Absence of far-red emission band in aggregated core antenna complexes.

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Abstrakt

Tytuł:: Absence of far-red emission band in aggregated core antenna complexes.
Autorzy:: Ara AM; Biophysics of Photosynthesis, Department of Physics and Astronomy, Faculty of Sciences, VU University Amsterdam, Amsterdam, the Netherlands; Department of Physics, Jagannath University, Dhaka, Bangladesh.
Ahmed MK; Department of Physics, Jagannath University, Dhaka, Bangladesh.
D'Haene S; Biophysics of Photosynthesis, Department of Physics and Astronomy, Faculty of Sciences, VU University Amsterdam, Amsterdam, the Netherlands.
van Roon H; Biophysics of Photosynthesis, Department of Physics and Astronomy, Faculty of Sciences, VU University Amsterdam, Amsterdam, the Netherlands.
Ilioaia C; Institute for Integrative Biology of the Cell, CEA, CNRS, Université Paris-Saclay, Gif-sur-Yvette, France.
van Grondelle R; Biophysics of Photosynthesis, Department of Physics and Astronomy, Faculty of Sciences, VU University Amsterdam, Amsterdam, the Netherlands.
Wahadoszamen M; Biophysics of Photosynthesis, Department of Physics and Astronomy, Faculty of Sciences, VU University Amsterdam, Amsterdam, the Netherlands; Department of Physics, University of Dhaka, Dhaka, Bangladesh. Electronic address: .
Źródło:: Biophysical journal [Biophys J] 2021 May 04; Vol. 120 (9), pp. 1680-1691. Date of Electronic Publication: 2021 Mar 04.
Typ publikacji:: Journal Article; Research Support, Non-U.S. Gov't
Język:: English
Imprint Name(s):: Publication: Cambridge, MA : Cell Press
Original Publication: New York, Published by Rockefeller University Press [etc.] for the Biophysical Society.
MeSH Terms:: Chlorophyll*
Photosystem II Protein Complex*/metabolism
Carotenoids ; Energy Transfer ; Light-Harvesting Protein Complexes/metabolism ; Spectrometry, Fluorescence
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Substance Nomenclature:: 0 (Light-Harvesting Protein Complexes)
0 (Photosystem II Protein Complex)
1406-65-1 (Chlorophyll)
36-88-4 (Carotenoids)
Entry Date(s):: Date Created: 20210306 Date Completed: 20210531 Latest Revision: 20220506
Update Code:: 20240104
PubMed Central ID:: PMC8204212
DOI:: 10.1016/j.bpj.2021.02.037
PMID:: 33675767
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Reported herein is a Stark fluorescence spectroscopy study performed on photosystem II core antenna complexes CP43 and CP47 in their native and aggregated states. The systematic mathematical modeling of the Stark fluorescence spectra with the aid of conventional Liptay formalism revealed that induction of aggregation in both the core antenna complexes via detergent removal results in a single quenched species characterized by a remarkably broad and inhomogenously broadened emission lineshape peaking around 700 nm. The quenched species possesses a fairly large magnitude of charge-transfer character. From the analogy with the results from aggregated peripheral antenna complexes, the quenched species is thought to originate from the enhanced chlorophyll-chlorophyll interaction due to aggregation. However, in contrast, aggregation of both core antenna complexes did not produce a far-red emission band at ∼730 nm, which was identified in most of the aggregated peripheral antenna complexes. The 730-nm emission band of the aggregated peripheral antenna complexes was attributed to the enhanced chlorophyll-carotenoid (lutein1) interaction in the terminal emitter locus. Therefore, it is very likely that the no occurrence of the far-red band in the aggregated core antenna complexes is directly related to the absence of lutein1 in their structures. The absence of the far-red band also suggests the possibility that aggregation-induced conformational change of the core antenna complexes does not yield a chlorophyll-carotenoid interaction associated energy dissipation channel.
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