The role of molecular oxygen in clavulanic acid biosynthesis: evidence for a bacterial oxidative deamination
作者:Craig A. Townsend、Walter J. Krol
DOI:10.1039/c39880001234
日期:——
Growth of cultures of Streptomyces clavuligerus(ATCC 27064) in an 18O2-containing atmosphere resulted in efficient and equal incorporations of molecularoxygen into the oxazolidine ring and the allylic hydroxy group of clavulanicacid.
棒状链霉菌(ATCC 27064)的培养物在含有18 O 2的气氛中的生长导致分子氧有效且均等地掺入到恶唑烷环和棒酸的烯丙基羟基中。
Experiments and speculations on the role of oxidative cyclization chemistry in natural product biosynthesis
作者:Craig A Townsend、Amit Basak
DOI:10.1016/s0040-4020(01)81792-0
日期:——
3′-2H2]proclavaminic acid, (22) and (29) respectively, are described. These labeled substrates were incubated with clavaminate synthase, a key enzyme acting in the biosynthesis of the lactamase inhibitor clavulanicacid, in the presence of ferrous ion, α-ketoglutaric acid and molecularoxygen. The apparent oxidative cyclization/desaturation chemistry evident in the conversion of proclavaminic acid (8) to clavaminic
Probable Role of Clavaminic Acid as the Terminal Intermediate in the Common Pathway to Clavulanic Acid and the Antipodal Clavam Metabolites
作者:Laura A. Egan、Robert W. Busby、Dirk Iwata-Reuyl、Craig A. Townsend
DOI:10.1021/ja963107o
日期:1997.3.1
ornithine/arginine in the identical regiochemical sense in all of these natural products, and has established the common intermediacy of the monocyclic β-lactam proclavaminicacid (12) as well. In this paper the quite advanced bicyclic intermediate clavaminicacid (14) has been synthesized in doubly 13C-labeled form by preparative incubation of recombinant clavaminate synthase. The intact and equally efficient