6-tetradeoxy-beta-D-threo-hexopyranose) is a highly deoxygenated sugar component of several important natural products, including the potent yet environmentally benign insecticide spinosyns. To study D-forosamine biosynthesis, the five genes (spnO, N, Q, R, and S) from the spinosyn gene cluster thought to be involved in the conversion of TDP-4-keto-6-deoxy-D-glucose to TDP-D-forosamine were cloned and heterologously
Forosamine (4-
二甲氨基)-2,3,4,6-tetradeoxy-beta-D-threo-hexopyranose) 是几种重要
天然产物的高度脱氧糖成分,包括强效但对环境无害的
杀虫剂多杀菌素。为了研究 D-forosamine
生物合成,来自
多杀菌素基因簇的五个
基因(spnO、N、Q、R 和 S)被认为参与了 TDP-4-keto-6-deoxy-
D-葡萄糖向 TDP 的转化-D-forosamine 被克隆并异源表达,相应的蛋白质被纯化并在体外检查它们的活性。先前的工作表明,SpnQ 作为一种依赖于 5'-单
磷酸酯 (
PMP) 的 3-脱
水酶,在细胞还原酶对
铁氧还蛋白/
铁氧还蛋白还原酶或黄素氧还蛋白/黄素氧还蛋白还原酶存在的情况下,催化 TDP-4 的 C-3 脱氧-keto-2,6-dideoxy-
D-葡萄糖。还确定 SpnR 作为转
氨酶发挥作用,将 SpnQ 产物 TDP-4-keto-2