Negative Electron Transfer Dissociation Sequencing of 3-O-Sulfation-Containing Heparan Sulfate Oligosaccharides.

Negative Electron Transfer Dissociation Sequencing of 3-O-Sulfation-Containing Heparan Sulfate Oligosaccharides.
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含 3-O-硫酸化的硫酸乙酰肝素寡糖的负电子转移解离测序。

DOI:
10.1007/s13361-018-1907-0
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发表时间:
2018
影响因子:
3.2
通讯作者:
Zaia,Joseph
Zaia,Joseph
中科院分区:
化学3区
文献类型:
--
作者:
Wu,Jiandong;Wei,Juan;Hogan,JohnD;Chopra,Pradeep;Joshi,Apoorva;Lu,Weigang;Klein,Joshua;Boons,Geert-Jan;Lin,Cheng;Zaia,Joseph

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在解离方法中,负电子转移解离(NETD)已被证明是糖胺聚糖(GAG)测序最有用的方法,因为它产生信息碎片、低程度的硫酸盐损失、高灵敏度和可翻译为多种仪器类型。然而,挑战在于区分不同位置的硫酸盐化。特别是,据报道,NETD无法区分硫酸软骨素脱糖中的4-O-和6-O-硫酸盐。这引起了人们的关注,即NETD是否能够区分硫酸乙酰肝素(HS)寡糖中罕见的3-O-硫酸盐和主要的6-O-硫酸盐。在这里,我们报告了NETD产生高信息量的光谱,区分氨基葡萄糖残基上的磺化部位,从而能够表征含有3-O-硫化的合成HS异构体的结构。此外,对来自天然来源的抗裂解酶的3-O-硫酸四糖进行了成功的测序。值得注意的是,对于本研究中的所有低聚糖,成功的测序是基于通常观察到的去质子化前体离子的NETD串联质谱图,没有衍生化或金属阳离子加成,简化了实验流程和数据解释。这些结果证明了NETD作为一种灵敏的分析工具的潜力,用于详细的、高通量的高度硫酸盐化GAG的结构分析。
Among dissociation methods, negative electron transfer dissociation (NETD) has been proven the most useful for glycosaminoglycan (GAG) sequencing because it produces informative fragmentation, a low degree of sulfate losses, high sensitivity, and translatability to multiple instrument types. The challenge, however, is to distinguish positional sulfation. In particular, NETD has been reported to fail to differentiate 4-O- versus 6-O-sulfation in chondroitin sulfate decasaccharide. This raised the concern of whether NETD is able to differentiate the rare 3-O-sulfation from predominant 6-O-sulfation in heparan sulfate (HS) oligosaccharides. Here, we report that NETD generates highly informative spectra that differentiate sites ofO-sulfation on glucosamine residues, enabling structural characterizations of synthetic HS isomers containing 3-O-sulfation. Further, lyase-resistant 3-O-sulfated tetrasaccharides from natural sources were successfully sequenced. Notably, for all of the oligosaccharides in this study, the successful sequencing is based on NETD tandem mass spectra of commonly observed deprotonated precursor ions without derivatization or metal cation adduction, simplifying the experimental workflow and data interpretation. These results demonstrate the potential of NETD as a sensitive analytical tool for detailed, high-throughput structural analysis of highly sulfated GAGs.
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