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Recombinant Mouse Frizzled-4 Fc Chimera Protein, CF

Catalog # 194-FZ | R&D Systems, Inc. a Bio-Techne Brand
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194-FZ-050

Key Product Details

Source

NS0

Accession #

Structure / Form

Disulfide-linked homodimer

Conjugate

Unconjugated

Applications

Binding Activity

Product Specifications

Source

Mouse myeloma cell line, NS0-derived mouse Frizzled-4 protein
Frizzled-4
(Phe37-Glu180)
Accession # Q8BLL2
IEGRMD Human IgG1
(Pro100-Lys330)
N-terminus C-terminus

Purity

>95%, by SDS-PAGE under reducing conditions and visualized by silver stain.

Endotoxin Level

<0.01 EU per 1 μg of the protein by the LAL method.

N-terminal Sequence Analysis

Phe37

Predicted Molecular Mass

43 kDa (monomer)

SDS-PAGE

50-55 kDa, reducing conditions

Activity

Measured by its ability to bind biotinylated rmWnt-5a in a functional ELISA with an estimated KD < 5 nM.

Formulation, Preparation and Storage

194-FZ
Formulation Lyophilized from a 0.2 μm filtered solution in PBS.
Reconstitution
Reconstitute at 100 μg/mL in sterile PBS.

Reconstitution Buffer Available:
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Shipping The product is shipped at ambient temperature. Upon receipt, store it immediately at the temperature recommended below.
Stability & Storage Use a manual defrost freezer and avoid repeated freeze-thaw cycles.
  • 12 months from date of receipt, -20 to -70 °C as supplied.
  • 1 month, 2 to 8 °C under sterile conditions after reconstitution.
  • 3 months, -20 to -70 °C under sterile conditions after reconstitution.

Background: Frizzled-4

Frizzled-4, designated CD344, is a 7-transmembrane glycoprotein of the Frizzled family within the G-protein coupled receptor superfamily (1, 2). Frizzled proteins function as receptors for Wnt proteins and can activate canonical Wnt/beta-catenin signaling as well as planar cell polarity and calcium flux pathways (1). Frizzled-4 is particularly important in angiogenic Wnt pathway signaling (1, 5). Frizzleds contain a divergent N-terminal signal peptide, a highly conserved ~120  amino acid (aa) cysteine-rich domain (CRD), a variable length linker region, seven transmembrane domains, and a variable-length C-terminal tail (1). The mouse Frizzled-4 cDNA encodes 537 aa with a 36 aa signal sequence and a 186 aa N-terminal extracellular sequence (4). The portion expressed includes aa 37-180, and shares 93%, 94%, 90%, 89% and 88% identity with human, rat, equine, bovine and canine Frizzled-4, respectively. This portion competes for Wnt binding with endogenous receptors. In humans, a 122 aa soluble form that diverges at aa 95 is proposed to be a positive regulator of Wnt signaling pathways (5). Frizzled-4 is unusual in binding a non-wnt ligand, Norrin, in addition to binding Wnt ligands (1, 3, 6). Norrin binds the Frizzled-4 CRD, activates Wnt signaling pathways and uses LRP5/6 as co-receptors (3, 6). Deletion of either Frizzled-4 or Norrin in mice results in a similar phenotype including malformation of vasculature in the retina, cerebellar degeneration, and loss of hair cells in the inner ear (1, 3, 7). In humans, blindness due to familial exudative vitreoretinopathy (FEVR) is associated with mutations producing loss of function of Frizzled-4 or Norrin, designated EVR1 and EVR2, respectively (1, 3, 8). Frizzled-4 expression has been found in many tissues, including mouse ovary, where it influences corpus luteum vasculogenesis and is necessary for fertility (4, 9).

References

  1. Huang, H-C. and P.S. Klein (2004) Genome Biol. 5:234.
  2. Parmalee, N.L. and J. Kitajewski (2008) Curr. Drug Targets 9:558.
  3. Xu, Q. et al. (2004) Cell 116:883.
  4. Wang, Y. et al. (1996) J. Biol. Chem. 271:4468.
  5. Sagara, N. et al. (2001) Biochem. Biophys. Res. Commun. 282:750.
  6. Smallwood, P.M. et al. (2007) J. Biol. Chem. 282:4057.
  7. Wang, Y. et al. (2001) J. Neurosci. 21:4761.
  8. Robitaille, J. et al. (2002) Nat. Genet. 32:326.
  9. Hsieh, M. et al. (2005) Biol. Reprod. 73:1135.

Alternate Names

CD344, Frizzled4, FZD4

Entrez Gene IDs

8322 (Human); 14366 (Mouse)

Gene Symbol

FZD4

UniProt

Product Documents for Recombinant Mouse Frizzled-4 Fc Chimera Protein, CF

Certificate of Analysis

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Product Specific Notices for Recombinant Mouse Frizzled-4 Fc Chimera Protein, CF

For research use only

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