How orange carotenoid protein controls the excited state dynamics of canthaxanthin
Amanda Arcidiacono, Davide Accomasso, Lorenzo Cupellini, Benedetta Mennucci
Abstract
state, and we characterize its nature. For the latter step, we reveal an excited state decay characterized by multiple timescales, which are related to the ground-state conformational heterogeneity of the ketocarotenoid. We assigned the slowly decaying population to the so-called S* state. Finally, we identify a minor decay pathway involving double-bond photoisomerization, which could be the initial trigger to photoactivation of OCP.
Topics & Concepts
Excited statePhotoprotectionPhotochemistryCanthaxanthinChemistryPopulationGround statePhotoisomerizationChemical physicsBiophysicsAtomic physicsCarotenoidPhysicsBiologyIsomerizationBiochemistryPhotosynthesisDemographySociologyCatalysisAstaxanthinPhotosynthetic Processes and MechanismsPlant and animal studiesAntioxidant Activity and Oxidative Stress