• Purity

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

• Endotoxin Level

  <0.01 EU per 1 μg of the protein by the LAL method.  

• Activity

  Bioassay data are not available.

• Source

  Mouse myeloma cell line, NS0-derived

  Mouse SIGIRR (Met1 - His117) Accession # Q9JLZ8	IEGRMD	Human IgG1 (Pro100 - Lys330)
  N-terminus		C-terminus

• Accession #

• N-terminal Sequence    
  Analysis

  Met1    
   

• Structure / Form

  Disulfide-linked homodimer

• Predicted Molecular Mass

  39 kDa (monomer)

• SDS-PAGE

  63 kDa, reducing conditions

Background: SIGIRR

The Interleukin 1 receptor family (IL-1 R) comprises at least eleven members including IL-1 RI (IL-1 R1), IL-1 RII (IL-1 R2), IL-1 RAcP (IL‑1 R3), ST2 (T1/IL-1 R4), IL-18 Ra (IL-1 Rrp/IL-1 R5), IL-1 Rrp2 (IL-1 RL2/IL-1 R6), IL-18 Rb (AcPL/IL-1 R7), IL-1RAPL‑1 (TIGIRR‑2/IL‑1 R8), and TIGIRR-1 (IL-1 R9) (1). All family members possess three immunoglobulin (Ig)-like domains in their extracellular region. Most members have an intracellular TIR (Toll-like receptor/IL-1 receptor signaling) domain that is also conserved in the Toll-like receptor family. Five of the IL-1 R family members (1, 2, 4, 5, and 6) are clustered and localized to chromosome 2. SIGIRR (single Ig domain containing IL-1 receptor-related molecule) is a subtype of the IL-1 R family that differs from the other nine members by having only one Ig domain in its extracellular region. The sequence of mouse SIGIRR predicts a 409 amino acid (aa) residue transmembrane glycoprotein that lacks signal peptide and contains a 117 aa single Ig extracellular domain, a transmembrane region and a 268 aa cytoplasmic tail with a TIR domain. The cytoplasmic tail of SIGIRR contains a C-terminal extention beyond the TIR domain which is also found in IL-1 R8, IL-1 R9, and Toll-like receptor family members but absent in other IL-1 receptor family members. SIGIRR is widely expressed and is present in all cells and tissues examined. Mouse and human SIGIRR share 82% amino acid sequence identity. The ligand and signaling mechanism for SIGIRR has not been identified.

• References:

1. Thomassen, E. et al. (1999) Cytokine 11:389.

• Long Name:

  Single lg IL-1 Related Protein

• Entrez Gene IDs:

  59307 (Human); 24058 (Mouse)

• Alternate Names:

  SIGIRR; single Ig IL-1-related receptor; Single Ig IL-1R-related molecule; single immunoglobulin and toll-interleukin 1 receptor (TIR) domain; single immunoglobulin domain IL1R1 related; Single immunoglobulin domain-containing IL1R-related protein; TIR8; TIR8MGC110992; Toll/interleukin-1 receptor 8