Biswas, Avratanu and Akhtar, Parveen and Lambrev, Petar and Stokkum, Ivo H. M. van (2024) Energy transfer from phycobilisomes to photosystem I at room temperature. FRONTIERS IN PLANT SCIENCE, 14. ISSN 1664-462X
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Abstract
The phycobilisomes function as the primary light-harvesting antennae in cyanobacteria and red algae, effectively harvesting and transferring excitation energy to both photosystems. Here we investigate the direct energy transfer route from the phycobilisomes to photosystem I at room temperature in a mutant of the cyanobacterium Synechocystis sp. PCC 6803 that lacks photosystem II. The excitation dynamics are studied by picosecond time-resolved fluorescence measurements in combination with global and target analysis. Global analysis revealed several fast equilibration time scales and a decay of the equilibrated system with a time constant of approximate to 220 ps. From simultaneous target analysis of measurements with two different excitations of 400 nm (chlorophyll a) and 580 nm (phycobilisomes) a transfer rate of 42 ns-1 from the terminal emitter of the phycobilisome to photosystem I was estimated.
| Item Type: | Article |
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| Additional Information: | Funding Agency and Grant Number: National Research, Development and Innovation Fund [NKFI FK-139067, ANN-144012, 2018-1.2.1-NKP-2018-00009]; Hungarian Research Network [SA-76/2021]; LASERLAB-EUROPE [871124]; European Union Funding text: The author(s) declare financial support was received for the research, authorship, and/or publication of this article. This work was supported by grants from the National Research, Development and Innovation Fund (NKFI FK-139067 to PA and ANN-144012 and 2018-1.2.1-NKP-2018-00009 to PL) and the Hungarian Research Network (SA-76/2021 to PA). The research leading to these results has received funding from LASERLAB-EUROPE (grant agreement no. 871124, European Union's Horizon 2020 research and innovation program). |
| Uncontrolled Keywords: | ASSOCIATION; KINETICS; COMPONENTS; CYANOBACTERIA; MUTANT; CHLOROPHYLL; EXCITATION-ENERGY; Phycocyanin; Target analysis; photosystem I (PSI); global analysis (GA); phycobilisomes (PBs); APCD; |
| Subjects: | Q Science / természettudomány > QK Botany / növénytan |
| SWORD Depositor: | MTMT SWORD |
| Depositing User: | MTMT SWORD |
| Date Deposited: | 24 Jan 2025 09:38 |
| Last Modified: | 24 Jan 2025 09:38 |
| URI: | https://real.mtak.hu/id/eprint/214306 |
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