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使用基于碰撞,电子和光子的激活方法对超电荷蛋白进行自上而下的分析
Kyle J Juetten1, Jennifer S Brodbelt1
1Department of Chemistry, University of Texas at Austin, Austin, Texas 78712, United States.
Journal of the American Society for Mass Spectrometry
|June 26, 2023
概括
超级充电蛋白在激活方法中不同地影响碎片化模式. 虽然一些方法减少了序列覆盖率,但其他方法 (如UVPD和EThcD) 维持或改进了序列覆盖率,从而提高了裂变部位的识别.
科学领域:
- 蛋白质组学是指蛋白质组学.
- 质谱测量质量谱测量
- 生物化学 生物化学
背景情况:
- 超级充电会增加蛋白质的电荷状态,这可能会改变质谱学中的碎片化行为.
- 了解这些变化对于优化蛋白质分析和序列覆盖至关重要.
研究的目的:
- 通过使用各种激活方法,研究超级充电对蛋白质分裂模式的影响.
- 为了评估不同激活条件下的序列覆盖率和偏好的分离点的变化.
主要方法:
- 使用五种激活方法分析了六种模型蛋白:高能碰撞解离 (HCD),电子转移解离 (ETD),电子转移高能碰撞解离 (EThcD),213nm紫外光光解离 (UVPD) 和193nm紫外光光解离.
- 在非超电荷和超电荷条件下分析了蛋白质.
- 评估了碎片化模式,序列覆盖范围和分离地点偏好.
主要成果:
- 超级充电导致HCD的序列覆盖率大幅下降,但ETD的收益很小.
- EThcD,213nm UVPD 和193nm UVPD 在序列覆盖率上显示出最小的变化,通常产生最高覆盖率.
- 在所有方法中,优选的骨干切割部位得到了增强,特别是HCD,213nm UVPD和193nm UVPD.
- 超级充电始终为ETD,EThcD,213nm UVPD和193nm UVPD引入了新的骨干裂纹点.
结论:
- 超级充电对蛋白质分裂的影响高度依赖于所使用的激活方法.
- UVPD 和 EThcD 是稳健的方法,即使使用超电荷蛋白质,也可以保持高序列覆盖率.
- 超级充电可以提高特定裂变点的识别,有助于详细的蛋白质组分析.
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