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Additionally, INGs may be able to recruit their associated histone-modifying activities directly to chromatin. Both ING3 and its S. cerevisiae orthologue Yng2 are necessary to enable human or yeast piccolo NuA4 to acetylate chromatin substrates in vitro (Boudreault et al. , 2003; Doyon et al. , 2004), suggesting that in each case the ING protein is responsible for the initial binding to chromatin. More recently, the ING PHD finger was shown to specifically bind histone H3 trimethylated on lysine 4 (H3K4me3) – a mark deposited by the mixed lineage leukaemia (MLL) methyltransferase and associated with high transcription levels.
Chromatin modifying enzymes, organism-specific biosystemEukaryotic DNA is associated with histone proteins and organized into a complex nucleoprotein structure called chromatin. This structure decreases the accessibility of DNA but also helps to protect i.