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https://hdl.handle.net/20.500.14279/24341
Τίτλος: | Trivial Excitation Energy Transfer to Carotenoids Is an Unlikely Mechanism for Non-photochemical Quenching in LHCII | Συγγραφείς: | Gray, Callum Wei, Tiejun Polívka, Tomáš Daskalakis, Vangelis Duffy, Christopher D P |
Major Field of Science: | Agricultural Sciences | Field Category: | Agriculture Forestry and Fisheries | Λέξεις-κλειδιά: | LHCII;Carotenoid;Energy-dissipation;Non-photochemical quenching (NPQ);Photosystem (PSII);Transient absorption | Ημερομηνία Έκδοσης: | 13-Ιαν-2022 | Πηγή: | Frontiers in Plant Science, 2022, vol. 12, articl. no. 797373 | Volume: | 12 | Περιοδικό: | Frontiers in Plant Science | Περίληψη: | Higher plants defend themselves from bursts of intense light via the mechanism of Non-Photochemical Quenching (NPQ). It involves the Photosystem II (PSII) antenna protein (LHCII) adopting a conformation that favors excitation quenching. In recent years several structural models have suggested that quenching proceeds via energy transfer to the optically forbidden and short-lived S 1 states of a carotenoid. It was proposed that this pathway was controlled by subtle changes in the relative orientation of a small number of pigments. However, quantum chemical calculations of S 1 properties are not trivial and therefore its energy, oscillator strength and lifetime are treated as rather loose parameters. Moreover, the models were based either on a single LHCII crystal structure or Molecular Dynamics (MD) trajectories about a single minimum. Here we try and address these limitations by parameterizing the vibronic structure and relaxation dynamics of lutein in terms of observable quantities, namely its linear absorption (LA), transient absorption (TA) and two-photon excitation (TPE) spectra. We also analyze a number of minima taken from an exhaustive meta-dynamical search of the LHCII free energy surface. We show that trivial, Coulomb-mediated energy transfer to S 1 is an unlikely quenching mechanism, with pigment movements insufficiently pronounced to switch the system between quenched and unquenched states. Modulation of S 1 energy level as a quenching switch is similarly unlikely. Moreover, the quenching predicted by previous models is possibly an artifact of quantum chemical over-estimation of S 1 oscillator strength and the real mechanism likely involves short-range interaction and/or non-trivial inter-molecular states. | URI: | https://hdl.handle.net/20.500.14279/24341 | ISSN: | 1664462X | DOI: | 10.3389/fpls.2021.797373 | Rights: | Attribution-NonCommercial-NoDerivatives 4.0 International | Type: | Article | Affiliation: | Queen Mary University of London University of South Bohemia Cyprus University of Technology |
Εμφανίζεται στις συλλογές: | Άρθρα/Articles |
Αρχεία σε αυτό το τεκμήριο:
Αρχείο | Περιγραφή | Μέγεθος | Μορφότυπος | |
---|---|---|---|---|
fpls-12-797373.pdf | Fulltext | 1.6 MB | Adobe PDF | Δείτε/ Ανοίξτε |
Data_Sheet_1_Trivial Excitation Energy Transfer to Carotenoids Is an Unlikely Mechanism for Non-photochemical Quenching in LHCII.pdf | Supplement | 97.95 kB | Adobe PDF | Δείτε/ Ανοίξτε |
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