THE OPTIMIZATION OF PENICILLIN BIOSYNTHESIS IN FUNGI

Penicillin production by Penicillium chrysogenum is not only commercia lly important but arguably the most intensively investigated secondary -metabolic pathway in fungi. Isolation of the structural genes encodin g the three main penicillin-biosynthetic enzymes has stimulated the us e of molecular approaches to optimize yield and permitted genetic anal ysis of current production strains, which are themselves the products of 50 years of strain and process improvement. Parallel studies on the penicillin-producing genetic model organism Aspergillus nidulans are now addressing questions about the genetic regulation of primary and s econdary metabolism, the compartmentalization of biosynthesis and the excretion of the end products.