Structural Determination of Stevastelins, Novel Depsipeptides from Penicillium sp.
作者:TOMIO MORINO、KEI-ICHI SHIMADA、AKIRA MASUDA、NORIYUKI YAMASHITA、MASAKAZU NISHIMOTO、TAKAAKI NISHIKIORI、SEIICHI SAITO
DOI:10.7164/antibiotics.49.564
日期:——
Structures of novel immunosuppressants, stevastelin A, B and B31) were determined by their spectroscopic and chemical studies. Three stevastelins were shown to be cyclic depsipeptides composed of a fatty acid and three amino acid moieties. The sequence of these moieties was determined to be as 3, 5-dihydroxy-2, 4-dimethylstearylvalylthreonyl (or O-sulfonylthreonyl in stevastelin A)-O-acetylserine. Cyclic structures were shown to be formed by ester linkages between the carboxylic group of the O-acetylserine moiety and the 5-hydroxy group of the fatty acid moiety in stevastelin A and B, and the 3-hydroxy group of the fatty acid moiety in stevastelin B3.
通过光谱和化学研究确定了新型免疫抑制剂--甜菊素 A、B 和 B31)的结构。研究表明,三种硬脂皂苷是由一个脂肪酸和三个氨基酸分子组成的环状去肽。这些氨基酸的序列被确定为 3,5-二羟基-2,4-二甲基硬脂酰缬氨酰苏氨酰(或在硬脂皂苷 A 中为 O-磺酰苏氨酰)-O-乙酰丝氨酸。环状结构由 O-乙酰丝氨酸分子的羧基与硬脂皂苷 A 和 B 中脂肪酸分子的 5-羟基以及硬脂皂苷 B3 中脂肪酸分子的 3-羟基之间的酯连接形成。