Connectivity and expression in protein networks: proteins in a complex are uniformly expressed

Phys Rev E Stat Nonlin Soft Matter Phys. 2006 Mar;73(3 Pt 1):031909. doi: 10.1103/PhysRevE.73.031909. Epub 2006 Mar 14.


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.

Publication types

  • Research Support, Non-U.S. Gov't

MeSH terms

  • Computer Simulation
  • Gene Expression Regulation, Fungal / physiology
  • Models, Biological*
  • Models, Chemical*
  • Protein Interaction Mapping / methods
  • Saccharomyces cerevisiae / chemistry*
  • Saccharomyces cerevisiae / metabolism*
  • Saccharomyces cerevisiae Proteins / chemistry*
  • Saccharomyces cerevisiae Proteins / metabolism*
  • Signal Transduction / physiology*


  • Saccharomyces cerevisiae Proteins