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 413110
Title The role of the individual Lhcas in photosystem excitation energy trapping
Author(s) Wientjes, E.; Stokkum, I.H.M. van; Amerongen, H. van; Croce, R.
Source Biophysical Journal 101 (2011)3. - ISSN 0006-3495 - p. 745 - 754.
Department(s) Biophysics
Publication type Refereed Article in a scientific journal
Publication year 2011
Keyword(s) light-harvesting complex - pigment-pigment interactions - time-resolved fluorescence - higher-plants - angstrom resolution - antenna complex - chlamydomonas-reinhardtii - arabidopsis-thaliana - charge separation - crystal-structure
Abstract In this work, we have investigated the role of the individual antenna complexes and of the low-energy forms in excitation energy transfer and trapping in Photosystem I of higher plants. To this aim, a series of Photosystem I (sub)complexes with different antenna size/composition/absorption have been studied by picosecond fluorescence spectroscopy. The data show that Lhca3 and Lhca4, which harbor the most red forms, have similar emission spectra (¿(max) = 715-720 nm) and transfer excitation energy to the core with a relative slow rate of ~25/ns. Differently, the energy transfer from Lhca1 and Lhca2, the "blue" antenna complexes, occurs about four times faster. In contrast to what is often assumed, it is shown that energy transfer from the Lhca1/4 and the Lhca2/3 dimer to the core occurs on a faster timescale than energy equilibration within these dimers. Furthermore, it is shown that all four monomers contribute almost equally to the transfer to the core and that the red forms slow down the overall trapping rate by about two times. Combining all the data allows the construction of a comprehensive picture of the excitation-energy transfer routes and rates in Photosystem I.
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