UbiB is the prokaryotic homolog of yeast Abc1p and human ADCK3 (aarF domain containing kinase 3). It is required for the biosynthesis of Coenzyme Q (ubiquinone or Q), which is an essential lipid component in respiratory electron and proton transport. It is required in the first monooxygenase step in Q biosynthesis. Mutant strains with disrupted ubiB genes lack Q and accumulate octaprenylphenol, a Q biosynthetic intermediate.
Jiyao W et al.(2023). "The conserved domain database in 2023.",