Oxidative Phenol Coupling Reactions Catalyzed by OxyB: A Cytochrome P450 from the Vancomycin Producing Organism. Implications for Vancomycin Biosynthesis
作者:Katharina Woithe、Nina Geib、Katja Zerbe、Dong Bo Li、Markus Heck、Severine Fournier-Rousset、Odile Meyer、Francesca Vitali、Nobuatsu Matoba、Khaled Abou-Hadeed、John A. Robinson
DOI:10.1021/ja071038f
日期:2007.5.1
OxyB is a cytochromeP450 enzyme that catalyzes the first phenolcouplingreaction during the biosynthesis of vancomycin-like glycopeptide antibiotics. The phenolcouplingreaction occurs on a linear peptide intermediate linked as a C-terminal thioester to a peptide carrier protein (PCP) domain within the multidomain glycopeptide nonribosomal peptide synthetase (NRPS). Using model peptides with the
A general enantioselective O-2-isocephem synthesis
作者:Harold Mastalerz、Vivianne Vinet
DOI:10.1039/c39870001283
日期:——
A simple procedure for the conversion of the readily available chiral azetidinone (2) into the O-2-isocephem (5) is described.
描述了用于将容易获得的手性氮杂环丁酮(2)转化为O-2-异头孢烯(5)的简单程序。
Substituent Effects on the Phenol Coupling Reaction Catalyzed by the Vancomycin Biosynthetic P450 Enzyme OxyB
作者:Patrick C. Schmartz、Katharina Wölfel、Katja Zerbe、Emad Gad、El Sayed El Tamany、Hassen K. Ibrahim、Khaled Abou-Hadeed、John A. Robinson
DOI:10.1002/anie.201204458
日期:2012.11.12
Oxidativephenolcouplingreactions are required to establish the cross‐linked heptapeptide backbone of vancomycin. The first cross‐linking reaction, catalyzed by the P450 enzyme OxyB, is dramatically slower when a chlorine substituent is present in the hexapeptide‐S‐PCP substrate and is abolished when chlorine is introduced into a potential heptapeptide‐S‐PCP substrate.
The synthesis and structure-activity relationships of a series of orally absorbed O-2-isocephems are described. These compounds possessed a D-[(p-hydroxyphenyl)glycyl]amino substituent at the 7-position while the substituent at the 3-position was varied. Relative to the analogous cephems, the O-2-isocephems exhibited comparable to better activity against Gram-positive organisms. Against Gram-negative organisms, their activity was variable but did indicate a lower beta-lactamase stability. Following oral administration, the O-2-isocephems generally exhibited longer half-lives but lower Cmax's and urinary recoveries.