This protein is a multifunctional enzyme, able to activate and polymerize the amino acids Pro, Gln and Tyr as part of the biosynthesis of the lipopeptide antibiotic plipastatin. The Tyr residue is further epimerized to the D-isomer form. The activation sites for these amino acids consist of individual domains. Binds 3 phosphopantetheines covalently. Belongs to the ATP-dependent AMP-binding enzyme family.