Incorporation of shikimic acid into corynecins and its regulation.

In the biosynthesis of corynecins by Corynebacterium hydrocarboclastus, it appeared that shikimic acid was one of the efficient precursors, where shikimic acid-U-14C was incorporated into corynecins in the yield of approximately 15%. Analyses of degradation products of labeled corynecins demonstrated that shikimic acid was incorporated specifically into aromatic ring of corynecins. The incorporation of shikimic acid was inhibited by several aromatic amines such as p-aminophenylserinol-N-propionamide, although the uptake of shikimic acid was not affected, suggesting that biosynthesis of corynecins might be regulated by p-aminophenyl intermediates. Furthermore, p-aminophenylethylalcohol was found to be a potent inhibitor of biosynthesis of corynecins. In contrast, corynecins and other p-nitro-phenyl derivatives, aromatic amino acids and vitamins related to shikimic acid pathway did not inhibit the biosynthesis of corynecins from shikimic acid.