1U9T

Crystal Structure Analysis of ChuS, an E. coli Heme Oxygenase


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.16 Å
  • R-Value Free: 0.283 
  • R-Value Work: 0.207 
  • R-Value Observed: 0.207 

wwPDB Validation 3D Report Full Report


This is version 1.2 of the entry. See complete history


Literature

Identification of an Escherichia coli O157:H7 heme oxygenase with tandem functional repeats

Suits, M.D.Pal, G.P.Nakatsu, K.Matte, A.Cygler, M.Jia, Z.

(2005) Proc Natl Acad Sci U S A 102: 16955-16960

  • DOI: 10.1073/pnas.0504289102
  • Structures With Same Primary Citation

  • PubMed Abstract: 
  • Heme oxygenases (HOs) catalyze the oxidation of heme to biliverdin, carbon monoxide (CO), and free iron. Iron acquisition is critical for invading microorganisms to enable survival and growth. Here we report the crystal structure of ChuS, which displ ...

    Heme oxygenases (HOs) catalyze the oxidation of heme to biliverdin, carbon monoxide (CO), and free iron. Iron acquisition is critical for invading microorganisms to enable survival and growth. Here we report the crystal structure of ChuS, which displays a previously uncharacterized fold and is unique compared with other characterized HOs. Despite only 19% sequence identity between the N- and C-terminal halves, these segments of ChuS represent a structural duplication, with a root-mean-square deviation of 2.1 A between the two repeats. ChuS is capable of using ascorbic acid or cytochrome P450 reductase-NADPH as electron sources for heme oxygenation. CO detection confirmed that ChuS is a HO, and we have identified it in pathogenic Escherichia coli O157:H7. Based on sequence analysis, this HO is present in many bacteria, although not in the E. coli K-12 strain. The N- and C-terminal halves of ChuS are each a functional HO.


    Organizational Affiliation

    Departments of Biochemistry and Pharmacology and Toxicology, Queen's University, Kingston, Ontario, Canada K7L 3N6.



Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
putative heme/hemoglobin transport proteinA354Escherichia coli O157:H7 str. EDL933Mutation(s): 0 
Gene Names: ChuS
Find proteins for Q8X5N8 (Escherichia coli O157:H7)
Explore Q8X5N8 
Go to UniProtKB:  Q8X5N8
Protein Feature View
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  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.16 Å
  • R-Value Free: 0.283 
  • R-Value Work: 0.207 
  • R-Value Observed: 0.207 
  • Space Group: P 1 21 1
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 41.684α = 90
b = 57.88β = 96.02
c = 59.578γ = 90
Software Package:
Software NamePurpose
HKL-2000data collection
SCALEPACKdata scaling
SOLVEphasing
CNSrefinement

Structure Validation

View Full Validation Report



Entry History 

Deposition Data

Revision History 

  • Version 1.0: 2005-10-25
    Type: Initial release
  • Version 1.1: 2008-04-30
    Changes: Version format compliance
  • Version 1.2: 2011-07-13
    Changes: Source and taxonomy, Version format compliance