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Recombinant Human IL-15R alpha Fc Chimera Protein, CF

Bio-Techne includes R&D Systems | Catalog # 147-IR

Catalog #
Size / Price

Key Product Details


Sf 21 (baculovirus)

Accession #

Structure / Form

Disulfide-linked homodimer





Product Specifications


Spodoptera frugiperda, Sf 21 (baculovirus)-derived human IL-15 R alpha protein
Human IL-15 R alpha
Accession # EAW86418
6-His tag
N-terminus C-terminus


>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.

N-terminal Sequence Analysis


Predicted Molecular Mass

42.6 kDa (monomer)


51-64 kDa, reducing conditions


Measured by its ability to block human IL-15-induced proliferation of CTLL-2 mouse cytotoxic T cells. Ruchatz, H. et al. (1998) J. Immunol. 160:5654.
The ED50 for this effect is 0.005-0.015 µg/mL.

Formulation, Preparation and Storage

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

Reconstitution Buffer Available:
Size / Price
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: IL-15R alpha

Interleukin 15 Receptor alpha (IL‑15 R), also known as CD215, is a widely expressed 60 kDa transmembrane glycoprotein that plays an important role in the homeostasis and activation of NK cells and CD8+ memory T cells and participates in the development and function of many other hematopoietic cell types and non‑immune cell types (1 ‑ 3). Mature human IL‑15 R alpha consists of a 175 aa extracellular domain (ECD) containing one N‑linked glycosylation site, a 23 aa transmembrane segment, and a 39 aa cytoplasmic tail (4). Within the ECD, human IL‑15 R alpha shares approximately 60% aa sequence identity with mouse and rat IL‑15 R alpha. Alternate splicing of human IL‑15 R alpha generates additional isoforms with variable length deletions in the ECD and/or substitutions in the cytoplasmic domain (4, 5). IL‑15 R alpha binds to Interleukin‑15 with high affinity (6). IL‑15 additionally interacts with lower affinity to a complex of IL‑2 R beta and the common gamma chain ( gammac) which are also subunits of the IL‑2 receptor complex (7, 8). The use of shared receptor components contributes to the overlapping biological effects of IL‑15 and IL‑2. The dominant mechanism of IL‑15 action is known as transpresentation in which IL‑15/IL‑15 R alpha complexes are expressed on the surface of one cell and interact with complexes of IL‑2 R beta/ gammac on adjacent cells (9). This enables cells to respond to IL‑15 even if they do not express IL‑15 R alpha (10 ‑ 12). IL‑15/IL‑15 R alpha complexes can transmit reverse signaling that promotes cellular adhesion, tyrosine phosphorylation of intracellular proteins, and cytokine secretion by the IL‑15/IL‑15 R alpha expressing cells (13, 14). Shed soluble forms of IL‑15 R alpha retain the ability to bind tightly to IL‑15 and can inhibit IL‑15 bioactivity (6, 15, 16).


  1. Ma, A. et al. (2006) Annu. Rev. Immunol. 24:657.
  2. Di Sabatino, A. et al. (2011) Cytokine Growth Factor Rev. 22:19.
  3. Budagian, V. et al. (2006) Cytokine Growth Factor Rev. 17:259.
  4. Anderson, D.M. et al. (1995) J. Biol. Chem. 270:29862.
  5. Dubois, S. et al. (1999) J. Biol. Chem. 274:26978.
  6. Giri, J.G. et al. (1995) EMBO 14:3654.
  7. Grabstein, K. et al. (1994) Science 264:965.
  8. Giri, J. et al. (1994) EMBO J. 13:2822.
  9. Stonier, S.W. and K.S. Schluns (2010) Immunol. Lett. 127:85.
  10. Duitman, E.H. et al. (2008) Mol. Cell. Biol. 28:4851.
  11. Dubois, S. et al. (2002) Immunity 17:537.
  12. Burkett, P.R. et al. (2004) J. Exp. Med. 200:825.
  13. Budagian, V. et al. (2004) J. Biol. Chem. 279:42192.
  14. Neely, G.G. et al. (2004) J. Immunol. 172:4225.
  15. Budagian, V. et al. (2004) J. Biol. Chem. 279:40368.
  16. Mortier, E. et al. (2004) J. Immunol. 173:1681.

Long Name

Interleukin 15 Receptor alpha

Alternate Names

CD215, IL-15 R alpha, IL-15Ra, IL15 R alpha, IL15RA

Entrez Gene IDs

3601 (Human); 16169 (Mouse); 102121571 (Cynomolgus Monkey)

Gene Symbol



Additional IL-15R alpha Products

Product Documents for Recombinant Human IL-15R alpha Fc Chimera Protein, CF

Certificate of Analysis

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Note: Certificate of Analysis not available for kit components.

Product Specific Notices for Recombinant Human IL-15R alpha Fc Chimera Protein, CF

For research use only