JBIR-56 and JBIR-57, 2(1<i>H</i>)-Pyrazinones from a Marine Sponge-Derived <i>Streptomyces</i> sp. SpD081030SC-03
作者:Keiichiro Motohashi、Kennichi Inaba、Shinichiro Fuse、Takayuki Doi、Miho Izumikawa、Shams Tabrez Khan、Motoki Takagi、Takashi Takahashi、Kazuo Shin-ya
DOI:10.1021/np200386c
日期:2011.7.22
2(1H)-pyrazinone moiety. The absolute configurations of the amino acid residues were determined by application of Marfey’s method. Because 1 did not appear to comprise the normal connection of amino acid units, we confirmed its structure by the total synthesis of 1. Biosynthetically, 1 consists of a unique skeleton connected to the peptide chain at C-5 of the pyrazinone ring.
从海洋海绵中分离出代表新型链霉菌的菌株SpD081030SC-03 。从SpD081030SC-03的培养物中分离出两个3,5,6-三取代的2(1 H)-吡嗪酮,JBIR-56(1)和JBIR-57(2)。1和2的平面结构是根据广泛的NMR和MS分析指定的。另外,对1的甲基化衍生物的分析证实了3,5,6-三取代的2(1 H)-吡嗪酮部分。氨基酸残基的绝对构型通过应用Marfey方法来确定。因为1似乎不包含正常的氨基酸单元连接,我们通过1的全合成证实了其结构。在生物合成上,1由一个独特的骨架组成,该骨架在吡嗪酮环的C-5处连接至肽链。