Characterization of PECI, a novel monofunctional Delta(3), Delta(2)-enoyl-CoA isomerase of mammalian peroxisomes.
We report here the identification and characterization of human and mouse PECI, a novel gene that encodes a monofunctional peroxisomal Delta(3),Delta(2)-enoyl-CoA isomerase. Human and mouse PECI were identified on the basis of their sequence similarity to Eci1p, a recently characterized peroxisomal Delta(3),Delta(2)-enoyl-CoA isomerase from the yeast Saccharomyces cerevisiae. Cloning and sequencing of the human PECI cDNA revealed the presence of a 1077-base pair open reading frame predicted to encode a 359-amino acid protein with a mass of 39.6 kDa. The corresponding mouse cDNA contains a 1074-base pair open reading frame that encodes a 358-amino acid-long protein with a deduced mass of 39.4 kDa. Northern blot analysis demonstrated human PECI mRNA is expressed in all tissues. A bacterially expressed form of human PECI catalyzed the isomerization of 3-cis-octenoyl-CoA to 2-trans-octenoyl-CoA with a specific activity of 27 units/mg of protein. The human and mouse PECI proteins contain type-1 peroxisomal targeting signals, and human PECI was localized to peroxisomes by both subcellular fractionation and immunofluorescence microscopy techniques. The potential roles for this monofunctional Delta(3),Delta(2)-enoyl-CoA isomerase in peroxisomal metabolism are discussed.
Department of Biological Chemistry, The Johns Hopkins University School of Medicine, Baltimore, Maryland 21205, USA.
B V
BV
Geisbrecht
D
D
Zhang
H
H
Schulz
S J
SJ
Gould
D000595:Amino Acid Sequence; D000818:Animals; D019748:Carbon-Carbon Double Bond Isomerases / Q000737:chemistry* / Q000235:genetics* / Q000378:metabolism; D006528:Carcinoma, Hepatocellular; D002478:Cells, Cultured; D003001:Cloning, Molecular; D064006:Dodecenoyl-CoA Isomerase; D004926:Escherichia coli; D005347:Fibroblasts / Q000201:enzymology; D005796:Genes; D006801:Humans; D007700:Kinetics; D008113:Liver Neoplasms; D008322:Mammals; D051379:Mice; D008830:Microbodies / Q000201:enzymology*; D008969:Molecular Sequence Data; D016366:Open Reading Frames; D016133:Polymerase Chain Reaction; D014176:Protein Biosynthesis; D011994:Recombinant Proteins / Q000737:chemistry / Q000302:isolation & purification / Q000378:metabolism; D012441:Saccharomyces cerevisiae / Q000201:enzymology; D016415:Sequence Alignment; D017386:Sequence Homology, Amino Acid; D012867:Skin / Q000201:enzymology; D014407:Tumor Cells, Cultured
D011994:Recombinant Proteins; D019748:Carbon-Carbon Double Bond Isomerases; D064006:Dodecenoyl-CoA Isomerase; C576298:ECI1 protein, human; C119738:ECI2 protein, human; C576299:Eci1 protein, mouse; C576300:Eci2 protein, mouse