title: Molecular characterization of Saccharomyces cerevisiae Delta3, Delta2-enoyl-CoA isomerase.
abstract: We report here the identification of the Saccharomyces cerevisiae peroxisomal Delta3,Delta2-enoyl-CoA isomerase, an enzyme that is essential for the beta-oxidation of unsaturated fatty acids. The yeast gene YLR284C was identified in an in silico screen for genes that contain an oleate response element, a transcription factor-binding site common to most fatty acid-induced genes. Growth on oleic acid resulted in a significant increase in YLR284C mRNA, demonstrating that it is indeed an oleate-induced gene. The deduced product of YLR284C contains a type 1 peroxisomal targeting signal-like sequence at its C terminus and localizes to the peroxisome in a PEX8-dependent manner. Removal of YLR284C from the S. cerevisiae genome eliminated growth on oleic acid, but had no effect on peroxisome biogenesis, indicating a role for YLR284C in fatty acid metabolism. Cells lacking YLR284C had no detectable Delta3,Delta2-enoyl-CoA isomerase activity, and a bacterially expressed form of this protein catalyzed the isomerization of 3-cis-octenoyl-CoA to 2-trans-octenoyl-CoA with a specific activity of 16 units/mg. We conclude that YLR284C encodes the yeast peroxisomal Delta3,Delta2-enoyl-CoA isomerase and propose a new name, ECI1, to reflect its enoyl-CoA isomerase activity.
authors.affiliation: Department of Biological Chemistry, The Johns Hopkins University School of Medicine, Baltimore, Maryland 21205, USA.
authors.forename: B V
authors.initials: BV
authors.lastname: Geisbrecht
authors.forename: D
authors.initials: D
authors.lastname: Zhu
authors.forename: K
authors.initials: K
authors.lastname: Schulz
authors.forename: K
authors.initials: K
authors.lastname: Nau
authors.forename: J C
authors.initials: JC
authors.lastname: Morrell
authors.forename: M
authors.initials: M
authors.lastname: Geraghty
authors.forename: H
authors.initials: H
authors.lastname: Schulz
authors.forename: R
authors.initials: R
authors.lastname: Erdmann
authors.forename: S J
authors.initials: SJ
authors.lastname: Gould
mesh_terms: D000595:Amino Acid Sequence; D001483:Base Sequence; D019748:Carbon-Carbon Double Bond Isomerases / Q000737:chemistry / Q000235:genetics* / Q000378:metabolism; D004271:DNA, Fungal; D064006:Dodecenoyl-CoA Isomerase; D015971:Gene Expression Regulation, Enzymologic / Q000187:drug effects; D015966:Gene Expression Regulation, Fungal / Q000187:drug effects; D008830:Microbodies / Q000201:enzymology; D008969:Molecular Sequence Data; D019301:Oleic Acid / Q000494:pharmacology; D011401:Promoter Regions, Genetic; D011994:Recombinant Proteins / Q000737:chemistry / Q000235:genetics / Q000378:metabolism; D012441:Saccharomyces cerevisiae / Q000201:enzymology*
chemical_list: D004271:DNA, Fungal; D011994:Recombinant Proteins; D019301:Oleic Acid; D019748:Carbon-Carbon Double Bond Isomerases; D064006:Dodecenoyl-CoA Isomerase