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• W4386935997 endingPage "149014" @default.
• W4386935997 startingPage "149014" @default.
• W4386935997 abstract "Phycobilisomes (PBSs) are giant water-soluble light-harvesting complexes of cyanobacteria and red algae, consisting of hundreds of phycobiliproteins precisely organized to deliver the energy of absorbed light to chlorophyll chromophores of the photosynthetic electron-transport chain. Quenching the excess of excitation energy is necessary for the photoprotection of photosynthetic apparatus. In cyanobacteria, quenching of PBS excitation is provided by Orange Carotenoid Protein (OCP), which activates under high light conditions. In this work, we describe the parameters of anti-Stokes fluorescence of cyanobacterial PBSs in quenched and unquenched states. We compare fluorescence readout from entire phycobilisomes and their fragments. The obtained results revealed the heterogeneity of conformations of chromophores in isolated phycobiliproteins, while such heterogeniety was not observed in the entire PBS. Under excitation by low energy quanta, we did not detect the significant uphill energy transfer from the core to the peripheral rods of PBS, while the one from the terminal emitters to the bulk allophycocyanin chromophores is highly probable. We show that this direction of energy migration does not eliminate fluorescence quenching in the complex with OCP. Thus, long-wave excitation provides new insights into the pathways of energy conversion in the phycobilisome." @default.
• W4386935997 created "2023-09-22" @default.
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• W4386935997 date "2024-01-01" @default.
• W4386935997 modified "2023-10-13" @default.
• W4386935997 title "Anti-stokes fluorescence of phycobilisome and its complex with the orange carotenoid protein" @default.
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• W4386935997 doi "https://doi.org/10.1016/j.bbabio.2023.149014" @default.
• W4386935997 hasPubMedId "https://pubmed.ncbi.nlm.nih.gov/37739300" @default.
• W4386935997 hasPublicationYear "2024" @default.
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