Crystal structure of isopenicillin N synthase is the first from a new structural family of enzymes.Roach, P.L., Clifton, I.J., Fulop, V., Harlos, K., Barton, G.J., Hajdu, J., Andersson, I., Schofield, C.J., Baldwin, J.E.
(1995) Nature 375: 700-704
- PubMed: 7791906
- DOI: 10.1038/375700a0
- Structures With Same Primary Citation
- PubMed Abstract:
- Crystallization and Preliminary X-Ray Diffraction Studies on Recombinant Isopenicillin N Synthase from Aspergillus Nidulans
Roach, P.L., Schofield, C.J., Baldwin, J.E., Clifton, I.J., Hajdu, J.
(1995) Protein Sci 4: 1007
Penicillin antibiotics are all produced from fermentation-derived penicillins because their chemical synthesis is not commercially viable. The key step in penicillin biosynthesis, in which both the beta-lactam and thiazolidine rings of the nucleus ar ...
Penicillin antibiotics are all produced from fermentation-derived penicillins because their chemical synthesis is not commercially viable. The key step in penicillin biosynthesis, in which both the beta-lactam and thiazolidine rings of the nucleus are created, is mediated by isopenicillin N synthase (IPNS), which binds ferrous iron and uses dioxygen as a cosubstrate. In a unique enzymatic step, with no chemical precedent, IPNS catalyses the transfer of four hydrogen atoms from its tripeptide substrate to dioxygen forming, in a single reaction, the complete bicyclic nucleus of the penicillins. We now report the structure of IPNS complexed with manganese, which reveals the active site is unusually buried within a 'jelly-roll' motif and lined by hydrophobic residues, and suggest how this structure permits the process of penicillin formation. Sequence analyses indicate IPNS, 1-aminocyclopropane-1-carboxylic acid oxidase and many of the 2-oxo-acid-dependent oxygenases contain a conserved jelly-roll motif, forming a new structural family of enzymes.
Dyson Perrins Laboratory, University of Oxford, UK.