Structure Elucidation of Sch 20562, a Glucosidic Cyclic Dehydropeptide Lactone. The Major Component of W-10 Antifungal Antibiotic.
作者:ADRIANO AFONSO、FRANK HON、RAY BRAMBILLA
DOI:10.7164/antibiotics.52.383
日期:——
glucosidic cyclic dehydrononapeptide lactone 1 are: an N-terminal (D)-beta-hydroxymyristyl unit, three D-amino acid units, two (E)-alpha-aminocrotonyl units, and an O-alpha-D-glucosyl-N-methyl-L-allo-threonine unit. The structure determination of 1 utilized the selective cleavage of the dehydropeptide units by ozonolysis to form fragments that were sequenced by mass spectrometry. The stereochemistry of the
一种新型细菌,命名为Aeromonas sp.。W-10生产的抗生素W-10复合物由两个主要成分和几个次要成分组成。鉴于其有效的抗真菌活性,该复合物的两个主要成分Sch 20562(1)和Sch 20561(1a)具有生物学意义。本文介绍了用于Sch 20562结构1分配的化学降解研究。该糖苷环状脱氢九肽内酯1的一些结构特征值得注意:N端(D)-β-羟基肉豆蔻酰基单元,三个D-氨基酸单元,两个(E)-α-氨基巴豆酰基单元和一个O -α-D-葡糖基-N-甲基-L-苏氨酸单位。1的结构确定利用了通过臭氧分解法对脱氢肽单元的选择性裂解,以形成片段,并通过质谱法对其进行了测序。通过从片段的水解物中分离游离氨基酸来指定氨基酸单元的立体化学。通过核磁共振光谱和分子旋转数据确定了α-氨基巴豆酰基单元的立体化学和糖苷键。