Enables copper ion binding activity and cytokine activity. Involved in several processes, including positive regulation of interleukin-2 production; positive regulation of mitotic nuclear division; and response to copper ion. Located in cytosol and extracellular space. Implicated in several diseases, including Fabry disease; Schnitzler syndrome; autoimmune disease (multiple); hematologic cancer (multiple); and lung disease (multiple). Biomarker of several diseases, including autoimmune disease (multiple); cholesteatoma (multiple); common cold; cystic fibrosis; and osteoarthritis.