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An Integrative Analysis of the InR/PI3K/Akt Network Identifies the Dynamic Response to Insulin Signaling.

Arunachalam Vinayagam1, Meghana M Kulkarni1, Richelle Sopko1

  • 1Department of Genetics, Harvard Medical School, 77 Avenue Louis Pasteur, Boston, MA 02115, USA.

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This study maps the Drosophila insulin signaling network, revealing how numerous proteins interact and regulate pathway activity. It identifies key regulators like PP2A and Reptin-Pontin, offering a resource for studying this conserved pathway.

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Area of Science:

  • Cellular signaling pathways
  • Molecular biology
  • Systems biology

Background:

  • Insulin signaling is crucial for growth, proliferation, and metabolism.
  • Understanding the complex insulin pathway network is essential.

Purpose of the Study:

  • To construct a comprehensive Drosophila insulin receptor/phosphatidylinositol 3-kinase/Akt (InR/PI3K/Akt) network.
  • To characterize the structure and dynamics of this conserved signaling network.

Main Methods:

  • Integrated biochemical, genetic, and computational approaches.
  • Mapped dynamic protein-protein interactions (566 proteins).
  • Utilized RNAi screening, phospho-specific antibodies, and quantitative phosphoproteomics.

Main Results:

  • Identified 47% of interacting proteins affecting pathway activity.
  • Found ~10% of interacting proteins are regulated by insulin via phosphorylation.
  • Validated the method by identifying PP2A and Reptin-Pontin as regulators of ribosome biogenesis.

Conclusions:

  • The study provides a comprehensive resource for investigating the evolutionarily conserved insulin network.
  • Characterized the network's structure, dynamics, and key regulatory complexes.
  • Highlights the importance of protein complexes in insulin pathway regulation.