Investigating the Initial Steps in the Biosynthesis of Cyanobacterial Sunscreen Scytonemin
作者:Emily P. Balskus、Christopher T. Walsh
DOI:10.1021/ja807192u
日期:2008.11.19
(1) functions as a sunscreen, absorbing harmful UV-A radiation. Using information from a recently identified gene cluster, we propose a biosynthetic route to this pigment. We also report the characterization of two enzymes, NpR1275 and NpR1276, which are involved in the initial stages of this pathway. A regioselective acyloin reaction between indole-3-pyruvic acid (4) and p-hydroxyphenylpyruvic acid
蓝藻天然产物 scytonemin (1) 起到防晒作用,吸收有害的 UV-A 辐射。使用来自最近确定的基因簇的信息,我们提出了该色素的生物合成途径。我们还报告了参与该途径初始阶段的两种酶 NpR1275 和 NpR1276 的表征。吲哚-3-丙酮酸 (4) 和对羟基苯基丙酮酸 (5) 之间的区域选择性 acyloin 反应是组装所提出的单体 scytonemin 前体 (2) 的碳框架的关键步骤。