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The α-subunit of phycoerythrocyanin (α-PEC) can exist in four states (Z-α I , Z-α II ,E -α I , E-α II ). They are connected pairwise by photoreversible photochromism. The type I photochemistry connecting Z-α I and E-α I , involves aI5ZE phototransformation. α-PEC showing this type of photochemistry is obtained when the subunits of PEC are...
Type I reversible photochemistry of the α-subunit of phycoerythrocyanin (α-PEC) from the cyanobacterium, Mastigocladus laminosus, and of chromopeptides derived from both states, was studied by UV-Vis absorption and 1 H-NMR spectroscopy. (1) Peptic peptides bearing the two isomeric chromophores were separated by chromatography in acid medium on Bio-Gel P10. This allowed a quantitation of...
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