1T0Q

Structure of the Toluene/o-Xylene Monooxygenase Hydroxylase


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.15 Å
  • R-Value Free: 0.225 
  • R-Value Work: 0.199 

wwPDB Validation 3D Report Full Report


This is version 1.2 of the entry. See complete history

Literature

Crystal Structure of the Toluene/o-Xylene Monooxygenase Hydroxylase from Pseudomonas stutzeri OX1: INSIGHT INTO THE SUBSTRATE SPECIFICITY, SUBSTRATE CHANNELING, AND ACTIVE SITE TUNING OF MULTICOMPONENT MONOOXYGENASES.

Sazinsky, M.H.Bard, J.Di Donato, A.Lippard, S.J.

(2004) J.Biol.Chem. 279: 30600-30610

  • DOI: 10.1074/jbc.M400710200
  • Primary Citation of Related Structures:  

  • PubMed Abstract: 
  • The four-component toluene/o-xylene monooxygenase (ToMO) from Pseudomonas stutzeri OX1 is capable of oxidizing arenes, alkenes, and haloalkanes at a carboxylate-bridged diiron center similar to that of soluble methane monooxygenase (sMMO). The remark ...

    The four-component toluene/o-xylene monooxygenase (ToMO) from Pseudomonas stutzeri OX1 is capable of oxidizing arenes, alkenes, and haloalkanes at a carboxylate-bridged diiron center similar to that of soluble methane monooxygenase (sMMO). The remarkable variety of substrates accommodated by ToMO invites applications ranging from bioremediation to the regio- and enantiospecific oxidation of hydrocarbons on an industrial scale. We report here the crystal structures of the ToMO hydroxylase (ToMOH), azido ToMOH, and ToMOH containing the product analogue 4-bromophenol to 2.3 A or greater resolution. The catalytic diiron(III) core resembles that of the sMMO hydroxylase, but aspects of the alpha2beta2gamma2 tertiary structure are notably different. Of particular interest is a 6-10 A-wide channel of approximately 35 A in length extending from the active site to the protein surface. The presence of three bromophenol molecules in this space confirms this route as a pathway for substrate entrance and product egress. An analysis of the ToMOH active site cavity offers insights into the different substrate specificities of multicomponent monooxygenases and explains the behavior of mutant forms of homologous enzymes described in the literature.


    Organizational Affiliation

    Department of Chemistry, Massachusetts Institute of Technology, Cambridge, Massachusetts 02139, USA.




Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
toluene, o-xylene monooxygenase oxygenase subunit
A
498Pseudomonas stutzeriMutation(s): 0 
Gene Names: touA
Find proteins for O87798 (Pseudomonas stutzeri)
Go to UniProtKB:  O87798
Entity ID: 2
MoleculeChainsSequence LengthOrganismDetails
toluene, o-xylene monooxygenase oxygenase subunit
B
330Pseudomonas stutzeriMutation(s): 0 
Gene Names: touE
Find proteins for O87802 (Pseudomonas stutzeri)
Go to UniProtKB:  O87802
Entity ID: 3
MoleculeChainsSequence LengthOrganismDetails
touB
C
86Pseudomonas stutzeriMutation(s): 0 
Gene Names: touB
Find proteins for O87799 (Pseudomonas stutzeri)
Go to UniProtKB:  O87799
Small Molecules
Ligands 4 Unique
IDChainsName / Formula / InChI Key2D Diagram3D Interactions
MCR
Query on MCR

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Download CCD File 
A
SULFANYLACETIC ACID
MERCAPTOACETIC ACID
C2 H4 O2 S
CWERGRDVMFNCDR-UHFFFAOYSA-N
 Ligand Interaction
SO4
Query on SO4

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Download CCD File 
B
SULFATE ION
O4 S
QAOWNCQODCNURD-UHFFFAOYSA-L
 Ligand Interaction
OH
Query on OH

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Download CCD File 
A
HYDROXIDE ION
H O
XLYOFNOQVPJJNP-UHFFFAOYSA-M
 Ligand Interaction
FE
Query on FE

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Download CCD File 
A
FE (III) ION
Fe
VTLYFUHAOXGGBS-UHFFFAOYSA-N
 Ligand Interaction
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.15 Å
  • R-Value Free: 0.225 
  • R-Value Work: 0.199 
  • Space Group: P 31 2 1
Unit Cell:
Length (Å)Angle (°)
a = 182.805α = 90.00
b = 182.805β = 90.00
c = 68.036γ = 120.00
Software Package:
Software NamePurpose
CNSrefinement
DENZOdata reduction
SCALEPACKdata scaling
CNSphasing

Structure Validation

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Entry History 

Deposition Data

Revision History 

  • Version 1.0: 2004-07-27
    Type: Initial release
  • Version 1.1: 2008-04-30
    Type: Version format compliance
  • Version 1.2: 2011-07-13
    Type: Derived calculations, Version format compliance