Synthesis and Mass Spectral Characterization of Mycobacterial Phosphatidylinositol and Its Dimannosides
作者:Gregory M. Rankin、Benjamin J. Compton、Karen A. Johnston、Colin M. Hayman、Gavin F. Painter、David S. Larsen
DOI:10.1021/jo301189y
日期:2012.8.17
phosphatidylinositol (PI) and its dimannosides (PIM2, AcPIM2, and Ac2PIM2) that all possess the predominant natural 19:0/16:0 phosphatidyl acylation pattern were prepared to study their massspectral fragmentations. Among these, the first synthesis of a fully lipidated PIM (i.e., (16:0,18:0)(19:0/16:0)-PIM2) was achieved from (±)-1,2:4,5-diisopropylidene-d-myo-inositol in 16 steps in 3% overall yield. A key feature
准备一个均具有主要的天然19:0/16:0磷脂酰酰化模式的天然分枝杆菌磷脂酰肌醇(PI)及其二甘露糖苷(PIM 2,AcPIM 2和Ac 2 PIM 2)家族,以研究其质谱碎裂。其中,完全脂化的PIM(即(16:0,18:0)(19:0/16:0)-PIM 2)的首次合成是由(±)-1,2:4,5实现的-diisopropylidene- d -肌醇肌醇在3%总产率16个步骤。该策略的关键特征是扩展了对-(3,4-二甲氧基苯基)苄基保护基在O上的应用。-3位肌醇允许在合成的后期安装硬脂酰残基。对合成的PIM进行了质谱研究,并将其与从M.的脂质提取物中鉴定出的天然PIM的报道进行了比较。牛眼BCG。这些分析证实,片段化模式可用于从细胞壁脂质提取物中鉴定特定PIM的结构。
Chemical Synthesis of All Phosphatidylinositol Mannoside (PIM) Glycans from <i>Mycobacterium tuberculosis</i>
作者:Siwarutt Boonyarattanakalin、Xinyu Liu、Mario Michieletti、Bernd Lepenies、Peter H. Seeberger
DOI:10.1021/ja806283e
日期:2008.12.10
interactions with host cells, and to investigate the function of PIMs as potential antigens and/or adjuvants for vaccine development. Here, we report the efficient synthesis of all PIMs including phosphatidylinositol (PI) and phosphatidylinositol mono- to hexa-mannoside (PIM1 to PIM6). Robust synthetic protocols were developed for utilizing bicyclic and tricyclic orthoesters as well as mannosyl phosphates
this study, we synthesized the exact substructures of the LM glycans that consist of an α(1,6) mannan core, with and without the complete α(1,2) mannose branching, and comparatively studied their protein–carbohydrate interactions. The synthetic LM glycans were equipped with a thiol linker for immobilizations on the surfaces of microarrays. As per our findings, the presence of the branching α(1,2) mannose