GCN5: The members of Gcn5-related N-acetyltransferase (GNAT) family structurally resemble the archetypal HAT Gcn5 and have been relatively well studied. They share the highly conserved catalytic HAT domain with characteristic sequence motifs, of which motif A notably binds acetyl-coA. Some members additionally have an N-terminal PCAF homology domain for substrate selectivity and a C-terminal bromodomain for binding acetylated lysine residues. As is the case with most HATs, GCN5 functions as the catalytic component in multi-subunit complexes SAGA, ADA and SLIK, playing important roles in transcriptional activation and various chromatin activities (1)

Reference
1. Jeon J. H., Lee Y. H.Histone acetylation in fungal pathogens of plants. Plant Pathol.J.2014;30(1):1-9. PMID: 25288980.