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Large-scale mapping of human protein-protein interactions by mass spectrometry.

Molecular systems biology | Mar 13, 2007

http://www.ncbi.nlm.nih.gov/pubmed/17353931

Mapping protein-protein interactions is an invaluable tool for understanding protein function. Here, we report the first large-scale study of protein-protein interactions in human cells using a mass spectrometry-based approach. The study maps protein interactions for 338 bait proteins that were selected based on known or suspected disease and functional associations. Large-scale immunoprecipitation of Flag-tagged versions of these proteins followed by LC-ESI-MS/MS analysis resulted in the identification of 24,540 potential protein interactions. False positives and redundant hits were filtered out using empirical criteria and a calculated interaction confidence score, producing a data set of 6463 interactions between 2235 distinct proteins. This data set was further cross-validated using previously published and predicted human protein interactions. In-depth mining of the data set shows that it represents a valuable source of novel protein-protein interactions with relevance to human diseases. In addition, via our preliminary analysis, we report many novel protein interactions and pathway associations.

Pubmed ID: 17353931 RIS Download

Mesh terms: Humans | Immunoprecipitation | Protein Binding | Proteins | Spectrometry, Mass, Electrospray Ionization

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BioGRID (Data, Interactions)

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