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We report on a novel activity of T4 endonuclease V. This enzyme is well known to be specific for the excision of pyrimidine dimers from UV-irradiated DNA. In this work, we show that T4 endonuclease V excises 4,6-diamino-5-formamidopyrimidine from DNA. 4,6-Diamino-5-formamidopyrimidine is formed as a product of adenine in DNA upon action of hydroxyl radicals and upon UV-irradiation. DNA substrates...
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