1QNT

X-ray structure of human O6alkylguanine-DNA alkyltransferase


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.9 Å
  • R-Value Free: 0.221 
  • R-Value Work: 0.198 

wwPDB Validation 3D Report Full Report


This is version 1.2 of the entry. See complete history

Literature

Crystal Structure of the Human O(6)-Alkylguanine-DNA Alkyltransferase.

Wibley, J.E.A.Pegg, A.E.Moody, P.C.E.

(2000) Nucleic Acids Res. 28: 393


  • PubMed Abstract: 
  • The mutagenic and carcinogenic effects of simple alkylating agents are mainly due to O(6)-alkylation of guanine in DNA. This lesion results in transition mutations. In both prokaryotic and eukaryotic cells, repair is effected by direct reversal of th ...

    The mutagenic and carcinogenic effects of simple alkylating agents are mainly due to O(6)-alkylation of guanine in DNA. This lesion results in transition mutations. In both prokaryotic and eukaryotic cells, repair is effected by direct reversal of the damage by a suicide protein, O(6)-alkylguanine-DNA alkyltransferase. The alkyltransferase removes the alkyl group to one of its own cysteine residues. However, this mechanism for preserving genomic integrity limits the effectiveness of certain alkylating anticancer agents. A high level of the alkyltransferase in many tumour cells renders them resistant to such drugs. Here we report the X-ray structure of the human alkyltransferase solved using the technique of multiple wavelength anomalous dispersion. This structure explains the markedly different specificities towards various O(6)-alkyl lesions and inhibitors when compared with the Escherichia coli protein (for which the structure has already been determined). It is also used to interpret the behaviour of certain mutant alkyltransferases to enhance biochemical understanding of the protein. Further examination of the various models proposed for DNA binding is also permitted. This structure may be useful for the design and refinement of drugs as chemoenhancers of alkylating agent chemotherapy.


    Related Citations: 
    • 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.E.
      (1994) Embo J. 13: 1495
    • A Homology Model of the 3-Dimensional Structure of Human O-6-Alklguanine-DNA Alkyltransferase Based on the Crystal Structure of the C-Terminal Domain of the Ada Protein from Escherichia Coli
      Wibley J, J.E.A.,Mckie, H.,Embrey, K.,Marks, D.S.,Douglas, K.T.,Moore, M.H.,Moody, P.C.E.
      (1995) Anti-Cancer Drug Des. 10: 75


    Organizational Affiliation

    Department of Biochemistry, University of Leicester, University Road, Leicester LE1 7RH, UK.




Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
METHYLATED-DNA--PROTEIN-CYSTEINE METHYLTRANSFERASE
A
176Homo sapiensMutation(s): 0 
Gene Names: MGMT
EC: 2.1.1.63
Find proteins for P16455 (Homo sapiens)
Go to Gene View: MGMT
Go to UniProtKB:  P16455
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.9 Å
  • R-Value Free: 0.221 
  • R-Value Work: 0.198 
  • Space Group: P 31 2 1
Unit Cell:
Length (Å)Angle (°)
a = 71.877α = 90.00
b = 71.877β = 90.00
c = 72.578γ = 120.00
Software Package:
Software NamePurpose
DENZOdata reduction
CNSrefinement
SCALEPACKdata scaling
SOLVEphasing

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History 

Deposition Data

Revision History 

  • Version 1.0: 1999-12-16
    Type: Initial release
  • Version 1.1: 2011-05-08
    Type: Version format compliance
  • Version 1.2: 2011-07-13
    Type: Version format compliance