Cancer Institute A national cancer institute
designated cancer center

Roeland Nusse

Publication Details

  • Pathway specificity by the bifunctional receptor frizzled is determined by affinity for wingless MOLECULAR CELL Rulifson, E. J., Wu, C. H., Nusse, R. 2000; 6 (1): 117-126


    The Frizzled (Fz) protein in Drosophila is a bifunctional receptor that acts through a GTPase pathway in planar polarity signaling and as a receptor for Wingless (Wg) using the canonical Wnt pathway. We found that the ligand-binding domain (CRD) of Fz has an approximately 10-fold lower affinity for Wg than the CRD of DFz2, a Wg receptor without polarity activity. When the Fz CRD is replaced by the high-affinity CRD of DFz2, the resulting chimeric protein gains Wg signaling activity, yet also retains polarity signaling activity. In contrast, the reciprocal exchange of the Fz CRD onto DFz2 is not sufficient to confer polarity activity to DFz2. This suggests that Fz has an intrinsic capacity for polarity signaling and that high-affinity interaction with Wg couples it to the Wnt pathway.

    View details for Web of Science ID 000088799400012

    View details for PubMedID 10949033

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