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. Cells lacking this gene show a white phenotype and produce 4-hydroxy-2,2'-bipyrrole-5-carbaldehyde (HBC), 4- methoxy-2,2'-bipyrrole-5-carbaldehyde (MBC) and 4-hydroxy-2,2'-bipyrrole-5-methanol (HBM). Belongs to the class-III pyridoxal-phosphate-dependent aminotransferase family.