Abstract
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, 1 O 2 , O 2 ·— and · OH, were mainly responsible for the photo-induced processes.
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