Histone chaperone-dependent acetylase that modifies 'Lys-56' of histone H3 (H3K56ac) (PubMed:33823938). Histone H3 'Lys-56' acetylation may be required for S-phase-linked DNA damage tolerance (By similarity). Also acetylates 'Lys-9' of histone H3 (H3K9ac) (PubMed:33823938). Autoacetylates (By similarity). acetyl-CoA + L-lysyl-[protein] = CoA + H(+) + N(6)-acetyl-L-lysyl-[protein] acetyl-CoA + L-lysyl-[histone] = CoA + H(+) + N(6)-acetyl-L-lysyl-[histone] Severely decreases acetylation of 'Lys-56' and 'Lys-9' of histone H3 (PubMed:33823938). Increases mycelial branching (PubMed:33823938). Severely decreases spore formation and abolishes sclerotia production (PubMed:33823938). Decreases aflatoxin production (PubMed:33823938). Increases sensitivity to sodium chloride (osmotic stress), hydrogen peroxide (oxidative stress), methyl methane sulfonate (genotoxic stress), and Congo Red (cell wall stress) (PubMed:33823938). Decreases cell population growth rate (PubMed:33823938). Decreases virulence on maize seed (PubMed:33823938). Belongs to the RTT109 family.