title: The acyl-AMP ligase FadD32 and AccD4-containing acyl-CoA carboxylase are required for the synthesis of mycolic acids and essential for mycobacterial growth: identification of the carboxylation product and determination of the acyl-CoA carboxylase components.
abstract: Mycolic acids are major and specific long-chain fatty acids of the cell envelope of several important human pathogens such as Mycobacterium tuberculosis, M. leprae, and Corynebacterium diphtheriae. Their biosynthesis is essential for mycobacterial growth and represents an attractive target for developing new antituberculous drugs. We have previously shown that the pks13 gene encodes condensase, the enzyme that performs the final condensation step of mycolic acid biosynthesis and is flanked by two genes, fadD32 and accD4. To determine the functions of the gene products we generated two mutants of C. glutamicum with an insertion/deletion within either fadD32 or accD4. The two mutant strains were deficient in mycolic acid production and exhibited the colony morphology that typifies the mycolate-less mutants of corynebacteria. Application of multiple analytical approaches to the analysis of the mutants demonstrated the accumulation of a tetradecylmalonic acid in the DeltafadD32::km mutant and its absence from the DeltaaccD4::km strain. The parental corynebacterial phenotype was restored upon the transfer of the wild-type fadD32 and accD4 genes in the mutants. These data demonstrated that both FadD32 and AccD4-containing acyl-CoA carboxylase are required for the production of mycolic acids. They also prove that the proteins catalyze, respectively, the activation of one fatty acid substrate and the carboxylation of the other substrate, solving the long-debated question of the mechanism involved in the condensation reaction. We used comparative genomics and applied a combination of molecular biology and proteomic technologies to the analysis of proteins that co-immunoprecipitated with AccD4. This resulted in the identification of AccA3 and AccD5 as subunits of the acyl-CoA carboxylase. Finally, we used conditionally replicative plasmids to show that both the fadD32 and accD4 genes are essential for the survival of M. smegmatis. Thus, in addition to Pks13, FadD32 and AccD4 are promising targets for the development of new antimicrobial drugs against pathogenic species of mycobacteria and related microorganisms.
authors.affiliation: Département Mécanismes Moléculaires des Infections Mycobactériennes, Institut de Pharmacologie et Biologie Structurale, CNRS and Université Paul Sabatier (Unité Mixte de Recherche 5089), 205 route de Narbonne, 31077 Toulouse Cedex, France.
authors.forename: Damien
authors.initials: D
authors.lastname: Portevin
authors.forename: Célia
authors.initials: C
authors.lastname: de Sousa-D'Auria
authors.forename: Henri
authors.initials: H
authors.lastname: Montrozier
authors.forename: Christine
authors.initials: C
authors.lastname: Houssin
authors.forename: Alexandre
authors.initials: A
authors.lastname: Stella
authors.forename: Marie-Antoinette
authors.initials: MA
authors.lastname: Lanéelle
authors.forename: Fabienne
authors.initials: F
authors.lastname: Bardou
authors.forename: Christophe
authors.initials: C
authors.lastname: Guilhot
authors.forename: Mamadou
authors.initials: M
authors.lastname: Daffé
mesh_terms: D000595:Amino Acid Sequence; D001426:Bacterial Proteins / Q000737:chemistry / Q000378:metabolism*; D001483:Base Sequence; D019735:Carbon-Carbon Ligases / Q000737:chemistry / Q000378:metabolism*; D002455:Cell Division; D017124:Conserved Sequence; D003353:Corynebacterium diphtheriae / Q000254:growth & development; D017931:DNA Primers; D004269:DNA, Bacterial / Q000235:genetics; D005227:Fatty Acids / Q000096:biosynthesis / Q000737:chemistry; D008401:Gas Chromatography-Mass Spectrometry; D008969:Molecular Sequence Data; D009166:Mycobacterium leprae / Q000254:growth & development; D009169:Mycobacterium tuberculosis / Q000254:growth & development*; D009171:Mycolic Acids / Q000378:metabolism*; D016415:Sequence Alignment; D017386:Sequence Homology, Amino Acid
chemical_list: D001426:Bacterial Proteins; D017931:DNA Primers; D004269:DNA, Bacterial; D005227:Fatty Acids; D009171:Mycolic Acids; D019735:Carbon-Carbon Ligases