Frizzled-3; Fz-3; hFz3 (FZD3)

Function

• receptor for Wnt proteins
• most of frizzled receptors are coupled to the beta-catenin canonical signaling pathway, which leads to the activation of disheveled proteins, inhibition of GSK-3 kinase, nuclear accumulation of beta-catenin & activation of Wnt target genes
• a second signaling pathway involving PKC & Ca+2 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 & intercellular transmission of polarity information during tissue morphogenesis &/or in differentiated tissues
• interacts with VANGL2 (putative)

Structure

• Lys-Thr-X-X-X-Trp motif is involved in the activation of the Wnt/beta-catenin signaling pathway (putative)
• FZ domain is involved in binding with Wnt ligands
• belongs to the G-protein coupled receptor Fz/smo family
• contains 1 FZ (frizzled) domain

Compartment

• membrane

Alternative splicing

• named isoforms=2; long, short

Expression

• widely expressed
• relatively high expression in
  • CNS, including regions of the limbic system,
  • kidney
  • pancreas
  • skeletal muscle
  • uterus
  • testis

More general terms

• frizzled homolog protein
• glycoprotein

Database

• Entrez gene: http://www.ncbi.nlm.nih.gov/sites/entrez?db=gene&cmd=Retrieve&dopt=Graphics&list_uids=7976
• Kegg: http://www.genome.jp/dbget-bin/www_bget?hsa:7976
• OMIM: https://mirror.omim.org/entry/606143
• UniProt: http://www.uniprot.org/uniprot/Q9NPG1.html