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Uracil-DNA glycosylase (UDG) is a critical DNA repair enzyme that is well conserved and ubiquitous in nearly all life forms. UDG protects genomic information integrity by catalyzing the excision from DNA of uracil nucleobases resulting from misincorporation or spontaneous cytosine deamination. UDG-mediated strand cleavage is also an important tool in molecular biotechnology, allowing for controlled and location-specific cleavage of single- and double DNA chemically or enzymatically synthesized with single or multiple incorporations of deoxyuridine. Although the cleavage mechanism is well-understood, detailed knowledge of efficiency and sequence specificity, in both single and double-stranded DNA contexts, has so far remained incomplete. Here we use an experimental approach based on the large-scale photolithographic synthesis of uracil-containing DNA oligonucleotides to comprehensively probe the context-dependent uracil excision efficiency of UDG.

Specificity and Efficiency of the Uracil DNA Glycosylase-Mediated Strand Cleavage Surveyed on Large Sequence Libraries