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  • 1
    Electronic Resource
    Electronic Resource
    Springer
    Archives of microbiology 112 (1977), S. 61-67 
    ISSN: 1432-072X
    Keywords: Phycobilisomes ; Isolation methods ; Phycobiliproteins ; Accessory photosynthetic pigments ; Rhodella violacea ; Rhodophyceae
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract Disc-shaped phycobilisomes were purified from Triton X100 treated cell homogenates of the unicellular marine red alga, Rhodella violacea. Their absorption spectrum had principal maxima at 544 and 568 nm (B-phycoerythrin), 624 nm (C-phycocyanin) and a distinct shoulder at 652 nm (allophycocyanin). Intermolecular energy transfer within the phycobilisomes was clearly demonstrated by fluorescence data. Excited at 546 nm intact phycobilisomes showed a main fluorescence emission maximum at 665 nm, a minor one at 577 nm and a shoulder at 730 nm. Dissociated phycobilisomes revealed a composition of 58% B-phycoerythrin, 25% C-phycocyanin and 17% allophycocyanin under the cultural conditions used. Analytical methods resolved no other components than phycobiliproteins. In addition to the defined C-phycocyanin and two isoproteins of B-phycoerythrin a stable heterogeneous aggregate of B-phycoerythrin/C-phycocyanin was separated in considerable amounts. In the electron microscope negatively stained phycobilisomes appeared as elliptical aggregates having dimensions slightly above the values found in ultrathin sections and a detailed subunit structure. All observations and data suggest a new rhodophytan phycobilisome type in Rhodella violacea.
    Type of Medium: Electronic Resource
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  • 2
    Electronic Resource
    Electronic Resource
    Springer
    Archives of microbiology 100 (1974), S. 253-270 
    ISSN: 1432-072X
    Keywords: Phycobiliproteins ; Rhodophyceae
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Description / Table of Contents: Zusammenfassung 1. Die Zusammensetzung des Phycobiliproteidgehalts der einzelligen marinen Rotalge Rhodella violacea wurde untersucht. 2. Eine Methode zur Massenanzucht der Alge wird vorgestellt. 3. Die Isolierung und Reinigung der Phycobiliproteide aus Rohextrakten im Anschluß an die Ultraschallfraktionierung der Zellen erfolgte durch Gel- und Ionenaustauschchromatographie. 4. Das Vorkommen von B-Phycoerythrin, C-Phycocyanin und Allophycocyanin konnte für Rhodella violacea nachgewiesen werden. 5. Der hohe Reinheitsgrad der isolierten nativen Phycobiliproteide erlaubte ihre Charakterisierung durch Spektraldaten (Absorptionsspektren, Extinktionsverhältnisse und Fluorescenz-Emissionsspektren) und durch Bestimmung ihrer Molekulargewichte und isoelektrischen Punkte; die letzteren wurden mit 4,39, 4,46 und 4,79 für B-Phycoerythrin I, C-Phycocyanin bzw. Allophycocyanin ermittelt. 6. Die Phycobiliproteidkomposition unterscheidet Rhodella violacea deutlich von den Arten der Gattung Porphyridium und unterstützt damit die kürzlich vorgeschlagene Trennung von dieser Gattung.
    Notes: Abstract The phycobiliproteins of the unicellular marine red alga, Rhodella violacea, were investigated. A method of mass culture of the alga is presented. B-phycoerythrin, C-phycocyanin, and allophycocyanin were isolated from crude extracts by the combination of gel and ion exchange chromatography. The highly purified native phycobiliproteins were characterized by absorption spectra, absorption ratios, and fluorescence emission spectra, molecular weights, and isoelectric points. The latter were found to be 4.39, 4.46, and 4.79 for B-phycoerythrin I, C-phycocyanin, and allophycocyanin, respectively. The phycobiliprotein composition clearly distinguishes Rhodella violacea from Porphyridium aerugineum and P. cruentum, thus, supporting the separation of Rhodella violacea from the genus Porphyridium recently proposed.
    Type of Medium: Electronic Resource
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