Streamlined Subclass-Specific Absolute Quantification of Serum IgG Glycopeptides Using Synthetic Isotope-Labeled Standards.

Streamlined Subclass-Specific Absolute Quantification of Serum IgG Glycopeptides Using Synthetic Isotope-Labeled Standards.
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使用合成同位素标记标准品对血清 IgG 糖肽进行简化的亚类特异性绝对定量。

DOI:
10.1021/acs.analchem.0c04462
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发表时间:
2021-03-16
影响因子:
7.4
通讯作者:
Li L
Li L
中科院分区:
化学1区
文献类型:
--
作者:
Wang S;Liu D;Qu J;Zhu H;Chen C;Gibbons C;Greenway H;Wang P;Bollag RJ;Liu K;Li L

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Absolute glycoproteomics quantification has drawn tremendous attention owing to its prospects in biomarker discovery and clinical implementation but is impeded by a general lack of suitable heavy isotope-labeled glycopeptide standards. In this study, we devised a facile chemoenzymatic strategy to synthesize a total of 36 human IgG glycopeptides attached with well-defined glycoforms, including 15 isotope-labeled ones with a mass increment of 6 Da to their native counterparts. Spiking of these standards into human sera enabled simplified, robust, and precise absolute quantification of IgG glycopeptides in a subclass-specific fashion. Additionally, the implementation of the absolute quantification approach revealed subclass-dependent alteration of serum IgG galactosylation and sialylation in colon cancer samples.
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