Bifunctional transcriptional activator/DNA repair enzyme Ada

UniProtKB accession:  P06134

Grouped By:  Matching UniProtKB accession

UniProtKB description:  Involved in the adaptive response to alkylation damage in DNA caused by alkylating agents. Repairs O6-methylguanine (O6-MeG) and O4-methylthymine (O4-MeT) in DNA. Repairs the methylated nucleobase in DNA by stoichiometrically transferring the methyl group to a cysteine residue in the enzyme (Cys-321). Also specifically repairs the Sp diastereomer of DNA methylphosphotriester lesions by the same mechanism, although the methyl transfer occurs onto a different cysteine residue (Cys-38). Cannot demethylate the other diastereomer, Rp-methylphosphotriester. This is a suicide reaction: the enzyme is irreversibly inactivated.