Chemical synthesis of ComX pheromone and related peptides containing isoprenoidal tryptophan residues
作者:Masahiro Okada、Isao Sato、Soo Jeong Cho、David Dubnau、Youji Sakagami
DOI:10.1016/j.tet.2006.06.074
日期:2006.9
precise stereochemistry. Here, the synthesis of the modified tryptophan derivatives was reported in detail. It was succeeded in synthesizing four optically active modified tryptophan methyl esters from which the four diastereomeric ComXRO-E-2 peptides were prepared. Since only one of the four diastereomers was spectroscopically identical to the natural pheromone and exhibited biological activity, the
ComX信息素是翻译后修饰的寡肽,可刺激枯草芽孢杆菌中群体感应控制的自然遗传能力。最近,确定了由菌株RO-E-2产生的ComX RO-E-2信息素的结构。基于NMR分析,将香叶烷基结合到色氨酸残基上,这导致形成三环结构。提出四种可能的立体化学异构体之一是基于对模型化合物的构象搜索,并假设天然信息素中的氨基酸残基具有I-构型。所有可能的修饰色氨酸残基和相应的ComX RO-E-2合成肽以确认精确的立体化学。在此,详细报道了修饰的色氨酸衍生物的合成。它成功地合成了四种旋光改性的色氨酸甲酯,由此制备了四种非对映异构的ComX RO-E-2肽。由于四种非对映异构体中只有一种在光谱上与天然信息素相同,并且具有生物学活性,因此可以明确地确定ComX RO-E-2信息素的绝对结构。此外,还注意到在培养液中还存在另外两种生物活性信息素,这些信息素与ComX RO-E-2信息素共同纯化。这些信息素被认为是C