在山羊胆乳中发现的不寻常的自由三糖体是通过逻辑衍生序列并联质谱学发现的
Wei-Chien Weng1,2, Hung-En Liao1,3, Cheng-Hsiu Chang4
1Institute of Atomic and Molecular Sciences, Academia Sinica, Taipei, 106216, Taiwan.
Scientific reports
|January 10, 2025
概括
羊奶含有独特的寡糖类,与人乳不同,具有多样化的结构和多样化的减少端. 这一发现揭示了山羊的可能更复杂的牛奶糖生物合成.
科学领域:
- 葡萄糖生物学 葡萄糖生物学
- 质谱测量质量谱测量
- 比较生物化学 的比较.
背景情况:
- 人类牛奶寡糖 (HMO) 对婴儿健康至关重要,通常以乳糖结束.
- 羊奶寡糖 (CMOs) 与HMO具有结构上的相似之处.
- 传统的寡糖结构测定方法缺乏灵敏度和完整性.
研究的目的:
- 为了完全描述山羊胆乳和成熟牛奶中自由中性三糖的结构.
- 为了识别新的寡糖结构和它们的减少端.
- 为了比较CMO与HMO的结构多样性.
主要方法:
- 使用逻辑衍生序列串联质谱法 (MS/MS) 进行高灵敏度分析.
- 确定完整的寡糖结构:组成,结合位置,异构性和立体异构体.
- 已识别出低丰度的寡糖,包括以前未报告的同位素.
主要成果:
- 在山羊奶中发现了 (Hex) 2HexNAc, (Hex) 3和 (Hex) 2Fuc 的新异构体.
- 发现许多CMO并没有以乳糖结尾;相反,它们具有Glcβ-(1-4) -Glc或Glcβ-(1-4) -GlcNAc的减少端.
- 与成熟的山羊和母乳相比,在山羊胆乳中观察到这些不寻常的寡糖的较高度和更大的结构多样性.
结论:
- 羊奶寡糖体表现出显著的结构多样性,其中许多缺乏乳糖在减少端.
- 复杂的结构表明,与母乳相比,山羊奶中的生物合成途径更复杂.
- 逻辑衍生序列串联质谱是全面的寡糖类分析的强大工具.
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