Accepted name: caffeoyl-CoA reductase
Reaction: 3-(3,4-dihydroxyphenyl)propanoyl-CoA + 2 NAD+ + 2 reduced ferredoxin [iron-sulfur] cluster = (2E)-3-(3,4-dihydroxyphenyl)prop-2-enoyl-CoA + 2 NADH + 2 oxidized ferredoxin [iron-sulfur] cluster
Glossary: (2E)-3-(3,4-dihydroxyphenyl)prop-2-enoyl-CoA = (2E)-3-(3,4-dihydroxyphenyl)acryloyl-CoA = trans-caffeoyl-CoA
3-(3,4-dihydroxyphenyl)propanoyl-CoA = hydrocaffeoyl-CoA
Other name(s): electron-bifurcating caffeoyl-CoA reductase; caffeoyl-CoA reductase-Etf complex; hydrocaffeoyl-CoA:NAD+,ferredoxin oxidoreductase
Systematic name: 3-(3,4-dihydroxyphenyl)propanoyl-CoA:NAD+,ferredoxin oxidoreductase
Comments: The enzyme, characterized from the bacterium Acetobacterium woodii, contains two [4Fe-4S] clusters and FAD. The enzyme couples the endergonic ferredoxin reduction with NADH as reductant to the exergonic reduction of caffeoyl-CoA with the same reductant. It uses the mechanism of electron bifurcation to overcome the steep energy barrier in ferredoxin reduction. It also reduces 4-coumaroyl-CoA and feruloyl-CoA.
1.  Bertsch, J., Parthasarathy, A., Buckel, W. and Muller, V. An electron-bifurcating caffeyl-CoA reductase. J. Biol. Chem. 288 (2013) 11304–11311. [PMID: 23479729]
[EC created 2015]
Accepted name: caffeate CoA-transferase
Reaction: 3-(3,4-dihydroxyphenyl)propanoyl-CoA + (2E)-3-(3,4-dihydroxyphenyl)prop-2-enoate = 3-(3,4-dihydroxyphenyl)propanoate + (2E)-3-(3,4-dihydroxyphenyl)prop-2-enoyl-CoA
Glossary: 3-(3,4-dihydroxyphenyl)propanoate = hydrocaffeate
(2E)-3-(3,4-dihydroxyphenyl)prop-2-enoate = (2E)-3-(3,4-dihydroxyphenyl)acrylate = trans-caffeate
Other name(s): CarA
Systematic name: 3-(3,4-dihydroxyphenyl)propanoyl-CoA:(2E)-3-(3,4-dihydroxyphenyl)prop-2-enoate CoA-transferase
Comments: The enzyme, isolated from the bacterium Acetobacterium woodii, catalyses an energy-saving CoA loop for caffeate activation. In addition to caffeate, the enzyme can utilize 4-coumarate or ferulate as CoA acceptor.
1.  Hess, V., Gonzalez, J.M., Parthasarathy, A., Buckel, W. and Muller, V. Caffeate respiration in the acetogenic bacterium Acetobacterium woodii: a coenzyme A loop saves energy for caffeate activation. Appl. Environ. Microbiol. 79 (2013) 1942–1947. [PMID: 23315745]
[EC created 2015]