Acts upstream of or within several processes, including axonal transport of mitochondrion; mitochondrion organization; and positive regulation of transcription by RNA polymerase II. Located in cytosol; mitochondrion; and nucleus. Is integral component of mitochondrial outer membrane. Is expressed in central nervous system; jaw bone; testis mesenchyme; and tongue. Orthologous to human ARMCX3 (armadillo repeat containing X-linked 3). [provided by Alliance of Genome Resources, Apr 2022]