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Stress-induced premature senescence (SIPS) has been implicated in the suppression of carcinogenesis. We identified chromodomain protein 8 (CBX8), a Polycomb group (PcG) protein, as a novel binding partner of SIRT1. The interaction between CBX8 and SIRT1 was demonstrated by immunoprecipitation, GST pull-down, fluorescence microscopy, and cooperation for transcriptional repression. Like SIRT1, CBX8...
NAD + -dependent Class III histone deacetylase SIRT1 is a multiple function protein critically involved in stress responses, cellular metabolism and aging through deacetylating a variety of substrates including p53, forkhead-box transcription factors, PGC-1α, NF-κB, Ku70 and histones. The first discovered non-histone target of SIRT1, p53, is suggested to play a central role in SIRT1-mediated...
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