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  • 1975-1979  (2)
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  • 1
    ISSN: 0075-4617
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Bonding between Chromophore and Protein in Biliproteins, I. - Degradation Experiments and Spectral Investigations on BiliproteinsDegradation experiments with nine different biliproteins show that ring A of the chromophore and one of the middle rings (in phycoerythrin identified as ring C) are always covalently linked with the apoprotein. According to spectral investigations, the chromophore of phycoerythrin contains six, and that of phycocyanin nine conjugated double bonds. One additional double bond is formed during splitting of the chromophore with boiling methanol. Partial structure 11 containing the linkage to the apoprotein is proposed for the phycoerythrin chromophore on the basis of kinetics of isomerization to a urobilin.
    Notes: Abbauversuche an neun verschiedenen Biliproteiden zeigen, daß immer jeweils Ring A des Chromophors und einer der mittleren Ringe (bei Phycoerythrinen als Ring C identifiziert) mit dem Protein kovalent verknüpft sind. Nach Spektraluntersuchungen besitzt der Chromophor des Phycoerythrins sechs, der des Phycocyanins neun konjugierte Doppelbindungen. Bei der Abspaltung der Chromophore mit siedendem Methanol kommt jeweils eine Doppelbindung hinzu. Für den Phycoerythrin-Chromophor wird aufgrund der Kinetik der Isomerisierung in ein Urobilin die Teilstruktur 11 vorgeschlagen, die die Bindungsstelle zum Protein berücksichtigt.
    Additional Material: 1 Ill.
    Type of Medium: Electronic Resource
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  • 2
    ISSN: 0075-4617
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Bonding between Chromophore and Protein in Biliproteins, II. - Detection of Cysteine as Binding Amino Acid in B-PhycoerythrinB-Phycoerythrin from Porphyridium cruentum is degraded to bilipeptides by pepsin. The bile pigment is removed by Edman degradation together with N-terminal cysteine from a mixture of small bilipeptides (fraction I). Further pepsin digestion yields a tripeptide (fraction 2) containing the bile pigment, cysteine, valine, and leucine. Edman degradation leads to the red product 1. The thiol group of cysteine was recognized as the binding group at the side chain of Ring A of the bile pigment.
    Notes: B-Phycoerythrin aus Porphyridium cruentum wird mit Pepsin zu Bilipeptiden abgebaut. Aus einem Gemisch kurzkettiger Bilipeplide (Fraktion I) wird der Galienfarbstoff zusammen mil dem N-terminalen Cystein beim Edman-Abbau abgespalten. Der weitere Pepsin-Abbau führt zu einem Tripeptid (Fraktion 2), das den Gallenfarbstoff, Cystein, Valin und Leucin enthält. Beim Edman-Abbau entsteht das rote Produkt 1. Als Bindungstelle an der Seiten- kette von Ring A des Farbstoffs wurde die Thiolgruppe von Cystein ermittelt.
    Additional Material: 2 Ill.
    Type of Medium: Electronic Resource
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