期刊
ANALYTICAL CHEMISTRY
卷 83, 期 3, 页码 790-796出版社
AMER CHEMICAL SOC
DOI: 10.1021/ac102272r
关键词
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资金
- National Institutes of Health [R01 RR024236-01A1]
- National Cancer Institute [U24 CA126480-01]
We estimated the reproducibility of tandem mass spectra for the widely Used collision-induced dissociation (CID) of peptide ions. Using the Pearson correlation coefficient as a measure of spectral similarity, we found that the within-experiment reproducibility of fragment ion intensities is very high (about 0.85). However, across different experiments and instrument types/setups, the correlation decreases by more than 15% (to about 0.70). We further investigated the accuracy of current predictors of peptide fragmentation spectra and found that they are more accurate than the ad-hoc models generally used by search engines (e.g., SEQUEST) and, surprisingly, approaching the empirical upper limit set by he average across-experiment spectral reproducibility (especially for charge +1 and charge +2 precursor ions). These results provide evidence that, in terms of accuracy of modeling, predicted peptide I fragmentation spectra provide a viable alternative to spectral libraries for 1 peptide identification, with a higher coverage of peptides and lower storage 1 requirements. Furthermore, using five data sets of proteome digests by two different proteases, we find that PeptideART (a data-driven machine learning approach) is generally more accurate than MassAnalyzer (an approach based on a kinetic model for peptide fragmentation in predicting fragmentation spectra but that both models are significantly more accurate than the ad-hoc models.
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