TAILIEUCHUNG - Báo cáo khoa học: The CRIPTO/FRL-1/CRYPTIC (CFC) domain of human Cripto Functional and structural insights through disulfide structure analysis

The disulfide structure of the CRIPTO/FRL-1/CRYPTIC (CFC) domain of human Cripto protein was determined by a combination of enzymatic and chemical fragmentation, followed by chromatographic separation of the fragments, and characterization by mass spectrometry and N-terminal sequencing. These studies showed that Cys115 forms a disulfide bond with Cys133, Cys128 with Cys149, and Cys131 with Cys140. | Eur. J. Biochem. 270 3610-3618 2003 FEBS 2003 doi The CRIPTO FRL-1 CRYPTIC CFC domain of human Cripto Functional and structural insights through disulfide structure analysis Susan F. Foley Herman W. T. van Vlijmen Raymond E. Boynton Heather B. Adkins Anne E. Cheung Juswinder Singh Michele Sanicola Carmen N. Young and Dingyi Wen Biogen Inc. Cambridge Center Cambridge MA USA The disulfide structure of the CRIPTO FRL-1 CRYPTIC CFC domain of human Cripto protein was determined by a combination of enzymatic and chemical fragmentation followed by chromatographic separation of the fragments and characterization by mass spectrometry and N-terminal sequencing. These studies showed that Cys115 forms a disulfide bond with Cys133 Cys128 with Cys149 and Cys131 with Cys140. Protein database searching and molecular modeling revealed that the pattern of disulfide linkages in the CFC domain of Cripto is the same as that in PARS intercerebralis major Peptide C PMP-C a serine protease inhibitor and that the EGF-CFC domains of Cripto are predicted to be structurally homologous to the EGF-VWFC domains of the C-terminal extracellular portions of Jagged 1 and Jagged 2. Biochemical studies of the interactions of ALK4 with the CFC domain of Cripto by fluorescence-activated cell sorter analysis indicate that the CFC domain binds to ALK4 independent of the EGF domain. A molecular model of the CFC domain of Cripto was constructed based on the nuclear magnetic resonance structure of PMP-C. This model reveals a hydrophobic patch in the domain opposite to the presumed ALK4 binding site. This hydrophobic patch may be functionally important for the formation of intra or intermolecular complexes. Keywords Cripto disufide structure CFC domain model. Cripto is a member of a family of proteins that includes human Cripto and Criptic murine Cripto and Criptic frog FRL-1 zebrafish one-eyed pinhead protein oep and chick Cripto 1-3 . The involvement of these proteins in .

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