Tags for the Stable Isotopic Labeling of Carbohydrates and Quantitative Analysis by Mass Spectrometry
作者:Michael J. Bowman、Joseph Zaia
DOI:10.1021/ac070581b
日期:2007.8.1
Although stable isotopic labeling has found widespread use in the proteomics field, its application to carbohydrate quantification has been limited. Herein we report the design, synthesis, and application of a novel series of compounds that allow for the incorporation of isotopic variation within glycan structures. The novel feature of the compounds is the ability to incorporate the isotopes in a controlled manner, allowing for the generation of four tags that vary only in their isotopic content. This allows for the direct comparisons of three samples or triplicate measurements with an internal standard within one mass spectral analysis. Quantitation of partially depolymerized glycosaminoglycan mixtures, as well as N-linked glycans released from fetuin, is used to demonstrate the utility of the tetraplex tagging strategy.
尽管稳定同位素标记在蛋白质组学领域得到了广泛应用,但其在碳水化合物定量中的应用却十分有限。本文报告了一种新型化合物系列的设计、合成及应用,这些化合物能够在糖结构中引入同位素变异。这些化合物的新颖之处在于能够以受控方式引入同位素,从而生成仅在同位素含量上有所不同的四种标签。这使得在一次质谱分析中能够直接比较三个样品或三重重复测量与内标。通过部分解聚的糖胺聚糖混合物以及从胎球蛋白释放的N-连接糖的定量分析,展示了四联标签策略的实用性。