DCTPP1 hydrolyzes deoxynucleoside triphosphates (dNTPs) to the corresponding nucleoside monophosphates. It has a strong preference for modified dCTP. DCTPP1s activity is highest with 5-iodo-dCTP, followed by 5-bromo-dCTP, unmodified dCTP, 5-methyl-dCTP and 5-chloro-dCTP. DCTPP1 also hydrolyzes 2-chloro-dATP and 2-hydroxy-dATP with lower efficiency, and has even lower activity with unmodified dATP, dTTP and dUTP (in vitro). DCTPP1 does not hydrolyze ATP, UTP, ITP, GTP, dADP, dCDP or dGTP. It may protect DNA or RNA against the incorporation of non-canonical nucleotide triphosphates. DCTPP1 may also protect cells against inappropriate methylation of CpG islands by DNA methyltransferases.
TMPY-03508
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