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14-3-3 proteins regulate Tctp-Rheb interaction for organ growth in Drosophila

Thao Phuong Le1, Linh Thuong Vuong1, Ah-Ram Kim1

  • 1Department of Biological Sciences, Korea Advanced Institute of Science and Technology, 291 Daehak-ro, Yuseong-gu, Daejeon 305-701, Korea.

Nature Communications
|May 7, 2016
PubMed

Insights

14-3-3 proteins regulate Tor signaling by interacting with Tctp and Rheb in Drosophila. This interaction is crucial for tissue growth and organ development, revealing a new regulatory mechanism.

Area of Science:

  • Cellular signaling pathways
  • Molecular biology
  • Developmental biology

Background:

  • 14-3-3 proteins are crucial regulators of diverse signaling pathways.
  • Functional redundancy among 14-3-3 protein isotypes has limited understanding of their specific roles.
  • Tor signaling is a key pathway controlling cell growth and proliferation.

Purpose of the Study:

  • To investigate the role of 14-3-3 proteins in Tor signaling.
  • To elucidate the interaction between 14-3-3 proteins, Tctp, and Rheb.
  • To understand the impact of this interaction on Drosophila organ development and tissue growth.

Main Methods:

  • Genetic interaction studies in Drosophila.
  • Protein-protein interaction assays.
  • Analysis of signaling pathway components (e.g., phosphorylated S6 kinase, Thor/4E-BP, cyclin E).
  • Gene knockdown and overexpression experiments.

Main Results:

  • 14-3-3 proteins physically interact with Tctp and Rheb.
  • Knockdown of 14-3-3 isoforms disrupts Tctp-Rheb binding and impairs organ development.
  • Depletion of 14-3-3 proteins reduces key Tor pathway components and cyclin E levels.
  • Overexpression of cyclin E rescues growth defects caused by 14-3-3 and Tctp knockdown.

Conclusions:

  • 14-3-3 proteins mediate Tor signaling through interaction with Tctp and Rheb.
  • This interaction is essential for Drosophila tissue growth and organ development.
  • A novel mechanism for Tor pathway regulation involving 14-3-3 proteins is proposed.

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