Histone acetyltransferase which may be involved in both positive and negative regulation of transcription. Required for RUNX2- dependent transcriptional activation. May be involved in cerebral cortex development. Component of the MOZ/MORF complex which has a histone H3 acetyltransferase activity. {ECO:0000269|PubMed:10497217, ECO:0000269|PubMed:11965546, ECO:0000269|PubMed:16387653}. This is the function of ENSG00000156650 (KAT6B, lysine acetyltransferase 6B).