Interleukin-5 receptor
| interleukin 5 receptor, alpha | |
|---|---|
| Identifiers | |
| Symbol | IL5RA |
| Alt. symbols | IL5R |
| Entrez | 3568 |
| HUGO | 6017 |
| OMIM | 147851 |
| RefSeq | NM_175725 |
| UniProt | Q01344 |
| Other data | |
| Locus | Chr. 3 p26-p24 |
| colony stimulating factor 2 receptor, beta, low-affinity (granulocyte-macrophage) | |
|---|---|
| Identifiers | |
| Symbol | CSF2RB |
| Alt. symbols | IL3RB |
| Entrez | 1439 |
| HUGO | 2436 |
| OMIM | 138981 |
| RefSeq | NM_000395 |
| UniProt | P32927 |
| Other data | |
| Locus | Chr. 22 q12.2-13.1 |
The interleukin-5 receptor is a type I cytokine receptor. It is a heterodimer of the interleukin 5 receptor alpha subunit and CSF2RB.
The IL-5 receptor (IL-5R) belongs to the type I cytokine receptor family and is a heterodimer composed of two polypeptide chains, one α subunit, which binds IL-5 and confers upon the receptor cytokine specificity, and one β subunit, which contains the signal transduction domains.
The IL-5Rα chain is exclusively expressed by eosinophils, some basophils and murine B1 cells or B cell precursors. Like many other cytokine receptors, alternative splicing of the α-chain gene results in expression of either a membrane bound or soluble form of the bα-chain. The soluble form does not lead to signal transduction and therefore has an antagonistic effect on IL-5 signaling. Both monomeric forms of IL-5Rα are low affinity receptors, while dimerization with the β-chain produces a high affinity receptor. In either case, the α-chain exclusively binds IL-5 and the intra-cellular portion of IL-5Rα is associated with Janus kinase (JAK) 2, a protein tyrosine-kinase essential in IL-5 signal transduction.
The β-subunit of the IL-5 receptor is responsible for signal transduction and contains several intracellular signaling domains. Unlike the α-chain, the β-chain does not bind IL-5, is not specific to this cytokine, and is expressed on practically all leukocytes. In fact, the β-subunit of the IL-5 receptor is also found in IL-3 and GM-CSF receptors where it is associated with IL-3Rα and GM-CSFRα subunits respectively. Therefore, it is known as the common β receptor or βc. As with the IL-5Rα subunit, the β subunit’s cytoplasmic domain is constitutively associated with JAK2, as well as LYN, another tyrosine kinase, which are both essential for IL-5 signal transduction.
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