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. Expressed in leaves. Decreased expression of EAF1A leads to decreased levels of H4K5 acetylation in the promoter region of major flowering regulator genes, decreased FLC expression and early flowering. Belongs to the EAF1 family.