This is a family of Rossmann fold oxidoreductases that catalyze NADPH-dependent hydroxylation and are involved in siderophore biosynthesis. This family includes L-ornithine 5-monooxygenase, which catalyzes the hydroxylation of L-ornithine at the N5 position, and L-lysine 6-monooxygenase, which catalyzes the hydroxylation of lysine at the N6 position (EC:1.14.13.59).