dATP(dGTP)—DNA purinetransferase () is an enzyme with systematic name dATP(dGTP):depurinated-DNA purine transferase. This enzyme catalyses the following chemical reaction
(1) dATP + depurinated DNA deoxyribose triphosphate + DNA (2) dGTP + depurinated DNA deoxyribose triphosphate + DNA
The purine residue is transferred on to the apurinic site forming a normal glycosylic bond.
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