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J Biol Chem. 2001 Oct 12;276(41):37769-78. Epub 2001 Aug 10.

Fucosylation of Cripto is required for its ability to facilitate nodal signaling.

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  • 1Biogen, Inc., Cambridge, Massachusetts 02142, USA.

Abstract

O-linked fucose modification is rare and has been shown to occur almost exclusively within epidermal growth factor (EGF)-like modules. We have found that the EGF-CFC family member human Cripto-1 (CR) is modified with fucose and through a combination of peptide mapping, mass spectrometry, and sequence analysis localized the site of attachment to Thr-88. The identification of a fucose modification on human CR within its EGF-like domain and the presence of a consensus fucosylation site within all EGF-CFC family members suggest that this is a biologically important modification in CR, which functionally distinguishes it from the EGF ligands that bind the type 1 erbB growth factor receptors. A single CR point mutation, Thr-88 --> Ala, results in a form of the protein that is not fucosylated and has substantially weaker activity in cell-based CR/Nodal signaling assays, indicating that fucosylation is functionally important for CR to facilitate Nodal signaling.

PMID:
11500501
[PubMed - indexed for MEDLINE]
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