IUBMB Enzyme Nomenclature


Accepted name: demethyl-4-deoxygadusol synthase

Reaction: D-sedoheptulose 7-phosphate = demethyl-4-deoxygadusol + phosphate + H2O

For diagram of reaction click here.

Glossary: demethyl-4-deoxygadusol = 2,3,5-trihydroxy-5-(hydroxymethyl)cyclohex-2-en-1-one

Other name(s): Nos2 (gene name); Anb2 (gene name)

Systematic name: D-sedoheptulose-7-phosphate phosphate-lyase (cyclizing; demethyl-4-deoxygadusol-forming)

Comments: The enzyme, characterized from the cyanobacterium Nostoc punctiforme PCC 73102, is involved in the biosynthesis of the sunscreen compound shinorine. It requires a divalent metal ion (Zn2+ or Co2+) and an NAD+ cofactor, which is transiently reduced during the reaction. cf. EC, 2-epi-5-epi-valiolone synthase and EC, 2-epi-valiolone synthase.

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


1. Balskus, E.P. and Walsh, C.T. The genetic and molecular basis for sunscreen biosynthesis in cyanobacteria. Science 329 (2010) 1653-1656. [PMID: 20813918]

2. Asamizu, S., Xie, P., Brumsted, C.J., Flatt, P.M. and Mahmud, T. Evolutionary divergence of sedoheptulose 7-phosphate cyclases leads to several distinct cyclic products. J. Am. Chem. Soc. 134 (2012) 12219-12229. [PMID: 22741921]

[EC created 2016]

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