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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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