1QNT

X-ray structure of human O6alkylguanine-DNA alkyltransferase


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.90 Å
  • R-Value Free: 0.221 
  • R-Value Work: 0.198 
  • R-Value Observed: 0.198 

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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

  • DOI: https://doi.org/10.1093/nar/28.2.393
  • Primary Citation of Related Structures:  
    1QNT

  • 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 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.


  • Organizational Affiliation

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


Macromolecules
Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
METHYLATED-DNA--PROTEIN-CYSTEINE METHYLTRANSFERASE176Homo sapiensMutation(s): 0 
EC: 2.1.1.63
UniProt & NIH Common Fund Data Resources
Find proteins for P16455 (Homo sapiens)
Explore P16455 
Go to UniProtKB:  P16455
GTEx:  ENSG00000170430 
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupP16455
Sequence Annotations
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  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.90 Å
  • R-Value Free: 0.221 
  • R-Value Work: 0.198 
  • R-Value Observed: 0.198 
  • Space Group: P 31 2 1
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 71.877α = 90
b = 71.877β = 90
c = 72.578γ = 120
Software Package:
Software NamePurpose
CNSrefinement
DENZOdata reduction
SCALEPACKdata scaling
SOLVEphasing

Structure Validation

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Entry History 

Deposition Data

Revision History  (Full details and data files)

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