Kremen (Kringle-containing protein marking the eye and the nose) proteins are type I transmembrane proteins that contain extracellular kringle, WSC and CUB domains and an intracellular region without any conserved motifs (1). Two related members, Kremen-1 and -2, have been identified. Kremens bind a subset of the secreted Dickkopf (Dkk) proteins (Dkk-1, -2, and -4) with high affinity to modulate the canonical Wnt signaling pathway that is transduced by the ternary receptor complex composed of Wnt, the seven-transmembrane domain receptor Frizzled, and the LDL-receptor-related protein 5/6 (LRP5/6) coreceptor (2, 3). Within the Dkk family, Dkk-1 and -4 bind directly to the LRP5/6 coreceptor to antagonize the canonical Wnt/ beta -catenin signaling pathway, but not the planar cell polarity (PCP) signaling pathway that does not involve LRP5/6 (4). In contrast, Dkk-3 has no effect on Wnt signaling and Dkk-2 can function either as an LRP agonist or antagonist, depending on whether the cell expresses Kremen (5). Kremen cooperates with Dkk to antagonize Wnt signaling via formation of a Kremen-Dkk-LRP ternary complex that triggers the internalization and clearance of the complex from the cell surface (3). All three extracellular domains but not the cytoplasmic region of a membrane anchored Kremen are needed for binding to the second cysteine-rich domain of Dkks (3). Human Kremen-2 cDNA encodes a 462 amino acid (aa) glycosylated protein with a putative 18 aa signal peptide, a 353 aa extracellular domain, a 17 aa transmembrane domain and a 75 aa cytoplasmic domain. In the extracellular domain, it shares 88% and 42% amino acid sequence identity with mouse Kremen-2 and human Kremen-1, respectively.
Key Product Details
- R&D Systems NS0-derived Recombinant Human Kremen-2 Protein (1946-KR)
- Quality control testing to verify active proteins with lot specific assays by in-house scientists
- All R&D Systems proteins are covered with a 100% guarantee
Source
Accession Number
Applications
Product Specifications
Source
Gln19-Ala364, with a C-terminal 10-His tag
Purity
Endotoxin Level
N-terminal Sequence Analysis
Predicted Molecular Mass
SDS-PAGE
Activity
Immobilized rhKremen-2/his at 4 µg/mL (100 µL/well) can bind rhDkk-1 with an apparent KD <10 nM.
Reviewed Applications
Read 3 reviews rated 5 using 1946-KR in the following applications:
Formulation, Preparation, and Storage
Carrier Free
What does CF mean?CF stands for Carrier Free (CF). We typically add Bovine Serum Albumin (BSA) as a carrier protein to our recombinant proteins. Adding a carrier protein enhances protein stability, increases shelf-life, and allows the recombinant protein to be stored at a more dilute concentration. The carrier free version does not contain BSA.
What formulation is right for me?In general, we advise purchasing the recombinant protein with BSA for use in cell or tissue culture, or as an ELISA standard. In contrast, the carrier free protein is recommended for applications, in which the presence of BSA could interfere.
Carrier: 1946-KR
| Formulation | Lyophilized from a 0.2 μm filtered solution in PBS with BSA as a carrier protein. |
| Reconstitution | Reconstitute at 100 μg/mL in sterile PBS. |
| 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.
|
Carrier Free: 1946-KR/CF
| Formulation | Lyophilized from a 0.2 μm filtered solution in PBS. |
| Reconstitution | Reconstitute at 100 μg/mL in sterile PBS. |
| 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.
|
Calculators
Background: Kremen-2
References
- Nakamura, T. et al. (2001) Biochim. Biophys. Acta 1518:63.
- Davidson G. et al. (2002) Development 129:5587.
- Mao, B. et al. (2002) Nature 417:664.
- Zorn, A.M. (2001) Curr. Biol. 11:R592.
- Mao, B. and C. Niehrs (2003) Gene 302:179.
Long Name
Alternate Names
Gene Symbol
UniProt
Additional Kremen-2 Products
Product Documents for Recombinant Human Kremen-2 Protein
Certificate of Analysis
To download a Certificate of Analysis, please enter a lot or batch number in the search box below.
Note: Certificate of Analysis not available for kit components.
Product Specific Notices for Recombinant Human Kremen-2 Protein
For research use only
Related Research Areas
Customer Reviews for Recombinant Human Kremen-2 Protein (3)
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Application: Binding assay/Protein-protein interactionVerified Customer | Posted 02/15/2021
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Application: Cell migration/motilityVerified Customer | Posted 12/02/2020
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Application: Media additive for protein or antibody productionVerified Customer | Posted 10/26/2020
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