title: Isolation of carotenoid-deficient mutant from alkylated dibenzothiophene desulfurizing nocardioform bacteria, Gordonia sp. TM414.
abstract: The dibenzothiophene-desulfurizing nocardioform bacteria, Gordonia sp. TM414, was isolated from oil-contaminated soil. To avoid coloration of the oil layer after the desulfurization reaction, which could decrease the quality of the oil, two colorless knock-out mutants, TPc and TPd, were isolated by using a broad-host-range transposon complex. Genomic sequence analysis revealed that the same gene was disrupted in these mutants and that the transposon-inserted gene was assigned as the gene for phytoene desaturase, crt I. The crt I mutants also showed desulfurization activity comparable to that of the parent strain in a model-oil/aqueous bi-phasic reaction, suggesting that the carotenoid production is not responsible for the bi-phasic desulfurization reaction that requires hydrophobic substrate incorporation from the organic phase.
authors.affiliation: Bio-Refining Process Laboratory, Japan Cooperation Center, Petroleum, 1900 Sodeshi-cho Shimizu-shi, Shizuoka 424-0037, Japan. to.matui@j-energy.co.jp
authors.forename: Toru
authors.initials: T
authors.lastname: Matsui
authors.forename: Kenji
authors.initials: K
authors.lastname: Maruhashi
mesh_terms: D000595:Amino Acid Sequence; D001673:Biodegradation, Environmental; D002338:Carotenoids / Q000096:biosynthesis* / Q000235:genetics*; D004251:DNA Transposable Elements; D004269:DNA, Bacterial / Q000737:chemistry / Q000302:isolation & purification; D004275:DNA, Ribosomal / Q000737:chemistry / Q000302:isolation & purification; D005798:Genes, Bacterial; D020459:Genes, rRNA / Q000235:genetics; D033601:Gordonia Bacterium / Q000145:classification / Q000235:genetics* / Q000302:isolation & purification / Q000378:metabolism*; D008969:Molecular Sequence Data; D016254:Mutagenesis, Insertional; D009154:Mutation; D010088:Oxidoreductases / Q000235:genetics / Q000378:metabolism; D010860:Pigments, Biological / Q000096:biosynthesis / Q000235:genetics; D012336:RNA, Ribosomal, 16S / Q000235:genetics; D017422:Sequence Analysis, DNA; D012988:Soil Microbiology; D012989:Soil Pollutants / Q000378:metabolism; D013876:Thiophenes / Q000378:metabolism*; D014169:Transformation, Bacterial; D014170:Transformation, Genetic
chemical_list: D004251:DNA Transposable Elements; D004269:DNA, Bacterial; D004275:DNA, Ribosomal; D010860:Pigments, Biological; D012336:RNA, Ribosomal, 16S; D012989:Soil Pollutants; D013876:Thiophenes; D002338:Carotenoids; D010088:Oxidoreductases; C022398:phytoene dehydrogenase; C016366:dibenzothiophene