Enables several functions, including protein C-terminus binding activity; signaling receptor binding activity; and syndecan binding activity. Involved in presynapse assembly. Predicted to be located in several cellular components, including extracellular exosome; membrane raft; and nucleus. Predicted to be part of interleukin-5 receptor complex. Predicted to be active in cytoplasm and plasma membrane. Orthologous to human SDCBP (syndecan binding protein). [provided by Alliance of Genome Resources, Apr 2022]