Staff Publications

Staff Publications

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    'Staff publications' is the digital repository of Wageningen University & Research

    'Staff publications' contains references to publications authored by Wageningen University staff from 1976 onward.

    Publications authored by the staff of the Research Institutes are available from 1995 onwards.

    Full text documents are added when available. The database is updated daily and currently holds about 240,000 items, of which 72,000 in open access.

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Record number 349552
Title Excitation energy transfer and charge separation in photosystem II membranes revisited
Author(s) Broess, K.; Trinkunas, G.; Weij-de Wit, C.D. van der; Dekker, J.P.; Hoek, A. van; Amerongen, H. van
Source Biophysical Journal 91 (2006)10. - ISSN 0006-3495 - p. 3776 - 3786.
Department(s) Biophysics
Publication type Refereed Article in a scientific journal
Publication year 2006
Keyword(s) chlorophyll-protein complexes - light-harvesting complex - thylakoid membranes - target analysis - electron-donor - quantum yield - antenna size - green plants - fluorescence - kinetics
Abstract We have performed time-resolved fluorescence measurements on photosystem II (PSII) containing membranes (BBY particles) from spinach with open reaction centers. The decay kinetics can be fitted with two main decay components with an average decay time of 150 ps. Comparison with recent kinetic exciton annihilation data on the major light-harvesting complex of PSII (LHCII) suggests that excitation diffusion within the antenna contributes significantly to the overall charge separation time in PSII, which disagrees with previously proposed trap-limited models. To establish to which extent excitation diffusion contributes to the overall charge separation time, we propose a simple coarse-grained method, based on the supramolecular organization of PSII and LHCII in grana membranes, to model the energy migration and charge separation processes in PSII simultaneously in a transparent way. All simulations have in common that the charge separation is fast and nearly irreversible, corresponding to a significant drop in free energy upon primary charge separation, and that in PSII membranes energy migration imposes a larger kinetic barrier for the overall process than primary charge separation
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