Recombinant Human RNF43-Fc Chimera (carrier-free)

Pricing & Availability
Regulatory Status
Other Names
Ring Finger Protein 43, E3 ubiquitin-protein ligase RNF43, RNF124
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Product Citations
When human R-Spondin 3 is immobilized at 0.5 µg/mL, human RNF43 binds in a dose dependent manner with EC50 of 20 – 80 ng/mL.
  • Human_RNF43-Fc-Chimera_CF_1_020618
    When human R-Spondin 3 is immobilized at 0.5 µg/mL, human RNF43 binds in a dose dependent manner with EC50 of 20 – 80 ng/mL.
  • Human_RNF43-Fc-Chimera_CF_2_020618
    Stability testing for human RNF43. Human RNF43 was aliquoted in PBS, pH 7.2 at 0.2 mg/ml. One aliquot was freeze and thawed four times (4x freeze/thaws), and compared to a control kept at 4°C (control). The samples were tested in a binding assay with human R-Spondin 3.
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771208 500 µg 1000,00€
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771202 10 µg 64,00€
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771204 25 µg 132,00€
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771206 100 µg 420,00€
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RNF43 (Ring Finger Protein 43) is a RING-type E3 ubiquitin ligase that contains 783 amino acid with 174 amino acid extracellular domain, a transmembrane domain, and a cytoplasmic RING domain. RNF43 negatively regulate Wnt signaling by promoting turnover of Frizzled receptors.  The RNF43 expression results in an increase in ubiquitination of Frizzled receptors and alteration in their subcellular distribution, resulting in reduced surface levels of Frizzled receptors. RNF43 mediated turnover of Frizzled receptors is inhibited by R-Spondin. RNF43 acts on both canonical and non-canonical Wnt signaling pathway. RNF43 is expressed in stem cells at the bottom of intestinal crypts where it acts as a tumor suppressor by inhibiting the Wnt signaling pathway, thereby restricting the size of the intestinal stem cell zone. Mutations in RNF43 gene have been reported in multiple tumor cells, including colorectal and endometrial cancers. Diseases associated with RNF43 include Sessile Serrated Polyposis Cancer Syndrome and Hyperplastic Polyposis Syndrome.

Product Details
Technical Data Sheet (pdf)

Product Details

Human RNF43, amino acids Glu43-Val199 (Accession # Q68DV7) with a C-terminal human IgG1 Fc tag was expressed in CHO cells.
Molecular Mass
The 415 amino acid recombinant protein has a predicted molecular mass of approximately 46.2 kD. The DTT-reduced protein migrates at approximately 55 kD and and non-reduced protein migrates at approximately 110 kD by SDS-PAGE. The predicted N-terminal amino acid is Glu.
>95%, as determined by Coomassie stained SDS-PAGE.
0.22 µm filtered protein solution is in PBS, pH 7.2
Endotoxin Level
Less than 0.1 EU per µg protein as determined by the LAL method.
10 and 25 µg sizes are bottled at 200 µg/mL. 100 µg and larger sizes are lot-specific and bottled at the concentration indicated on the vial (please contact technical support for concentration, or use our Lookup tool if you have a lot number.)
Storage & Handling
Unopened vial can be stored between 2°C and 8°C for up to 2 weeks, at -20°C for up to six months, or at -70°C or colder until the expiration date. For maximum results, quick spin vial prior to opening. The protein can be aliquoted and stored at -20°C or colder. Stock solutions can also be prepared at 50 - 100 µg/mL in appropriate sterile buffer, carrier protein such as 0.2 - 1% BSA or HSA can be added when preparing the stock solution. Aliquots can be stored between 2°C and 8°C for up to one week and stored at -20°C or colder for up to 3 months. Avoid repeated freeze/thaw cycles.
When human R-Spondin 3 is immobilized at 0.5 µg/mL, human RNF43 binds with EC50 of 20 – 80 ng/mL.


Application Notes

BioLegend carrier-free recombinant proteins provided in liquid format are shipped on blue-ice. Our comparison testing data indicates that when handled and stored as recommended, the liquid format has equal or better stability and shelf-life compared to commercially available lyophilized proteins after reconstitution. Our liquid proteins are verified in-house to maintain activity after shipping on blue ice and are backed by our 100% satisfaction guarantee. If you have any concerns, contact us at

Antigen Details


Intestinal stem cells, fetal kidney, fetal lung

E3 ubiquitin-protein ligase that acts as a negative regulator of the Wnt signaling pathway
R-Spondin 3
Measured by its ability to bind human R-Spondin 3
Molecular Family
Enzymes and Regulators, Soluble Receptors
Antigen References
  1. Sugiura T, et al. 2008. Exp Cell Res. 314:1519-1528
  2. Yagyu R, et al. 2004. Int J Oncol. 25:1343-1348
  3. Hao HX, et al. 2012. Nature. 485:195-200
  4. Koo BK, et al. 2012. Nature. 488:665-669
  5. Giannakis M, et al. 2014. Nature Genet. 46:1264-1266
  6. Jing X, et al. 2015. Mol Cell. 58:522-533
Gene ID
54894 View all products for this Gene ID
View information about RNF43 on

Related FAQs

Why choose BioLegend recombinant proteins?

     • Each lot of product is quality-tested for bioactivity as indicated on the data sheet.
     • Greater than 95% Purity or higher, tested on every lot of product.
     • 100% Satisfaction Guarantee for quality performance, stability, and consistency.
     • Ready-to-use liquid format saves time and reduces challenges associated with reconstitution.
     • Bulk and customization available. Contact us.
     • Learn more about our Recombinant Proteins.

How does the activity of your recombinant proteins compare to competitors?

We quality control each and every lot of recombinant protein. Not only do we check its bioactivity, but we also compare it against other commercially available recombinant proteins. We make sure each recombinant protein’s activity is at least as good as or better than the competition’s. In order to provide you with the best possible product, we ensure that our testing process is rigorous and thorough. If you’re curious and eager to make the switch to BioLegend recombinants, contact your sales representative today!

What is the specific activity or ED50 of my recombinant protein?

The specific activity range of the protein is indicated on the product datasheets. Because the exact activity values on a per unit basis can largely fluctuate depending on a number of factors, including the nature of the assay, cell density, age of cells/passage number, culture media used, and end user technique, the specific activity is best defined as a range and we guarantee the specific activity of all our lots will be within the range indicated on the datasheet. Please note this only applies to recombinants labeled for use in bioassays. ELISA standard recombinant proteins are not recommended for bioassay usage as they are not tested for these applications.

Have your recombinants been tested for stability?

Our testing shows that the recombinant proteins are able to withstand room temperature for a week without losing activity. In addition the recombinant proteins were also found to withstand four cycles of freeze and thaw without losing activity.

Does specific activity of a recombinant protein vary between lots?

Specific activity will vary for each lot and for the type of experiment that is done to validate it, but all passed lots will have activity within the established ED50 range for the product and we guarantee that our products will have lot-to-lot consistency. Please conduct an experiment-specific validation to find the optimal ED50 for your system.

How do you convert activity as an ED50 in ng/ml to a specific activity in Units/mg?
Use formula Specific activity (Units/mg) = 10e6/ ED50 (ng/mL)
Go To Top Version: 2    Revision Date: 07.13.2020

For research use only. Not for diagnostic use. Not for resale. BioLegend will not be held responsible for patent infringement or other violations that may occur with the use of our products.


*These products may be covered by one or more Limited Use Label Licenses (see the BioLegend Catalog or our website, BioLegend products may not be transferred to third parties, resold, modified for resale, or used to manufacture commercial products, reverse engineer functionally similar materials, or to provide a service to third parties without written approval of BioLegend. By use of these products you accept the terms and conditions of all applicable Limited Use Label Licenses. Unless otherwise indicated, these products are for research use only and are not intended for human or animal diagnostic, therapeutic or commercial use.


BioLegend Inc., 8999 BioLegend Way, San Diego, CA 92121
Toll-Free Phone: 1-877-Bio-Legend (246-5343) Phone: (858) 768-5800 Fax: (877) 455-9587

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