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Hoffmann, R. A wiki for the life sciences where authorship matters. Nature Genetics (2008)

5' to 3' single strand DNA exonuclease activity in a preparation of human Ku protein.

We describe a novel 5' to 3' single-strand exonuclease activity exhibited by a Ku preparation purified from a human cell line. The enzyme removes 5' single-strand extensions from duplex DNA molecules. The exonuclease and helicase activities respond reciprocally to changes in ATP concentrations: Nuclease activity is inhibited at the ATP concentrations that are optimal for the helicase. The exonuclease activity does not require divalent cations. The potential implications of the exonuclease activity findings for repair of double-strand breaks and recombination processes are discussed.[1]


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