FZD1

Members of the 'frizzled' gene family encode 7-transmembrane domain proteins that are receptors for Wnt signaling proteins. The FZD1 protein contains a signal peptide, a cysteine-rich domain in the N-terminal extracellular region, 7 transmembrane domains, and a C-terminal PDZ domain-binding motif. The FZD1 transcript is expressed in various tissues. [provided by RefSeq, Jul 2008]

Frizzled Class Receptor 1

Receptor for Wnt proteins (PubMed:10557084).

Activated by WNT3A, WNT3, WNT1 and to a lesser extent WNT2, but apparently not by WNT4, WNT5A, WNT5B, WNT6, WNT7A or WNT7B (PubMed:10557084).

Contradictory results showing activation by WNT7B have been described for mouse (By similarity).

Functions in the canonical Wnt/beta-catenin signaling pathway (PubMed:10557084).

The canonical Wnt/beta-catenin signaling pathway leads to the activation of disheveled proteins, inhibition of GSK-3 kinase, nuclear accumulation of beta-catenin and activation of Wnt target genes (PubMed:10557084).

A second signaling pathway involving PKC and calcium fluxes has been seen for some family members, but it is not yet clear if it represents a distinct pathway or if it can be integrated in the canonical pathway, as PKC seems to be required for Wnt-mediated inactivation of GSK-3 kinase. Both pathways seem to involve interactions with G-proteins. May be involved in transduction and intercellular transmission of polarity information during tissue morphogenesis and/or in differentiated tissues (Probable).

(Microbial infection) Acts as a receptor for C.difficile toxin TcdB in the colonic epithelium.

Autocrine signaling Source: BHF-UCL
Canonical Wnt signaling pathway Source: UniProtKB
Canonical Wnt signaling pathway involved in mesenchymal stem cell differentiation Source: BHF-UCL
Canonical Wnt signaling pathway involved in osteoblast differentiation Source: BHF-UCL
Cell-cell signaling Source: BHF-UCL
Neuron differentiation Source: UniProtKB
Positive regulation of DNA-binding transcription factor activity Source: BHF-UCL
Positive regulation of neuron projection development Source: ARUK-UCL
Positive regulation of transcription, DNA-templated Source: BHF-UCL
Presynapse assembly Source: ParkinsonsUK-UCL
Response to drug Source: BHF-UCL
Wnt signaling pathway involved in midbrain dopaminergic neuron differentiation Source: ParkinsonsUK-UCL

Cell membrane

Extracellular: 73-322
Helical: 323-343
Cytoplasmic: 344-354
Helical: 355-375
Extracellular: 376-402
Helical: 403-423
Cytoplasmic: 424-445
Helical: 446-466
Extracellular: 467-489
Helical: 490-510
Cytoplasmic: 511-536
Helical: 537-557
Extracellular: 558-601
Helical: 602-622
Cytoplasmic: 623-647

Ubiquitinated by ZNRF3, leading to its degradation by the proteasome.