002 
Go to UniProtKB:  O69002
Protein Feature View
Expand
  • Reference Sequence
Small Molecules
Ligands 2 Unique
IDChainsName / Formula / InChI Key2D Diagram3D Interactions
HEM
Query on HEM

Download Ideal Coordinates CCD File 
A
PROTOPORPHYRIN IX CONTAINING FE
C34 H32 Fe N4 O4
KABFMIBPWCXCRK-RGGAHWMASA-L
 Ligand Interaction
SO4
Query on SO4

Download Ideal Coordinates CCD File 
A
SULFATE ION
O4 S
QAOWNCQODCNURD-UHFFFAOYSA-L
 Ligand Interaction
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.60 Å
  • R-Value Free: 0.273 
  • R-Value Work: 0.235 
  • R-Value Observed: 0.273 
  • Space Group: C 1 2 1
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 86.034α = 90
b = 51.798β = 131.04
c = 63.916γ = 90
Software Package:
Software NamePurpose
HKL-2000data collection
SCALEPACKdata scaling
AMoREphasing
CNSrefinement
HKL-2000data reduction

Structure Validation

View Full Validation Report



Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 2004-06-22
    Type: Initial release
  • Version 1.1: 2008-04-29
    Changes: Version format compliance
  • Version 1.2: 2011-07-13
    Changes: Version format compliance
  • Version 1.3: 2011-11-16
    Changes: Atomic model