Polytheonamides A and B, Highly Cytotoxic, Linear Polypeptides with Unprecedented Structural Features, from the Marine Sponge, <i>Theonella </i><i>s</i><i>winhoei</i>
作者:Toshiyuki Hamada、Shigeki Matsunaga、Gen Yano、Nobuhiro Fusetani
DOI:10.1021/ja045749e
日期:2005.1.1
Polytheonamides A and B are highly cytotoxic polypeptides with 48 amino acid residues isolated from the marine sponge, Theonella swinhoei. The structure of polytheonamide B was determined by spectral and chemical methods, especially extensive 2D NMR experiments, which resulted in the unprecedented polypeptide structure; the N-terminal glycine blocked with a 5,5-dimethyl-2-oxo-hexanoyl group, the presence
Polytheonamides A 和 B 是具有 48 个氨基酸残基的高细胞毒性多肽,从海绵海绵动物 Theonella swinhoei 中分离出来。Polytheonamide B 的结构是通过光谱和化学方法确定的,特别是广泛的 2D NMR 实验,导致了前所未有的多肽结构;N-末端甘氨酸被 5,5-二甲基-2-氧代-己酰基封闭,存在八个叔亮氨酸、三个 β-羟基缬氨酸、六个 γ-N-甲基天冬酰胺、两个 γ-N-甲基-β-羟基天冬酰胺和β,β-二甲硫氨酸亚砜残基。更重要的是,它具有交替的 D- 和 L- 氨基酸序列。Polytheonamide A 是polytheonamide B 的差向异构体,不同之处仅在于第 44(th) 个残基的亚砜的立体化学。