IUBMB Enzyme Nomenclature


Accepted name: L-evernosamine nitrososynthase

Reaction: dTDP-β-L-evernosamine + 2 NADPH + 2 H+ + 2 O2 = dTDP-2,3,6-trideoxy-3-C-methyl-4-O-methyl-3-nitroso-β-L-arabino-hexopyranose + 2 NADP+ + 3 H2O (overall reaction)
(1a) dTDP-β-L-evernosamine + NADPH + H+ + O2 = dTDP-N-hydroxy-β-L-evernosamine + NADP+ + H2O
(1b) dTDP-N-hydroxy-β-L-evernosamine + NADPH + H+ + O2 = dTDP-2,3,6-trideoxy-3-C-methyl-4-O-methyl-3-nitroso-β-L-arabino-hexopyranose + NADP+ + 2 H2O

Glossary: dTDP-β-L-evernosamine = dTDP-3-amino-2,3,6-trideoxy-3-C-methyl-4-O-methyl-β-L-arabino-hexopyranose
dTDP-β-L-evernitrose = dTDP-2,3,6-trideoxy-3-C-methyl-4-O-methyl-3-nitro-β-L-arabino-hexopyranose

Systematic name: dTDP-β-L-evernosamine,NADPH:oxygen oxidoreductase (N-hydroxylating)

Comments: Requires FAD. Isolated from the bacterium Micromonospora carbonacea var. africana. The nitroso group is probably spontaneously oxidized to a nitro group giving dTDP-β-L-evernitrose, which is involved in the biosynthesis of the antibiotic everninomycin. The reaction was studied using dTDP-β-L-4-epi-vancosamine (dTDP-4-O-desmethyl-β-L-evernitrosamine).

Links to other databases: BRENDA, EXPASY, KEGG, MetaCyc, PDB, CAS registry number:


1. Hu, Y., Al-Mestarihi, A., Grimes, C.L., Kahne, D. and Bachmann, B.O. A unifying nitrososynthase involved in nitrosugar biosynthesis. J. Am. Chem. Soc. 130 (2008) 15756-15757. [PMID: 18983146]

2. Vey, J.L., Al-Mestarihi, A., Hu, Y., Funk, M.A., Bachmann, B.O. and Iverson, T.M. Structure and mechanism of ORF36, an amino sugar oxidizing enzyme in everninomicin biosynthesis. Biochemistry 49 (2010) 9306-9317. [PMID: 20866105]

[EC created 2014]

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