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  • 1
    Electronic Resource
    Electronic Resource
    Physiological factors determining formation of plastocyanin and plastidic cytochrome c-553 in Scenedesmus (1980)
    Springer
    Planta 147 (1980), S. 330-334 
    Details
    ISSN: 1432-2048
    Keywords: Cytochrome c-553 ; Photophosphorylation (cyclic) ; Plastidic cytochrome c-553 ; Plastocyanin induction ; Scenedesmus
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract Physiological conditions necessary for the formation of plastocyanin and the concurrent cessation of cytochrome c-553 formation were studied in cells of copper-deficient Scenedesmus acutus after the addition of copper. Plastocyanin is formed after a lag-phase, leaving constant the content of plastidic cytochrome c-553. Therefore, the concentration of plastocyanin per cell increases and the concentration of cytochrome c-553 decreases during growth. Formation of plastocyanin during the induction period studied is dependent on light intensity. In the dark, there is a 90% inhibition, whereas under light intensities above 50 Wm-2, a ratio of 1.3 molecules plastocyanin per 1,000 molecules chlorophyll is attained. Plastocyanin formations is inhibited by the uncoupler carbonylcyanide-p-trifluoromethoxy phenylhydrazone (FCCP), but not by moderate concentrations of 3-[3′,4′-dichlorophenyl]-1,1-dimethylurea (DCMU), and by keeping the algae under a nitrogen atmosphere without CO2. Concurrently, the cultures treated with FCCP show a decreased endogenous ATP level. The ATP is necessary for plastocyanin formation.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00379841
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  • 2
    Electronic Resource
    Electronic Resource
    Formation of plastocyanin and cytochrome c-553 in different species of blue-green algae (1986)
    Springer
    Archives of microbiology 145 (1986), S. 76-79 
    Details
    ISSN: 1432-072X
    Keywords: Plastocyanin ; Cytochrome c-553 ; Cu regulation ; Blue-green algae ; cyanobacteria
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract Fifteen species from different genera of blue-green algae have been examined for their formation of plastocyanin (PC) and cytochrome c-553 (cyt c-553) in high or low Cu media. In addition to species which contain only cyt c-553 and those which completely exchange their cyt c-553 by PC, a new regulatory type was detected in which this exchange was incomplete. By comparing different species, it could be shown that either this incomplete exchange of cyt c-553 by PC as well as lack of PC in some other blue-green algae is not caused by restricted Cu uptake but is due to different biosynthetic and regulatory properties. Occurrence of PC and cyt c-553 cannot be used as a taxonomic criterium to classify blue-green algae. However, formation of either one or both of these redox components fits well into a line of evolution of the photosynthetic apparatus from the blue-green algae via green algae to higher plants.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00413030
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    Paper (German National Licenses)
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  • 3
    Electronic Resource
    Electronic Resource
    Distribution of plastocyanin and soluble plastidic cytochrome c in various classes of algae (1983)
    Springer
    Archives of microbiology 134 (1983), S. 23-27 
    Details
    ISSN: 1432-072X
    Keywords: Plastocyanin ; Cytochrome exchange ; Algal taxonomy ; Chlorella
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract Several eukaryotic algae belonging to the main taxonomic classes have been cultured autotrophically in liquid medium supplemented with or depleted of copper to assay their ability to form plastocyanin or exchange it against plastidic cytochrome c-553. Most Chlorophyceae are able to substitute cytochrome c-533 for plastocyanin with some exceptions like Haematococcus or Dunaliella, which can only synthesize plastocyanin. Also within the Chlorella group, about half of the 28 strains assayed cannot synthesize cytochrome c-553 under copper deficiency. Species of Chrysophyceae, Xanthophyceae, and Rhodophyceae, on the other hand, cannot synthesize plastocyanin even when a comparatively high copper concentration (10μM) is available. Serological cross-reactions of various plastocyanincontaining Chlorella homogenates against an antibody towards Scenedesmus plastocyanin exhibit a pattern which cannot be taxonomically used at the moment. Including previous data on blue-green algae, it appears that, in the course of evolution, cytochrome c-553 dominates in the older species. In the Chlorophyceae, it is mutually exchangeable against plastocyanin which becomes the only electron donor to P700 in higher plants.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00429401
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    Paper (German National Licenses)
    Fulltext
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