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Alkyladenine DNA glycosylase catalyzes the first step in base excision repair Alkyladenine DNA glycosylase (AAG), also known as 3-methyladenine DNA glycosylase, catalyzes the first step in base excision repair (BER) by cleaving damaged DNA bases within double-stranded DNA to produce an abasic site. AAG bends DNA by intercalating between the base pairs, causing the damaged base to flip out of the double helix and into the enzyme active site for cleavage. Although AAG represents one of six DNA glycosylase classes, it lacks the helix-hairpin-helix active site motif associated with other BER glycosylases and is structurally distinct from them.
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Jiyao W et al.(2023). "The conserved domain database in 2023.",