Enables gap junction channel activity involved in AV node cell-bundle of His cell electrical coupling and ion channel activity. Involved in AV node cell to bundle of His cell communication by electrical coupling and gap junction assembly. Acts upstream of or within several processes, including chemical synaptic transmission; circulatory system development; and visual perception. Located in gap junction. Part of connexin complex. Is expressed in several structures, including alimentary system; central nervous system; genitourinary system; heart; and integumental system. Orthologous to human GJC1 (gap junction protein gamma 1). [provided by Alliance of Genome Resources, Apr 2022]