Involved in the biosynthesis of 2-methyl-3-n-amyl-pyrrole (MAP), one of the terminal products involved in the biosynthesis of the red antibiotic prodigiosin (Pig). Catalyzes the transamination to the aldehyde group of 3-acetyloctanal, resulting in an aminoketone, which spontaneously cyclizes to yield the dihydro form of MAP (H2MAP). Antibiotic biosynthesis; prodigiosin biosynthesis. Homodimer. Belongs to the class-III pyridoxal-phosphate-dependent aminotransferase family.