Site-Directed Mutagenesis of the Chlorophyll-Binding Sites Modulates Excited-State Lifetime and Chlorophyll–Xanthophyll Energy Transfer in the Monomeric Light-Harvesting Complex CP29

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Site-Directed Mutagenesis of the Chlorophyll-Binding Sites Modulates Excited-State Lifetime and Chlorophyll–Xanthophyll Energy Transfer in the Monomeric Light-Harvesting Complex CP29

08Apr

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Samim Sardar, Roberto Caferri, Franco V. A. Camargo, Stefano Capaldi, Alberto Ghezzi, Luca Dall’Osto, Cosimo D’Andrea, Giulio Cerullo, and Roberto Bassi

We combine site-directed mutagenesis with picosecond time-resolved fluorescence and femtosecond transient absorption (TA) spectroscopies to identify excitation energy transfer (EET) processes between chlorophylls (Chls) and xanthophylls (Xant) in the minor antenna complex CP29 assembled inside nanodiscs, which result in quenching. Our study provides experimental evidence that multiple Chl–Xant interactions are involved in the quenching activity of CP29.

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