Kremen protein 1 (KREMEN1)

Receptor for Dickkopf proteins.

Cooperates with DKK1/2 to inhibit Wnt/beta-catenin signaling by boosting the endocytosis of Wnt receptors LRP5 and LRP6.

In the absence of DKK1, potentiates Wnt-beta-catenin signaling by maintaining LRP5 or LRP6 at the cell membrane. Can activate apoptosis in a Wnt-independent fashion and this apoptotic activity is inhibited upon binding of the ligand DKK1.