Calyxamides A and B, Cytotoxic Cyclic Peptides from the Marine Sponge <i>Discodermia calyx</i>
作者:Miki Kimura、Toshiyuki Wakimoto、Yoko Egami、Karen Co Tan、Yuji Ise、Ikuro Abe
DOI:10.1021/np2009187
日期:2012.2.24
thiazole moieties were isolated from the marine sponge Discodermia calyx collected near Shikine-jima Island, Japan. The structures of calyxamides A (1) and B (2), including the absolute configurations of all amino acids, were elucidated by spectroscopic analyses and degradation experiments. The structures are similar to keramamides F and G, previously isolated from Theonella sp. The analysis of the
从日本Shikine-jima岛附近收集的海洋海绵Discodermia花萼中分离出含有5-羟色氨酸和噻唑部分的环肽。通过光谱分析和降解实验阐明了花萼酰胺A(1)和B(2)的结构,包括所有氨基酸的绝对构型。结构类似于先前从Theonella sp。分离的角酰胺F和G。从宏基因组DNA获得的16S rDNA序列的分析D.花萼揭示暂定存在Entotheonella属,一个不可培养δ-变形菌居住在Theonella 属,并涉及生物活性肽的生物合成。