Probably involved in some intermediate steps for the synthesis of the antibiotic polyketide bacillaene which is involved in secondary metabolism. Probably has an acyl transferase activity and could also have a flavin mononucleotide-dependent oxidoreductase activity. holo-[ACP] + malonyl-CoA = CoA + malonyl-[ACP] Antibiotic biosynthesis; bacillaene biosynthesis. In the N-terminal section; belongs to the FabD family.