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Letter

Nature Genetics 35, 176–179 (1 October 2003) | doi:10.1038/ng1242

Evolutionary conservation of motif constituents in the yeast protein interaction network

S Wuchty , Z N Oltvai & A-L Barab|[aacute]|si

Understanding why some cellular components are conserved across species but others evolve rapidly is a key question of modern biology. Here we show that in Saccharomyces cerevisiae, proteins organized in cohesive patterns of interactions are conserved to a substantially higher degree than those that do not participate in such motifs.