Recombinant Human IL-18 R alpha/IL-1 R5 His-tag, CF

Catalog # Availability Size / Price Qty
Recombinant Human IL‑18 R alpha /IL‑1 R5 His-tag Protein Bioactivity.
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Product Details

Recombinant Human IL-18 R alpha/IL-1 R5 His-tag, CF Summary

Product Specifications

>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 the Recombinant Human IL-18/IL-1F4 Catalog # 9124-IL) induced response on KG-1 human acute myelogenous leukemia cells in the presence of Recombinant Human IL-18 R beta /IL-1 R7 Fc Chimera  (Catalog # 9124-IL). The ED50 for this effect is 0.400-4.00 μg/mL.

Chinese Hamster Ovary cell line, CHO-derived human IL-18 R alpha/IL-1 R5 protein
Glu20-Arg329, with a C-terminal 6-His tag
Accession #
N-terminal Sequence
Glu20 & Cys22
Predicted Molecular Mass
37 kDa
57-68 kDa, under reducing conditions.

Product Datasheets

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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 with Trehalose.
Reconstitution Reconstitute at 500 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.

Scientific Data

Bioactivity View Larger

Recombinant Human IL‑18 R alpha /IL‑1 R5 His-tag Protein (Catalog # 11179-LR) inhibits the Recombinant Human IL‑18/IL‑1F4 (9124-IL) induced response on KG‑1 human acute myelogenous leukemia cells in the presence of Recombinant Human IL‑18 R beta /IL-1 R7 Fc Chimera (118-AP). The ED50 for this effect is 0.400-4.00 μg/mL.

SDS-PAGE View Larger

2 μg/lane of Recombinant Human IL‑18 R alpha /IL‑1 R5 His-tag Protein (Catalog # 11179-LR) was resolved with SDS-PAGE under reducing (R) and non-reducing (NR) conditions and visualized by Coomassie® Blue staining, showing bands at 57-68- 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: IL-18 R alpha/IL-1 R5

IL-18 Receptor alpha (IL-18 Ra), also known as IL-18 R1, IL-1 R5, and IL-1 Rrp, is a transmembrane component of the IL-18 Receptor (1). It associates with IL‑18 Rb/IL‑1 R7 to form the high affinity receptor complex for IL-18 and confer cellular responsiveness to IL-18 (2, 3). IL-18 is a member of the IL-1 family of cytokines and shares numerous immunoregulatory functions with IL-12. Mature human IL-18 Ra consists of a 308 amino acid (aa) extracellular domain (ECD) with three immunoglobulin-like domains, a 21 aa transmembrane segment, and a 191 aa cytoplasmic domain (4). Within the ECD, human IL-18 Ra shares 56% aa sequence identity with mouse and rat IL-18 Ra. IL-18 Ra is widely expressed on epithelial cells as well as on B cells, NK cells, CD4+ and CD8+ T cells, and dendritic cells (5-8). Signaling through the IL-18 receptor promotes a Th1 biased immune response and NK cell cytolytic activity (6, 7, 9-11). It also contributes to cigarette smoke-induced airway inflammation and epithelial damage (12). 

  1. Dinarello, C.A. et al. (2013) Front. Immunol. 4:289.
  2. Torigoe, K. et al. (1997) J. Biol. Chem. 272:25737.
  3. Born, T.L. et al. (1998) J. Biol. Chem. 273:29445.
  4. Parnet, P. et al. (1996) J. Biol. Chem. 271:3967.
  5. Kunikata, T. et al. (1998) Cell Immunol. 189:135.
  6. Smeltz, R.B. et al. (2001) J. Exp. Med. 194:143.
  7. Chan, W.L. et al. (2001) J. Immunol. 167:1238.
  8. Kaser, A. et al. (2004) Blood 103:648.
  9. Tomura, M. et al. (1998) J. Immunol. 160:3759.
  10. Yoshimoto, T. et al. (1998) J. Immunol. 161:3400.
  11. Hyodo, Y. et al. (1999) J. Immunol. 162:1662.
  12. Kang, M.J. et al. (2007) J. Immunol. 178:1948.
Long Name
Interleukin 18 Receptor alpha
Entrez Gene IDs
8809 (Human); 16182 (Mouse)
Alternate Names
CD218a; CD218a;CDw218a;IL18R1;IL18RA;IL-18Ralpha;IL-18R-alpha;IL18Ralpha2;IL1RRP;IL-1Rrp;Interleukin-18 receptor 1; IL-1 R5; IL-1 Rrp; IL-18 R alpha; IL-18 R1; IL18R alpha; IL18R1; IL-18Ra


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