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Hybrid System Based on Quantum Dots and Photosystem 2 Core Complex

E. G. Maksimov1*, V. N. Kurashov2, M. D. Mamedov2, and V. Z. Paschenko1

1Department of Biophysics, Biology Faculty, Lomonosov Moscow State University, 119991 Moscow, Russia; fax: (495) 939-1115; E-mail: emaksimoff@yandex.ru

2Belozersky Institute of Physico-Chemical Biology, Lomonosov Moscow State University, 119991 Moscow, Russia; fax: (495) 939-3181

* To whom correspondence should be addressed.

Received February 28, 2012; Revision received March 16, 2012
We show that semiconductor nanocrystals (quantum dots, QD) can be used to increase the absorption capacity of pigment–protein complexes. In a mixture of photosystem 2 core complex (PS2) and QD, the fluorescence of the latter decreases several-fold due to the transfer of the absorbed energy to the PS2 core complex. We discuss Förster’s inductive-resonance mechanism as a possible way of energy transfer in donor–acceptor pairs QD–PS2 core complex. Calculations based on the experimental data show that the enhancement of PS2 fluorescence and the rate of QA reduction increase up to 60% due to efficient energy migration from QD to PS2.
KEY WORDS: quantum dots, photosystem 2, hybrid systems, energy transfer

DOI: 10.1134/S0006297912060090