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Photo-induced interactions of hypocrellin A with phycobiliproteins

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Photo-induced interaction of hypocrellin A (HA) with a water-soluble protein (C-phycocyanin, C-PC) was studied by monitoring the changes of the photo-physical properties of C-PC, as well as those of HA. It was found that the solubility of HA in phosphate-buffered saline solution was greatly promoted in the presence of C-PC. Furthermore, energy transfer from HA to C-PC was detected by deconvoluted fluorescence spectra. These results suggest formation of a complex via weak interaction between HA and C-PC. The photosensitization of HA resulted not only in the photo-damage of C-PC but also in the photo-bleaching of HA in the presence of oxygen, while it did not in the absence of oxygen, suggesting that the oxygenic active species, 1O2, O2·— and ·OH, were mainly responsible for the photo-induced processes.


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