Linkage Memory in Underivatized Protonated Carbohydrates.

Linkage Memory in Underivatized Protonated Carbohydrates.
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DOI:
10.1021/jasms.0c00440
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发表时间:
2021-02-03
影响因子:
3.2
通讯作者:
Guttman M
Guttman M
中科院分区:
化学3区
文献类型:
--
作者:
Mookherjee A;Uppal SS;Murphree TA;Guttman M

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碳水化合物是最复杂的一类生物分子,其结构的细微变化都归因于不同的生物功能。质谱分析对于大规模糖组学和糖蛋白质组学研究至关重要,但碳水化合物的气相结构和有时异常的碎片化特性提出了长期的挑战。在这里,我们调查的气相性质的异构质子化二糖不同的连接配置的面板。多个构象是明显的,大部分的结构的基础上,其碎片离子丰度串联质谱,其离子迁移率在几种气体中,其氘吸收动力学的气相氢氘交换。最值得注意的是,我们发现的Y-离子片段的特性的前体碳水化合物的连接配置的影响。这项研究揭示了质子化碳水化合物碎片离子如何保留“连锁记忆”,从而提供对其完整前体的结构洞察。
Carbohydrates are among the most complex class of biomolecules and even subtle variations in their structures are attributed to diverse biological function. Mass spectrometry has been essential for large scale glycomics and glycoproteomics studies, but the gas-phase structures and sometimes anomalous fragmentation properties of carbohydrates present longstanding challenges. Here we investigate the gas-phase properties of a panel of isomeric protonated disaccharides differing in their linkage configurations. Multiple conformations were evident for most of the structures based on their fragment ion abundances by tandem mass spectrometry, their ion mobilities in several gases, and their deuterium uptake kinetics by gas-phase hydrogen deuterium exchange. Most notably, we find that the properties of the Y-ion fragments are characteristically influenced by the precursor carbohydrate’s linkage configuration. This study reveals how protonated carbohydrate fragment ions can retain ‘linkage memory’ that provides structural insight into their intact precursor.
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