De Novo Correction of Mass Measurement Error in Low Resolution Tandem MS Spectra for Shotgun Proteomics |
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| Authors: | Jarrett D Egertson Jimmy K Eng Michael S Bereman Edward J Hsieh Gennifer E Merrihew Michael J MacCoss |
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| Institution: | 1. Department of Genome Sciences, University of Washington, Seattle, WA, 98195, USA
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| Abstract: | We report an algorithm designed for the calibration of low resolution peptide mass spectra. Our algorithm is implemented in a program called FineTune, which corrects systematic mass measurement error in 1?min, with no input required besides the mass spectra themselves. The mass measurement accuracy for a set of spectra collected on an LTQ-Velos improved 20-fold from ?C0.1776?±?0.0010?m/z to 0.0078?±?0.0006?m/z after calibration (avg?±?95?% confidence interval). The precision in mass measurement was improved due to the correction of non-linear variation in mass measurement accuracy across the m/z range. |
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