首页> 外文期刊>Journal of mass spectrometry: JMS >Reflectron MALDI TOF and MALDI TOF/TOF mass spectrometry reveal novel structural details of native lipooligosaccharides
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Reflectron MALDI TOF and MALDI TOF/TOF mass spectrometry reveal novel structural details of native lipooligosaccharides

机译:Reflectron MALDI TOF和MALDI TOF / TOF质谱揭示了天然脂寡糖的新结构细节

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摘要

Lipooligosaccharides (LOS) are powerful Gram-negative glycolipids that evade the immune system and invade host animal and vegetal cells. The structural elucidation of LOS is pivotal to understanding the mechanisms of infection at the molecular level. The amphiphilic nature of LOS has been the main obstacle for structural analysis by matrix-assisted laser desorption/ionization (MALDI) mass spectrometry (MS). Our approach has resolved this important issue and has permitted us to obtain reflectron MALDI mass spectra of LOS to reveal the fine chemical structure with minimal structural variations. The high-quality MALDI mass spectra show LOS species characteristic of molecular ions and defined fragments due to decay in the ion source. The in-source decay yields B-type ions, which correspond to core oligosaccharide(s), and Y-type ions, which are related to lipid A unit(s). MALDI tandem time-of-flight (TOF/TOF) MS of lipid A allowed for the elucidation of its structure directly from purified intact LOS without the need for any chemical manipulations. These findings constitute a significant advancement in the analysis of such an important biomolecule by MALDI MS.
机译:脂寡糖(LOS)是强大的革兰氏阴性糖脂,可逃避免疫系统并侵袭宿主动物和植物细胞。 LOS的结构阐明对于在分子水平上了解感染的机制至关重要。 LOS的两亲性质已成为通过基质辅助激光解吸/电离(MALDI)质谱(MS)进行结构分析的主要障碍。我们的方法解决了这个重要问题,并允许我们获得LOS的反射器MALDI质谱,以揭示具有最小结构变化的精细化学结构。高质量MALDI质谱图显示了分子离子的LOS物种特征,以及由于离子源的衰减而导致的特定碎片。源内衰变产生与核心寡糖相对应的B型离子和与脂质A单位相关的Y型离子。脂质A的MALDI串联飞行时间(TOF / TOF)MS可以直接从纯化的完整LOS阐明其结构,而无需进行任何化学操作。这些发现构成了通过MALDI MS分析这种重要生物分子的重要进展。

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