Catalyzes the radical S-adenosyl-L-methionine (SAM)-dependent two-electron oxidation of 2-deoxy-scyllo-inosamine (DOIA) to amino-dideoxy-scyllo-inosose (amino-DOI) in the biosynthetic pathway of butirosin. 2-deoxy-scyllo-inosamine + S-adenosyl-L-methionine = 3-amino-2,3-dideoxy-scyllo-inosose + 5'-deoxyadenosine + H(+) + L-methionine Binds 2 [4Fe-4S] clusters. One cluster is coordinated with 3 cysteines and an exchangeable S-adenosyl-L-methionine. A second auxiliary cluster is also in contact with the substrate and is proposed to facilitate the loss of the second electron in the oxidation. Kinetic parameter was determined with saturating SAM. DOIA displays substrate inhibition. Antibiotic biosynthesis; butirosin biosynthesis. Belongs to the radical SAM superfamily.