Component of the HBO1 complex, which specifically mediates acetylation of histone H3 at 'Lys-14' (H3K14ac) and, to a lower extent, acetylation of histone H4 (PubMed:24065767). Component of the MOZ/MORF complex which has a histone H3 acetyltransferase activity (PubMed:16387653). Through chromatin acetylation it may regulate DNA replication and may function as a transcriptional coactivator (PubMed:12750254, PubMed:16387653). Inhibits cell growth, induces a delay in S-phase progression and enhances Fas-induced apoptosis in an INCA1-dependent manner (PubMed:21750715). {ECO:0000269|PubMed:12750254, ECO:0000269|PubMed:16387653, ECO:0000269|PubMed:21750715, ECO:0000269|PubMed:24065767}. This is the function of ING5 (inhibitor of growth family member 5, ENSG00000168395).