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A novel site-specific cytosine DNA glycosylase has been rationally engineered from the active site scaffold of the DNA repair enzyme uracil DNA glycosylase (UDG). UDG, which operates by a nucleotide flipping mechanism, was first converted into a sequence nonspecific cytosine DNA glycosylase (CDG) by altering the base-specific hydrogen bond donor-acceptor groups in the active site. A second mutation...
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