The biosynthesis of valclavan was investigated by feeding radiolabelle
d potential precursors to fermentations of Streptomyces antibioticus s
sp antibioticus Tu 1718. The preliminary results indicate that the pri
mary metabolic precursors of valclavam are L-valine, L-arginine. L-met
hionine and a 3-C pool metabolite and suggest a common biosynthetic or
igin for clavulanic acid and valclavam.