Energy transfer and trapping in photosystem I with and without chlorophyll-f

Van Stokkum, Ivo H. M.; Müller, Marc G.; Weißenborn, Jorn; Weigand, Sebastian; Snellenburg, Joris J.; Holzwarth, Alfred R.

doi:10.1016/j.isci.2023.107650

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Energy transfer and trapping in photosystem I with and without chlorophyll-<i>f</i>

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Holzwarth, Alfred R.
Research Department Schlögl, Max Planck Institute for Chemical Energy Conversion, Max Planck Society;

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Citation

Van Stokkum, I. H. M., Müller, M. G., Weißenborn, J., Weigand, S., Snellenburg, J. J., & Holzwarth, A. R. (2023). Energy transfer and trapping in photosystem I with and without chlorophyll-<i>f</i>. iScience, 26(9): 107650, pp. 1-15. doi:10.1016/j.isci.2023.107650.

Cite as: https://hdl.handle.net/21.11116/0000-000D-DC18-1

Abstract

We establish a general kinetic scheme for energy transfer and trapping in the photosystem I (PSI) of cyanobacteria grown under white light (WL) or far-red light (FRL) conditions. With the help of simultaneous target analysis of all emission and transient absorption datasets measured in five cyanobacterial strains, we resolved the spectral and kinetic properties of the different species present in PSI. WL-PSI can be described by Bulk Chl a, two Red Chl a, and a reaction center compartment (WL-RC). The FRL-PSI contains two additional Chl f compartments. The lowest excited state of the FRL-RC is downshifted by approximate to 29 nm. The rate of charge separation drops from approximate to 900 ns(-1) in WL-RC to approximate to 300 ns(-1) in FRL-RC. The delayed trapping in the FRL-PSI (approximate to 130 ps) is explained by uphill energy transfer from the Chl f compartments with Gibbs free energies of approximate to k(B)T below that of the FRL-RC.