LDL-receptor-related protein 6 is a receptor for Dickkopf proteins

Bingyu Mao, Wei Wu, Yan Li, Dana Hoppe, Peter Stannek, Andrei Glinka and Christof Niehrs ()
Additional contact information
Bingyu Mao: Deutsches Krebsforschungszentrum
Wei Wu: Deutsches Krebsforschungszentrum
Yan Li: Deutsches Krebsforschungszentrum
Dana Hoppe: Deutsches Krebsforschungszentrum
Peter Stannek: Deutsches Krebsforschungszentrum
Andrei Glinka: Deutsches Krebsforschungszentrum
Christof Niehrs: Deutsches Krebsforschungszentrum

Nature, 2001, vol. 411, issue 6835, 321-325

Abstract: Abstract Wnt glycoproteins have been implicated in diverse processes during embryonic patterning in metazoa. They signal through frizzled-type seven-transmembrane-domain receptors to stabilize β-catenin1,2. Wnt signalling is antagonized by the extracellular Wnt inhibitor dickkopf1 (dkk1), which is a member of a multigene family3. dkk1 was initially identified as a head inducer in Xenopus embryos but the mechanism by which it blocks Wnt signalling is unknown. LDL-receptor-related protein 6 (LRP6) is required during Wnt/β-catenin signalling in Drosophila, Xenopus and mouse, possibly acting as a co-receptor for Wnt4,5,6. Here we show that LRP6 (ref. 7) is a specific, high-affinity receptor for Dkk1 and Dkk2. Dkk1 blocks LRP6-mediated Wnt/β-catenin signalling by interacting with domains that are distinct from those required for Wnt/Frizzled interaction. dkk1 and LRP6 interact antagonistically during embryonic head induction in Xenopus where LRP6 promotes the posteriorizing role of Wnt/β-catenin signalling. Thus, DKKs inhibit Wnt co-receptor function, exemplifying the modulation of LRP signalling by antagonists.

Date: 2001
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DOI: 10.1038/35077108

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