In the chemical investigation of marine unicellular bacteria, a new peptide, thalassospiramide G (1), along with thalassospiramides A and D (2–3), was discovered from a large culture of Thalassospira sp. The structure of thalassospiramide G, bearing γ-amino acids, such as 4-amino-5-hydroxy-penta-2-enoic acid (AHPEA), 4-amino-3,5-dihydroxy-pentanoic acid (ADPA), and unique 2-amino-1-(1H-indol-3-yl) ethanone (AIEN), was determined via extensive spectroscopic analysis. The absolute configuration of thalassospiramide D (3), including 4-amino-3-hydroxy-5-phenylpentanoic acid (AHPPA), was rigorously determined by 1H–1H coupling constant analysis and chemical derivatization. Thalassospiramides A and D (2–3) inhibited nitric oxide (NO) production in lipopolysaccharide (LPS)-stimulated mouse macrophage RAW 264.7 cells, with IC50 values of 16.4 and 4.8 μM, respectively.
在对海洋单细胞细菌进行
化学研究的过程中,发现了一种新的
多肽--沙拉螺旋酰胺 G(1),以及沙拉螺旋酰胺 A 和 D(2-3),它们来自沙拉螺旋弧菌(ThalassospiRA sp.通过大量光谱分析,确定了含有γ-
氨基酸(如 4-
氨基-5-羟基五-2-烯酸(AH
PEA)、4-
氨基-3,5-二羟基
戊酸(
ADPA)和独特的 2-
氨基-1-(1H-
吲哚-3-基)乙酮(AIEN))的沙
拉索斯螺旋酰胺 G 的结构。通过 1H-1H 偶联常数分析和
化学衍生,严格确定了
硫磷酰胺 D(3)的绝对构型,包括 4-
氨基-3-羟基-
5-苯基戊酸(A
HPPA)。ThalassospiRAmides A 和 D(2-3)可抑制脂
多糖(LPS)刺激的小鼠巨噬细胞 RAW 264.7 中
一氧化氮(NO)的产生,其 IC50 值分别为 16.4 和 4.8 μM。