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  • Membrane differentiation  (3)
  • Bacteriochlorophyll, emission, absorption  (1)
  • 2020-2022
  • 1980-1984  (3)
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Year
  • 1
    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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  • 2
    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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  • 3
    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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