1S9A

Crystal Structure of 4-Chlorocatechol 1,2-dioxygenase from Rhodococcus opacus 1CP


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.47 Å
  • R-Value Free: 0.290 
  • R-Value Work: 0.212 

wwPDB Validation 3D Report Full Report


This is version 1.3 of the entry. See complete history

Literature

Crystal structure of 4-chlorocatechol 1,2-dioxygenase from the chlorophenol-utilizing gram-positive Rhodococcus opacus 1CP.

Ferraroni, M.Solyanikova, I.P.Kolomytseva, M.P.Scozzafava, A.Golovleva, L.Briganti, F.

(2004) J.Biol.Chem. 279: 27646-27655

  • DOI: 10.1074/jbc.M401692200

  • PubMed Abstract: 
  • The crystal structure of the 4-chlorocatechol 1,2-dioxygenase from the Gram-positive bacterium Rhodococcus opacus (erythropolis) 1CP, a Fe(III) ion-containing enzyme involved in the aerobic biodegradation of chloroaromatic compounds, has been solved ...

    The crystal structure of the 4-chlorocatechol 1,2-dioxygenase from the Gram-positive bacterium Rhodococcus opacus (erythropolis) 1CP, a Fe(III) ion-containing enzyme involved in the aerobic biodegradation of chloroaromatic compounds, has been solved by multiple wavelength anomalous dispersion using the weak anomalous signal of the two catalytic irons (1 Fe/257 amino acids) and refined at a 2.5 A resolution (R(free) 28.7%; R factor 21.4%). The analysis of the structure and its comparison with the structure of catechol 1,2-dioxygenase from Acinetobacter calcoaceticus ADP1 (Ac 1,2-CTD) highlight significant differences between these enzymes. The general topology of the present enzyme comprises two catalytic domains (one for each subunit) related by a noncrystallographic 2-fold axis and separated by a common alpha-helical zipper motif consisting of five N-terminal helices from each subunit; furthermore the C-terminal tail is shortened significantly with respect to the known Ac 1,2-CTD. The presence of two phospholipids binding in a hydrophobic tunnel along the dimer axis is shown here to be a common feature for this class of enzyme. The active site cavity presents several dissimilarities with respect to the known catechol-cleaving enzyme. The catalytic nonheme iron(III) ion is bound to the side chains of Tyr-134, Tyr-169, His-194, and His-196, and a cocrystallized benzoate ion, bound to the metal center, reveals details on a novel mode of binding of bidentate inhibitors and a distinctive hydrogen bond network with the surrounding ligands. Among the amino acid residues expected to interact with substrates, several are different from the corresponding analogs of Ac 1,2-CTD: Asp-52, Ala-53, Gly-76, Phe-78, and Cys-224; in addition, regions of largely conserved amino acid residues in the catalytic cleft show different shapes resulting from several substantial backbone and side chain shifts. The present structure is the first of intradiol dioxygenases that specifically catalyze the cleavage of chlorocatechols, key intermediates in the aerobic catabolism of toxic chloroaromatics.


    Organizational Affiliation

    Dipartimento di Chimica, Università di Firenze, Via della Lastruccia 3, Sesto Fiorentino I-50019, Italy.




Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
Chlorocatechol 1,2-dioxygenase
A, B
257Rhodococcus opacusMutation(s): 0 
Gene Names: clcA
EC: 1.13.11.-
Find proteins for O67987 (Rhodococcus opacus)
Go to UniProtKB:  O67987
Small Molecules
Ligands 4 Unique
IDChainsName / Formula / InChI Key2D Diagram3D Interactions
HGP
Query on HGP

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Download CCD File 
A, B
(1-HEXADECANOYL-2-TETRADECANOYL-GLYCEROL-3-YL) PHOSPHONYL CHOLINE
C38 H77 N O8 P
UIXXHROAQSBBOV-PSXMRANNSA-O
 Ligand Interaction
BEZ
Query on BEZ

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Download CCD File 
A, B
BENZOIC ACID
C7 H6 O2
WPYMKLBDIGXBTP-UHFFFAOYSA-N
 Ligand Interaction
FE
Query on FE

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Download CCD File 
A, B
FE (III) ION
Fe
VTLYFUHAOXGGBS-UHFFFAOYSA-N
 Ligand Interaction
TAM
Query on TAM

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Download CCD File 
A
TRIS(HYDROXYETHYL)AMINOMETHANE
C7 H17 N O3
GKODZWOPPOTFGA-UHFFFAOYSA-N
 Ligand Interaction
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.47 Å
  • R-Value Free: 0.290 
  • R-Value Work: 0.212 
  • Space Group: P 63 2 2
Unit Cell:
Length (Å)Angle (°)
a = 89.328α = 90.00
b = 89.328β = 90.00
c = 313.395γ = 120.00
Software Package:
Software NamePurpose
MAR345data collection
SCALEPACKdata scaling
SOLVEphasing
REFMACrefinement

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History 

Deposition Data

Revision History 

  • Version 1.0: 2004-06-01
    Type: Initial release
  • Version 1.1: 2008-04-29
    Type: Version format compliance
  • Version 1.2: 2011-07-13
    Type: Version format compliance
  • Version 1.3: 2017-10-11
    Type: Refinement description