Lei Yang, Yi Zhao, Xinyan Fu, Wenjing Zhang, Wei Xu
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引用次数: 0
摘要
原生质谱(nMS)正迅速成为探索蛋白质构象和蛋白质与配体相互作用的关键技术。开创性的研究表明,原生质谱中蛋白质的电荷状态分布(CSD)可以指示其溶剂可及表面积(SASA)。此外,除了 SASA 外,据推测蛋白质表面酸性和碱性氨基酸的丰度也会影响 CSD。具体来说,碱性氨基酸在电喷雾离子化(ESI)过程中容易带上正电荷,而酸性氨基酸则容易带上负电荷。因此,本研究调查了正离子和负离子模式下球状蛋白质的 CSD,以全面描述蛋白质 SASA 的特征。实验在原生 ESI 和原生纳米 ESI 条件下进行。通过利用在双极性 nMS 数据中观察到的平均电荷,我们显著增强了蛋白质 SASA 与其 CSD 之间的对数线性相关性。与仅利用正离子模式数据的模型相比,决定系数 (R2) 在ESI条件下从0.9866提高到0.9888,在纳米ESI条件下从0.9677提高到0.9902。这些发现表明,通过双极性 nMS 分析得出的 CSDs 可以有效地表征球蛋白的 SASA。
Characterizing Protein Solvent Accessible Surface Area in Solution by Dual Polarity Native Mass Spectrometry.
Native mass spectrometry (nMS) is rapidly emerging as a pivotal technique for exploring protein conformations and protein-ligand interactions. Pioneering research has demonstrated that the charge state distribution (CSD) of proteins in native mass spectra can be indicative of their solvent accessible surface area (SASA). Moreover, beyond SASA, it is postulated that the abundance of acidic and basic amino acids on the protein surface may also impact the CSD. Specifically, basic amino acids tend to acquire positive charges during electrospray ionization (ESI), whereas acidic amino acids are prone to adopting negative charges. Consequently, this study investigates the CSDs of globular proteins in both positive and negative ion modes to provide a comprehensive characterization of protein SASA. Experiments were conducted under both native ESI and native nano-ESI conditions. By harnessing the average charges observed across dual polarity nMS data, we achieved significantly enhanced log linear correlations between protein SASA and its CSDs. The coefficient of determination (R2) improved from 0.9866 to 0.9888 under ESI conditions and from 0.9677 to 0.9902 under nano-ESI conditions when compared to models utilizing only positive ion mode data. These findings suggest that the SASA of globular proteins can be effectively characterized through the CSDs derived from dual polarity nMS analysis.
期刊介绍:
The Journal of the American Society for Mass Spectrometry presents research papers covering all aspects of mass spectrometry, incorporating coverage of fields of scientific inquiry in which mass spectrometry can play a role.
Comprehensive in scope, the journal publishes papers on both fundamentals and applications of mass spectrometry. Fundamental subjects include instrumentation principles, design, and demonstration, structures and chemical properties of gas-phase ions, studies of thermodynamic properties, ion spectroscopy, chemical kinetics, mechanisms of ionization, theories of ion fragmentation, cluster ions, and potential energy surfaces. In addition to full papers, the journal offers Communications, Application Notes, and Accounts and Perspectives