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Structural insights into the interaction between the Cripto CFC domain and the ALK4 receptor.

Luisa Calvanese1, Angela Saporito, Romina Oliva

  • 1Dipartimento di Chimica, Università Federico II, Complesso Universitario MSA, via Cintia 45, 80126, Napoli, Italy.

Journal of Peptide Science : an Official Publication of the European Peptide Society
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PubMed
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Area of Science:

  • Biochemistry
  • Molecular Biology
  • Developmental Biology

Background:

  • Cripto, an extracellular EGF-CFC growth factor, is crucial in embryonic development and implicated in tumorigenesis.
  • Cripto is over-expressed in many tumors but minimally detected in normal tissues.
  • The CFC domain of Cripto plays a key role in its oncogenic activity by interfering with tumor-suppressive pathways.

Purpose of the Study:

  • To chemically synthesize and structurally characterize the human CFC Cripto domain.
  • To investigate the molecular basis of the interaction between the human CFC domain (h-CFC) and the ALK4 receptor.
  • To elucidate the role of specific residues in the h-CFC/ALK4 interaction.

Main Methods:

  • Chemical synthesis of the human CFC Cripto domain.
  • Nuclear Magnetic Resonance (NMR) spectroscopy for structural characterization.
  • Surface Plasmon Resonance (SPR) for binding studies.
  • Computational modeling, including molecular docking.

Main Results:

  • Synthetic h-CFC binds to the ALK4 receptor with a K(D) in the micro M range but not to ActRIIB.
  • NMR analysis revealed the h-CFC structure is stabilized by three disulfide bridges.
  • Key residues H120 and W124 are externally exposed, and a molecular model suggests their contribution to ALK4 binding.

Conclusions:

  • The CFC domain's structure and interaction with ALK4 provide insights into Cripto's role in tumorigenesis.
  • Understanding the h-CFC/ALK4 interaction mechanism can inform the development of targeted cancer therapies.
  • The study highlights the importance of the CFC domain in Cripto's oncogenic functions.