A novel pyrimidine-based stable-isotope labeling reagent and its application to quantitative analysis using matrix-assisted laser desorption/ionization mass spectrometry
作者:Jing Zhang、Li Zhang、Ying Zhou、Yin-Long Guo
DOI:10.1002/jms.1260
日期:2007.11
As an extension of our previous work, a novel pyrimidine-based stable-isotope labeling reagent, [d0]-/[d6]-4,6-dimethoxy-2-(methylsulfonyl)pyrimidine (DMMSP), was developed for comparative quantification of proteins by matrix-assisted laser desorption/ionization time-of-flight mass spectrometry (MALDI-TOF MS). Our one-step labeling strategy combines several desirable properties such as cysteine-specific labeling, signal amplification and direct analysis with minimum sample handling. All these features not only allow easy interpretation for protein identification and quantification but also ensure rapid and sensitive progression to MS analysis. Using cysteine, Cys-containing peptide, and lysozyme digest as model samples, the labeling methodology was established and the following pilot application for quantitative analysis was accomplished with high confidence, accuracy, efficiency, and reproducibility. The application of DMMSP-labeling strategy is expected to provide a powerful new tool for comparative proteome research, especially for the analysis of low-abundance proteins. Copyright © 2007 John Wiley & Sons, Ltd.
作为我们之前工作的延伸,我们开发了一种新型嘧啶基稳定同位素标记试剂--[d0]-/[d6]-4,6-二甲氧基-2-(甲基磺酰基)嘧啶(DMMSP),用于基质辅助激光解吸电离飞行时间质谱(MALDI-TOF MS)对蛋白质进行比较定量。我们的一步标记策略结合了多种理想特性,如半胱氨酸特异性标记、信号放大和直接分析,只需最少的样品处理。所有这些特点不仅便于解释蛋白质的鉴定和定量,还能确保快速、灵敏地进行 MS 分析。以半胱氨酸、含 Cys 肽和溶菌酶消化液为模型样品,建立了标记方法,并在随后的定量分析试验应用中实现了高可信度、高准确度、高效率和高重现性。DMMSP 标记策略的应用有望为比较蛋白质组研究,尤其是低丰度蛋白质的分析提供一个强大的新工具。Copyright © 2007 John Wiley & Sons, Ltd. All Rights Reserved.