数字离子陷隔离和对具有多重电荷离子附着的宏分子分析物的质量分析
Liangxuan Fu1, Nicholas R Ellin1, Nicolas J Pizzala1
1Department of Chemistry, Purdue University, West Lafayette, Indiana 47907-2084, United States.
Journal of the American Society for Mass Spectrometry
|August 19, 2024
概括
数字离子陷 (DIT) 中的多电荷离子附着 (MIA) 便于复杂混合物的质量和电荷分配. 这种方法解决了重叠的质量电荷比率,使得像核糖体这样的大型生物分子的准确分析成为可能.
科学领域:
- 分析化学 分析化学
- 质谱测量质量谱测量
- 生物化学 生物化学
背景情况:
- 复杂混合物的电子喷射电离 (ESI) 产生具有重叠质量-电荷 (m/z) 比率的多重电荷离子,使分析复杂化.
- 准确的质量和电荷状态的确定对于表征异质宏分子组件至关重要.
研究的目的:
- 为了证明多重电荷离子附着 (MIA) 在数字离子陷 (DIT) 中的可行性,以解决复杂的混合物.
- 为了在原生条件下准确地分配宏分子分析物的质量和电荷.
主要方法:
- 采用双重2D-3D DIT仪器进行高m/z离子隔离和分析.
- 通过将多重电荷的试剂离子 (例如,免疫球蛋白G) 与相反极性的分析离子反应而使用的MIA.
- 进行了对β-galactosidase和大肠杆菌核糖体混合物的实验.
主要成果:
- 成功地在DIT中证明了MIA,用于复杂的宏分子离子的电荷和质量赋值.
- 通过离子-离子反应实现了显著的m/z位移,促进重叠信号的分离.
- 在E. coli 70S核糖体颗粒 (>2.2 MDa) 混合物中的三个组件的分解和赋值质量和电荷.
结论:
- DIT中的MIA是克服分析异质宏分子混合物的挑战的强大策略.
- 这种方法显著提高了对大型生物分子精确质量和电荷测定的能力.
- DIT的高m/z离子处理能力是这种离子/离子反应战略成功的关键.
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