Catalytic activity:A 3'-phosphopolynucleotide + H (2) O = a polynucleotide + phosphate. ,Catalytic activity:ATP + 5'-dephospho-DNA = ADP + 5'-phospho-DNA. ,Function:Catalyzes the phosphorylation of DNA at 5'-hydroxyl termini and can dephosphorylate its 3'-phosphate termini. Plays an important function in DNA repair following ionizing radiation or oxidative damage. ,PTM:Phosphorylated upon DNA damage , probably by ATM or ATR. ,similarity:In the N-terminal section; belongs to the DNA 3' phosphatase family. ,tissue specificity:Expressed in many tissues with highest expression in spleen and testis , and lowest expression in small intestine (PubMed:10446192) . Expressed in higher amount in pancreas , heart and kidney and at lower levels in brain , lung and liver (PubMed:10446193) . ,
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