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Light-Quality-Adapted Carotenoid Photoprotection in the Photosystem of Roseiflexus castenholzii.
Hao, Jin-Fang; Qi, Chen-Hui; Yu, Bu-Yang; Wang, Hao-Yi; Gao, Rong-Yao; Yamano, Nami; Ma, Fei; Wang, Peng; Xin, Yue-Yong; Zhang, Chun-Feng; Yu, Long-Jiang; Zhang, Jian-Ping.
Afiliación
  • Hao JF; Key Laboratory of Advanced Light Conversion Materials and Biophotonics, Department of Chemistry, Renmin University of China, Beijing 100872, P. R. China.
  • Qi CH; Photosynthesis Research Center, Key Laboratory of Photobiology, Institute of Botany, Chinese Academy of Sciences, Beijing 100093, P. R. China.
  • Yu BY; National Laboratory of Solid State Microstructures & School of Physics, Nanjing University, Nanjing 210093, China.
  • Wang HY; Key Laboratory of Advanced Light Conversion Materials and Biophotonics, Department of Chemistry, Renmin University of China, Beijing 100872, P. R. China.
  • Gao RY; Key Laboratory of Advanced Light Conversion Materials and Biophotonics, Department of Chemistry, Renmin University of China, Beijing 100872, P. R. China.
  • Yamano N; Key Laboratory of Advanced Light Conversion Materials and Biophotonics, Department of Chemistry, Renmin University of China, Beijing 100872, P. R. China.
  • Ma F; Photosynthesis Research Center, Key Laboratory of Photobiology, Institute of Botany, Chinese Academy of Sciences, Beijing 100093, P. R. China.
  • Wang P; Key Laboratory of Advanced Light Conversion Materials and Biophotonics, Department of Chemistry, Renmin University of China, Beijing 100872, P. R. China.
  • Xin YY; Hangzhou Normal University, 2318 Yuhangtang Road, Cangqian, Yuhang District, Hangzhou 311121, Zhejiang, China.
  • Zhang CF; National Laboratory of Solid State Microstructures & School of Physics, Nanjing University, Nanjing 210093, China.
  • Yu LJ; Photosynthesis Research Center, Key Laboratory of Photobiology, Institute of Botany, Chinese Academy of Sciences, Beijing 100093, P. R. China.
  • Zhang JP; Key Laboratory of Advanced Light Conversion Materials and Biophotonics, Department of Chemistry, Renmin University of China, Beijing 100872, P. R. China.
J Phys Chem Lett ; 15(12): 3470-3477, 2024 Mar 28.
Article en En | MEDLINE | ID: mdl-38512331
ABSTRACT
The photosystem of filamentous anoxygenic phototroph Roseiflexus (Rfl.) castenholzii comprises a light-harvesting (LH) complex encircling a reaction center (RC), which intensely absorbs blue-green light by carotenoid (Car) and near-infrared light by bacteriochlorophyll (BChl). To explore the influence of light quality (color) on the photosynthetic activity, we compared the pigment compositions and triplet excitation dynamics of the LH-RCs from Rfl. castenholzii was adapted to blue-green light (bg-LH-RC) and to near-infrared light (nir-LH-RC). Both LH-RCs bind γ-carotene derivatives; however, compared to that of nir-LH-RC (12%), bg-LH-RC contains substantially higher keto-γ-carotene content (43%) and shows considerably faster BChl-to-Car triplet excitation transfer (10.9 ns vs 15.0 ns). For bg-LH-RC, but not nir-LH-RC, selective photoexcitation of Car and the 800 nm-absorbing BChl led to Car-to-Car triplet transfer and BChl-Car singlet fission reactions, respectively. The unique excitation dynamics of bg-LH-RC enhances its photoprotection, which is crucial for the survival of aquatic anoxygenic phototrophs from photooxidative stress.
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Texto completo: 1 Colección: 01-internacional Base de datos: MEDLINE Asunto principal: Chloroflexi Idioma: En Revista: J Phys Chem Lett Año: 2024 Tipo del documento: Article Pais de publicación: Estados Unidos
Texto completo
Añadir a Mi BVS
Imprimir
XML
PubMed Links
Buscar en Google

Texto completo: 1 Colección: 01-internacional Base de datos: MEDLINE Asunto principal: Chloroflexi Idioma: En Revista: J Phys Chem Lett Año: 2024 Tipo del documento: Article Pais de publicación: Estados Unidos