title: A Functional Tricarboxylic Acid Cycle Operates during Growth of Bordetella pertussis on Amino Acid Mixtures as Sole Carbon Substrates.
abstract: It has been claimed that citrate synthase, aconitase and isocitrate dehydrogenase activities are non-functional in Bordetella pertussis and that this might explain why this bacterium's growth is sometimes associated with accumulation of polyhydroxybutyrate (PHB) and/or free fatty acids. However, the sequenced genome includes the entire citric acid pathway genes. Furthermore, these genes were expressed and the corresponding enzyme activities detected at high levels for the pathway when grown on a defined medium imitating the amino acid content of complex media often used for growth of this pathogenic microorganism. In addition, no significant PHB or fatty acids could be detected. Analysis of the carbon balance and stoichiometric flux analysis based on specific rates of amino acid consumption, and estimated biomass requirements coherent with the observed growth rate, clearly indicate that a fully functional tricarboxylic acid cycle operates in contrast to previous reports.
authors.affiliation: Université de Toulouse; INSA, UPSr, INP, LISBP, Toulouse, France.|INRA, UMR792 Ingénierie des Systèmes Biologiques et des Procédés, Toulouse, France.|CNRS, UMR5504, Toulouse, France.
authors.forename: Marie
authors.initials: M
authors.lastname: Izac
authors.affiliation: Sanofi Pasteur, Marcy-l'Étoile, France.
authors.forename: Dominique
authors.initials: D
authors.lastname: Garnier
authors.affiliation: Sanofi Pasteur, Marcy-l'Étoile, France.
authors.forename: Denis
authors.initials: D
authors.lastname: Speck
authors.affiliation: Université de Toulouse; INSA, UPSr, INP, LISBP, Toulouse, France.|INRA, UMR792 Ingénierie des Systèmes Biologiques et des Procédés, Toulouse, France.|CNRS, UMR5504, Toulouse, France.
authors.forename: Nic D
authors.initials: ND
authors.lastname: Lindley
mesh_terms: D000596:Amino Acids / Q000378:metabolism*; D001426:Bacterial Proteins / Q000235:genetics / Q000378:metabolism; D001886:Bordetella pertussis / Q000254:growth & development / Q000378:metabolism*; D050260:Carbohydrate Metabolism; D002950:Citrate (si)-Synthase / Q000235:genetics / Q000378:metabolism; D002952:Citric Acid Cycle; D003470:Culture Media; D016680:Genome, Bacterial; D007521:Isocitrate Dehydrogenase / Q000235:genetics / Q000378:metabolism; D007700:Kinetics; D059467:Transcriptome
chemical_list: D000596:Amino Acids; D001426:Bacterial Proteins; D003470:Culture Media; D007521:Isocitrate Dehydrogenase; D002950:Citrate (si)-Synthase