IUBMB Enzyme Nomenclature


Accepted name: cyclic dehypoxanthinyl futalosine synthase

Reaction: dehypoxanthine futalosine + S-adenosyl-L-methionine = cyclic dehypoxanthinyl futalosine + 5'-deoxyadenosine + L-methionine

For diagram of reaction click here.

Glossary: dehypoxanthine futalosine = 3-{3-[(2R,3S,4R)-3,4,5-trihydroxytetrahydrofuran-2-yl]propanoyl}benzoate
cyclic dehypoxanthinyl futalosine = (2R,3S,4R)-3,4,5-trihydroxy-4'-oxo-3',4,4',5-tetrahydro-2'H,3H-spiro[furan-2,1'-naphthalene]-6'-carboxylate

Other name(s): MqnC; dehypoxanthinyl futalosine cyclase

Systematic name: dehypoxanthine futalosine:S-adenosyl-L-methionine oxidoreductase (cyclizing)

Comments: This enzyme is a member of the ‘AdoMet radical’ (radical SAM) family. The enzyme, found in several bacterial species, is part of the futalosine pathway for menaquinone biosynthesis.

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


1. Hiratsuka, T., Furihata, K., Ishikawa, J., Yamashita, H., Itoh, N., Seto, H. and Dairi, T. An alternative menaquinone biosynthetic pathway operating in microorganisms. Science 321 (2008) 1670-1673. [PMID: 18801996]

2. Cooper, L.E., Fedoseyenko, D., Abdelwahed, S.H., Kim, S.H., Dairi, T. and Begley, T.P. In vitro reconstitution of the radical S-adenosylmethionine enzyme MqnC involved in the biosynthesis of futalosine-derived menaquinone. Biochemistry 52 (2013) 4592-4594. [PMID: 23763543]

[EC created 2014 as EC, transferred 2014 to EC]

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