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Carotenoids in Energy Transfer and Quenching Processes in Pcb and Pcb−PS I Complexes from Prochlorothrix hollandica

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Institute of Physical Biology, University of South Bohemia, Zámek 136, 373 33 Nové Hrady, Czech Republic; Institute of Plant Molecular Biology, Biology Centre, Czech Academy of Sciences, Branišovská 31, České Budějovice, Czech Republic; and Faculty of Science, University of South Bohemia, Branišovská 31, České Budějovice, Czech Republic
* Corresponding author. E-mail: [email protected]
†Institute of Physical Biology, University of South Bohemia.
‡Czech Academy of Sciences.
§Faculty of Science, University of South Bohemia.
⊥Current address: Department of Chemistry, University of Connecticut, Storrs, CT.
∥Current address: The University of Auckland, Thomas Building, Symonds Street, Auckland Central 1010, New Zealand.
Cite this: J. Phys. Chem. B 2010, 114, 28, 9275–9282
Publication Date (Web):June 28, 2010
https://doi.org/10.1021/jp1026724
Copyright © 2010 American Chemical Society

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    Abstract

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    Chlorophyll (Chl) a/b-binding proteins from Prochlorothrix hollandica known as Pcb antennae were studied by femtosecond transient absorption technique to identify energy transfer rates and pathways in Pcb and Pcb−PS I complexes. Carotenoids transfer energy to Chl with low efficiency of ∼25% in Pcb complexes. Interestingly, analysis of transient absorption spectra identified a pathway from the hot S1 state of zeaxanthin and/or β-carotene as the major energy transfer channel between carotenoids and chlorophylls in Pcb whereas the S2 state contributes only marginally to energy transfer. Due to energetic reasons, no energy transfer is possible via the relaxed S1 state of carotenoids. The low overall energy transfer efficiency of carotenoids recognizes chlorophylls as the main light-harvesting pigments. Besides Chl a, presence of Chl b, which transfers energy to Chl a with nearly 100% efficiency, significantly broadens the spectral range accessible for light-harvesting and improves cross section of Pcb complexes. The major role of carotenoids in Pcb is photoprotection.

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    Comparison of excited-state dynamics of Pcb−PS I and PSI complexes, global fitting in carotenoid and Chl a spectral regions, and kinetics measured with different excitation intensities. This material is available free of charge via the Internet at http://pubs.acs.org.

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    This article is cited by 10 publications.

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    8. Nicoletta La Rocca, Isabella Moro, Nicoletta Rascio. Excess Light and Limited Carbon: Two Problems with Which Cyanobacteria and Microalgae Cope. 2016, 369-396. https://doi.org/10.1201/b19498-28
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    10. Yuichi Terazono, Thomas Moore, Ana Moore, Devens Gust. Light Harvesting, Excitation Energy/Electron Transfer and Photoregulation in Artificial Photosynthetic Systems. 2012, 349-387. https://doi.org/10.1201/b11621-8

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