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- W2011068146 abstract "Reductive methylation and site-directed mutagenesis experiments have implicated the N-terminal alpha-amino group of T4 endonuclease V in the glycosylase and abasic lyase activities of the enzyme. NMR studies have confirmed the involvement of the N-terminal alpha-amino group in the inhibition of enzyme activity by reductive methylation. A mechanism accounting for these results predicts that a (imino) covalent enzyme-substrate intermediate is formed between the protein N-terminal alpha-amino group and C1' of the 5'-deoxyribose of the pyrimidine dimer substrate subsequent to (or concomitantly with) the glycosylase step. Experiments to verify the existence of this intermediate indicated that enzyme inhibition by cyanide was substrate-dependent, a result classically interpreted to imply an imino reaction intermediate. In addition, sodium borohydride reduction of the intermediate formed a stable dead-end enzyme-substrate product. This product was formed whether ultraviolet light-irradiated high molecular weight DNA or duplex oligonucleotides containing a defined thymine-thymine cyclobutane dimer were used as substrate. The duplex oligonucleotide substrates demonstrated a well-defined gel shift. This will facilitate high-resolution footprinting of the enzyme on the DNA substrate." @default.
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- W2011068146 title "Evidence for an imino intermediate in the T4 endonuclease V reaction" @default.
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- W2011068146 doi "https://doi.org/10.1021/bi00083a032" @default.
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