Recombinant Mouse Siglec-15 His-tag Protein, CF

Catalog # Availability Size / Price Qty
Recombinant Mouse Siglec-15 His-tag Protein Bioactivity
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Product Details

Recombinant Mouse Siglec-15 His-tag Protein, CF Summary

>95%, by SDS-PAGE visualized with Silver Staining and quantitative densitometry by Coomassie® Blue Staining.
Endotoxin Level
<0.10 EU per 1 μg of the protein by the LAL method.
Measured by its ability to inhibit IL-2 secretion by mouse T cells in the presence of anti-CD3. The ED50 for this effect is 0.075‑0.75 μg/mL.
Mouse myeloma cell line, NS0-derived mouse Siglec-15 protein
Arg24-Tyr250, with a C-terminal 6-His tag
N-terminal Sequence
Predicted Molecular Mass
25 kDa
30-45 kDa, under reducing conditions

Product Datasheets

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.


Formulation Lyophilized from a 0.2 μm filtered solution in PBS.
Reconstitution Reconstitute at 200 μg/mL in 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.

Data Images

Bioactivity Recombinant Mouse Siglec-15 His-tag Protein Bioactivity View Larger

Recombinant Mouse Siglec-15 His-tag (Catalog # 10288-SL) inhibits IL-2 secretion by mouse T cells in the presence of Rat Anti-Mouse CD3 Monoclonal Antibody (Catalog # MAB4841). The ED50for this effect is 0.075-0.75 µg/mL.

SDS-PAGE Recombinant Mouse Siglec-15 His-tag Protein SDS-PAGE View Larger

2 μg/lane of Recombinant Mouse Siglec-15 His-tag (Catalog # 10288-SL) was resolved with SDS-PAGE under reducing (R) and non-reducing (NR) conditions and visualized by Coomassie® Blue staining, showing bands at 30-45 kDa.

Reconstitution Calculator

Reconstitution Calculator

The reconstitution calculator allows you to quickly calculate the volume of a reagent to reconstitute your vial. Simply enter the mass of reagent and the target concentration and the calculator will determine the rest.


Background: Siglec-15

Siglec-15 is a transmembrane glycoprotein in the Siglec family of sialic acid-binding immune regulatory molecules (1). Mature mouse Siglec-15 consists of a 239 amino acid (aa) extracellular domain (ECD) with two Ig-like domains, a 21 aa transmembrane segment, and a 59 aa cytoplasmic domain. Within the ECD, mouse Siglec-15 shares 85% and 92% aa sequence identity with human and rat Siglec-15, respectively. In human Siglec-15, alternative splicing generates an additional isoform that lacks the signal peptide and first Ig-like domain. Siglec-15 associates with the signaling molecules DAP12 and DAP10 (2-5). It is expressed on osteoclasts, macrophages, and dendritic cells (2-6) and binds to the sialyl-Tn antigen (2, 3, 6). This interaction induces the production of TGF-beta by tumor-associated macrophages (3). Siglec-15 function is important for osteoclast formation and TRANCE/RANK Ligand signaling in osteoclasts (4-6). Siglec-15 is broadly upregulated on human cancer cells and tumor infiltrating myeloid cells (7). Siglec-15 suppresses antigen-specific T cell responses in vitro and in vivo therefore it is considered to be an immune suppressor and potential target for normalization cancer immunotherapy (7).

  1. Humphrey, M.B. and M.C. Nakamura (2016) Clin. Rev. Allergy Immunol. 51:48.
  2. Angata, T. et al. (2007) Glycobiology 17:838.
  3. Takamiya, R. et al. (2013) Glycobiology 23:178.
  4. Kameda, Y. et al. (2013) J. Bone Miner. Res. 28:2463.
  5. Stuible, M. et al. (2014) J. Biol. Chem. 289:6498.
  6. Ishida-Kitagawa, N. et al. (2012) J. Biol. Chem. 287:17493.
  7. Wang, J. et al. (2019) Nat. med. 25:656.
Long Name
Sialic Acid Binding Ig-like Lectin 15
Entrez Gene IDs
284266 (Human); 620235 (Mouse); 498888 (Rat)
Alternate Names
CD33 antigen-like 3SIGLEC-15; CD33 molecule-like 3; CD33L3; HsT1361; sialic acid binding Ig-like lectin 15; sialic acid-binding Ig-like lectin 15; Siglec15; Siglec-15


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