2D-CEX-FcRn-MS用于研究mAb电荷变体的结构/功能关系
Liesa Verscheure1,2, Isabel Vandenheede1, Eline De Rore1
1RIC group, President Kennedypark 26, Kortrijk B-8500, Belgium.
Analytical chemistry
|October 29, 2024
概括
自动化的2D-LC-MS快速分析单克隆抗体 (mAb) 电荷变异及其FcRn结合亲和力. 沉重链的氧化显著减少了结合,使抗体治疗的发展更快.
科学领域:
- 生物化学和生物物理学
- 分析化学 分析化学
- 蛋白质治疗药物 蛋白质治疗药物
背景情况:
- 了解单克隆抗体 (mAb) 结构和功能之间的关系对于治疗开发至关重要.
- 评估电荷变异及其对新生儿结晶片受体 (FcRn) 结合的影响对于mAb疗效至关重要.
- 现有的mAb表征工作流往往是耗时且资源密集的.
研究的目的:
- 开发和验证一个自动化的二维液态色谱-质谱 (2D-LC-MS) 平台,用于对mAb电荷变量的同时结构和功能分析.
- 阐明特定修饰,特别是氧化对mAb与FcRn.的结合亲缘关系的影响.
- 与既有方法相比,提高mAb表征的效率并减少对资源的需求.
主要方法:
- 采用2D-LC-MS系统,在第一维中采用阴离子交换染色学 (CEX),在第二维中采用FcRn亲和染色学.
- 采用多重切心,用于自动收集和转移尺寸之间的电荷变量.
- 纳入后列变性溶液添加,以提高MS敏感性,并使用多维LC-MS (mD-LC-MS) 进行详细的结构分析.
主要成果:
- 通过强制降解诱导的mAb电荷变体的成功解决和特征.
- 确定重链 (HC) M253和M429氧化作为减少FcRn结合亲和力的主要驱动因素,氧化增加导致结合减少.
- 与传统的离线方法相比,通过率提高了7倍,材料需求大幅减少,与ELISA有约束力的数据有很好的相关性.
结论:
- 自动化的2D-LC-MS平台为mAbs的多属性分析提供了一种简化和高效的方法,集成结构和功能评估.
- 这种方法可以根据FcRn结合亲和力精确排列电荷变异,突出氧化作用的关键作用.
- 开发的平台通过提供快速,全面的mAb表征来加速开发更安全,更有效的抗体治疗方法.
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