Modeling of Emission Spectra for Molecular Rings - LH2 And LH4 Complexes

Horák, M.; Heřman, Pavel; Zapletal, David

doi:10.1016/j.phpro.2013.04.002

Cited by 7 publications

(11 citation statements)

References 30 publications

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“…[1,16,17] Therea re also other models can be used, such as the multimode Brownian oscillator model. [1,16,17] Therea re also other models can be used, such as the multimode Brownian oscillator model.…”

Section: Resultsmentioning

confidence: 99%

“…Various models for SDF have been used, [11,[15][16][17] in this work we used [Eq. Various models for SDF have been used, [11,[15][16][17] in this work we used [Eq.…”

Section: Resultsmentioning

confidence: 99%

“…LHs of purple bacteria, namely peripheral( LH2) and core (LH1) lightharvesting complex, are relatively simple compared to those of higher plants and thus have been extensively studied with regard to excitation energy dynamics ranging from wavelike motion of coherently delocalized excitons to self-trapped excitations localized on one pigment site. [13][14][15][16][17] LH1 of Thermochromatium (Tch.) [11,12] So these BChl a aggregates can be theoreticallyd escribed with the Frenkel excitonm odel,w ith static (inhomogeneity in local site energy) and dynamic (interaction with the phononb ath) disorders induced by slow and fast nuclear motions taken into account.…”

Section: Introductionmentioning

confidence: 99%

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Metal Cations Induced αβ‐BChl a Heterogeneity in LH1 as Revealed by Temperature‐Dependent Fluorescence Splitting

Llansola-Portolés

et al. 2017

ChemPhysChem

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Two spectral forms of the core light-harvesting complex (LH1) of the purple bacterium Thermochromatium (Tch.) tepidum, the native Ca -binding and the Ba -substituted one, exhibit different fluorescence (FL) emission spectra at low temperature (T). While Ca-LH1 exhibits one emission band, an unusual splitting of the fluorescence is observed for Ba-LH1. These two sub-bands display the same spectral-width dependence according to T, but their intensity evolves differently with T. Based on the crystal structures, we propose that the FL splitting originates from a large αβ-BChl a transition energy heterogeneity, ≈600 cm , which is much larger compared with other LH1 and LH2 complexes (80-200 cm ). This large heterogeneity is induced by the inhomogeneous Coulomb (and possibly hydrogen-bonding) interactions exerted by Ba . The energy levels of the two LH1s were compared using exciton calculations in combination with Redfield theory. To simulate the FL splitting, an electronic transition containing two resonant bands was considered. This work shows how metal cations incorporated into the polypeptide modulate the electronic properties of BChl a aggregates.

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Section: Resultsmentioning

confidence: 99%

“…Various models for SDF have been used, [11,[15][16][17] in this work we used [Eq. Various models for SDF have been used, [11,[15][16][17] in this work we used [Eq.…”

Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Metal Cations Induced αβ‐BChl a Heterogeneity in LH1 as Revealed by Temperature‐Dependent Fluorescence Splitting

Llansola-Portolés

et al. 2017

ChemPhysChem

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“…vinosum . For LH4, its absorption spectrum and geometric structure have been reported , while there was only computational simulation in its energy efficiency . It lacks the experimental evidence of fluorescence spectra and energy transfer activity of LH4.…”

Section: Discussionmentioning

confidence: 99%

“…In order to clarify the difference in fluorescence spectra of LH2 and LH4, Horák et al . simulated the steady‐state fluorescence spectra of B850 ring molecules of LH2 and LH4, showing that LH2 had a lower energy band, while LH4 had a higher energy band. Compared to LH2, LH4 had a blueshifted, broader, room temperature NIR fluorescence spectra, higher FQE .…”

Section: Discussionmentioning

confidence: 99%

The Growth‐promoting Mechanism of Unusual Spectroscopic Form of LH2 (LH4) from Rhodopseudomonas palustris CGA009 in Low Light

Zhao

Yang

et al. 2019

Photochem & Photobiology

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The experimental evidence for the growth‐promoting mechanism and the efficiency of energy transfer (EET) of LH4 under low light are still not available. To elucidate the light adaption mechanism of LH4, we deleted the genes pucBAd involved in the synthesis of the α/β polypeptides of LH4 in Rhodopseudomonas palustris CGA009. Compared to wild strain, the growth rate of pucBAd mutant significantly decreased under low light, while there were no significant changes in the growth rate, the contents and compositions of photopigments, absorption spectra of cell lysates under high light. Moreover, the fluorescence quantum efficiency (FQE) was used to further compare the EET between LH2 and LH4. The FQE in LH4 increased up to 1.5‐fold than did in LH2. Collectively, this study showed that LH4 could provide more and high energetic state photons for promoting bacterial phototrophic growth in response to low‐light environment.

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Computer Simulation of Emission and Absorption Spectra for LH2 Ring

Heřman

Zapletal

2015

Lecture Notes in Electrical Engineering

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Modeling of Emission Spectra for Molecular Rings - LH2 And LH4 Complexes

Cited by 7 publications

References 30 publications

Metal Cations Induced αβ‐BChl a Heterogeneity in LH1 as Revealed by Temperature‐Dependent Fluorescence Splitting

Metal Cations Induced αβ‐BChl a Heterogeneity in LH1 as Revealed by Temperature‐Dependent Fluorescence Splitting

The Growth‐promoting Mechanism of Unusual Spectroscopic Form of LH2 (LH4) from Rhodopseudomonas palustris CGA009 in Low Light

Computer Simulation of Emission and Absorption Spectra for LH2 Ring

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