Predicted to enable 2-octaprenyl-6-methoxy-1,4-benzoquinone methylase activity. Predicted to be involved in methylation and ubiquinone biosynthetic process. Located in mitochondrion. Human ortholog(s) of this gene implicated in primary coenzyme Q10 deficiency 9. Orthologous to human COQ5 (coenzyme Q5, methyltransferase). [provided by Alliance of Genome Resources, Apr 2022]