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• W2338151994 abstract "The biosynthesis of penicillin and cephalosporin antibiotics in microorganisms requires the formation of the bicyclic nucleus of penicillin. Isopenicillin N synthase (IPNS), a non-haem iron-dependent oxidase, catalyses the reaction of a tripeptide, delta-(L-alpha-aminoadipoyl)-L-cysteinyl-D-valine (ACV), and dioxygen to form isopenicillin N and two water molecules. Mechanistic studies suggest the reaction is initiated by ligation of the substrate thiolate to the iron centre, and proceeds through an enzyme-bound monocyclic intermediate. Here we report the crystal structure of IPNS complexed to ferrous iron and ACV, determined to 1.3 A resolution. Based on the structure, we propose a mechanism for penicillin formation that involves ligation of ACV to the iron centre, creating a vacant iron coordination site into which dioxygen can bind. Subsequently, iron-dioxygen and iron-oxo species remove the requisite hydrogens from ACV without the direct assistance of protein residues. The crystal structure of the complex with the dioxygen analogue, NO and ACV bound to the active-site iron supports this hypothesis." @default.
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• W2338151994 date "1997-06-01" @default.
• W2338151994 modified "2023-10-17" @default.
• W2338151994 title "Structure of isopenicillinN synthase complexed with substrate and the mechanism ofpenicillin formation" @default.
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• W2338151994 doi "https://doi.org/10.1038/42990" @default.
• W2338151994 hasPubMedId "https://pubmed.ncbi.nlm.nih.gov/9194566" @default.
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