The efficiency of non-photochemical fluorescence quenching of phycobilisomes by the orange carotenoid protein
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We report on the theoretical efficiency of non-photochemical fluorescence quenching of phycobilisomes by the orange carotenoid protein. The created 3D computer model of the three-cylindrical phycobilisome core allowed us to determine the distances between the centers of mass of all of the phycobilin chromophores of the core and calculate the time and the average number of energy migration steps for the resulting non-radiative excitation transfer from the phycobilisomes to photosystem II. The obtained kinetic scheme equations for the path of the energy transfer confirm the incomplete interception of energy flow in the phycobilisome core by the orange carotenoid protein. The theoretical estimation of the rate of phycobilisome quenching is in good agreement with experimental data.
Keywordsallophycocyanin non-photochemical quenching orange carotenoid protein energy migration phycobilisome fluorescence
orange carotenoid protein
- PS II
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