Acetylates spermine and probably also other polyamines such as putrescine or spermidine. May regulate the levels of polyamines on chromosomal DNA, which would modify chromatin structure and affect transcription or replication. Also able to acetylate arylalkylamines such as tryptamine and serotonin in vitro. Present with 8680 molecules/cell in log phase SD medium. Belongs to the acetyltransferase family. AANAT subfamily.