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
- PubMed: 8156986
- Also Cited By: 1QNT
- PubMed Abstract:
- 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
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.
Department of Chemistry, University of York, UK.