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Information on EC - methylated-DNA-[protein]-cysteine S-methyltransferase

for references in articles please use BRENDA:EC2.1.1.63
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IUBMB Comments
This protein is involved in the repair of methylated DNA. Unlike EC, DNA-3-methyladenine glycosidase I and EC, DNA-3-methyladenine glycosidase II, which remove the methylated base leaving an apurinic/apyrimidinic site, this enzyme transfers the methyl group from the methylated DNA to an internal cysteine residue, leaving an intact nucleotide. Since the methyl transfer is irreversible, the enzyme can only catalyse a single turnover.
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The expected taxonomic range for this enzyme is: Bacteria, Archaea, Eukaryota
o6-methylguanine-dna methyltransferase, atase, o6-alkylguanine-dna alkyltransferase, ada protein, o6-methylguanine dna methyltransferase, o6-methylguanine-dna-methyltransferase, o6-alkylguanine dna alkyltransferase, o6-methylguanine methyltransferase, o6-mgmt, methylguanine dna methyltransferase, more
DNA (containing 4-O-methylthymine) + protein L-cysteine = DNA (without 4-O-methylthymine) + protein S-methyl-L-cysteine
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DNA (containing 6-O-methylguanine) + protein L-cysteine = DNA (without 6-O-methylguanine) + protein S-methyl-L-cysteine
show the reaction diagram
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