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Quirks of Error Estimation in Cross-Linking/Mass Spectrometry

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Original languageEnglish
JournalAnalytical Chemistry
Volume89
Issue number7
Early online date7 Mar 2017
DOIs
StatePublished - 4 Apr 2017

Abstract

Cross-linking/mass spectrometry is an increasingly popular approach to obtain structural information on proteins and their complexes in solution. However, methods for error assessment are under current development. We note that false-discovery rates can be estimated at different points during data analysis, and are most relevant for residue or protein pairs. Missing this point led in our example analysis to an actual 8.4% error when 5% error was targeted. In addition, pre-filtering of peptide-spectrum matches and of identified peptide pairs substantially improved results. In our example, this pre-filtering increased the number of residue pairs (5% FDR) by 33% (n=108 to n=144). This number improvement did not come at the expense of reduced accuracy as the added data agreed with an available crystal structure. We provide an open-source tool, xiFDR (https://github.com/rappsilberlab/xiFDR), that implements our observations for routine application.

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