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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, 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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  • 2
    ISSN: 0173-0835
    Keywords: Chemistry ; Biochemistry and Biotechnology
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Biology , Chemistry and Pharmacology
    Notes: A new method is presented for the fast preparative separation of the light-harvesting photosynthetic pigment C-phycocanin into its α and β subunits, which is based on isoelectric focusing in layers of granutaled gels containing 7 M urea. The method has been successful in cases where other separation procedures failed. The recovery of the separated chains of the light -sensitive biliprotein amounts to 70 ± 10 % when the separation is carried out under light exclusion and in an argon atmosphere. A simple and inexpensive setup for work under an atmosphere of protective gas is described.
    Additional Material: 2 Ill.
    Type of Medium: Electronic Resource
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