Ultrafast excited-state dynamics of Luteins in the major light-harvesting complex LHCII.


Journal

Photochemical & photobiological sciences : Official journal of the European Photochemistry Association and the European Society for Photobiology
ISSN: 1474-9092
Titre abrégé: Photochem Photobiol Sci
Pays: England
ID NLM: 101124451

Informations de publication

Date de publication:
27 Dec 2023
Historique:
received: 05 10 2023
accepted: 23 11 2023
medline: 28 12 2023
pubmed: 28 12 2023
entrez: 27 12 2023
Statut: aheadofprint

Résumé

Carotenoid pigments are known to present a functional versatility when bound to light-harvesting complexes. This versatility originates from a strong correlation between a complex electronic structure and a flexible geometry that is easily tunable by the surrounding protein environment. Here, we investigated how the different L1 and L2 sites of the major trimeric light-harvesting complex (LHCII) of green plants tune the electronic structure of the two embedded luteins, and how this reflects on their ultrafast dynamics upon excitation. By combining molecular dynamics and quantum mechanics/molecular mechanics calculations, we found that the two luteins feature a different conformation around the second dihedral angle in the lumenal side. The s-cis preference of the lutein in site L2 allows for a more planar geometry of the [Formula: see text]-conjugated backbone, which results in an increased degree of delocalization and a reduced excitation energy, explaining the experimentally observed red shift. Despite these remarkable differences, according to surface hopping simulations the two luteins present analogous ultrafast dynamics upon excitation: the bright [Formula: see text] state quickly decays (in [Formula: see text] 50 fs) to the dark intermediate [Formula: see text], eventually ending up in the [Formula: see text] state. Furthermore, by employing two different theoretical approaches (i.e., Förster theory and an excitonic version of surface hopping), we investigated the experimentally debated energy transfer between the two luteins. With both approaches, no evident energy transfer was observed in the ultrafast timescale.

Identifiants

pubmed: 38151602
doi: 10.1007/s43630-023-00518-x
pii: 10.1007/s43630-023-00518-x
doi:

Types de publication

Journal Article

Langues

eng

Sous-ensembles de citation

IM

Subventions

Organisme : H2020 European Research Council
ID : ERC-AdG 786714

Informations de copyright

© 2023. The Author(s).

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Auteurs

Laura Pedraza-González (L)

Dipartimento di Chimica e Chimica Industriale, Università di Pisa, Via G. Moruzzi 13, 56124, Pisa, Italy.

Davide Accomasso (D)

Dipartimento di Chimica e Chimica Industriale, Università di Pisa, Via G. Moruzzi 13, 56124, Pisa, Italy.

Lorenzo Cupellini (L)

Dipartimento di Chimica e Chimica Industriale, Università di Pisa, Via G. Moruzzi 13, 56124, Pisa, Italy.

Giovanni Granucci (G)

Dipartimento di Chimica e Chimica Industriale, Università di Pisa, Via G. Moruzzi 13, 56124, Pisa, Italy.

Benedetta Mennucci (B)

Dipartimento di Chimica e Chimica Industriale, Università di Pisa, Via G. Moruzzi 13, 56124, Pisa, Italy. benedetta.mennucci@unipi.it.

Classifications MeSH