Abstract
A two-step enzymatic mechanism for the incision of UV-irradiated DNA at pyrimidine dim ers (PD) by the “UV endonuclease” activity from M. luteus has recently been proposed (1–3). This mechanism is related to the classical base excision repair mode (4), since it consists of the sequential action of a PD-specific DNA glycosylase and an apurinic/apyrimidinic (AP) endonuclease. Such a two-step mechanism was interesting to us for the relevance it might have to our continuing investigations of the repair of UV-irradiated DNA in a variety of biological systems.
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