Effector that is released into the host cell and affects host immune responses. Acts as an acetyltransferase that acetylates lysine residues of host proteins. acetyl-CoA + L-lysyl-[protein] = CoA + H(+) + N(6)-acetyl-L-lysyl-[protein] Homohexamer; trimer of dimers. Belongs to the acetyltransferase Eis family. Extended N-terminus.