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Related Experiment Videos

High-betweenness proteins in the yeast protein interaction network.

Maliackal Poulo Joy1, Amy Brock, Donald E Ingber

  • 1Vascular Biology Program, Departments of Surgery and Pathology, Children's Hospital, Harvard Medical School, Boston, MA 02115, USA

Journal of Biomedicine & Biotechnology
|July 28, 2005
PubMed
Summary

High-betweenness, low-connectivity proteins in yeast networks suggest modular organization and link modules. These proteins are essential and evolutionarily older, with rewiring via mutation driving their production.

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Area of Science:

  • Systems Biology
  • Network Biology
  • Computational Biology

Background:

  • Biomolecular networks possess structural features absent in random networks, offering insights into cellular regulation and evolution.
  • Analyzing network topology, specifically node betweenness, is crucial for understanding complex biological systems.

Purpose of the Study:

  • To investigate the characteristics and significance of proteins with high betweenness and low connectivity (degree) in the yeast protein interaction network.
  • To explore the relationship between these proteins, network modularity, essentiality, and evolutionary age.
  • To determine the role of genome evolution models, particularly interaction rewiring, in generating such proteins.

Main Methods:

  • Graph theoretical analysis of the yeast protein interaction network, focusing on the 'betweenness' centrality measure.

Related Experiment Videos

  • Comparison of observed protein network features with predictions from scale-free network models.
  • Analysis of protein essentiality and evolutionary age in relation to betweenness and connectivity.
  • Evaluation of different genome evolution models, including mutation-driven rewiring.

    • Main Results:

    • Proteins with high betweenness and low connectivity are abundant in the yeast proteome, a finding not explained by standard scale-free network models.
    • These high-betweenness, low-connectivity proteins appear to link modules within the network.
    • Proteins with high betweenness are significantly more likely to be essential.
    • Evolutionary age of proteins is positively correlated with betweenness.
    • Mutation-driven rewiring of interactions is a key factor in the generation of these proteins.

    Conclusions:

    • The yeast protein interaction network exhibits a modular organization, with specific proteins acting as crucial inter-module connectors.
    • High-betweenness, low-connectivity proteins play a vital role in network function and evolution.
    • Understanding these network features provides insights into protein essentiality and evolutionary trajectories.