The Enzyme Database

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Accepted name: demethoxycurcumin synthase
Reaction: (1) 4-coumaroyl-CoA + feruloylacetyl-CoA + H2O = 2 CoA + demethoxycurcumin + CO2
(2) 4-coumaroyl-CoA + (4-coumaroyl)acetyl-CoA + H2O = 2 CoA + bisdemethoxycurcumin + CO2
For diagram of curcumin biosynthesis, click here
Glossary: demethoxycurcumin = (1E,6E)-5-hydroxy-1-(4-hydroxy-3-methoxyphenyl)-7-(4-hydroxyphenyl)hepta-1,4,6-trien-3-one
bisdemethoxycurcumin = (1E,6E)-5-hydroxy-1,7-bis(4-hydroxyphenyl)hepta-1,4,6-trien-3-one
feruloylacetyl-CoA = feruloyl-diketide-CoA
(4-coumaroyl)acetyl-CoA = 4-coumaroyl-diketide-CoA
Other name(s): CURS3
Systematic name: 4-coumaroyl-CoA:feruloylacetyl-CoA feruloyltransferase (demethoxycurcumin-forming)
Comments: A polyketide synthase from the plant Curcuma longa (turmeric). Three isoforms exist, CURS1, CURS2 and CURS3. While CURS1 and CURS2 prefer feruloyl-CoA as a starter substrate (cf. EC, curcumin synthase), CURS3 can accept 4-coumaroyl-CoA equally well [1].
Links to other databases: BRENDA, EXPASY, KEGG, MetaCyc
1.  Katsuyama, Y., Kita, T. and Horinouchi, S. Identification and characterization of multiple curcumin synthases from the herb Curcuma longa. FEBS Lett. 583 (2009) 2799–2803. [DOI] [PMID: 19622354]
[EC created 2013]

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