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. 1995 Oct 10;92(21):9732–9736. doi: 10.1073/pnas.92.21.9732

Human white blood cells contain cyclobutyl pyrimidine dimer photolyase.

B M Sutherland 1, P V Bennett 1
PMCID: PMC40876  PMID: 7568207

Abstract

Although enzymatic photoreactivation of cyclobutyl pyrimidine dimers in DNA is present in almost all organisms, its presence in placental mammals is controversial. We tested human white blood cells for photolyase by using three defined DNAs (supercoiled pET-2, nonsupercoiled bacteriophage lambda, and a defined-sequence 287-bp oligonucleotide), two dimer-specific endonucleases (T4 endonuclease V and UV endonuclease from Micrococcus luteus), and three assay methods. We show that human white blood cells contain photolyase that can photorepair pyrimidine dimers in defined supercoiled and linear DNAs and in a 287-bp oligonucleotide and that human photolyase is active on genomic DNA in intact human cells.

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Selected References

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