Negative regulation of Wnt signaling mediated by CK1-phosphorylated Dishevelled via Ror2

FASEB J. 2010 Jul;24(7):2417-26. doi: 10.1096/fj.09-150615. Epub 2010 Mar 9.

Abstract

Dishevelled (Dvl) is a multifunctional effector of different Wnt cascades. Both canonical Wnt3a and noncanonical Wnt5a stimulate casein-kinase-1 (CK1) -mediated phosphorylation of Dvl, visualized as electrophoretic mobility shift [phosphorylated and shifted Dvl (ps-Dvl)]. However, the role of this phosphorylation remains obscure. Here we report the functional interaction of ps-Dvl with the receptor tyrosine kinase Ror2, which is an alternative Wnt receptor and is able to inhibit canonical Wnt signaling. We demonstrate interaction between Ror2 and ps-Dvl at the cell membrane after Wnt3a or Wnt5a stimulus dependent on CK1. Ps-Dvl interacts with the C-terminal proline-serine-threonine-rich domain of Ror2, which is required for efficient inhibition of canonical Wnt signaling. We further show that the Dvl C terminus, which seems to be exposed in ps-Dvl and efficiently binds Ror2, is an intrinsic negative regulator of the canonical Wnt pathway downstream of beta-catenin. The Dvl C terminus is necessary and sufficient to inhibit canonical Wnt/beta-catenin signaling, which is dependent on the presence of Ror2. Furthermore, both the Dvl C terminus and CK1epsilon can inhibit the Wnt5a/Ror2/ATF2 pathway in mammalian cells and Xenopus explant cultures. This suggests that phosphorylation of Dvl triggers negative feedback regulation for different branches of Wnt signaling in a Ror2-dependent manner.

Publication types

  • Research Support, Non-U.S. Gov't

MeSH terms

  • Adaptor Proteins, Signal Transducing / metabolism*
  • Animals
  • COS Cells
  • Casein Kinase I / metabolism*
  • Chlorocebus aethiops
  • Dishevelled Proteins
  • Feedback, Physiological*
  • Humans
  • Mice
  • Phosphoproteins / metabolism*
  • Phosphorylation
  • Receptor Tyrosine Kinase-like Orphan Receptors / metabolism*
  • Signal Transduction*
  • Wnt Proteins / metabolism*
  • Wnt-5a Protein
  • Wnt3 Protein
  • Wnt3A Protein
  • Xenopus
  • Xenopus Proteins

Substances

  • Adaptor Proteins, Signal Transducing
  • DVL1 protein, Xenopus
  • Dishevelled Proteins
  • Phosphoproteins
  • WNT3A protein, Xenopus
  • WNT3A protein, human
  • Wnt Proteins
  • Wnt-5a Protein
  • Wnt3 Protein
  • Wnt3A Protein
  • Wnt3a protein, mouse
  • Wnt5a protein, mouse
  • Xenopus Proteins
  • Receptor Tyrosine Kinase-like Orphan Receptors
  • Casein Kinase I