The Interaction of Isopenicillin N Synthase with Homologated Substrate Analogues δ-(<scp>L</scp>-α-Aminoadipoyl)-<scp>L</scp>-homocysteinyl-<scp>D</scp>-Xaa Characterised by Protein Crystallography
作者:Adam Daruzzaman、Ian J. Clifton、Robert M. Adlington、Jack E. Baldwin、Peter J. Rutledge
DOI:10.1002/cbic.201200728
日期:2013.3.18
Loose fit: IPNS catalyses the central step in penicillin biosynthesis. Substrate analogues containing L‐homocysteine in place of the natural substrate's L‐cysteine residue are not converted into bicyclic products. Crystal structures for IPNS complexes with two such analogues reveal that the additional CH2 unit affords considerable conformational freedom when these analogues bind to IPNS.
γ-Lactam formation from tripeptides with isopenicillin N synthase
作者:Jack E. Baldwin、William J. Norris、Richard T. Freeman、Mark Bradley、Robert M. Adlington、Sadie Long-Fox、Christopher J. Schofield
DOI:10.1039/c39880001128
日期:——
Incubation of isopenicillinNsynthase (IPNS) with analogues of the natural substrate [(5S)-5-amino-5-carboxypentanoyl]-L-cysteinyl-D-valine (2) in which the cysteinyl residue was replaced by homocysteine gave epimeric 5-hydroxy γ-lactams (10), with no evidence for the formation of bicyclic products.