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ENZYME entry: EC

Accepted Name
(R)-3-(aryl)lactoyl-CoA dehydratase
Alternative Name(s)
(R)-phenyllactoyl-CoA dehydratase
aryllactyl-CoA dehydratase
Reaction catalysed
  • (R)-3-phenyllactoyl-CoA <=> (E)-cinnamoyl-CoA + H2O
  • (R)-3-(4-hydroxyphenyl)lactoyl-CoA <=> (E)-4-coumaroyl-CoA + H2O
  • (R)-3-(indol-3-yl)lactoyl-CoA <=> (E)-3-(indol-3-yl)acryloyl-CoA + H2O
  • The enzyme, found in some amino acid-fermenting anaerobic bacteria, participates in the fermentation pathways of L-phenylalanine, L-tyrosine, and L-tryptophan.
  • It is a heterodimeric protein consisting of the FldB and FldC polypeptides, both of which contain an [4Fe-4S] cluster, and forms a complex with EC
  • In order to catalyze the reaction, the enzyme requires one high- energy electron that transiently reduces the electrophilic thiol ester carbonyl of the substrate to a nucleophilic ketyl radical anion, facilitating the elimination of the hydroxyl group.
  • This electron, which is provided by by EC, needs to be supplied only once, before the first reaction takes place, as it is regenerated at the end of each reaction cycle.
  • The enzyme acts on (R)-3-(aryl)lactoyl-CoAs produced by FldA, and regenerates the CoA donors used by that enzyme.
PRIAM enzyme-specific profiles4.2.1.175
KEGG Ligand Database for Enzyme Nomenclature4.2.1.175
IUBMB Enzyme Nomenclature4.2.1.175
MEDLINEFind literature relating to
Rhea expert-curated reactions4.2.1.175

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