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Solution structure and biophysical characterization of the multifaceted signalling effector protein growth arrest

Katja Rosti1, Adrian Goldman2,3, Tommi Kajander4

  • 1Institute of Biotechnology, Structural Biology and Biophysics, University of Helsinki, Helsinki, Finland. katja.rosti@helsinki.fi.

BMC Biochemistry
|April 19, 2015
PubMed
Abstract

Insights

Growth arrest specific-1 (GAS1) protein, a homolog of GFRαs, binds RET independently of neurotrophic factors. Structural analysis reveals GAS1 differs significantly from GFRαs in conformation and function.

Area of Science:

  • Biochemistry
  • Molecular Biology
  • Structural Biology

Background:

  • Growth arrest specific-1 (GAS1) inhibits cell proliferation and mediates cell death, acting as a tumor suppressor.
  • GAS1 signals via Rearranged during transformation (RET) and Patched-1 receptors, influencing stem cell renewal and neuronal survival.
  • Disruptions in Sonic Hedgehog and RET signaling pathways are linked to cancer progression.

Purpose of the Study:

  • To structurally characterize human GAS1 protein.
  • To compare GAS1's structure and function with glial cell-derived neurotrophic factor receptor alphas (GFRαs).
  • To investigate GAS1's interaction with the RET receptor.

Main Methods:

  • Production and purification of recombinant human GAS1 protein.
  • Static light scattering and small-angle X-ray scattering for solution structure analysis.
  • Homology modeling of individual domains.

Main Results:

  • GAS1 is a monomer in solution and exhibits a more elongated and flexible structure than GFRαs.
  • GAS1 domains lack amino acids for neurotrophic factor binding, differing from GFRαs.
  • GAS1 possesses a conserved extended N-terminal loop in vertebrates.

Conclusions:

  • GAS1 differs functionally from GFRαs due to distinct conformations and lack of neurotrophic factor binding sites.
  • GAS1 binds the extracellular RET receptor independently of neurotrophic factors, albeit with low affinity.
  • Structural differences underscore the functional divergence between GAS1 and GFRαs.

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