A HUPO test sample study reveals common problems in mass spectrometry-based proteomics.
A HUPO test sample study reveals common problems in mass spectrometry-based proteomics.
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DOI:
10.1038/nmeth.1333
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发表时间:
2009-06
期刊:
影响因子:
48
通讯作者:
Bergeron, John J. M.
中科院分区:
文献类型:
--
作者:
Bell, Alexander W.;Deutsch, Eric W.;Au, Catherine E.;Kearney, Robert E.;Beavis, Ron;Sechi, Salvatore;Nilsson, Tommy;Bergeron, John J. M.
We carried out a test sample study to try to identify errors leading to irreproducibility, including incompleteness of peptide sampling, in LC-MS-based proteomics. We distributed a test sample consisting of an equimolar mix of 20 highly purified recombinant human proteins, to 27 laboratories for identification. Each protein contained one or more unique tryptic peptides of 1250 Da to also test for ion selection and sampling in the mass spectrometer. Of the 27 labs, initially only 7 labs reported all 20 proteins correctly, and only 1 lab reported all the tryptic peptides of 1250 Da. Nevertheless, a subsequent centralized analysis of the raw data revealed that all 20 proteins and most of the 1250 Da peptides had in fact been detected by all 27 labs. The centralized analysis allowed us to determine sources of problems encountered in the study, which include missed identifications (false negatives), environmental contamination, database matching, and curation of protein identifications. Improved search engines and databases are likely to increase the fidelity of mass spectrometry-based proteomics.
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