Charge Prediction Machine: Tool for Inferring Precursor Charge States of Electron Transfer Dissociation Tandem Mass Spectra
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- 作者：Paulo C. Carvalho*† ; ‡ ; ; Daniel Cociorva‡ ; ; Catherine C. L. Wong‡ ; ; Maria da Gloria da C. Carvalho§ ; ; Valmir C. Barbosa
- 刊名：Analytical Chemistry
- 出版年：2009
- 出版时间：March 1, 2009
- 年：2009
- 卷：81
- 期：5
- 页码：1996-2003
- 全文大小：237K
- 年卷期：v.81,no.5(March 1, 2009)
- ISSN：1520-6882
文摘
Electron transfer dissociation (ETD) can dissociate highly charged ions. Efficient analysis of ions dissociated with ETD requires accurate determination of charge states for calculation of molecular weight. We created an algorithm to assign the charge state of ions often used for ETD. The program, Charge Prediction Machine (CPM), uses Bayesian decision theory to account for different charge reduction processes encountered in ETD and can also handle multiplex spectra. CPM correctly assigned charge states to 98% of the 13097 MS2 spectra from a combined data set of four experiments. In a comparison between CPM and a competing program, Charger (ThermoFisher), CPM produced half the mistakes.