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  • 1
    Online Resource
    Online Resource
    Interactive Control of Rhodobacter capsulatus Redox-Balancing Systems during Phototrophic Metabolism
    American Society for Microbiology ; 2001
    In:  Journal of Bacteriology Vol. 183, No. 21 ( 2001-11), p. 6344-6354
    Details
    In: Journal of Bacteriology, American Society for Microbiology, Vol. 183, No. 21 ( 2001-11), p. 6344-6354
    Abstract: In nonsulfur purple bacteria, redox homeostasis is achieved by the coordinate control of various oxidation-reduction balancing mechanisms during phototrophic anaerobic respiration. In this study, the ability of Rhodobacter capsulatus to maintain a balanced intracellular oxidation-reduction potential was considered; in addition, interrelationships between the control of known redox-balancing systems, the Calvin-Benson-Bassham, dinitrogenase and dimethyl sulfoxide reductase systems, were probed in strains grown under both photoheterotrophic and photoautotrophic growth conditions. By using cbb I ( cbb form I operon)-, cbb II -, nifH -, and dorC -reporter gene fusions, it was demonstrated that each redox-balancing system responds to specific metabolic circumstances under phototrophic growth conditions. In specific mutant strains of R. capsulatus , expression of both the Calvin-Benson-Bassham and dinitrogenase systems was influenced by dimethyl sulfoxide respiration. Under photoheterotrophic growth conditions, coordinate control of redox-balancing systems was further manifested in ribulose 1,5-bisphosphate carboxylase/oxygenase and phosphoribulokinase deletion strains. These findings demonstrated the existence of interactive control mechanisms that govern the diverse means by which R. capsulatus maintains redox poise during photoheterotrophic and photoautotrophic growth.
    Type of Medium: Online Resource
    ISSN: 0021-9193 , 1098-5530
    URL: Article
    DOI: 10.1128/JB.183.21.6344-6354.2001
    Language: English
    Publisher: American Society for Microbiology
    Publication Date: 2001
    detail.hit.zdb_id: 1481988-0
    SSG: 12
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  • 2
    Online Resource
    Online Resource
    Metabolic Signals That Lead to Control of CBB Gene Expression in Rhodobacter capsulatus
    American Society for Microbiology ; 2002
    In:  Journal of Bacteriology Vol. 184, No. 7 ( 2002-04), p. 1905-1915
    Details
    In: Journal of Bacteriology, American Society for Microbiology, Vol. 184, No. 7 ( 2002-04), p. 1905-1915
    Abstract: Various mutant strains were used to examine the regulation and metabolic control of the Calvin-Benson-Bassham (CBB) reductive pentose phosphate pathway in Rhodobacter capsulatus . Previously, a ribulose 1,5-bisphosphate carboxylase/oxygenase (RubisCO)-deficient strain (strain SBI/II) was found to show enhanced levels of cbb I and cbb II promoter activities during photoheterotrophic growth in the presence of dimethyl sulfoxide. With this strain as the starting point, additional mutations were made in genes encoding phosphoribulokinase and transketolase and in the gene encoding the LysR-type transcriptional activator, CbbR II . These strains revealed that a product generated by phosphoribulokinase was involved in control of CbbR-mediated cbb gene expression in SBI/II. Additionally, heterologous expression experiments indicated that Rhodobacter sphaeroides CbbR responded to the same metabolic signal in R. capsulatus SBI/II and mutant strain backgrounds.
    Type of Medium: Online Resource
    ISSN: 0021-9193 , 1098-5530
    URL: Article
    DOI: 10.1128/JB.184.7.1905-1915.2002
    Language: English
    Publisher: American Society for Microbiology
    Publication Date: 2002
    detail.hit.zdb_id: 1481988-0
    SSG: 12
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  • 3
    Online Resource
    Online Resource
    Maintenance and control of redox poise in Rhodobacter capsulatus strains deficient in the Calvin-Benson-Bassham pathway
    Springer Science and Business Media LLC ; 2000
    In:  Archives of Microbiology Vol. 174, No. 5 ( 2000-11-20), p. 322-333
    Details
    In: Archives of Microbiology, Springer Science and Business Media LLC, Vol. 174, No. 5 ( 2000-11-20), p. 322-333
    Type of Medium: Online Resource
    ISSN: 0302-8933 , 1432-072X
    URL: Article
    DOI: 10.1007/s002030000209
    RVK:
    WA 15000
    Language: Unknown
    Publisher: Springer Science and Business Media LLC
    Publication Date: 2000
    detail.hit.zdb_id: 1458451-7
    detail.hit.zdb_id: 477-7
    detail.hit.zdb_id: 124824-8
    SSG: 12
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  • 4
    Online Resource
    Online Resource
    Complex I and Its Involvement in Redox Homeostasis and Carbon and Nitrogen Metabolism in Rhodobacter capsulatus
    American Society for Microbiology ; 2001
    In:  Journal of Bacteriology Vol. 183, No. 24 ( 2001-12-15), p. 7285-7294
    Details
    In: Journal of Bacteriology, American Society for Microbiology, Vol. 183, No. 24 ( 2001-12-15), p. 7285-7294
    Abstract: A transposon mutant of Rhodobacter capsulatus , strain Mal7, that was incapable of photoautotrophic and chemoautotrophic growth and could not grow photoheterotrophically in the absence of an exogenous electron acceptor was isolated. The phenotype of strain Mal7 suggested that the mutation was in some gene(s) not previously shown to be involved in CO 2 fixation control. The site of transposition in strain Mal7 was identified and shown to be in the gene nuoF , which encodes one of the 14 subunits for NADH ubiquinone-oxidoreductase, or complex I. To confirm the role of complex I and nuoF for CO 2 -dependent growth, a site-directed nuoF mutant was constructed (strain SBC1) in wild-type strain SB1003. The complex I-deficient strains Mal7 and SBC1 exhibited identical phenotypes, and the pattern of CO 2 fixation control through the Calvin-Benson-Bassham pathway was the same for both strains. It addition, it was shown that electron transport through complex I led to differential control of the two major cbb operons of this organism. Complex I was further shown to be linked to the control of nitrogen metabolism during anaerobic photosynthetic growth of R. capsulatus .
    Type of Medium: Online Resource
    ISSN: 0021-9193 , 1098-5530
    URL: Article
    DOI: 10.1128/JB.183.24.7285-7294.2001
    Language: English
    Publisher: American Society for Microbiology
    Publication Date: 2001
    detail.hit.zdb_id: 1481988-0
    SSG: 12
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  • 5
    Online Resource
    Online Resource
    Isolation of Marine Polycyclic Aromatic Hydrocarbon (PAH)-Degrading Cycloclasticus Strains from the Gulf of Mexico and Comparison of Their PAH Degradation Ability with That of Puget Sound Cycloclasticus Strains
    American Society for Microbiology ; 1998
    In:  Applied and Environmental Microbiology Vol. 64, No. 12 ( 1998-12), p. 4703-4710
    Details
    In: Applied and Environmental Microbiology, American Society for Microbiology, Vol. 64, No. 12 ( 1998-12), p. 4703-4710
    Abstract: Phenanthrene- and naphthalene-degrading bacteria were isolated from four offshore and nearshore locations in the Gulf of Mexico by using a modified most-probable-number technique. The concentrations of these bacteria ranged from 10 2 to 10 6 cells per ml of wet surficial sediment in mildly contaminated and noncontaminated sediments. A total of 23 strains of polycyclic aromatic hydrocarbon (PAH)-degrading bacteria were obtained. Based on partial 16S ribosomal DNA sequences and phenotypic characteristics, these 23 strains are members of the genus Cycloclasticus . Three representatives were chosen for a complete phylogenetic analysis, which confirmed the close relationship of these isolates to type strain Cycloclasticus pugetii PS-1, which was isolated from Puget Sound. PAH substrate utilization tests which included high-molecular-weight PAHs revealed that these isolates had similar, broad substrate ranges which included naphthalene, substituted naphthalenes, phenanthrene, biphenyl, anthracene, acenaphthene, and fluorene. Degradation of pyrene and fluoranthene occurred only when the strains were incubated with phenanthrene. Two distinct partial PAH dioxygenase iron sulfur protein (ISP) gene sequences were PCR amplified from Puget Sound and Gulf of Mexico Cycloclasticus strains. Phylogenetic analyses of these sequences revealed that one ISP type is related to the bph type of ISP sequences, while the other ISP type is related to the nah type of ISP sequences. The predicted ISP amino acid sequences for the Gulf of Mexico and Puget Sound strains are identical, which supports the hypothesis that these geographically separated isolates are closely related phylogentically. Cycloclasticus species appear to be numerically important and widespread PAH-degrading bacteria in both Puget Sound and the Gulf of Mexico.
    Type of Medium: Online Resource
    ISSN: 0099-2240 , 1098-5336
    URL: Article
    DOI: 10.1128/AEM.64.12.4703-4710.1998
    RVK:
    WA 15000
    Language: English
    Publisher: American Society for Microbiology
    Publication Date: 1998
    detail.hit.zdb_id: 223011-2
    detail.hit.zdb_id: 1478346-0
    SSG: 12
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