Abstract
8-Oxoguanine glycosylase 1 (OGG1) repairs the major oxidative DNA damage, 8-oxo-2'-deoxyguanosine. It has been reported that OGG1 incises the most frequently formed DNA lesion, apurinic/apyrimidinic (AP) site, and in the process a stable DNA-OGG1 cross-link is formed. However, the chemical structure of the adduct is not characterized. Here, we report that DNA-OGG1 cross-links result from cysteine and histidine addition to incised AP sites at 3'-DNA termini.
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