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Endonuclease V is the product of the denV gene of bacteriophage T4 and is responsible for the recognition and repair of pyrimidine dimers due to UV irradiation of DNA. This is accomplished by a two-step mechanism involving incision at the site of the lesion followed by cleavage of the phosphate backbone. In order to better understand this molecule, and to validate our new mutagenesis procedure, we have constructed a series of random mutations within the region Ala116--&gt;Lys121 using a random targeted mutagenesis procedure developed for this study. The results presented here suggest an important role for this region in the stabilization of the thymine dimer-containing substrate. These mutants also confirm a direct correlation between survival and both DNA binding and pyrimidine dimer-DNA glycosylase activity. No such correlation exists between survival and AP lyase activity. The results are consistent with the recently published X-ray crystal structure.

Structure/function analysis of the Ala116← Lys121region of endonuclease V by random targeted mutagenesis

Structure/function analysis of the Ala¹¹⁶← Lys¹²¹region of endonuclease V by random targeted mutagenesis