使用库洛米特质谱测量对和糖的绝对定量
Md Tanim-Al Hassan1, Yongling Ai1, Bhavya Deshaboina1
1Department of Chemistry and Environmental Science, New Jersey Institutes of Technology, University Heights, Newark, New Jersey 07102, United States.
ACS measurement science au
|August 27, 2025
概括
这项研究提出了一种新方法,使用密度测量质谱 (CMS) 准确量化蛋白质翻译后修饰 (PTM),如化和糖化,而不需要标准. 这种方法可以精确测量和糖,进步蛋白质学研究.
科学领域:
- 生物化学
- 分析化学
- 蛋白质组学
背景情况:
- 蛋白质的翻译后修饰 (PTMs),包括酸化和糖化,对于生物功能至关重要.
- 由于缺乏特定的或蛋白质标准,量化PTM是具有挑战性的.
研究的目的:
- 开发一种新的,无标准的方法来绝对量化和糖.
- 克服当前PTM量化技术的局限性.
主要方法:
- 酸的酶去化,然后进行度质谱 (CMS).
- 用于CMS量化,用甲基醇标记 (DPDP) 的电化学无活性和糖的N终端衍生.
- 从NIST单克隆抗体 (mAb) 中量化糖的方法的应用.
主要成果:
- 用0.3%的误差精确量化.
- 成功量化衍生和糖,误差低于6%.
- 在没有标准的情况下使用CMS从单克隆抗体中定量五个N297糖.
结论:
- 开发的基于CMS的方法可以进行无标准的和糖的绝对量化.
- 这种方法显著提高了涉及PTM的精确定量蛋白质组学和生物研究的潜力.
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