Energy transfer and trapping in $Synechococcus$ WH 7803 - Archive ouverte HAL Accéder directement au contenu
Article Dans Une Revue Photosynthesis Research Année : 2018

Energy transfer and trapping in $Synechococcus$ WH 7803

Résumé

Excitation energy transfer (EET) and trapping in $Synechococcus$ WH 7803 whole cells and isolated photosystem I (PSI) complexes have been studied by time-resolved emission spectroscopy at room temperature (RT) and at 77 K. With the help of global and target analysis, the pathways of EET and the charge separation dynamics have been identified. Energy absorbed in the phycobilisome (PB) rods by the abundant phycoerythrin (PE) is funneled to phycocyanin (PC645) and from there to the core that contains allophycocyanin (APC660 and APC680). Intra-PB EET rates have been estimated to range from 11 to 68/ns. It was estimated that at RT, the terminal emitter of the phycobilisome, APC680, transfers its energy at a rate of 90/ns to PSI and at a rate of 50/ns to PSII. At 77 K, the redshifted Chl $a$ states in the PSI core were heterogeneous, with maximum emission at 697 and 707 nm. In 72% of the PSI complexes, the bulk Chl $a$ in equilibrium with F697 decayed with a main trapping lifetime of 39 ps.
Fichier principal
Vignette du fichier
ACu.pdf (1.54 Mo) Télécharger le fichier
Origine : Fichiers éditeurs autorisés sur une archive ouverte
Loading...

Dates et versions

hal-02175117 , version 1 (07-02-2020)

Identifiants

Citer

Alonso M. Acuña, Claire Lemaire, Rienk Van Grondelle, Bruno Robert, Ivo H. M. Van Stokkum. Energy transfer and trapping in $Synechococcus$ WH 7803. Photosynthesis Research, 2018, 135 (1-3), pp.115-124. ⟨10.1007/s11120-017-0451-2⟩. ⟨hal-02175117⟩
44 Consultations
39 Téléchargements

Altmetric

Partager

Gmail Facebook X LinkedIn More