Component of the clr6 histone deacetylase complex I' responsible for the deacetylation of lysine residues on the N-terminal part of the core histones (H2A, H2B, H3 and H4). Histone deacetylation gives a tag for epigenetic repression and plays an important role in transcriptional regulation, cell cycle progression and developmental events. Has a role in silencing of mating type genes. Interacts with H3K4me3 and to a lesser extent with H3K4me2 (By similarity). Component of the clr6 histone deacetylase complex I'composed of at least clr6, png2, prw1, pst1 and sds3. The PHD-type zinc finger mediates the binding to H3K4me3. Belongs to the ING family.