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Excitation Energy Transfer and Trapping in Higher Plant Photosystem II Complexes with Different Antenna Sizes.
4 May 2011, 5:02 am
Biophysical Society
Excitation Energy Transfer and Trapping in Higher Plant Photosystem II Complexes with Different Antenna Sizes. - http://www.ncbi.nlm.nih.gov/entrez...
May 4, 2011
from pubmed: biophysical journal
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Excitation Energy Transfer and Trapping in Higher Plant Photosystem II Complexes with Different Antenna Sizes. Biophys J. 2011 May 4;100(9):2094-103 Authors: Caffarri S, Broess K, Croce R, van Amerongen H We performed picosecond fluorescence measurements on well-defined Photosystem II (PSII) supercomplexes from Arabidopsis with largely varying antenna sizes. The average excited-state lifetime ranged from 109 ps for PSII core to 158 ps for the largest C(2)S(2)M(2) complex in 0.01% α-DM. Excitation energy transfer and trapping were investigated by
coarse-grained modeling of the fluorescence kinetics. The results reveal a large drop in free energy upon charge separation (>700 cm(-1)) and a slow relaxation of the radical pair to an irreversible state (∼150 ps). Somewhat unexpectedly, we had to reduce the energy-transfer and charge-separation rates in complexes with decreasing size to obtain optimal fits. This strongly suggests that the antenna system is important for plant PSII integrity... - Steve Koch
