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Spectroscopic Characterization of the Excitation Energy Transfer in the Fucoxanthin–Chlorophyll Protein of Diatoms

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Abstract

We characterized the energy transfer pathways in the fucoxanthin–chlorophyll protein (FCP) complex of the diatom Cyclotella meneghiniana by conducting ultrafast transient absorption measurements. This light harvesting antenna has a distinct pigment composition and binds chlorophyll a (Chl-a), fucoxanthin and chlorophyll c (Chl-c) molecules in a 4:4:1 ratio. We find that upon excitation of fucoxanthin to its S2 state, a significant amount of excitation energy is transferred rapidly to Chl-a. The ensuing dynamics illustrate the presence of a complex energy transfer network that also involves energy transfer from the unrelaxed or ‘hot’ intermediates. Chl-c to Chl-a energy transfer occurs on a timescale of a 100 fs. We observe no significant spectral evolution in the Chl-a region of the spectrum. We have applied global and target analysis to model the measured excited state dynamics and estimate the spectra of the states involved; the energy transfer network is discussed in relation to the pigment organization of the FCP complex.

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Abbreviations

Chl:

chlorophyll

EADS:

evolution-associated difference spectrum

EET:

excitation energy transfer

ESA:

excited-state absorption

FCP:

fucoxanthin–chlorophyll protein

IC:

internal conversion

ICT:

intramolecular charge-transfer

LHC:

light-harvesting complex

PCP:

peridinin–chlorophyll protein

SADS:

species-associated difference spectrum

SE:

stimulated emission

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Correspondence to Emmanouil Papagiannakis.

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Papagiannakis, E., H.M. van Stokkum, I., Fey, H. et al. Spectroscopic Characterization of the Excitation Energy Transfer in the Fucoxanthin–Chlorophyll Protein of Diatoms. Photosynth Res 86, 241–250 (2005). https://doi.org/10.1007/s11120-005-1003-8

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  • DOI: https://doi.org/10.1007/s11120-005-1003-8

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