title: Mutagenesis, cloning and complementation analysis of C4-dicarboxylate transport genes from Rhodobacter capsulatus.
abstract: Transposon mutagenesis was used to isolate insertion mutants of the photosynthetic bacterium Rhodobacter capsulatus which were unable to grow under aerobic conditions in the dark on malate, succinate or fumarate as sole carbon sources. Of five mutants isolated, all were deficient in C4-dicarboxylate transport. However, these mutants were still capable of photoheterotrophic growth, although at a slower rate than the wild type, on malate and succinate (but not fumarate). The mutated locus (designated dct) was complemented in trans using a cosmid gene bank. Subcloning and complementation analysis indicated that at least three closely linked genes essential for aerobic dicarboxylate transport were contained within an 8.3 kb region of the Rhodobacter capsulatus chromosome.
authors.affiliation: Department of Molecular Biology and Biotechnology, University of Sheffield, Western Bank, UK.
authors.forename: M J
authors.initials: MJ
authors.lastname: Hamblin
authors.forename: J G
authors.initials: JG
authors.lastname: Shaw
authors.forename: J P
authors.initials: JP
authors.lastname: Curson
authors.forename: D J
authors.initials: DJ
authors.lastname: Kelly
mesh_terms: D001692:Biological Transport; D015139:Blotting, Southern; D003001:Cloning, Molecular; D003227:Conjugation, Genetic; D004251:DNA Transposable Elements; D003998:Dicarboxylic Acids / Q000378:metabolism*; D005798:Genes, Bacterial; D005816:Genetic Complementation Test; D008040:Genetic Linkage; D008293:Malates / Q000378:metabolism; D016254:Mutagenesis, Insertional; D015183:Restriction Mapping; D016354:Rhodobacter capsulatus / Q000201:enzymology / Q000235:genetics* / Q000378:metabolism
chemical_list: D004251:DNA Transposable Elements; D003998:Dicarboxylic Acids; D008293:Malates; C030298:malic acid