UbiX is a flavin prenyltransferase required for bacterial ubiquinone biosynthesis.
White MD, Payne KA, Fisher K, Marshall SA, Parker D, Rattray NJ, Trivedi DK, Goodacre R, Rigby SE, Scrutton NS, et al. Nature. 2015 Jun 25; 522(7557):502-6. Epub 2015 Jun 17.