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Carotenoid-chlorophyll energy transfer in the fucoxanthin-chlorophyll complex binding a fucoxanthin acyloxy derivative

Abstract

Fucoxanthin-chlorophyll a protein from Emiliania huxleyi (E-FCP) is a member of the LHC family of light-harvesting proteins. It has rather unusual pigment composition as its binds more Chl-c than Chl-a, and 19’-hexanoyloxyfucoxanthin (hFx) as the main carotenoid instead of fucoxanthin (Fx) typically found in various FCP complexes. The presence of hexanoyloxy tail in hFx suppresses the charge transfer character of the S1/ICT state resulting in almost no effect of polarity on excited state dynamics of hFx, strongly contrasting with excited-state properties of Fx. Here we report on dynamics of energy transfer between hFx and Chl in E-FCP and we compare it with Fx-Chl energy transfer in the FCP complex from Phaeodactylum tricornutum. In both complexes, the excited hFx (Fx) transfers energy from the S2 state with sub-100 fs time constant and no effect of hexanoyloxy tail on efficiency of the S2 route was found. The energy transfer via the S1/ICT state has in E-FCP two channels characterized by 1.5 and 11 ps time constants, while for FCP these two channels operates with time constants of 0.8 and 4.5 ps. Thus, minimizing the charge transfer character of the S1/ICT in hFx results in about twice slower energy transfer via the S1/ICT state, underlining the importance of the ICT state in facilitating carotenoid-Chl energy transfer in systems utilizing keto carotenoids as energy donors.

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Publication details

The article was accepted on 29 Nov 2018 and first published on 29 Nov 2018


Article type: Paper
DOI: 10.1039/C8FD00193F
Citation: Faraday Discuss., 2018, Accepted Manuscript
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    Carotenoid-chlorophyll energy transfer in the fucoxanthin-chlorophyll complex binding a fucoxanthin acyloxy derivative

    H. Staleva-Musto, R. G. West, M. Trathnigg, D. Bina, R. Litvin and T. Polivka, Faraday Discuss., 2018, Accepted Manuscript , DOI: 10.1039/C8FD00193F

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