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Structural characterization of 14-3-3ζ in complex with the human Son of sevenless homolog 1 (SOS1)

Alice Ballone1, Federica Centorrino1, Madita Wolter1

  • 1Laboratory of Chemical Biology, Department of Biomedical Engineering and Institute for Molecular Systems, Eindhoven University of Technology, Eindhoven 5600 MB, The Netherlands.

Journal of Structural Biology
|February 7, 2018
PubMed

Insights

Aberrant Ras signaling, common in cancer, involves SOS1. This study details the 14-3-3/SOS1 protein interaction structure, offering a new target for cancer therapy development.

Area of Science:

  • Oncology
  • Molecular Biology
  • Structural Biology

Background:

  • Aberrant Ras activation is implicated in ~30% of human cancers.
  • SOS1 is a key regulator of the Ras-MAPK pathway, controlling cell proliferation and differentiation.
  • 14-3-3 proteins interact with SOS1, modulating its activity in Ras signaling.

Purpose of the Study:

  • To investigate the protein-protein interaction (PPI) between 14-3-3 and SOS1.
  • To elucidate the structural basis of the 14-3-3/SOS1 complex.
  • To explore the potential of targeting this interaction for cancer therapy.

Main Methods:

  • Biochemical assays to study protein-protein interactions.
  • High-resolution crystal structure determination of the SOS1-14-3-3ζ complex.
  • Bioinformatic analysis of the interaction interface.

Main Results:

  • Detailed biochemical characterization of the 14-3-3/SOS1 PPI.
  • Determination of the high-resolution crystal structure of a 13-mer SOS1 motif bound to 14-3-3ζ.
  • Identification of key structural features of the interaction interface.

Conclusions:

  • The structural and functional insights into the 14-3-3/SOS1 interaction provide a basis for drug development.
  • Targeting this PPI interface could offer a novel strategy for modulating the Ras-Raf-MAPK pathway in cancer.
  • This research opens new avenues for small-molecule stabilization approaches to cancer therapy.
Keywords:
Differential scanning fluorimetryFluorescence polarizationIsothermal titration calorimetrySon of sevenless homolog 1X-ray crystallography

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