Penicillin biosynthesis. Dual pathways from a modified substrate

Abstract
Preparations of the enzyme isopenicillin N synthetase from Cephalosporium acremonium convert the modified substrate (L-α-amino-δ-adipyl)-L-cysteinyl-D-(α-aminobutyrate) into both penam and cepham products, which have been isolated and their structures established.

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