Connectivity and expression in protein networks: proteins in a complex are uniformly expressed.
We explore the interplay between the protein-protein interactions network and the expression of the interacting proteins. It is shown that interacting proteins are expressed in significantly more similar cellular concentrations. This is largely due to interacting pairs which are part of protein complexes. We solve a generic model of complex formation and show explicitly that complexes form most efficiently when their members have roughly the same concentrations. Therefore, the observed similarity in interacting protein concentrations could be attributed to optimization for efficiency of complex formation.
Carmi
Shai
S
Minerva Center and Department of Physics, Bar-Ilan University, Ramat-Gan 52900, Israel.
Levanon
Erez Y
EY
Havlin
Shlomo
S
Eisenberg
Eli
E
D003198:Computer Simulation; D015966:Gene Expression Regulation, Fungal / Q000502:physiology; D008954:Models, Biological; D008956:Models, Chemical; D025941:Protein Interaction Mapping / Q000379:methods; D012441:Saccharomyces cerevisiae / Q000737:chemistry* / Q000378:metabolism*; D029701:Saccharomyces cerevisiae Proteins / Q000737:chemistry* / Q000378:metabolism*; D015398:Signal Transduction / Q000502:physiology*
D029701:Saccharomyces cerevisiae Proteins