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8-Oxoguanine DNA glycosylase (OGG1) is the major cellular enzyme required for the excision of 8-oxoguanine DNA base lesions in DNA through the base excision repair (BER) pathway, and therefore plays a major role in suppressing mutagenesis and in controlling genome stability. However, the mechanism of regulation of cellular OGG1 protein, particularly in response to oxidative stress, is unclear. We have purified the major E3 ubiquitin ligase responsible for OGG1 ubiquitylation from human cell extracts, and identify this as E3 ubiquitin-p