Characterization of Conformational Ensembles of Protonated N-glycans in the Gas-Phase.

Characterization of Conformational Ensembles of Protonated N-glycans in the Gas-Phase.
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气相中质子化N-聚糖的构象合奏的表征。

DOI:
10.1038/s41598-018-20012-0
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发表时间:
2018-01-26
期刊:
影响因子:
4.6
通讯作者:
Sugita Y
Sugita Y
中科院分区:
综合性期刊3区
文献类型:
--
作者:
Re S;Watabe S;Nishima W;Muneyuki E;Yamaguchi Y;MacKerell AD Jr;Sugita Y

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离子淌度质谱 (IM-MS) 是一种能够根据生物分子的碰撞截面 (CCS) 研究生物分子结构变化的技术。 IM-MS 的最新进展使我们能够分离具有细微构象差异的碳水化合物异构体,但 CCS 和原子结构之间的关系仍然难以捉摸。在这里,我们使用增强采样的分子动力学模拟来表征电喷雾电离条件下气相 N-聚糖的构象集合。我们发现异构体之间 CCS 的分离反映了 N-聚糖的折叠特征,这是由化学成分和质子化状态决定的。提供 N-聚糖 CCS 的物理化学基础不仅有助于解释 IM-MS 测量结果,还有助于估计复杂聚糖的 CCS。
Ion mobility mass spectrometry (IM-MS) is a technique capable of investigating structural changes of biomolecules based on their collision cross section (CCS). Recent advances in IM-MS allow us to separate carbohydrate isomers with subtle conformational differences, but the relationship between CCS and atomic structure remains elusive. Here, we characterize conformational ensembles of gas-phase N-glycans under the electrospray ionization condition using molecular dynamics simulations with enhanced sampling. We show that the separation of CCSs between isomers reflects folding features of N-glycans, which are determined both by chemical compositions and protonation states. Providing a physicochemical basis of CCS for N-glycans helps not only to interpret IM-MS measurements but also to estimate CCSs of complex glycans.
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发表时间: 2015-01-07
影响因子: 16.6
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