Interleukin-15 receptor subunit alpha

High-affinity receptor for interleukin-15. Can signal both in cis and trans where IL15R from one subset of cells presents IL15 to neighboring IL2RG-expressing cells (By similarity). In neutrophils, binds and activates kinase SYK in response to IL15 stimulation. In neutrophils, required for IL15-induced phagocytosis in a SYK-dependent manner. Expression of different isoforms may alter or interfere with signal transduction.; [Isoform 5]: Does not bind IL15.; [Isoform 6]: Does not bind IL15. {ECO:0000269|}.; [Isoform 7]: Does not bind IL15. {ECO:0000269|}.; [Isoform 8]: Does not bind IL15. {ECO:0000269|}.