Component of the NuA4 histone acetyltransferase complex which is involved in transcriptional activation of selected genes principally by acetylation of nucleosomal histone H4 and H2A. Component of the NuA4 histone acetyltransferase complex. Interacts with ARP4 and SWC4, and (via HSA domain) with TAF14 and TAF14B. A number of isoforms are produced. Expressed in leaves. Belongs to the EAF1 family.