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Cysteine-rich domain of the sizzled protein. The cysteine-rich domain (CRD) is an essential part of the sizzled protein, which regulates bone morphogenetic protein (Bmp) signaling by stabilizing chordin, and plays a critical role in the patterning of vertebrate and invertebrate embryos. Sizzled also functions in the ventral region as a Wnt inhibitor and modulates canonical Wnt signaling. Sizzled proteins belong to the secreted frizzled-related protein family (SFRP), and have be identified in the genomes of birds, fishes and frogs, but not mammals. |
Jiyao W et al.(2023). "The conserved domain database in 2023.",