Synthesis of Diaminopimelic Acid Containing Peptidoglycan Fragments and Tracheal Cytotoxin (TCT) and Investigation of Their Biological Functions
作者:Akiko Kawasaki、Yukie Karasudani、Yuji Otsuka、Mizuho Hasegawa、Naohiro Inohara、Yukari Fujimoto、Koichi Fukase
DOI:10.1002/chem.200801121
日期:2008.11.17
a new synthetic method for an orthogonally protected meso-DAP derivative, and then we constructed the glycopeptide structures. The ability of these fragments to stimulate human Nod1, as well as differences in Nod1 recognition of the variety of synthesized ligand structures were examined. The results showed that the substitution of the N terminus of iE-DAP is necessary for stronger Nod1 recognition
细菌细胞壁肽聚糖(PGN)是有效的免疫刺激剂和免疫佐剂。革兰氏阴性细菌和某些革兰氏阳性细菌的PGN包含中二氨基庚二酸(meso-DAP),最近我们已经证明细胞内蛋白Nod1是PGN受体,可以识别含DAP的肽。在这项研究中,我们实现了含DAP的PGN片段的合成,包括气管细胞毒素(TCT),GlcNAc-(β1-4)-(脱水)MurNAc-L-Ala-γ-D-Glu-的第一化学合成。 meso-DAP-D-Ala和DAP型PGN的重复单元GlcNAc-β1-4-MurNAc-L-Ala-γ-D-Glu-meso-DAP-D-Ala。对于PGN片段的合成,我们首先为正交保护的meso-DAP衍生物建立了一种新的合成方法,然后构建了糖肽结构。检查了这些片段刺激人Nod1的能力,以及Nod1对各种合成配体结构的识别的差异。结果表明,为了增强Nod1的识别能力,必须对iE-DAP的N末端进行取代,但是