Penicillin biosynthesis: the origin of hydroxy groups in β-lactams derived from unsaturated substrates
作者:Jack E. Baldwin、Robert M. Adlington、Sabine L. Flitsch、Hong-Hoi Ting、Nicholas J. Turner
DOI:10.1039/c39860001305
日期:——
Two unsaturated peptide substrates were each cyclised by the enzyme isopenicillin N synthase (IPNS) from Cephalosporium acremonium CO 728 simultaneously to both desaturated and hydroxylated β-lactam products whose hydroxy groups have been shown to derive their oxygen atom from the cosubstrate dioxygen; a working hypothesis involving iron–oxo species is proposed to explain this phenomenon.
Penicillin biosynthesis: structure–reactivity profile of unsaturated substrates for isopenicillin N synthetase
作者:Jack E. Baldwin、Robert M. Adlington、Amit Basak、Sabine L. Flitsch、Andrew K. Forrest、Hong-Hoi Ting
DOI:10.1039/c39860000273
日期:——
A series of unsaturated tripeptides have been synthesised and evaluated as substrates for isopenicillinNsynthetase; variations in the C-terminal amino acid have led to a structure reactivity profile which indicates a stereochemical dependence on the balance between desaturative vs. hydroxylative ring closures.