Human IL-1 RAcP/IL-1 R3 Alexa Fluor® 488-conjugated Antibody

  • Species Reactivity
  • Specificity
    Detects human IL-1RAcP/IL-1 R3 in direct ELISAs. In direct ELISAs, no cross-reactivity with recombinant human (rh) IL-1 RI, rhIL-1 RII, rhST2, rhIL-18 R alpha, IL-1 Rrp2, rhIL-18 RAP, rhSIGIRR, rhIL-1 RAPL1, rhIL-1 RAPL2, rhTLR1, rhTLR2, rhTLR3, rhTLR4, rhTLR5, rhTLR7, rhTLR8, rhTLR9, rhTLR10, rhMD-1, rhMD-2, or recombinant mouse RP105 is observed.
  • Source
    Monoclonal Mouse IgG1 Clone # 89412
  • Purification
    Protein A or G purified from hybridoma culture supernatant
  • Immunogen
    S. frugiperda insect ovarian cell line Sf21-derived recombinant human IL-1RAcP/IL-1 R3
    Ser21-Glu359 (predicted)
    Accession # Q9NPH3
  • Formulation
    Supplied in a saline solution containing BSA and Sodium Azide.
  • Label
    Alexa Fluor 488
  • Flow Cytometry
    5 µL/106 cells
    See below
Please Note: Optimal dilutions should be determined by each laboratory for each application. General Protocols are available in the Technical Information section on our website.
Data Examples
Detection of IL‑1 RAcP/IL‑1 R3 in Human Blood Monocytes by Flow Cytometry. Human peripheral blood monocytes were stained with Mouse Anti-Human IL‑1 RAcP/IL‑1 R3 Alexa Fluor® 488-conjugated Monoclonal Antibody (Catalog # FAB676G, filled histogram) or isotype control antibody (Catalog # IC002G, open histogram). View our protocol for Staining Membrane-associated Proteins.
Preparation and Storage
  • Shipping
    The product is shipped with polar packs. Upon receipt, store it immediately at the temperature recommended below.
  • Stability & Storage
    Protect from light. Do not freeze.
    • 12 months from date of receipt, 2 to 8 °C as supplied.
Background: IL-1 RAcP/IL-1 R3

IL-1 Receptor Accessory Protein (also IL-1 R3) is a ubiquitous 70-90 kDa member of the interleukin-1 receptor family of proteins (1-5). It serves as a non-ligand-binding accessory component of the receptors for IL-1 alpha, IL-1 beta, and IL-33 (6, 7). Together with IRAK4 and MyD88, it generates a functional signaling complex with IL-1 RI; by itself, it generates a non-signaling, but high-affinity binding complex with IL-1 RII (8). In addition, it interacts with ST2 on mast cells and Th2 T cells to create a functional IL-33 receptor complex (7). Mature human IL-1 RAcP is a type I transmembrane glycoprotein that is 550 amino acids in length. It contains a 347 amino acid (aa) extracellular region (aa 21-367), a 21 aa transmembrane segment, and a 182 aa cytoplasmic domain (9). The extracellular region shows three C2-type Ig-like domains, the most membrane proximal of which is suggested to be responsible for dimerization with IL-1 RI (10). There are three alternative splice forms reported for IL-1 RAcP. One is transmembrane and shows a 239 aa substitution for the C-terminal 122 amino acids (11). The other two are soluble; one shows a six aa substitution for aa 351-570, while a second shows a 45 aa substitution for aa 302-579 (12, 13). The soluble receptor isoforms appear to be inhibitory to IL-1 signaling. When present with soluble IL-1 RII, soluble IL-1 RAcP increases the IL-1 binding affinity of IL-1 RII more than 100-fold, thus neutralizing the effects of IL-1 (14). The human and mouse IL-1 RAcP precursors are 89% aa identical; within the extracellular region, they share 86% aa identity.

  • References:
    1. Subramaniam, S. et al. (2004) Dev. Comp. Immunol. 28:415.
    2. Boraschi, D. and A. Tagliabue (2006) Vitam. Horm. 74:229.
    3. Dunne, A. and L.A.J. O'Neill (2003) Sci STKE. Feb 25;2003(171):re3.
    4. Huang, J. et al. (1997) Proc. Natl. Acad. Sci. USA 94:12829.
    5. Greenfeder, S. A. et al. (1995) J. Biol. Chem. 270:13757.
    6. Brikos, C. et al. (2007) Mol. Cell. Proteomics 6:1551.
    7. Chackerian, A.A. et al. (2007) J. Immunol. 179:2551.
    8. Lang, D. et al. (1998) J. Immunol. 161:6871.
    9. SwissProt. Accession # Q9NPH3.
    10. Yoon, D-Y. and C.A. Dinarello (1998) J. Immunol. 160:3170.
    11. Lu, H-L. et al. (2008) Mol. Immunol. 45:1374.
    12. Jensen, L.E. et al. (2000) J. Immunol. 164:5277.
    13. Jensen, L.E. and A.S. Whitehead (2003) Cell. Signal. 15:793.
    14. Smith, D.E. et al. (2003) Immunity 18:87.
  • Long Name:
    Interleukin 1 Receptor Accessory Protein
  • Entrez Gene IDs:
    3556 (Human); 16180 (Mouse)
  • Alternate Names:
    C3orf13IL-1RAcPIL1R3Interleukin-1 receptor 3; FLJ37788; IL-1 R3; IL-1 receptor accessory protein; IL-1R3; IL-1R-3; IL1RAcP; IL-1RAcP; IL1RAP; interleukin 1 receptor accessory protein; interleukin-1 receptor accessory protein beta; interleukin-1 receptor accessory protein
Related Research Areas
Isotype Controls
Description Application Cat# Citations Images  

Mouse IgG1 Alexa Fluor® 488-conjugated Antibody

Ctrl IC002G 2  
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Staining Reagents
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Flow Cytometry Staining Buffer (1X)

Flow FC001 3
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Flow Cytometry Mouse Lyse Buffer (10X)

Flow FC003 1
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Flow Cytometry Human Lyse Buffer (10X)

Flow FC002 1
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