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AlkB is an alpha-ketoglutarate- and Fe(II)-dependent dioxygenase that oxidizes the relevant methyl groups and releases them as formaldehyde. The human homologs of both these enzymes remove 1-methyladenine and 3-methylcytosine from methylated polynucleotides in an alpha-ketoglutarate-dependent reaction. They act by direct damage reversal with the regeneration of the unsubstituted bases. E.coli AlkB, and human ABH2, and ABH3 can also repair 1-ethyladenine residues in DNA with the release of acetaldehyde (Duncan et al., 2002).
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ABH2 mediated Reversal of Alkylation Damage
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