3O1V

Iron-Catalyzed Oxidation Intermediates Captured in A DNA Repair Dioxygenase


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.9 Å
  • R-Value Free: 0.238 
  • R-Value Work: 0.190 

wwPDB Validation 3D Report Full Report


This is version 1.3 of the entry. See complete history

Literature

Iron-catalysed oxidation intermediates captured in a DNA repair dioxygenase.

Yi, C.Jia, G.Hou, G.Dai, Q.Zhang, W.Zheng, G.Jian, X.Yang, C.G.Cui, Q.He, C.

(2010) Nature 468: 330-333

  • DOI: 10.1038/nature09497
  • Primary Citation of Related Structures:  

  • PubMed Abstract: 
  • Mononuclear iron-containing oxygenases conduct a diverse variety of oxidation functions in biology, including the oxidative demethylation of methylated nucleic acids and histones. Escherichia coli AlkB is the first such enzyme that was discovered to ...

    Mononuclear iron-containing oxygenases conduct a diverse variety of oxidation functions in biology, including the oxidative demethylation of methylated nucleic acids and histones. Escherichia coli AlkB is the first such enzyme that was discovered to repair methylated nucleic acids, which are otherwise cytotoxic and/or mutagenic. AlkB human homologues are known to play pivotal roles in various processes. Here we present structural characterization of oxidation intermediates for these demethylases. Using a chemical cross-linking strategy, complexes of AlkB-double stranded DNA (dsDNA) containing 1,N(6)-etheno adenine (εA), N(3)-methyl thymine (3-meT) and N(3)-methyl cytosine (3-meC) are stabilized and crystallized, respectively. Exposing these crystals, grown under anaerobic conditions containing iron(II) and α-ketoglutarate (αKG), to dioxygen initiates oxidation in crystallo. Glycol (from εA) and hemiaminal (from 3-meT) intermediates are captured; a zwitterionic intermediate (from 3-meC) is also proposed, based on crystallographic observations and computational analysis. The observation of these unprecedented intermediates provides direct support for the oxidative demethylation mechanism for these demethylases. This study also depicts a general mechanistic view of how a methyl group is oxidatively removed from different biological substrates.


    Organizational Affiliation

    Department of Chemistry and Institute for Biophysical Dynamics, The University of Chicago, 929 East 57th Street, Chicago, Illinois 60637, USA.




Macromolecules

Find similar proteins by: Sequence  |  Structure


Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
Alpha-ketoglutarate-dependent dioxygenase AlkB
A
206Escherichia coli (strain K12)Mutation(s): 1 
Gene Names: alkB (aidD)
EC: 1.14.11.33
Find proteins for P05050 (Escherichia coli (strain K12))
Go to UniProtKB:  P05050
Entity ID: 2
MoleculeChainsLengthOrganism
DNA (5'-D(*AP*GP*GP*TP*AP*AP*(MDJ)P*AP*CP*CP*GP*T)-3')B12N/A
Entity ID: 3
MoleculeChainsLengthOrganism
DNA (5'-D(*AP*AP*CP*GP*GP*TP*AP*TP*TP*AP*CP*CP*T)-3')C13N/A
Small Molecules
Ligands 2 Unique
IDChainsName / Formula / InChI Key2D Diagram3D Interactions
SIN
Query on SIN

Download SDF File 
Download CCD File 
A
SUCCINIC ACID
C4 H6 O4
KDYFGRWQOYBRFD-UHFFFAOYSA-N
 Ligand Interaction
FE
Query on FE

Download SDF File 
Download CCD File 
A
FE (III) ION
Fe
VTLYFUHAOXGGBS-UHFFFAOYSA-N
 Ligand Interaction
Modified Residues  2 Unique
IDChainsTypeFormula2D DiagramParent
MDJ
Query on MDJ
B
DNA linkingC11 H17 N2 O8 P

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2YR
Query on 2YR
B
NON-POLYMERC11 H18 N3 O7 P S

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Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.9 Å
  • R-Value Free: 0.238 
  • R-Value Work: 0.190 
  • Space Group: P 1 21 1
Unit Cell:
Length (Å)Angle (°)
a = 41.582α = 90.00
b = 76.240β = 108.04
c = 52.413γ = 90.00
Software Package:
Software NamePurpose
HKL-2000data scaling
PHASERphasing
HKL-2000data collection
HKL-2000data reduction
REFMACrefinement

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History 

Deposition Data

Revision History 

  • Version 1.0: 2010-11-17
    Type: Initial release
  • Version 1.1: 2011-07-13
    Type: Version format compliance
  • Version 1.2: 2013-06-19
    Type: Database references
  • Version 1.3: 2014-05-28
    Type: Non-polymer description, Structure summary