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      Modeling of fluorescence quenching by lutein in the plant light-harvesting complex LHCII.

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          Abstract

          Photoprotective non-photochemical quenching (NPQ) in higher plants is the result of the formation of energy quenching traps in the light-harvesting antenna of photosystem II (PSII). It has been proposed that this quenching trap is a lutein molecule closely associated with the chlorophyll terminal emitter of the major light-harvesting complex LHCII. We have used a combination of time-dependent density functional theory (TD-DFT) and the semiempirical MNDO-CAS-CI method to model the chlorophyll-lutein energy transfer dynamics of the highly quenched crystal structure of LHCII. Our calculations reveal that the incoherent "hopping" of energy from Chla612 to the short-lived, dipole forbidden 2(1)A(g)(-) state of lutein620 accounts for the strong fluorescence quenching observed in these crystals. This adds weight to the argument that the same dissipative pathway is responsible for in vivo NPQ.

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          Author and article information

          Journal
          J Phys Chem B
          The journal of physical chemistry. B
          American Chemical Society (ACS)
          1520-5207
          1520-5207
          Sep 26 2013
          : 117
          : 38
          Affiliations
          [1 ] The School of Biological and Chemical Sciences, Queen Mary, University of London , Mile End Road, London E1 4NS, U.K.
          Article
          10.1021/jp3110997
          23234311
          c2be2841-ea8c-4c8d-8b04-8afe6dd4bca2
          History

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