Abstract
A hybrid (prokaryotic-eukaryotic) enzyme system leading to the production of benzypenicillin has been developed. In vitro synthesis of penicillin G was achieved by incubating 6-aminopenicillanic acid, CoA, phenylacetic acid, homogenously pure phenylacetyl-CoA ligase (PA-CoA ligase) from Pseudomonas putida and acyl-CoA:6-APA acyltransferase (AT) from Penicillium chrysogenum. Benzylpenicillin was also obtained when AT was coupled with PA-CoA ligase and isopenicillin N-synthetase (IPNS). This is the first description of an in vitro assay that, using enzymes of different microbial origin, mimics the three last enzymatic steps leading to the biosynthesis of penicillin G in P. chrysogenum.
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