Involved in several processes, including positive regulation of fatty acid beta-oxidation; positive regulation of sequestering of calcium ion; and striated muscle cell differentiation. Located in mitochondrial inner membrane. Is integral component of mitochondrial inner membrane. Is expressed in Meckel's cartilage; axial skeleton; esophagus; and retina nuclear layer. Orthologous to human MTLN (mitoregulin). [provided by Alliance of Genome Resources, Apr 2022]