High-affinity receptor for interleukin-15 (PubMed:17947230). Can signal both in cis and trans where IL15R from one subset of cells presents IL15 to neighboring IL2RG-expressing cells (PubMed:17947230). In neutrophils, binds and activates kinase SYK in response to IL15 stimulation (By similarity). In neutrophils, required for IL15-induced phagocytosis in a SYK-dependent manner (By similarity). The interleukin-15 receptor IL15R is a heterotrimer of IL15RA, IL2RB and IL2RG. IL15RA also self-associates (By similarity). Interacts with SYK (By similarity). Widely expressed. N-glycosylated and O-glycosylated. A soluble form (sIL-15RA) arises from proteolytic shedding of the membrane-anchored receptor (By similarity). It also binds IL15 and thus interferes with IL15 binding to the membrane receptor (By similarity). It was shown that proteolytic cleavage of Il15ra involves ADAM17/TACE; this publication has later been retracted.