Members of the 'frizzled' gene family encode 7-transmembrane domain proteins that are receptors for Wnt signaling proteins. The FZD7 protein contains an N-terminal signal sequence, 10 cysteine residues typical of the cysteine-rich extracellular domain of Fz family members, 7 putative transmembrane domains, and an intracellular C-terminal tail with a PDZ domain-binding motif. FZD7 gene expression may downregulate APC function and enhance beta-catenin-mediated signals in poorly differentiated human esophageal carcinomas.[3]
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Struewing IT, Barnett CD, Zhang W, et al. (2007). "Frizzled-7 turnover at the plasma membrane is regulated by cell density and the Ca(2+) -dependent protease calpain-1". Exp. Cell Res. 313 (16): 3526–41. doi:10.1016/j.yexcr.2007.07.012. PMID17716656.