title: DNA repair mutants of Rhodobacter sphaeroides.
abstract: The genome of the photosynthetic eubacterium Rhodobacter sphaeroides 2.4.1 comprises two chromosomes and five endogenous plasmids and has a 65% G+C base composition. Because of these characteristics of genome architecture, as well as the physiological advantages that allow this organism to live in sunlight when in an anaerobic environment, the sensitivity of R. sphaeroides to UV radiation was compared with that of the more extensively studied bacterium Escherichia coli. R. sphaeroides was found to be more resistant, being killed at about 60% of the rate of E. coli. To begin to analyze the basis for this increased resistance, a derivative of R. sphaeroides, strain 2.4.1 delta S, which lacks the 42-kb plasmid, was mutagenized with a derivative of Tn5, and the transposon insertion mutants were screened for increased UV sensitivity (UVs). Eight UVs strains were isolated, and the insertion sites were determined by contour-clamped homogeneous electric field pulsed-field gel electrophoresis. These mapped to at least five different locations in chromosome I. Preliminary analysis suggested that these mutants were deficient in the repair of DNA damage. This was confirmed for three loci by DNA sequence analysis, which showed the insertions to be within genes homologous to uvrA, uvrB, and uvrC, the subunits of the nuclease responsible for excising UV damage.
authors.affiliation: Department of Biochemistry and Molecular Biology, University of Texas Medical School, Houston 77225, USA.
authors.forename: C
authors.initials: C
authors.lastname: Mackenzie
authors.forename: M
authors.initials: M
authors.lastname: Chidambaram
authors.forename: E J
authors.initials: EJ
authors.lastname: Sodergren
authors.forename: S
authors.initials: S
authors.lastname: Kaplan
authors.forename: G M
authors.initials: GM
authors.lastname: Weinstock
mesh_terms: D000595:Amino Acid Sequence; D001483:Base Sequence; D002874:Chromosome Mapping; D004260:DNA Repair; D004251:DNA Transposable Elements; D004269:DNA, Bacterial / Q000235:genetics; D004706:Endodeoxyribonucleases / Q000235:genetics*; D029968:Escherichia coli Proteins; D005798:Genes, Bacterial; D008969:Molecular Sequence Data; D012242:Rhodobacter sphaeroides / Q000235:genetics*; D016415:Sequence Alignment; D017386:Sequence Homology, Amino Acid
chemical_list: D004251:DNA Transposable Elements; D004269:DNA, Bacterial; D029968:Escherichia coli Proteins; D004706:Endodeoxyribonucleases; C036385:endodeoxyribonuclease uvrABC