protein_function: Non-signaling receptor for IL1A, IL1B and IL1RN. ReducesIL1B activities. Serves as a decoy receptor by competetive bindingto IL1B and preventing its binding to IL1R1. Also modulatescellular response through non-signaling association with IL1RAPafter binding to IL1B. IL1R2 (membrane and secreted forms)preferentially binds IL1B and poorly IL1A and IL1RN. The secretedIL1R2 recruits secreted IL1RAP with high affinity; this complexformation may be the dominant mechanism for neutralization of IL1Bby secreted,soluble receptors..
Interleukin 1 receptor, type II(IL1R2) also known as CD121b(Cluster of Differentiation 121b) is an interleukin receptor. The protein encoded by this gene is a cytokine receptor that belongs to the interleukin-1 receptor family. It is mapped to 2q11.2. IL1R2 binds interleukin alpha(IL1A), interleukin beta(IL1B), and interleukin 1 receptor, type I(IL1R1,IL1RA), and acts as a decoy receptor that inhibits the activity of its ligands. IL1R2 also modulates cellular response through non-signaling association with IL1RAP after binding to IL1B. The secreted IL1R2 recruits secreted IL1RAP with high affinity, and this complex formation may be the dominant mechanism for neutralization of IL1B by secreted,soluble receptors.