Urumamide, a novel cyclic depsipeptide that contains a β-aminoacid, was isolated from a marine cyanobacterium Okeania sp. Its gross structure was determined by spectroscopic analyses, and the absolute configuration was established based on Marfey’s analyses and chiral HPLC analyses of hydrolysis products. Biologically, urumamide inhibited the growth of human cancer cells. In addition, urumamide inhibited
Evolved Diversification of a Modular Natural Product Pathway: Apratoxins F and G, Two Cytotoxic Cyclic Depsipeptides from a Palmyra Collection of Lyngbya bouillonii
作者:Kevin Tidgewell、Niclas Engene、Tara Byrum、Joseph Media、Takayuki Doi、Fred A. Valeriote、William H. Gerwick
DOI:10.1002/cbic.201000070
日期:——
Tropical cytotoxin: A collection of LyngbyabouilloniifromPalmyra Atoll in the Central Pacific, a site several thousand kilometers distant from all previous collections of this chemically prolific species of cyanobacterium, was found to contain two new cancer cell cytotoxins of the apratoxin family.
From a mixed assemblage of Lyngbyamajuscula rich marine cyanobacteria, we isolated a series of cell growth inhibitory cyclic peptides. The structures of the two major components, laxaphycins A (1) and B (2), and of two minor peptides, laxaphycins B2 (3) and B3 (4), were determined by spectroscopic methods and degradative analysis. Absolute configurations of natural and nonproteinogenic amino acids
A novel tridecadepsipeptide, theonellamine B, has been isolated from an Okinawan marine sponge of the genus as a specific inhibitor against Na,K- ATPase. Its structure has been determined to be a lactone ofmethoxyacetyl--Val-- MeLeu--Thr-β-Ala--Leu--MeIle-β-Ala---Ile--MeVal--MeAla-β-Ala--Leu--- MeIle on the basis of chemical reaction and spectral data including two dimensional homo- and heteronuclear
Isolation, Structure Determination, and Total Synthesis of Hoshinoamide C, an Antiparasitic Lipopeptide from the Marine Cyanobacterium <i>Caldora penicillata</i>
we synthesized two possible diastereomers of hoshinoamide C and determined its absolute configuration based on a comparison of their spectroscopic data with those of the natural compound. Hoshinoamide C (1) did not exhibit any cytotoxicity against HeLa or HL60 cells at 10 μM, but inhibited the growth of the parasites responsible for malaria (IC50 0.96 μM) and African sleeping sickness (IC50 2.9 μM)
Hoshinoamide C ( 1 ) 是一种抗寄生虫脂肽,是从海洋蓝藻Caldora penicillata 中分离出来的。其平面结构通过光谱分析(主要是 2D NMR)阐明,α-氨基酸部分的绝对构型通过降解反应和手性相 HPLC 分析确定。为了阐明不寻常氨基酸部分的绝对构型,我们合成了星野酰胺 C 的两种可能的非对映异构体,并根据光谱数据与天然化合物的光谱数据的比较确定了其绝对构型。Hoshinoamide C ( 1 ) 在 10 μM 时对 HeLa 或 HL60 细胞没有表现出任何细胞毒性,但抑制了导致疟疾的寄生虫的生长 (IC 500.96 μM) 和非洲昏睡病 (IC 50 2.9 μM)。