Kremen proteins are Dickkopf receptors that regulate Wnt/beta-catenin signalling.

Abstract:

:The Wnt family of secreted glycoproteins mediate cell cell interactions during cell growth and differentiation in both embryos and adults. Canonical Wnt signalling by way of the beta-catenin pathway is transduced by two receptor families. Frizzled proteins and lipoprotein-receptor-related proteins 5 and 6 (LRP5/6) bind Wnts and transmit their signal by stabilizing intracellular beta-catenin. Wnt/beta-catenin signalling is inhibited by the secreted protein Dickkopf1 (Dkk1), a member of a multigene family, which induces head formation in amphibian embryos. Dkk1 has been shown to inhibit Wnt signalling by binding to and antagonizing LRP5/6. Here we show that the transmembrane proteins Kremen1 and Kremen2 are high-affinity Dkk1 receptors that functionally cooperate with Dkk1 to block Wnt/beta-catenin signalling. Kremen2 forms a ternary complex with Dkk1 and LRP6, and induces rapid endocytosis and removal of the Wnt receptor LRP6 from the plasma membrane. The results indicate that Kremen1 and Kremen2 are components of a membrane complex modulating canonical Wnt signalling through LRP6 in vertebrates.

journal_name

Nature

journal_title

Nature

authors

Mao B,Wu W,Davidson G,Marhold J,Li M,Mechler BM,Delius H,Hoppe D,Stannek P,Walter C,Glinka A,Niehrs C

doi

10.1038/nature756

keywords:

subject

Has Abstract

pub_date

2002-06-06 00:00:00

pages

664-7

issue

6889

eissn

0028-0836

issn

1476-4687

pii

nature756

journal_volume

417

pub_type

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