Abstract:
BACKGROUND:Understanding the design logic of living systems requires the understanding and comparison of proteomes. Proteomes define the commonalities between organisms more precisely than genomic sequences. Because uncertainties remain regarding the accuracy of proteomic data, several issues need to be resolved before comparative proteomics can be fruitful. RESULTS:The Saccharomyces cerevisiae proteome presents the highest quality proteomic data available. To evaluate the accuracy of these data, we intensively mapped a proteomic environment, termed 'Chromatin Central', which encompasses eight protein complexes, including the major histone acetyltransferases and deacetylases, interconnected by twelve proteomic hyperlinks. Using sequential tagging and a new method to eliminate background, we confirmed existing data but also uncovered new subunits and three new complexes, including ASTRA, which we suggest is a widely conserved aspect of telomeric maintenance, and two new variations of Rpd3 histone deacetylase complexes. We also examined the same environment in fission yeast and found a very similar architecture based on a scaffold of orthologues comprising about two-thirds of all proteins involved, whereas the remaining one-third is less constrained. Notably, most of the divergent hyperlinks were found to be due to gene duplications, hence providing a mechanism for the fixation of gene duplications in evolution. CONCLUSIONS:We define several prerequisites for comparative proteomics and apply them to examine a proteomic environment in unprecedented detail. We suggest that high resolution mapping of proteomic environments will deliver the highest quality data for comparative proteomics.
journal_name
Genome Bioljournal_title
Genome biologyauthors
Shevchenko A,Roguev A,Schaft D,Buchanan L,Habermann B,Sakalar C,Thomas H,Krogan NJ,Shevchenko A,Stewart AFdoi
10.1186/gb-2008-9-11-r167subject
Has Abstractpub_date
2008-01-01 00:00:00pages
R167issue
11eissn
1474-7596issn
1474-760Xpii
gb-2008-9-11-r167journal_volume
9pub_type
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