Flavoprotein monooxygenase required for N-hydroxylation of the two acylated lysine residues during mycobactin assembly, thus producing the hydroxamate groups necessary for iron sequestration. Is also able, but less efficiently, to hydroxylate L-lysine (non acylated) in vitro (By similarity). L-lysine + NADPH + O2 = H2O + N(6)-hydroxy-L-lysine + NADP(+) Siderophore biosynthesis; mycobactin biosynthesis. Belongs to the lysine N(6)-hydroxylase/L-ornithine N(5)-oxygenase family.