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在 LTQ-Orbitrap Velos 上使用 CID、HCD 和 ETD 进行靶向碎裂可提高肽段鉴定。

Improved peptide identification by targeted fragmentation using CID, HCD and ETD on an LTQ-Orbitrap Velos.

机构信息

Biomolecular Mass Spectrometry and Proteomics Group, Bijvoet Center for Biomolecular Research and Utrecht Institute for Pharmaceutical Sciences, Utrecht University, Padualaan 8, 3584 CH Utrecht, The Netherlands.

出版信息

J Proteome Res. 2011 May 6;10(5):2377-88. doi: 10.1021/pr1011729. Epub 2011 Apr 1.

Abstract

Over the past decade peptide sequencing by collision induced dissociation (CID) has become the method of choice in mass spectrometry-based proteomics. The development of alternative fragmentation techniques such as electron transfer dissociation (ETD) has extended the possibilities within tandem mass spectrometry. Recent advances in instrumentation allow peptide fragment ions to be detected with high speed and sensitivity (e.g., in a 2D or 3D ion trap) or at high resolution and high mass accuracy (e.g., an Orbitrap or a ToF). Here, we describe a comprehensive experimental comparison of using ETD, ion-trap CID, and beam type CID (HCD) in combination with either linear ion trap or Orbitrap readout for the large-scale analysis of tryptic peptides. We investigate which combination of fragmentation technique and mass analyzer provides the best performance for the analysis of distinct peptide populations such as N-acetylated, phosphorylated, and tryptic peptides with up to two missed cleavages. We found that HCD provides more peptide identifications than CID and ETD for doubly charged peptides. In terms of Mascot score, ETD FT outperforms the other techniques for peptides with charge states higher than 2. Our data shows that there is a trade-off between spectral quality and speed when using the Orbitrap for fragment ion detection. We conclude that a decision-tree regulated combination of higher-energy collisional dissociation (HCD) and ETD can improve the average Mascot score.

摘要

在过去的十年中,通过碰撞诱导解离(CID)的肽测序已成为基于质谱的蛋白质组学中首选的方法。替代碎片化技术(如电子转移解离(ETD))的发展扩展了串联质谱中的可能性。仪器的最新进展允许以高速和高灵敏度(例如,在二维或三维离子阱中)或高分辨率和高精度质量(例如,轨道阱或飞行时间)检测肽片段离子。在这里,我们描述了使用 ETD、离子阱 CID 和束型 CID(HCD)与线性离子阱或轨道阱读出器相结合的综合实验比较,用于对胰蛋白酶肽进行大规模分析。我们研究了哪种碎片化技术和质量分析器的组合对于分析不同的肽群体(如 N-乙酰化、磷酸化和具有多达两个缺失切割的胰蛋白酶肽)提供最佳性能。我们发现 HCD 对双电荷肽的肽鉴定比 CID 和 ETD 更多。就 Mascot 得分而言,对于电荷状态高于 2 的肽,ETD FT 优于其他技术。我们的数据表明,在使用轨道阱进行片段离子检测时,光谱质量和速度之间存在权衡。我们得出结论,高能碰撞解离(HCD)和 ETD 的决策树调节组合可以提高平均 Mascot 得分。

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