Light-harvesting and structural organization of Photosystem II: From individual complexes to thylakoid membrane

Croce, Roberta; Amerongen, Herbert van

doi:10.1016/j.jphotobiol.2011.02.015

Cited by 165 publications

(126 citation statements)

References 168 publications

(248 reference statements)

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“…For this reason it is called the terminal emitter cluster. Not surprisingly, this cluster also neighbours other LHCs in the antenna network of Photosystem 2 of plants and is therefore the preferred terminal site of LHC2 [20,21].…”

Section: Introductionmentioning

confidence: 90%

Design principles of natural light-harvesting as revealed by single molecule spectroscopy

Krüger

Grondelle

2016

Physica B: Condensed Matter

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Biology offers a boundless source of adaptation, innovation, and inspiration. A wide range of photosynthetic organisms exist that are capable of harvesting solar light in an exceptionally efficient way, using abundant and low-cost materials. These natural light-harvesting complexes consist of proteins that strongly bind a high density of chromophores to capture solar photons and rapidly transfer the excitation energy to the photochemical reaction centre. The amount of harvested light is also delicately tuned to the level of solar radiation to maintain a constant energy throughput at the reaction centre and avoid the accumulation of the products of charge separation. In this Review, recent developments in the understanding of light harvesting by plants will be discussed, based on results obtained from single molecule spectroscopy studies. Three design principles of the main light-harvesting antenna of plants will be highlighted: (a) fine, photoactive control over the intrinsic protein disorder to efficiently use intrinsically available thermal energy dissipation mechanisms; (b) the design of the protein microenvironment of a low-energy chromophore dimer to control the amount of shade absorption; (c) the design of the exciton manifold to ensure efficient funneling of the harvested light to the terminal emitter cluster.

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Section: Introductionmentioning

confidence: 90%

Design principles of natural light-harvesting as revealed by single molecule spectroscopy

Krüger

Grondelle

2016

Physica B: Condensed Matter

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“…This is representative of higher plants or green algae [19]. The reaction centre, once photoexcited, initiates photosynthetic energy transduction via a series of electron transfer reactions.…”

Section: Introductionmentioning

confidence: 99%

Photosynthetic light harvesting: excitons and coherence

Fassioli

Dinshaw

Arpin

et al. 2014

J. R. Soc. Interface.

269

297

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Photosynthesis begins with light harvesting, where specialized pigmentprotein complexes transform sunlight into electronic excitations delivered to reaction centres to initiate charge separation. There is evidence that quantum coherence between electronic excited states plays a role in energy transfer. In this review, we discuss how quantum coherence manifests in photosynthetic light harvesting and its implications. We begin by examining the concept of an exciton, an excited electronic state delocalized over several spatially separated molecules, which is the most widely available signature of quantum coherence in light harvesting. We then discuss recent results concerning the possibility that quantum coherence between electronically excited states of donors and acceptors may give rise to a quantum coherent evolution of excitations, modifying the traditional incoherent picture of energy transfer. Key to this (partially) coherent energy transfer appears to be the structure of the environment, in particular the participation of non-equilibrium vibrational modes. We discuss the open questions and controversies regarding quantum coherent energy transfer and how these can be addressed using new experimental techniques.

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“…These bind a large array of chlorophylls (Chls) that are tightly connected to yield more than 80% quantum efficiency of photochemical reactions [1]. Under stable light conditions, plants optimize the efficiency of photosynthetic machinery and yet light intensity changes during the day and the rapid fluctuations imposed by shading in the canopy or by clouds, easily result in over-excitation.…”

Section: Introductionmentioning

confidence: 99%

On the origin of a slowly reversible fluorescence decay component in the Arabidopsis npq4 mutant

Dall’Osto

Cazzaniga

Wada

et al. 2014

Phil. Trans. R. Soc. B

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Over-excitation of photosynthetic apparatus causing photoinhibition is counteracted by non-photochemical quenching (NPQ) of chlorophyll fluorescence, dissipating excess absorbed energy into heat. The PsbS protein plays a key role in this process, thus making the PsbS-less npq4 mutant unable to carry out qE, the major and most rapid component of NPQ. It was proposed that npq4 does perform qE-type quenching, although at lower rate than WT Arabidopsis. Here, we investigated the kinetics of NPQ in PsbS-depleted mutants of Arabidopsis. We show that red light was less effective than white light in decreasing maximal fluorescence in npq4 mutants. Also, the kinetics of fluorescence dark recovery included a decay component, qM, exhibiting the same amplitude and half-life in both WT and npq4 mutants. This component was uncouplersensitive and unaffected by photosystem II repair or mitochondrial ATP synthesis inhibitors. Targeted reverse genetic analysis showed that traits affecting composition of the photosynthetic apparatus, carotenoid biosynthesis and state transitions did not affect qM. This was depleted in the npq4phot2 mutant which is impaired in chloroplast photorelocation, implying that fluorescence decay, previously described as a quenching component in npq4 is, in fact, the result of decreased photon absorption caused by chloroplast relocation rather than a change in the activity of quenching reactions.

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Light-harvesting and structural organization of Photosystem II: From individual complexes to thylakoid membrane

Cited by 165 publications

References 168 publications

Design principles of natural light-harvesting as revealed by single molecule spectroscopy

Design principles of natural light-harvesting as revealed by single molecule spectroscopy

Photosynthetic light harvesting: excitons and coherence

On the origin of a slowly reversible fluorescence decay component in the Arabidopsis npq4 mutant

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