Enables interleukin-5 receptor binding activity. Involved in positive regulation of cell growth; positive regulation of cell migration; and positive regulation of cell population proliferation. Acts upstream of or within Ras protein signal transduction. Part of interleukin-5 receptor complex. Is expressed in several structures, including central nervous system; heart; nose; skin; and urinary system. Orthologous to human SDCBP (syndecan binding protein). [provided by Alliance of Genome Resources, Apr 2022]