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Friedrich, J. and Scheer, Hugo and Zickendraht-Wendelstadt, Barbara and Haarer, D. (1981): High-Resolution Optical Studies on C-Phycocyanin via Photochemical Hole Burning. In: Journal of the American Chemical Society, Vol. 103: pp. 1030-1035
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Abstract

We have shown that both the native C-phycocyanin and its corresponding free biline chromophore undergo reversible, low-temperature photochemistry. We attribute this photochemistry to reversible proton-transfer processes and utilize the observed photoreaction for photochemical hole burning (PHB). Using narrow-band PHB experiments, we have been able to perform high-resolution optical studies and show that the protein-chromophore assembly forms a very rigid structure. The results lead to the conclusion that the light-induced proton transfer occurs most probably in the triplet state.