Improved Methods and Commercialization of Native Mass Spectrometry by Capillary Vibrating Sharp-edge Spray Ionization (cVSSI)

摘要/摘要 在过去的20年里，质谱学(MS)仪器以惊人的速度发展 剪辑。离子聚焦、质量分析器和离子检测领域的改进有很大的提高 使研究处于天然状态(天然MS)的蛋白质分子成为可能。有一个地区拥有 保持相对恒定的是电离源，其中纳米电喷雾电离(NESI) 仍然是生产感兴趣的大生物分子的最灵敏的方法。一场严重的 Nesi for Native MS的缺点是在负值运行时会出现稳定性问题 离子模式。这主要是由于负离子电晕放电开始较早所致。 一种废除离子生产的模式。这一限制的结果是大大减少了 天然MS AS&GT；104蛋白的效用表现出PI值低于6。这对 从治疗分子到对人类健康重要的蛋白质结构的研究 那些与疾病的发生和发展有关的因素。最近，李嘉诚教授的课题组。 西弗吉尼亚大学的彭骊开发了一种名为振动的新电离技术 尖端喷雾电离(VSSI)。该方法最近已被证明提供了 与最先进的方法相比，电离性能提高了10倍到100倍 在负离子模式下运行。在这里，我们将利用新方法的力量来 提供一个原型电离源，将持续提供100倍的信号增强 在负离子模式下提高10倍，在正离子模式下提高10倍。这些电离的飞跃 效率将开启高效原生MS实验的大门，特别是在消极的情况下 离子模式。其结果将是使人类健康研究人员能够表征这些结构 到目前为止，许多重要的蛋白质在很大程度上仍然无法获得。

Abstract/Summary Over the last 20 years, mass spectrometry (MS) instrumentation has advanced at a remarkable clip. Improvements in ion focusing, mass analyzer, and ion detection regions have greatly enabled the study of protein molecules in their native state (native MS). One area that has remained relatively constant is the ionization source where nanoelectrospray ionization (nESI) has remained the most sensitive means to produce the large biomolecules of interest. A severe drawback of nESI for native MS is that it suffers from stability issues when operated in negative ion mode. This primarily results from the earlier onset of the corona discharge in negative ion mode which abrogates ion production. The result of this limitation is to drastically reduce the utility of native MS as >104 proteins exhibit PI values below 6. This has implications for the study of protein structures important to human health ranging from therapeutic molecules to those associated with disease onset and progression. Recently, the research group of Prof. Peng Li at West Virginia University developed a new ionization technique termed Vibrating Sharp-edge Spray Ionization (VSSI). The approach has recently been demonstrated to provide a 10× to 100× boost in ionization performance compared with state-of-the-art approaches operated in negative ion mode. Here, we will leverage the power of the new approach to provide a prototype ionization source which will consistently provide 100× signal enhancements in negative ion mode and 10× improvement in positive ion mode. These leaps in ionization efficiency will unlock the door to high-efficiency native MS experiments especially in negative ion mode. The result will be to enable human health researchers to characterize the structures of many important proteins that have heretofore remained largely inaccessible.