Enables signaling receptor activity. Involved in several processes, including TRAF-mediated signal transduction; host-mediated regulation of intestinal microbiota composition; and regulation of inflammatory response. Acts upstream of or within positive regulation of NIK/NF-kappaB signaling and toll-like receptor signaling pathway. Located in plasma membrane. Orthologous to human LRRC19 (leucine rich repeat containing 19). [provided by Alliance of Genome Resources, Apr 2022]