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. 1986 Jun;6(6):1983–1990. doi: 10.1128/mcb.6.6.1983

Substrate specificity of a mammalian DNA repair endonuclease that recognizes oxidative base damage.

D E Helland, P W Doetsch, W A Haseltine
PMCID: PMC367737  PMID: 3537712

Abstract

The substrate specificity of a calf thymus endonuclease on DNA damaged by UV ligh, ionizing radiation, and oxidizing agents was investigated. End-labeled DNA fragments of defined sequence were used as substrates, and the enzyme-generated scission products were analyzed by using DNA sequencing methodologies. The enzyme was shown to incise damaged DNA at pyrimidine sites. The enzyme incised DNA damaged with UV light, ionizing radiation, osmium tetroxide, potassium permanganate, and hydrogen peroxide at cytosine and thymine sites. The substrate specificity of the calf thymus endonuclease was compared to that of Escherichia coli endonuclease III. Similar pyrimidine base damage specificities were found for both enzymes. These results define a highly conserved class of enzymes present in both procaryotes and eucaryotes that may mediate an important role in the repair of oxidative DNA damage.

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Selected References

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