Recombinant Mouse Dkk-1 (Histidine-tagged) Protein

Catalog # 1765-DK | R&D Systems, Inc. a Bio-Techne Brand
A New and Improved rm Dkk-1 is Available! It has a lower endotoxin specification, ~5 fold better activity, and no tag!
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Carrier Free
1765-DK-010/CF
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1765-DK-010
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Key Product Details

Accession #

O54908

Source

NS0

Conjugate

Unconjugated

Applications

Bioactivity

Product Specifications

Source

Mouse myeloma cell line, NS0-derived mouse Dkk-1 protein
Ser30-His272, with a C-terminal 10-His tag

Purity

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

Endotoxin Level

<1.0 EU per 1 μg of the protein by the LAL method.

N-terminal Sequence Analysis

Ser30

Predicted Molecular Mass

27.6 kDa

SDS-PAGE

38 kDa and 41 kDa, reducing conditions

Activity

Measured by its ability to inhibit Wnt induced TCF reporter activity in HEK293 human embryonic kidney cells.
Recombinant Mouse Dkk-1 inhibits a constant dose of 100 ng/mL of Recombinant Mouse Wnt-3a (Catalog # 1324-WN). The ED50 for this effect is 30-180 ng/mL.

Scientific Data Images for Recombinant Mouse Dkk-1 (Histidine-tagged) Protein

Recombinant Mouse Dkk-1 (Histidine-tagged) Protein Bioactivity

Recombinant Mouse Dkk-1 (Histidine-tagged) Protein Bioactivity

Recombinant Mouse Wnt-3a (Catalog # 1324-WN) induces a dose responsive increase in Wnt reporter activity in HEK293 cells (green circles). Recombinant Mouse Dkk-1 (Catalog # 1765-DK) inhibits a constant dose of 100 ng/mL of Recombinant Mouse Wnt-3a. The ED50 for this effect is 30-180 ng/mL (orange circles).

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: 1765-DK
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 containing at least 0.1% human or bovine serum albumin.
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.
Carrier Free: 1765-DK/CF
Formulation Lyophilized from a 0.2 μm filtered solution in PBS with Trehalose.
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.
  • 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: Dkk-1

Dickkopf related protein 1 (Dkk-1) is the founding member of the Dickkopf family of proteins that includes Dkk-1, -2, -3, -4, and a related protein, Soggy (1, 2). Dkk proteins are secreted proteins that contain two conserved cysteine-rich domains separated by a linker region. Each domain contains ten cysteine residues (1-3). Mature mouse Dkk-1 is a 40 kDa glycosylated protein that shares 86%, 96%, 83% and 82% amino acid (aa) sequence identity with human, rat, rabbit and bovine Dkk‑1, respectively. It also shares 41% and 36% aa identity with human Dkk-2 and Dkk-4, respectively. Dkk-1 and Dkk-4 are well documented antagonists of the canonical Wnt signaling pathway (1, 2). This pathway is activated by Wnt engagement of a receptor complex composed of the Frizzled proteins and one of two low‑density lipoprotein receptor-related proteins, LRP5 or LRP6 (4). Dkk-1 antagonizes Wnt by forming ternary complexes of LRP5/6 with Kremen1 or Kremen2 (4, 5). Dkk-1/LRP6/Krm2 complex internalization has been shown to downregulate Wnt signaling (4, 5). Dkk-1 is expressed throughout development and antagonizes Wnt-7a during limb development (6, 7). Other sites of expression include developing neurons, hair follicles and the retina of the eye (8, 9). The balance between Wnt signaling and Dkk-1 inhibition is critical for bone formation and homeostasis (10). Insufficient or excess Dkk-1 activity in bone results in increased or decreased bone density, respectively (8, 11). In adults, Dkk-1 is expressed in osteoblasts and osteocytes, and neurons. Cerebral ischemia induces Dkk-1 expression, which contributes to neuronal cell death (12).

References

  1. Glinka, A. et al. (1998) Nature 391:357.  
  2. Niehrs, C. (2006) Oncogene 25:7469. 
  3. Bullock, C.M. et al. (2004) Mol. Pharmacol. 65:582. 
  4. Mao, B. et al. (2001) Nature 411:321. 
  5. Mao, B. et al. (2002) Nature 417:664.  
  6. Kemp, C. et al. (2005) Dev. Dyn. 233:1064.
  7. Adamska, M. et al. (2004) Dev. Biol. 272:134.
  8. Li, J. et al. (2006) Bone 36:754.
  9. Verani, R. et al. (2006) J. Neurochem. 101:242.
  10. Pinzone, J.J. et al. (2009) Blood 113:517.
  11. Morvan, F. et al. (2006) J. Bone Miner. Res. 21:934.
  12. Cappuccio, I. et al. (2005) J. Neurosci. 25:2647.

Long Name

Dickkopf-1

Alternate Names

Dkk1

Entrez Gene IDs

22943 (Human); 13380 (Mouse); 102123735 (Cynomolgus Monkey)

Gene Symbol

DKK1

UniProt

O54908

Product Documents for Recombinant Mouse Dkk-1 (Histidine-tagged) Protein

Certificate of Analysis

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Note: Certificate of Analysis not available for kit components.

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Product Specific Notices for Recombinant Mouse Dkk-1 (Histidine-tagged) Protein

For research use only

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