Propagation of large concentration changes in reversible protein-binding networks

Sergei Maslov, I. Ispolatov

Research output: Contribution to journalArticlepeer-review


We study how the dynamic equilibrium of the reversible protein-protein- binding network in yeast Saccharomyces cerevisiae responds to large changes in abundances of individual proteins. The magnitude of shifts between free and bound concentrations of their immediate and more distant neighbors in the network is influenced by such factors as the network topology, the distribution of protein concentrations among its nodes, and the average binding strength. Our primary conclusion is that, on average, the effects of a perturbation are strongly localized and exponentially decay with the network distance away from the perturbed node, which explains why, despite globally connected topology, individual functional modules in such networks are able to operate fairly independently. We also found that under specific favorable conditions, realized in a significant number of paths in the yeast network, concentration perturbations can selectively propagate over considerable network distances (up to four steps). Such "action-at-a-distance" requires high concentrations of heterodimers along the path as well as low free (unbound) concentration of intermediate proteins.

Original languageEnglish (US)
Pages (from-to)13655-13660
Number of pages6
JournalProceedings of the National Academy of Sciences of the United States of America
Issue number34
StatePublished - Aug 21 2007
Externally publishedYes


  • Binding equilibrium
  • Dissociation constant
  • Genetic interactions
  • Law of mass action
  • Small-world networks

ASJC Scopus subject areas

  • General


Dive into the research topics of 'Propagation of large concentration changes in reversible protein-binding networks'. Together they form a unique fingerprint.

Cite this