1SFE

ADA O6-METHYLGUANINE-DNA METHYLTRANSFERASE FROM ESCHERICHIA COLI


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.10 Å
  • R-Value Work: 0.219 

wwPDB Validation 3D Report Full Report


This is version 1.2 of the entry. See complete history


Literature

Crystal structure of a suicidal DNA repair protein: the Ada O6-methylguanine-DNA methyltransferase from E. coli.

Moore, M.H.Gulbis, J.M.Dodson, E.J.Demple, B.Moody, P.C.

(1994) EMBO J 13: 1495-1501

  • Primary Citation of Related Structures:  
    1SFE

  • PubMed Abstract: 
  • The mutagenic and carcinogenic effects of simple alkylating agents are mainly due to methylation at the O6 position of guanine in DNA. O6-methylguanine directs the incorporation of either thymine or cytosine without blocking DNA replication, resultin ...

    The mutagenic and carcinogenic effects of simple alkylating agents are mainly due to methylation at the O6 position of guanine in DNA. O6-methylguanine directs the incorporation of either thymine or cytosine without blocking DNA replication, resulting in GC to AT transition mutations. In prokaryotic and eukaryotic cells antimutagenic repair is effected by direct reversal of this DNA damage. A suicidal methyltransferase repair protein removes the methyl group from DNA to one of its own cysteine residues. The resulting self-methylation of the active site cysteine renders the protein inactive. Here we report the X-ray structure of the 19 kDa C-terminal domain of the Escherichia coli ada gene product, the prototype of these suicidal methyltransferases. In the crystal structure the active site cysteine is buried. We propose a model for the significant conformational change that the protein must undergo in order to bind DNA and effect methyl transfer.


    Related Citations: 
    • Crystal Structure of E.Coli O6-Methylguanine-DNA Methyltransferase
      Moody, P.C.E., Moore, M.H.
      (1995) Novel Approaches In Anticancer Drug Design : Molecular Modelling--new Treatment Strategies (in: Contrib Oncol , V 49) --: 16
    • Crystallization of O6-Methylguanine-DNA Methyltransferase from Escherichia Coli
      Moody, P.C., Demple, B.
      (1988) J Mol Biol 200: 751

    Organizational Affiliation

    Department of Chemistry, University of York, UK.



Macromolecules
Find similar proteins by:  (by identity cutoff)  |  Structure
Entity ID: 1
MoleculeChainsSequence LengthOrganismDetailsImage
ADA O6-METHYLGUANINE-DNA METHYLTRANSFERASEA180Escherichia coli BMutation(s): 0 
Gene Names: ADAC
EC: 2.1.1.63 (PDB Primary Data), 2.1.1 (UniProt)
Find proteins for P06134 (Escherichia coli (strain K12))
Explore P06134 
Go to UniProtKB:  P06134
Protein Feature View
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  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.10 Å
  • R-Value Work: 0.219 
  • Space Group: P 1 21 1
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 46.2α = 90
b = 45.95β = 114.06
c = 46.4γ = 90
Software Package:
Software NamePurpose
PROLSQrefinement
DENZOdata reduction
SCALEPACKdata scaling

Structure Validation

View Full Validation Report



Entry History 

Deposition Data

Revision History 

  • Version 1.0: 1996-12-23
    Type: Initial release
  • Version 1.1: 2008-03-24
    Changes: Version format compliance
  • Version 1.2: 2011-07-13
    Changes: Source and taxonomy, Version format compliance