Component of the NuA4 histone acetyltransferase complex which is involved in transcriptional activation of select genes principally by acetylation of nucleosomal histone H4 and H2A (PubMed:14966270). This modification may both alter nucleosome - DNA interactions and promote interaction of the modified histones with other proteins which positively regulate transcription (PubMed:14966270). Component of HBO1 complexes, which specifically mediate acetylation of histone H3 at 'Lys-14' (H3K14ac), and have reduced activity toward histone H4 (PubMed:16387653, PubMed:24065767). Component of the MOZ/MORF complex which has a histone H3 acetyltransferase activity (PubMed:18794358). {ECO:0000269|PubMed:14966270, ECO:0000269|PubMed:16387653, ECO:0000269|PubMed:18794358, ECO:0000269|PubMed:24065767}. This is the function of MEAF6 (MYST/Esa1 associated factor 6, ENSG00000163875).