Catalyzes the transfer of acetyl from acetyl-CoA to the N-hydroxylysine. Involved in the biosynthesis of the siderophore aerobactin which is a chelator that mediates the high-affinity iron transport systems induced under iron-stressed conditions. acetyl-CoA + N(6)-hydroxy-L-lysine = CoA + N(6)-acetyl-N(6)-hydroxy-L-lysine Optimum pH is 7. Optimum temperature is 40 degrees Celsius. Siderophore biosynthesis; aerobactin biosynthesis. Belongs to the IucB family.