Bioconversion and biosynthesis of 16-membered macrolide antibiotics. XXII. Biosynthesis of tylosin after protylonolide formation.
作者:SATOSHI OMURA、NORIAKI SADAKANE、HAJIME MATSUBARA
DOI:10.1248/cpb.30.223
日期:——
In order to clarify the later stages of tylosin biosynthesis, the biotransformation of tylosin-related compounds to tylosin was examined in a tylosin-producing strain, Streptomyces fradiae KA-427, with the aid of cerulenin, which is an inhibitor of fatty acid and polyketide biosynthesis. Protylonolide (9), 5-O-mycaminosylprotylonolide (11), deepoxycirramycin A1 (12), 20-deoxy-5-O-mycaminosylrelonolide (13), 5-O-mycaminosyltylonolide (3) and demycarosyltylosin (2) were bioconverted to tylosin. However, 23-hydroxyprotylonolide (10), 20-deoxydemycarosylrelomycin (14) and 20-deoxy-23-O-mycinosylrelonolide (16) were bioconverted not to tylosin, but to 20-deoxyrelomycin (15). Thus, the biosynthetic pathway via compounds 11 and 3 is proposed.
为了阐明泰乐菌素生物合成的后期阶段,在一种脂肪酸和聚酮化合物抑制剂浅蓝菌素的帮助下,在泰乐菌素生产菌株弗氏链霉菌 KA-427 中检测了泰乐菌素相关化合物向泰乐菌素的生物转化。生物合成。 Protylonolide (9)、5-O-mycaminosyltylonolide (11)、深氧西拉霉素 A1 (12)、20-脱氧-5-O-mycaminosylrelonolide (13)、5-O-mycaminosyltylonolide (3) 和 demycarosyltylosin (2) 生物转化为泰乐菌素。然而,23-羟基丙酰诺内酯 (10)、20-脱氧脱氧雷洛霉素 (14) 和 20-脱氧-23-O-霉烯糖基雷洛霉素 (16) 并未生物转化为泰乐菌素,而是转化为 20-脱氧雷霉素 (15)。因此,提出了通过化合物11和3的生物合成途径。