title: Synthesis of trans unsaturated fatty acids in Pseudomonas putida P8 by direct isomerization of the double bond of lipids.
abstract: The phospholipids of Pseudomonas putida P8 contain monounsaturated fatty acids in the cis and trans configuration. Cells of this phenol-degrading bacterium change the proportions of these isomers in response to the addition or elimination of a membrane active compound such as 4-chlorophenol. This study undoubtedly reveals that the cis unsaturated fatty acids are directly converted into trans isomers without involvement of de novo synthesis of fatty acids. Oleic acid, which cannot be synthesized by this bacterium, was incorporated as a cis unsaturated fatty acid marker in the membrane lipids of growing cells. The conversion of this fatty acid into the corresponding trans isomer was demonstrated by gas chromatographic-mass spectrometric analysis and use of 14C-labeled oleic acid. Separation and isolation of the cellular membranes showed that the fatty acid isomerase is located in the cytoplasmic membrane of P. putida P8.
authors.affiliation: Institut für Mikrobiologie, Universität Münster, Germany.
authors.forename: R
authors.initials: R
authors.lastname: Diefenbach
authors.forename: H
authors.initials: H
authors.lastname: Keweloh
mesh_terms: D002240:Carbohydrate Sequence; D005231:Fatty Acids, Unsaturated / Q000096:biosynthesis*; D007536:Isomerism; D050356:Lipid Metabolism; D008969:Molecular Sequence Data; D015394:Molecular Structure; D016958:Pseudomonas putida / Q000378:metabolism*
chemical_list: D005231:Fatty Acids, Unsaturated