ZFIN ID: ZDB-PUB-110131-13
Rack1 is required for Vangl2 membrane localization and planar cell polarity signaling while attenuating canonical Wnt activity
Li, S., Esterberg, R., Lachance, V., Ren, D., Radde-Gallwitz, K., Chi, F., Parent, J.L., Fritz, A., and Chen, P.
Date: 2011
Source: Proceedings of the National Academy of Sciences of the United States of America   108(6): 2264-2269 (Journal)
Registered Authors: Fritz, Andreas
Keywords: none
MeSH Terms:
  • Animals
  • Cell Division/physiology
  • Cell Membrane/genetics
  • Cell Membrane/metabolism
  • Cell Polarity/physiology*
  • Gastrula/cytology
  • Gastrula/metabolism*
  • Gastrulation/physiology*
  • Membrane Proteins/genetics
  • Membrane Proteins/metabolism*
  • Mice
  • Protein Structure, Tertiary
  • Protein Transport/physiology
  • Receptors, Cell Surface/genetics
  • Receptors, Cell Surface/metabolism*
  • Signal Transduction/physiology*
  • Wnt Proteins/genetics
  • Wnt Proteins/metabolism*
  • Zebrafish/embryology*
  • Zebrafish/genetics
  • Zebrafish Proteins/genetics
  • Zebrafish Proteins/metabolism*
PubMed: 21262816 Full text @ Proc. Natl. Acad. Sci. USA
The vertebrate planar cell polarity (PCP) pathway shares molecular components with the β-catenin-mediated canonical Wnt pathway but acts through membrane complexes containing Vang or Frizzled to orient neighboring cells coordinately. The molecular interactions underlying the action of Vang in PCP signaling and specification, however, are yet to be delineated. Here, we report the identification of Rack1 as an interacting protein of a vertebrate Vang protein, Vangl2. We demonstrate that Rack1 is required in zebrafish for PCP-regulated processes, including oriented cell division, cellular polarization, and convergent extension during gastrulation. We further show that the knockdown of Rack1 affects membrane localization of Vangl2 and that the Vangl2-interacting domain of Rack1 has a dominant-negative effect on Vangl2 localization and gastrulation. Moreover, Rack1 antagonizes canonical Wnt signaling. Together, our data suggest that Rack1 regulates the localization of an essential PCP protein and acts as a molecular switch to promote PCP signaling.