Interleukin 15 receptor, alpha subunit

Interleukin 15 receptor, alpha subunit is a subunit of the interleukin 15 receptor that in humans is encoded by the IL15RA gene.[5]

IL15RA
Available structures
PDBOrtholog search: PDBe RCSB
Identifiers
AliasesIL15RA, CD215, Interleukin 15 receptor, alpha subunit, interleukin 15 receptor subunit alpha
External IDsOMIM: 601070 MGI: 104644 HomoloGene: 1650 GeneCards: IL15RA
Gene location (Human)
Chr.Chromosome 10 (human)[1]
Band10p15.1Start5,943,639 bp[1]
End5,978,187 bp[1]
RNA expression pattern
More reference expression data
Orthologs
SpeciesHumanMouse
Entrez

3601

16169

Ensembl

ENSG00000134470

ENSMUSG00000023206

UniProt

Q13261

Q60819

RefSeq (mRNA)
RefSeq (protein)
Location (UCSC)Chr 10: 5.94 – 5.98 MbChr 2: 11.71 – 11.73 Mb
PubMed search[3][4]
Wikidata
View/Edit HumanView/Edit Mouse

Structure

The IL-15 receptor is composed of three subunits: IL-15R alpha, CD122, and CD132. Two of these subunits, CD122 and CD132, are shared with the receptor for IL-2, but IL-2 receptor has an additional subunit (CD25). The shared subunits contain the cytoplasmic motifs required for signal transduction, and this forms the basis of many overlapping biological activities of IL15 and IL2, although in vivo the two cytokines have separate biological effects. This may be due to effects of the respective alpha chains, which are unique to each receptor, the kinetics and affinity of cytokine-cytokine receptor binding, or due to the availability and concentration of each cytokine.

Function

IL-15Ralpha specifically binds IL15 with very high affinity,[6] and is capable of binding IL-15 independently of other subunits. It is suggested that this property allows IL-15 to be produced by one cell, endocytosed by another cell, and then presented to a third party cell.[7]

This receptor is reported to enhance cell proliferation and expression of apoptosis inhibitor BCL2L1/BCL2-XL and BCL2. Multiple alternatively spliced transcript variants of this gene have been reported. The full length sequences of only two variants encoding distinct isoforms are available.[5]

Isoforms

Several isoforms of the IL-15Ralpha protein have been detected. These isoforms can either result from alternative splicing of the mRNA encoding for the receptor or by shedding of the extra cellular domain of the receptor protein.

References

  1. GRCh38: Ensembl release 89: ENSG00000134470 - Ensembl, May 2017
  2. GRCm38: Ensembl release 89: ENSMUSG00000023206 - Ensembl, May 2017
  3. "Human PubMed Reference:". National Center for Biotechnology Information, U.S. National Library of Medicine.
  4. "Mouse PubMed Reference:". National Center for Biotechnology Information, U.S. National Library of Medicine.
  5. EntrezGene 3601
  6. Giri JG, Ahdieh M, Eisenman J, Shanebeck K, Grabstein K, Kumaki S, Namen A, Park LS, Cosman D, Anderson D (1994). "Utilization of the beta and gamma chains of the IL-2 receptor by the novel cytokine IL-15". EMBO J. 13 (12): 2822–30. doi:10.1002/j.1460-2075.1994.tb06576.x. PMC 395163. PMID 8026467.
  7. Dubois S, Mariner J, Waldmann TA, Tagaya Y (2002). "IL-15Ralpha recycles and presents IL-15 In trans to neighboring cells". Immunity. 17 (5): 537–47. doi:10.1016/s1074-7613(02)00429-6. PMID 12433361. (primary source)

Further reading



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