Abstract
Identification of protein-protein interactions often provides insight into protein function, and many cellular processes are performed by stable protein complexes. We used tandem affinity purification to process 4,562 different tagged proteins of the yeast Saccharomyces cerevisiae. Each preparation was analysed by both matrix-assisted laser desorption/ ionization-time of flight mass spectrometry and liquid chromatography tandem mass spectrometry to increase coverage and accuracy. Machine learning was used to integrate the mass spectrometry scores and assign probabilities to the protein-protein interactions. Among 4,087 different proteins identified with high confidence by mass spectrometry from 2,357 successful purifications, our core data set (median precision of 0.69) comprises 7,123 protein-protein interactions involving 2,708 proteins. A Markov clustering algorithm organized these interactions into 547 protein complexes averaging 4.9 subunits per complex, about half of them absent from the MIPS database, as well as 429 additional interactions between pairs of complexes. The data (all of which are available online) will help future studies on individual proteins as well as functional genomics and systems biology.
Original language | English (US) |
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Pages (from-to) | 637-643 |
Number of pages | 7 |
Journal | Nature |
Volume | 440 |
Issue number | 7084 |
DOIs | |
State | Published - Mar 30 2006 |
Funding
Acknowledgements We thank M. Chow, N. Mohammad, C. Chung and V. Fong for their assistance with the creation of the web resources. We are grateful to J. van Helden and S. Brohée for sharing information on their comparison of clustering methods before publication. This research was supported by grants from Genome Canada and the Ontario Genomics Institute (to J.F.G. and A.E.), the Canadian Institutes of Health Research (to A.E., N.J.K., J.F.G., S.J.W., S.P. and C.J.I.), the National Cancer Institute of Canada with funds from the Canadian Cancer Society (to J.F.G.), the Howard Hughes Medical Institute (to J.S.W. and E.O.), the McLaughlin Centre for Molecular Medicine (to S.J.W. and S.P.), the Hospital for Sick Children (to J.M.P.-A.), the National Sciences and Engineering Research Council (to N.J.K., T.R.H. and A.E.) and the National Institutes of Health (to A.S., M.G., A.P. and H.Y.).
ASJC Scopus subject areas
- General