δ -(L-α-Aminoadipyl)-L-cysteinyl-D-valine synthetase (ACV synthetase): a multifunctional enzyme with broad substrate specificity for the synthesis of penicillin and cephalosporin precursors
Peculiar Stability of Amino Acids and Peptides from a Radical Perspective
作者:Zachary I. Watts、Christopher J. Easton
DOI:10.1021/ja9027583
日期:2009.8.19
Photochemical reactions of free and N-acetyl alpha-amino acids with chlorine and deuterium labeled hydrogen peroxide have been used to determine both the relative rates of reaction of molecules of these classes and the relative reactivity of their different types of hydrogen toward abstraction by chlorine and oxygen centered radicals. The relative rates of reaction of these species range over more than 3 orders
Penicillin biosynthesis: direct biosynthetic formation of penicillin V and penicillin G
作者:Jack E. Baldwin、Edward P. Abraham、Geoffrey L. Burge、Hong-Hoi Ting
DOI:10.1039/c39850001808
日期:——
The enzyme isopenicillin N synthetase is able to convert directly the dipeptides, phenoxyacetylcysteinylvaline and phenylacetylcysteinylvaline into penicillin V and G respectively; these are however very slow compared with substrates of the α-aminoadipoyl or adipoylcysteinylvaline type.
The crystal structure of isopenicillin N synthase with δ-(l-α-aminoadipoyl)-l-cysteinyl-d-methionine reveals thioether coordination to iron
作者:Ian J. Clifton、Wei Ge、Robert M. Adlington、Jack E. Baldwin、Peter J. Rutledge
DOI:10.1016/j.abb.2011.09.014
日期:2011.12
IsopenicillinNsynthase (IPNS) catalyses cyclization of δ-(l-α-aminoadipoyl)-l-cysteinyl-d-valine (ACV) to isopenicillinN (IPN), the central step in penicillin biosynthesis. Previous studies have shown that IPNS turns over a wide range of substrate analogues in which the valine residue of its natural substrate is replaced with other amino acids. IPNS accepts and oxidizes numerous substrates that
Conversion of<sup>17</sup>O/<sup>18</sup>O-labelled δ-(<scp>L</scp>-α-aminoadipyl)–<scp>L</scp>-cycteinyl–<scp>D</scp>-valine into<sup>17</sup>O/<sup>18</sup>O-labelled isopenicillin N in a cell-free extract of C. acremonium
作者:Robert M. Adlington、Robin T. Aplin、Jack E. Baldwin、Leslie D. Field、Eeva-M. M. John、Edward P. Abraham、Robert L. White
DOI:10.1039/c39820000137
日期:——
δ-(L-α-Amino[1,1,6-17O/18O]-adipyl)-L-cysteiny-D-valine was converted into isopenicillin N in cell-free extracts of Cephalosporium acremonium with no loss of 17O/18O label as shown by 17O n.m.r. spectroscopy and mass spectrometry; incubation of unlabelled tripeptide in cell-free system containing 17O/18O-enriched water produced isopenicillin N with no incorporation of 17O/18O.
Direct<sup>1</sup>H n.m.r. observation of the cell-free conversion of δ-(<scp>L</scp>-α-aminoadipyl)-<scp>L</scp>-cysteinyl-<scp>D</scp>-valine and δ-(<scp>L</scp>-α-aminoadipyl)-<scp>L</scp>-cysteinyl-<scp>D</scp>-(–)-isoleucine into penicillins
作者:Gulam Bahadur、Jack E. Baldwin、Leslie D. Field、Eeva-M. M. Lehtonen、John J. Usher、Carlos A. Vallejo、Edward P. Abraham、Robert L. White
DOI:10.1039/c39810000917
日期:——
conversion of δ-(L-aminoadipyl)-L-cysteinyl-D-(–)-isoleucine (lb) into a penicillin (2b) was observed directly by 1Hn.m.r.spectroscopy and the thiazolidine ring formation was shown to occur with retention of stereochemistry at C-3 of the isoleucinyl residue by 1H nuclear Overhauser enhancement studies of the product penicillin in the deproteinated incubation mixture.
δ-(的无细胞转化大号-aminoadipyl) -大号-cysteinyl- d - ( - ) -异亮氨酸(磅)转换成青霉素(2B)通过直接观察到1个H NMR光谱和噻唑烷环形成显示出通过在脱蛋白的孵育混合物中对青霉素产品进行1 H核Overhauser增强研究,可以保留异亮氨酰残基C-3处的立体化学。