4E9H

structure of glycosylase domain of MBD4 bound to 5hmU containing DNA


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 3 Å
  • R-Value Free: 0.258 
  • R-Value Work: 0.173 

wwPDB Validation 3D Report Full Report


This is version 1.1 of the entry. See complete history

Literature

Biochemical and structural characterization of the glycosylase domain of MBD4 bound to thymine and 5-hydroxymethyuracil-containing DNA.

Morera, S.Grin, I.Vigouroux, A.Couve, S.Henriot, V.Saparbaev, M.Ishchenko, A.A.

(2012) Nucleic Acids Res. 40: 9917-9926

  • DOI: 10.1093/nar/gks714
  • Primary Citation of Related Structures:  

  • PubMed Abstract: 
  • Active DNA demethylation in mammals occurs via hydroxylation of 5-methylcytosine to 5-hydroxymethylcytosine (5hmC) by the ten-eleven translocation family of proteins (TETs). 5hmC residues in DNA can be further oxidized by TETs to 5-carboxylcytosines ...

    Active DNA demethylation in mammals occurs via hydroxylation of 5-methylcytosine to 5-hydroxymethylcytosine (5hmC) by the ten-eleven translocation family of proteins (TETs). 5hmC residues in DNA can be further oxidized by TETs to 5-carboxylcytosines and/or deaminated by the Activation Induced Deaminase/Apolipoprotein B mRNA-editing enzyme complex family proteins to 5-hydromethyluracil (5hmU). Excision and replacement of these intermediates is initiated by DNA glycosylases such as thymine-DNA glycosylase (TDG), methyl-binding domain protein 4 (MBD4) and single-strand specific monofunctional uracil-DNA glycosylase 1 in the base excision repair pathway. Here, we report detailed biochemical and structural characterization of human MBD4 which contains mismatch-specific TDG activity. Full-length as well as catalytic domain (residues 426-580) of human MBD4 (MBD4(cat)) can remove 5hmU when opposite to G with good efficiency. Here, we also report six crystal structures of human MBD4(cat): an unliganded form and five binary complexes with duplex DNA containing a T•G, 5hmU•G or AP•G (apurinic/apyrimidinic) mismatch at the target base pair. These structures reveal that MBD4(cat) uses a base flipping mechanism to specifically recognize thymine and 5hmU. The recognition mechanism of flipped-out 5hmU bases in MBD4(cat) active site supports the potential role of MBD4, together with TDG, in maintenance of genome stability and active DNA demethylation in mammals.


    Organizational Affiliation

    Laboratoire d'Enzymologie et Biochimie Structurales, CNRS, Gif-sur-Yvette Cedex, F-91198, France. morera@lebs.cnrs-gif.fr




Macromolecules

Find similar proteins by: Sequence  |  Structure


Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
Methyl-CpG-binding domain protein 4
A
161Homo sapiensMutation(s): 1 
Gene Names: MBD4 (MED1)
EC: 3.2.2.-
Find proteins for O95243 (Homo sapiens)
Go to Gene View: MBD4
Go to UniProtKB:  O95243
Entity ID: 2
MoleculeChainsLengthOrganism
DNA (5'-D(*CP*CP*AP*GP*CP*GP*(5HU)P*GP*CP*AP*GP*C)-3')C12synthetic construct
Entity ID: 3
MoleculeChainsLengthOrganism
DNA (5'-D(*GP*CP*TP*GP*CP*GP*CP*GP*CP*TP*GP*G)-3')D12synthetic construct
Small Molecules
Modified Residues  1 Unique
IDChainsTypeFormula2D DiagramParent
5HU
Query on 5HU
C
DNA LINKINGC10 H15 N2 O9 PDU
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 3 Å
  • R-Value Free: 0.258 
  • R-Value Work: 0.173 
  • Space Group: P 21 21 21
Unit Cell:
Length (Å)Angle (°)
a = 41.090α = 90.00
b = 96.700β = 90.00
c = 55.100γ = 90.00
Software Package:
Software NamePurpose
BUSTERrefinement
PHASERphasing
XDSdata scaling
DNAdata collection
XDSdata reduction

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History 

Deposition Data

Revision History 

  • Version 1.0: 2012-08-08
    Type: Initial release
  • Version 1.1: 2012-11-07
    Type: Database references