MGMT/hAGT mediated DNA Damage Reversal

Stable Identifier
Reaction [transition]
Homo sapiens
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MGMT, just like its E.coli homolog Ada, is an O-6-methylguanine transferase (Lindahl et al. 1983, Moore et al. 1994) that removes the methyl group from the guanine and transfers it to the cysteine residue at position 145 on the protein itself. MGMT thus methylated is not regenerated, as the S-methylcysteine is very stable. This is an energetically expensive approach to DNA repair as one entire protein molecule is sacrificed per lesion that is corrected in this manner (Rasimas et al. 2004, Tubbs et al. 2007, Mitra and Kaina 1993).
Literature References
PubMed ID Title Journal Year
17485252 DNA binding, nucleotide flipping, and the helix-turn-helix motif in base repair by O6-alkylguanine-DNA alkyltransferase and its implications for cancer chemotherapy

Pegg, AE, Tainer, JA, Tubbs, JL

DNA Repair (Amst.) 2007
14691244 Active-site alkylation destabilizes human O6-alkylguanine DNA alkyltransferase

Rasimas, JJ, Pegg, AE, Ropson, IJ, Dalessio, PA, Fried, MG

Protein Sci. 2004
8156986 Crystal structure of a suicidal DNA repair protein: the Ada O6-methylguanine-DNA methyltransferase from E. coli

Dodson, EJ, Moore, MH, Demple, B, Gulbis, JM, Moody, PC

EMBO J. 1994
6765195 Suicide inactivation of the E. coli O6-methylguanine-DNA methyltransferase

Demple, B, Lindahl, T, Robins, P

EMBO J. 1982
8434121 Regulation of repair of alkylation damage in mammalian genomes.

Mitra, S, Kaina, B

Prog Nucleic Acid Res Mol Biol 1993
Event Information
Catalyst Activity

methylated-DNA-[protein]-cysteine S-methyltransferase activity of MGMT:Zn2+:6-OMeG-dsDNA [nucleoplasm]

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