Biosynthesis of PD 116740: origins of the carbon, hydrogen, and oxygen atoms and derivation from a 6-deoxybenz[a]anthraquinone
作者:Steven J. Gould、Xingchun Cheng、Chris Melville
DOI:10.1021/ja00084a022
日期:1994.3
folded in a manner to generate the angular tetracyclic skeleton. The 6-deoxybenz(a)anthraquinone tetrangulol is an intermediate, indicating that 6-deoxygenation occurs at a prearomatic stage in the biosynthesis. This was consistent with the lack of incorporation of acetate-derived oxygen at this site. Labelling of the C-5 hydroxyl by molecular oxygen indicates that enzymatic epoxidation of the K-region
苯并 (a) 蒽醌抗生素 PD 116740 是由 decaketide 中间体的规则环化形成的,以生成角四环骨架的方式折叠。6-deoxybenz(a)anthraquinone tetrangulol 是一种中间体,表明 6-deoxygenation 发生在生物合成的前芳香阶段。这与该位点未掺入醋酸盐衍生的氧是一致的。分子氧对 C-5 羟基的标记表明 K 区双键的酶促环氧化,然后是环氧化物水解酶的作用,生成 5,6-fran.r-二醇部分。