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Related Experiment Videos

The CRIPTO/FRL-1/CRYPTIC (CFC) domain of human Cripto. Functional and structural insights through disulfide structure

Susan F Foley1, Herman W T van Vlijmen, Raymond E Boynton

  • 1Biogen, Inc., Cambridge Center, Cambridge, MA 02142, USA.

European Journal of Biochemistry
|August 16, 2003
PubMed
Summary

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The study determined the disulfide structure of the Cripto protein

Area of Science:

  • Biochemistry
  • Structural Biology
  • Molecular Biology

Background:

  • Cripto protein plays a role in embryonic development and cancer.
  • The CRIPTO/FRL-1/CRYPTIC (CFC) domain is crucial for Cripto's function.
  • Understanding the structural basis of Cripto interactions is essential.

Purpose of the Study:

  • To elucidate the disulfide bond pattern within the CFC domain of human Cripto.
  • To investigate the structural homology of Cripto's EGF-CFC domains.
  • To analyze the interaction between the CFC domain and ALK4.

Main Methods:

  • Enzymatic and chemical fragmentation of Cripto protein.
  • Chromatographic separation and mass spectrometry.
  • N-terminal sequencing, protein database searching, molecular modeling, and fluorescence-activated cell sorter analysis.

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Main Results:

  • Identified three disulfide bonds: Cys115-Cys133, Cys128-Cys149, and Cys131-Cys140.
  • The disulfide linkage pattern is conserved with PARS intercerebralis major Peptide C (PMP-C).
  • The CFC domain binds to ALK4 independently of the EGF domain and possesses a hydrophobic patch.

Conclusions:

  • The determined disulfide structure provides insights into the CFC domain's stability and function.
  • Structural homology suggests conserved functions across related proteins.
  • The identified hydrophobic patch may mediate protein-protein interactions crucial for Cripto signaling.