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Uracil DNA glycosylase family 6, includes hypoxanthine-DNA glycosylase and similar proteins Uracil DNA glycosylase family 6 hypoxanthine-DNA glycosylase (HDG) lacks any detectable UDG activity; it excises hypoxanthine, a deamination product of adenine, from double-stranded DNA. Uracil-DNA glycosylase (UDGs) initiates repair of uracils in DNA. Uracil in DNA can arise as a result of misincorporation of dUMP residues by DNA polymerase or via deamination of cytosine. Uracil in DNA mispaired with guanine is one of the major pro-mutagenic events, causing G:C->A:T mutations. Thus, UDG is an essential enzyme for maintaining the integrity of genetic information. UDGs have been classified into various families on the basis of their substrate specificity, conserved motifs, and structural similarities. Although these families demonstrate different substrate specificities, often the function of one enzyme can be complemented by the other.
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Jiyao W et al.(2023). "The conserved domain database in 2023.",