The role of charge-transfer states in energy transfer and dissipation within natural and artificial bacteriochlorophyll proteins

Wahadoszamen,; Margalit, Iris; Ara, Anjue Mane; Grondelle, Rienk van; Noy, Dror

doi:10.1038/ncomms6287

Cited by 59 publications

(88 citation statements)

References 33 publications

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“…Johnson et al (2011) found that these structural changes occurred rapidly and reversibly within 5 min of illumination and dark relaxation, and were dependent on ΔpH; enhanced by the de-epoxidation of violaxanthin to zeaxanthin. In addition, numerous investigations have sought to identify further substances and mechanisms associated with non-photochemical quenching (Belgio et al, 2014; Wahadoszamen et al, 2014; Gupta et al, 2015; Leverenz et al, 2015). …”

Section: Introductionmentioning

confidence: 99%

Non-photochemical Quenching Plays a Key Role in Light Acclimation of Rice Plants Differing in Leaf Color

et al. 2017

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Non-photochemical quenching (NPQ) is an important photoprotective mechanism in rice; however, little is known regarding its role in the photosynthetic response of rice plants with differing in leaf color to different irradiances. In this study, two rice genotypes containing different chlorophyll contents, namely Zhefu802 (high chlorophyll) and Chl-8 (low chlorophyll), were subjected to moderate or high levels of light intensity at the 6-leaf stage. Chl-8 possessed a lower chlorophyll content and higher chlorophyll a:b ratio compared with Zhefu802, while Pn, Fv/Fm, and ΦPSII contents were higher in Chl-8. Further results indicated that no significant differences were observed in the activities of Rubisco, Mg2+-ATPase, and Ca2+-ATPase between these genotypes. This suggested that no significant difference in the capacity for CO2 assimilation exists between Zhe802 and Chl-8. Additionally, no significant differences in stomatal limitation were observed between the genotypes. Interestingly, higher NPQ and energy quenching (qE), as well as lower photoinhibitory quenching (qI) and production of reactive oxygen species (ROS) was observed in Chl-8 compared with Zhefu802 under both moderate and high light treatments. This indicated that NPQ could improve photosynthesis in rice under both moderate and high light intensities, particularly the latter, whereby NPQ alleviates photodamage by reducing ROS production. Both zeaxanthin content and the expression of PsbS1 were associated with the induction of NPQ under moderate light, while only zeaxanthin was associated with NPQ induction under high light. In summary, NPQ could improve photosynthesis in rice under moderate light and alleviate photodamage under high light via a decrease in ROS generation.

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Section: Introductionmentioning

confidence: 99%

Non-photochemical Quenching Plays a Key Role in Light Acclimation of Rice Plants Differing in Leaf Color

et al. 2017

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“…Finally, Chls are not only used by plant photosystems as efficient light harvesters but also as energy sinks within an antenna complex or the reaction centre. To this end, a Chl-Chl pair is used to create a charge-transfer state, which can rapidly deplete excitation energy in the antenna or initiate the process of charge separation in the reaction centre [11]. Each monomeric subunit of LHC2 binds four additional chromophores, known as carotenoids (see Fig.…”

Section: Introductionmentioning

confidence: 99%

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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“…For example, in LH complexes presenting closely packed chromophoric units, collective excitations of the complex may also present some charge transfer (CT) character between the pigments. Indeed, the involvement of chargetransfer states in the LH2 complex has been proven both experimentally [103,104,105,106,107] and computationally [66,108,109,31,63,98] and it is not unlikely that similar situations could arise also in other LH complexes. When CT states play a role, writing the excitons as linear combinations of local excitations only, as normally done in the exciton model, is no longer sufficient.…”

Section: The Lh Functionmentioning

confidence: 95%

Successes & challenges in the atomistic modeling of light-harvesting and its photoregulation

Cupellini

Bondanza

Nottoli

et al. 2020

Biochimica et Biophysica Acta (BBA) - Bioenergetics

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Light-harvesting is a crucial step of photosynthesis. Its mechanisms and related energetics have been revealed by a combination of experimental investigations and theoretical modeling. The success of theoretical modeling is largely due to the application of atomistic descriptions combining quantum chemistry, classical models and molecular dynamics techniques. Besides the important achievements obtained so far, a complete and quantitative understanding of how the many different light-harvesting complexes exploit their structural specificity is still missing. Moreover, many questions remain unanswered regarding the mechanisms through which light-harvesting is regulated in response to variable light conditions. Here we show that, in both fields, a major role will be played once more by atomistic descriptions, possibly generalized to tackle the numerous time and space scales on which the regulation takes place: going from the ultrafast electronic excitation of the multichromophoric aggregate, through the subsequent conformational changes in the embedding protein, up to the interaction between proteins.

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The role of charge-transfer states in energy transfer and dissipation within natural and artificial bacteriochlorophyll proteins

Cited by 59 publications

References 33 publications

Non-photochemical Quenching Plays a Key Role in Light Acclimation of Rice Plants Differing in Leaf Color

Non-photochemical Quenching Plays a Key Role in Light Acclimation of Rice Plants Differing in Leaf Color

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

Successes & challenges in the atomistic modeling of light-harvesting and its photoregulation

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