Enables GTP binding activity and protein kinase binding activity. Involved in negative regulation of cold-induced thermogenesis and positive regulation of TOR signaling. Acts upstream of or within positive regulation of oligodendrocyte differentiation. Part of spliceosomal complex. Is expressed in chondrocranium bone; nervous system; nucleus pulposus; and sensory organ. Orthologous to human RHEB (Ras homolog, mTORC1 binding). [provided by Alliance of Genome Resources, Apr 2022]