Is required for lysine-epsilon oxidase (LOD) activity in M.mediterranea. May be involved in the generation of the quinonic cofactor of LodA, leading to the active form of LodA containing a tyrosine-derived quinone cofactor. Binds 1 FAD per subunit. Forms part of an operon with lodA. Cells lacking this gene do not show any lysine-epsilon oxidase activity. The intracellular stability of LodB is dependent on the presence of LodA protein.