Predicted to enable 2-polyprenyl-6-methoxy-1,4-benzoquinone methyltransferase activity. Predicted to be involved in ubiquinone biosynthetic process. Predicted to act upstream of or within methylation. Predicted to be located in mitochondrial inner membrane. Predicted to be extrinsic component of mitochondrial inner membrane. Human ortholog(s) of this gene implicated in primary coenzyme Q10 deficiency 9. Orthologous to human COQ5 (coenzyme Q5, methyltransferase).