Dickkopf proteins are secreted antagonists of the Wnt cell signalling molec
ules, which have a novel mode of action. Dickkopf1 binds to the LRP5/6 Wnt
co-receptor and prevents the formation of active Wnt-Frizzled-LRP5/6 recept
or complexes, thus blocking the canonical Wnt-beta -catenin pathway.