Chromatin Central: towards the comparative proteome by accurate mapping of the yeast proteomic environment.
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.
Shevchenko
Anna
A
MPI of Molecular Cell Biology and Genetics, Pfotenhauerstrasse 108, 01307 Dresden, Germany. ashevche@mpi-cbg.de
Roguev
Assen
A
Schaft
Daniel
D
Buchanan
Luke
L
Habermann
Bianca
B
Sakalar
Cagri
C
Thomas
Henrik
H
Krogan
Nevan J
NJ
Shevchenko
Andrej
A
Stewart
A Francis
AF
D025941:Protein Interaction Mapping; D040901:Proteomics; D012441:Saccharomyces cerevisiae / Q000737:chemistry*; D029701:Saccharomyces cerevisiae Proteins / Q000032:analysis*; D012568:Schizosaccharomyces / Q000737:chemistry*; D029702:Schizosaccharomyces pombe Proteins / Q000032:analysis*
D029701:Saccharomyces cerevisiae Proteins; D029702:Schizosaccharomyces pombe Proteins