Enables ubiquitin-protein transferase activity. Involved in several processes, including regulation of muscle adaptation; response to interleukin-1; and skeletal muscle atrophy. Acts upstream of or within muscle contraction. Located in contractile fiber. Used to study muscular dystrophy. Biomarker of muscular atrophy and muscular dystrophy. Orthologous to human TRIM63 (tripartite motif containing 63). [provided by Alliance of Genome Resources, Apr 2022]