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Immunochemical Characterization of Porphyridium cruentum B-Phycoerythrin: Proof of Cross-Reaction between Chromophore-Free Apoprotein and Holoprotein-Specific Antibodies

Abstract Antibodies against phycobilisom es of Porphyridium cruentum immunoreact with B-phycoerythrin from the same organism. A strong antigen-antibody complex is not only formed with the native B-phycoerythrin but also when the chromophore is chemically reduced, split or even degraded with chromic acid. Characteristics of precipitations and dissolutions in the presence of the chaotropic reagents urea and potassium rhodanide are discussed for the immunocomplex with native B-phycoerythrin. A sandwich-type immunoadsorbent column appropriate for antigen-isolation is described; its binding properties are investigated biochem ically and by electron microscopy.