Carotenoid to chlorophyll energy transfer in the peridinin–chlorophyll- a –protein complex involves an intramolecular charge transfer state | Zendy

Donatas Zigmantas | Zendy; Roger G. Hiller | Zendy; Villy Sundström | Zendy; Tomáš Polı́vka | Zendy

Open Access

Carotenoid to chlorophyll energy transfer in the peridinin–chlorophyll- a –protein complex involves an intramolecular charge transfer state

Author(s) -

Donatas Zigmantas,

Roger G. Hiller,

Villy Sundström,

Tomáš Polı́vka

Publication year - 2002

Publication title -

proceedings of the national academy of sciences

Language(s) - English

Resource type - Journals

SCImago Journal Rank - 5.011

H-Index - 771

eISSN - 1091-6490

pISSN - 0027-8424

DOI - 10.1073/pnas.262537599

Subject(s) - peridinin , ultrafast laser spectroscopy , intramolecular force , photochemistry , excited state , chemistry , chlorophyll , chlorophyll a , light harvesting complexes of green plants , chemical physics , spectroscopy , carotenoid , photosynthesis , photosystem ii , photosystem i , atomic physics , physics , stereochemistry , biochemistry , fucoxanthin , organic chemistry , quantum mechanics

Carotenoids are, along with chlorophylls, crucial pigments involved in light-harvesting processes in photosynthetic organisms. Details of carotenoid to chlorophyll energy transfer mechanisms and their dependence on structural variability of carotenoids are as yet poorly understood. Here, we employ femtosecond transient absorption spectroscopy to reveal energy transfer pathways in the peridinin-chlorophyll-a-protein (PCP) complex containing the highly substituted carotenoid peridinin, which includes an intramolecular charge transfer (ICT) state in its excited state manifold. Extending the transient absorption spectra toward near-infrared region (600-1800 nm) allowed us to separate contributions from different low-lying excited states of peridinin. The results demonstrate a special light-harvesting strategy in the PCP complex that uses the ICT state of peridinin to enhance energy transfer efficiency.

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