Erythromycin biosynthesis: Exploiting the catalytic versatility of the modular polyketide synthase
作者:Guanglin Luo、Rembert Pieper、Angela Rosa、Chaitan Khosla、David E. Cane
DOI:10.1016/0968-0896(96)00096-x
日期:1996.7
recombinant modular polyketide synthase (PKS) in which the first two biosynthetic modules of the 6-deoxyerythronolide B synthase are linked to the thioesterase domain normally found at the C-terminus of DEBS 3. Incubation of DEBS 1 + TE with propionyl-CoA, methylamalonyl-CoA, and NADPH gives the triketide lactone (2R,3S,4S,5R)-2,4-dimethyl-3, 5-dihydroxy-n-heptanoic acid delta-lactone (2), the cyclized form of
DEBS 1 + TE是一种重组模块化聚酮化合物合酶(PKS),其中6-脱氧赤藓醇内酯B合酶的前两个生物合成模块与通常在DEBS 3 C端发现的硫酯酶结构域连接。与丙酰辅酶A,甲基丙二酰辅酶A和NADPH一起生成三酮内酯(2R,3S,4S,5R)-2,4-二甲基-3,5-二羟基-正庚酸δ-内酯(2) DEBS 1的正常三酮化合物链延长产物的形式。[2,3-13C2]-(2S,3R)-2-甲基-3-将羟基二戊酰基-NAC硫酯(3)(正常的二酮化合物链延长中间体的类似物)和(2RS)-甲基-丙二酰-CoA与DEBS 1 + TE孵育,导致形成预测的标记三酮酮酮内酯[4,5-13C2] -8,通过13C NMR分析和与合成8的光谱比较确定。这种立体选择性转化说明了使用模块化PKS作为酶催化多功能催化剂的潜力合成新型聚酮化合物。