Enables interleukin-27 receptor binding activity. Involved in T cell proliferation. Predicted to be located in extracellular space and membrane. Predicted to be part of receptor complex. Predicted to be active in external side of plasma membrane. Is expressed in several structures, including decidua; extraembryonic component; sensory organ; and skeleton. Orthologous to human EBI3 (Epstein-Barr virus induced 3). [provided by Alliance of Genome Resources, Apr 2022]