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  • 1
    Electronic Resource
    Electronic Resource
    Effects of light intensity on membrane differentiation in Rhodopseudomonas capsulata
    Amsterdam : Elsevier
    Biochimica et Biophysica Acta (BBA)/Bioenergetics 547 (1979), S. 417-428 
    Details
    ISSN: 0005-2728
    Keywords: Bacteriochlorophyll ; Light effect (Rhodopseudomonas capsulata) ; Light-harvesting complex ; Membrane differentiation ; Photosynthetic apparatus ; Reaction center
    Source: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
    Topics: Biology , Chemistry and Pharmacology , Medicine , Physics
    Type of Medium: Electronic Resource
    URL: http://linkinghub.elsevier.com/retrieve/pii/0005-2728(79)90022-7
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  • 2
    Electronic Resource
    Electronic Resource
    Energetic aspects of photophosphorylation capacity and reaction center content of Rhodopseudomonas capsulata, grown in a turbidostat under different irradiances
    Amsterdam : Elsevier
    Biochimica et Biophysica Acta (BBA)/Bioenergetics 725 (1983), S. 455-463 
    Details
    ISSN: 0005-2728
    Keywords: (Rps. capsulata) ; Bacterial photosynthesis ; Membrane differentiation ; Phosphosphorylation ; Reaction center
    Source: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
    Topics: Biology , Chemistry and Pharmacology , Medicine , Physics
    Type of Medium: Electronic Resource
    URL: http://linkinghub.elsevier.com/retrieve/pii/0005-2728(83)90186-X
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  • 3
    Electronic Resource
    Electronic Resource
    On insertion of pigment-associated polypeptides during membrane biogenesis in Rhodopseudomonas capsulata (1981)
    Springer
    Archives of microbiology 128 (1981), S. 376-383 
    Details
    ISSN: 1432-072X
    Keywords: Bacteriochlorophyll a ; Associated polypeptides ; Rhodopseudomonas capsulata ; Membrane differentiation ; Photosynthetic apparatus
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract Early stages in the formation of membranes and photosynthetic units were studied under growth-limiting phototrophic and chemotrophic conditions in cells of Rhodopseudomonas capsulata. The incorporation of polypeptides, forming bacteriochlorophyll-carotinoid-protein complexes in the membrane, was followed by use of pulse-labeling and immunoprecipitation techniques. The newly synthesized polypeptides were inserted into two distinct membrane fractions at both different rates and proportions. The two membrane fractions differed in sedimentation behavior, absorption spectra and activities of the respiratory chain. The individual pigment-associated proteins did not exhibit precursor-product relationship between the two membrane fractions. The data suggest that newly synthesized polypeptides were integrated both into cytoplasmic and pre-existing intracytoplasmic membranes, where the proteins and pigments were assembled to form reaction centers and light-harvesting pigment-protein complexes.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00405916
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  • 4
    Electronic Resource
    Electronic Resource
    Fusion of proteoliposomes containing the B800-850 light-harvesting complex with membranes of the mutant strain NK3 of Rhodopseudomonas capsulata lacking B800-850 (1985)
    Springer
    Archives of microbiology 141 (1985), S. 239-243 
    Details
    ISSN: 1432-072X
    Keywords: Absorption spectra ; Fluorescence emission spectra ; Carotenoid band shift ; Excition transfer ; Light-harvesting complexes ; Rhodopseudomonas capsulata
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract Intracytoplasmic membranes of the mutant strain NK3 of Rhodopseudomonas capsulata lacking the lightharvesting complex B800-850 were fused with proteoliposomes containing the B800-850 complex. Fluorescence emission spectroscopy at 77K showed that after fusion the fluorescence of the B850 bacteriochlorophyll disappeared nearly completely and the B870 fluorescence became prominent. This result and control experiments with proteoliposome-chromatophore mixture and with chromatophore and solubilized B800-850 complexes, respectively, indicate that in fused membranes a reorientation of membrane particles took place and excitons migrated from B850 to B870 bacteriochlorophyll. In fused proteoliposome-chromatophore vesicles a light-induced carotenoid band shift was observed, reflecting the building of an electrical membrane potential due to chargeseparation. Carotenoid band shift was not observed in separated proteoliposomes and NK3 chromatophores. It is concluded that by membrane fusion and lateral diffusion of membrane particles reaction center-light-harvesting B870 complexes came in functional contact with B800-850 antenna complexes.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00408065
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  • 5
    Electronic Resource
    Electronic Resource
    Differentiation of the intracytoplasmic membrane of Rhodopseudomonas palustris induced by variations of oxygen partial pressure or light intensity (1977)
    Springer
    Archives of microbiology 115 (1977), S. 299-306 
    Details
    ISSN: 1432-072X
    Keywords: Rhodopseudomonas palustris ; Intracytoplasmic membrane ; Bacteriochlorophyll ; Antenna pigments ; Pigment-protein complexes ; Membrane differentiation ; Influence of light intensity
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract The photosynthetic apparatus of Rhodopseudomonas palustris contains, in addition to reaction center bacteriochlorophyll (Bchl) two spectral forms of light harvesting (LH) Bchl, i.e. LH Bchl I, characterized by an infrared absorption maximum at 880 nm (890 nm at 77°K) and LH Bchl II absorbing at 805 and 855 nm (805 and 870 nm at 77°K). LH Bchl I seems to be associated with a single protein species of an apparent mol. wt. of 13000 whereas LH Bchl II is apparently associated with two proteins of mol. wts. of 9000 and 11000. Cells in anaerobic cultures adapt to changes of light intensity 1. by variation of the size of the photosynthetic unit, i.e. the molar ratio of LH Bchl II to reaction center Bchl, 2. by variation of the number of photosynthetic units per unit of membrane area, 3. by regulation of the size of the intracytoplasmic membrane system. During adaptation of changes of oxygen partial pressure cells are able to synthesize reaction center Bchl, LH Bchl and intracytoplasmic membranes at different rates. The synthesis of reaction center Bchl and LH Bchl I are, however, coordinated with each other, while the syntheses of LH Bchl II and reaction center Bchl proceed independently.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00446456
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  • 6
    Electronic Resource
    Electronic Resource
    Characterization of three membrane fractions isolated from cells of Rhodopseudomonas capsulata adapting from chemotrophic to phototrophic conditions (1980)
    Springer
    Archives of microbiology 127 (1980), S. 157-161 
    Details
    ISSN: 1432-072X
    Keywords: Rhodopseudomonas capsulata ; Membrane differentiation ; Photophosphorylation ; Succinate dehydrogenase ; NADH dehydrogenase
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract By means of sucrose density centrifugation three membrane fractions, named “light, medium and heavy” have been isolated from cells of Rhodopseudomonas capsulata strain 37b4, adapting from chemotrophic to phototrophic growth conditions. Succinate dehydrogenase activity of aerobically grown cells was mainly confined to the heavy (chromatophore) fraction. Upon changing to phototrophic conditions the activity of the succinate dehydrogenase increased in the medium and light fraction. All fractions contain bacteriochlorophyll. NADH dehydrogenase of chemotrophically grown cells was enriched in the light and medium fraction but is increased in the heavy fraction under phototrophic growth conditions. The capacity of photophosphorylation is high in the light and heavy fraction. The results indicate a differentially incorporation of functional subunits into specific parts of the membrane system during membrane differentiation.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00428019
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  • 7
    Electronic Resource
    Electronic Resource
    Differentiation of the membrane system in cells of Rhodopseudomonas capsulata after transition from chemotrophic to phototrophic growth conditions (1982)
    Springer
    Archives of microbiology 131 (1982), S. 313-322 
    Details
    ISSN: 1432-072X
    Keywords: Membrane differentiation ; Buoyant density ; Photosynthetic units ; Bacteriochlorophyll, emission, absorption ; Phospholipids
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract Aerobically in the dark grown cultures of Rhodopseudomonas capsulata were shifted to low oxygen partial pressure for 30 min and afterwards to phototrophic conditions (anaerobic, light). During 210 min of adaptation to a phototrophic mode of life the bacteriochlorophyll (BChl) concentration increased 53-fold (doubling time 40 min) and the carotenoid content six fold. Growth was delayed. The light membrane fraction from chemotrophic and induced phototrophic cells contained low concentrations of small photosynthetic units (reaction center+light harvesting BChl B870), and low respiratory activities, especially of succinatecytochrome c oxidase. The heavy membrane fraction, i.e. the intracytoplasmic chromatophore fraction, increased during adaptation approximately 9-fold in surface area per cell, 42-fold in BChl content, 7-fold in reaction center content and 6-fold in the size of the photosynthetic unit. Phospholipid and fatty acid content and patterns changed slightly during adaptation.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00411178
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  • 8
    Electronic Resource
    Electronic Resource
    Growth and photosynthetic activities of wild-type and antenna-deficient mutant strains of Rhodobacter capsulatus (1991)
    Springer
    Archives of microbiology 155 (1991), S. 205-209 
    Details
    ISSN: 1432-072X
    Keywords: Turbidostat ; Light-intensity ; Growth ; Photophosphorylation ; Reaction center bleaching ; Absorption spectra ; Rhodobacter capsulatus mutants ; Antenna deficiency
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract Cells of Rhodobacter capsulatus wild-type strains (37b4, B 10) and mutant strains, lacking lightharvesting (LH) complex II (B800–850) and defective in formation of LH I (B870) complex [U 43 (pTXB 87), U43 (pTXA6-10)] were grown photosynthetically at high and low light intensities in a turbidostate. The mutant strain U43 (pTXA6-10), lacking any LH system, was able to grow at high and low light intensities with doubling times of 4.6 and 9.8 h, respectively. In this mutant the concentration of photochemical reaction centers (RC) per cell and per membrane protein was several times higher than in wild type cells, but the bacteriochlorophyll content, the size of the photosynthetic unit and the rate of photophosphorylation were lower than in wild type cells. Reversible bleaching of reaction center and photophosphorylation were measured under different excitation light intensities. The charge recombination in the RC between the primary donor and QB was very slow in the mutant strains. Two membrane fractions differing in absorption spectra and light saturation behaviour of reversible bleaching and photophosphorylation were isolated from the mutant strains. The experimental data indicate that photosynthetic units of different composition and/or organization are present in the mutant cells.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00252201
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  • 9
    Electronic Resource
    Electronic Resource
    Construction of a gene bank of Rhodopseudomonas capsulata using a broad host range DNA cloning system (1984)
    Springer
    Archives of microbiology 139 (1984), S. 319-325 
    Details
    ISSN: 1432-072X
    Keywords: Gene bank ; Plasmids pRK290 ; pRK2013 ; Rhodopseudomonas capsulata ; Reconstitution ; Phototroph negative mutants ; Absorption spectra ; Light harvesting complexes
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract A gene bank of the phototrophic bacterium Rhodopseudomonas capsulata was constructed using the binary plasmid system pRK290/pRK2013. Fragments of about 20 kb of chromosomal DNA of R. capsulata strain 37b4 were inserted into the cloning vector pRK290. The hybrid plasmids of the gene bank, maintained in Escherichia coli HB101 were transferred by conjugation to R. capsulata strains defective in the photosynthetic apparatus with frequencies of 5×10-4 to 5×10-2. Phototrophically growing transconjugants occurred with frequencies of 5×10-7 to 5×10-6. Recombination between the hybrid plasmids and the R. capsulata chromosome was shown. The hybrid plasmid pRCF1002, carrying a 25 kb insert of R. capsulata wild type DNA, was isolated from one E. coli clone of the gene bank. It reconstituted some bacteriochlorophyll- and photosynthetic negative mutants to phototrophic growth.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00408373
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