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Description
Cancer chemotherapeutic alkylating agents (e.g. BCNU,) act by inducing formation of lethal cross-links at the O-alkylguanine position in DNA. MGMT transfers alkyl adducts from the O-position of guanine in DNA (prior to cross-link formation) to a cysteine residue in its own sequence, thereby restoring DNA to its intact state. This transfer inactivates the MGMT enzyme and is irreversible, hence the level of MGMT in a cell is directly proportional to the level of DNA-damage it can tolerate. In normal tissues, MGMT acts as a suppressor of mutation and carcinogenesis. Tumors with high levels of MGMT are likely be drug-resistant.Synonyms: 6-O-methylguanine-DNA methyltransferase, Methylated-DNA-protein-cysteine methyltransferase, O-6-methylguanine-DNA-alkyltransferase