Abstract:
:The LH2 antenna complexes of purple bacteria occur, depending on light conditions, in various different spectroscopic forms, with a similar structure but different absorption spectra. The differences are related to point changes in the primary amino acid sequence, but the molecular-level relationship between these changes and the resulting spectrum is still not well understood. We undertook a systematic quantum chemical analysis of all the main factors that contribute to the exciton structure, looking at how the environment modulates site energies and couplings in the B800-850 and B800-820 spectroscopic forms of LH2. A multiscale approach combining quantum chemistry and an atomistic classical embedding has been used where mutual polarization effects between the two parts are taken into account. We find that the loss of hydrogen bonds following amino acid changes can only explain a part of the observed blue-shift in the B850 band. The coupling of excitonic states to charge-transfer states, which is different in the two forms, contributes with a similar amount to the overall blue-shift.
journal_name
Photosynth Resjournal_title
Photosynthesis researchauthors
Nottoli M,Jurinovich S,Cupellini L,Gardiner AT,Cogdell R,Mennucci Bdoi
10.1007/s11120-018-0492-1subject
Has Abstractpub_date
2018-08-01 00:00:00pages
215-226issue
2eissn
0166-8595issn
1573-5079pii
10.1007/s11120-018-0492-1journal_volume
137pub_type
杂志文章abstract::The relationship between the redox state of P700, the primary donor of PS I, monitored using absorbance changes at 830 nm and photochemical energy storage in PS I reaction centers assayed with the photoacoustic method (PA) was studied in isolated PS I submembrane particles aspirated onto nitrocellulose filters. Severa...
journal_title:Photosynthesis research
pub_type: 杂志文章
doi:10.1023/A:1021237026500
更新日期:2002-01-01 00:00:00
abstract::The linear, four-step oxidation of water to molecular oxygen by photosystem II requires cooperation between redox reactions driven by light and a set of redox reactions involving the S-states within the oxygen-evolving complex. The oxygenevolving complex is a highly ordered structure in which a number of polypeptides ...
journal_title:Photosynthesis research
pub_type: 杂志文章
doi:10.1007/BF00037001
更新日期:1985-01-01 00:00:00
abstract::This personal perspective records research experiences in chemistry and biology at four German universities, two before and two after World War II. The research themes came from cytophysiology of green unicellular algae, in particular their photosynthesis. The function of inorganic ions in photosynthesis and dark resp...
journal_title:Photosynthesis research
pub_type: 杂志文章
doi:10.1007/BF00034771
更新日期:1994-06-01 00:00:00
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journal_title:Photosynthesis research
pub_type: 杂志文章
doi:10.1023/A:1016099228450
更新日期:2002-01-01 00:00:00
abstract::Chlorosomes, the light-harvesting apparatus of green bacteria, are a unique antenna system, in which pigments are organized in aggregates rather than associated with proteins. Isolated chlorosomes from the green sulphur bacterium Chlorobium tepidum contain 10 surface-exposed proteins. Treatment of chlorosomes from Chl...
journal_title:Photosynthesis research
pub_type: 杂志文章
doi:10.1007/s11120-005-3757-4
更新日期:2005-11-01 00:00:00
abstract::Fluorescence and electron paramagnetic resonance measurements were used to study selenium influence on photosystem activity in rape seedlings affected by Cd stress. Water cultures containing Hoagland nutrients were supplemented with 400 microM of CdCl(2), 2 microM of Na(2)SeO(4) and a mixture of both CdCl(2) and Na(2)...
journal_title:Photosynthesis research
pub_type: 杂志文章
doi:10.1007/s11120-010-9551-y
更新日期:2010-07-01 00:00:00
abstract::The effects of protein phosphorylation and cation depletion on the electron transport rate and fluorescence emission characteristics of photosystem I at two stages of chloroplast development in light-grown wheat leaves are examined. The light-harvesting chlorophyll a/b protein complex associated with photosystem I (LH...
journal_title:Photosynthesis research
pub_type: 杂志文章
doi:10.1007/BF00030071
更新日期:1990-01-01 00:00:00
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journal_title:Photosynthesis research
pub_type: 杂志文章
doi:10.1007/BF00033716
更新日期:1991-05-01 00:00:00
abstract::Cells of the green alga Dunaliella tertiolecta grown in a light/dark cycle were exposed to high light for about 15 min. In light, energy-dependent quenching reduced fluorescence emission and decreased PS II efficiency. Within 3 minutes after darkening fluorescence quenching largely relaxed. However, PS II fluorescence...
journal_title:Photosynthesis research
pub_type: 杂志文章
doi:10.1007/BF00033120
更新日期:1996-12-01 00:00:00
abstract::Intra- and inter-specific variation in CO2 assimilation rate (A) in Triticum spp. is well documented for reproductive growth stages. Research was conducted to characterize early vegetative photosynthetic variation in a diverse set of cultivated hexaploid wheat (T. aestivum L.) germplasm and in wild tetraploid (T. dico...
journal_title:Photosynthesis research
pub_type: 杂志文章
doi:10.1007/BF00034120
更新日期:1989-05-01 00:00:00
abstract::Recycling of carbon by the photorespiratory pathway involves enzymatic steps in the chloroplast, mitochondria, and peroxisomes. Most of these reactions are essential for plants growing under ambient CO(2) concentrations. However, some disruptions of photorespiratory metabolism cause subtle phenotypes in plants grown i...
journal_title:Photosynthesis research
pub_type: 杂志文章
doi:10.1007/s11120-011-9651-3
更新日期:2011-09-01 00:00:00
abstract::In this communication, we report our progress on the development of low-frequency Fourier transform infrared (FTIR) spectroscopic techniques to study metal-substrate and metal-ligand vibrational modes in the Photosystem II/oxygen-evolving complex (PS II/OEC). This information will provide important structural and mech...
journal_title:Photosynthesis research
pub_type: 杂志文章
doi:10.1023/A:1010779327960
更新日期:2000-01-01 00:00:00
abstract::Green sulfur bacteria and heliobacteria are strictly anaerobic phototrophs that have homodimeric type 1 reaction center complexes. Within these complexes, highly reducing substances are produced through an initial charge separation followed by electron transfer reactions driven by light energy absorption. In order to ...
journal_title:Photosynthesis research
pub_type: 杂志文章,评审
doi:10.1007/s11120-009-9521-4
更新日期:2010-06-01 00:00:00
abstract::To understand design principles for assembling photosynthetic biohybrids that incorporate precisely-controlled sites for electron injection into redox enzyme cofactor arrays, we investigated the influence of chirality in assembly of the photosensitizer ruthenium(II)bis(2,2'-bipyridine)(4-bromomethyl-4'-methyl-2,2'-bip...
journal_title:Photosynthesis research
pub_type: 杂志文章
doi:10.1007/s11120-019-00697-8
更新日期:2020-02-01 00:00:00
abstract::The functional peculiarities and responses of the photosynthetic system in the flowering homoiochlorophyllous desiccation-tolerant (HDT) Haberlea rhodopensis and the non-desiccation-tolerant spinach were compared during desiccation and rehydration. Increasing rate of water loss clearly modifies the kinetic parameters ...
journal_title:Photosynthesis research
pub_type: 杂志文章
doi:10.1007/s11120-005-2440-0
更新日期:2005-08-01 00:00:00
abstract::The oxidation kinetics under far-red light (FRL) of photosystem I (PSI) high potential donors P700, plastocyanin (PC), and cytochrome f (Cyt f) were investigated in sunflower leaves with the help of a new high-sensitivity photometer at 810 nm. The slopes of the 810 nm signal were measured immediately before and after ...
journal_title:Photosynthesis research
pub_type: 杂志文章
doi:10.1007/s11120-007-9224-7
更新日期:2007-10-01 00:00:00
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journal_title:Photosynthesis research
pub_type: 杂志文章
doi:10.1007/BF00029747
更新日期:1986-01-01 00:00:00
abstract::P700 enriched fractions were isolated from two brown algae and one diatom using sucrose density centrifugation after digitinin solubilization. They had a Chl a/P700 ratio of about 250 to 375 according to the species, they were enriched in long-wavelength absorbing Chl a and exhibited a fluorescence emission maximum at...
journal_title:Photosynthesis research
pub_type: 杂志文章
doi:10.1007/BF00035009
更新日期:1990-02-01 00:00:00
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journal_title:Photosynthesis research
pub_type: 杂志文章
doi:10.1007/BF00028750
更新日期:1981-06-01 00:00:00
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journal_title:Photosynthesis research
pub_type: 杂志文章
doi:10.1007/BF00016551
更新日期:1993-03-01 00:00:00
abstract::The genome of the purple non-sulphur photosynthetic bacterium Rhodopseudomonas acidophila has been found to contain multiple copies of puc light-harvesting (LH2) peripheral antenna complex genes. Three wild-type isolates each exhibiting dissimilar peripheral antenna complex phenotypes in response to growth at reduced ...
journal_title:Photosynthesis research
pub_type: 杂志文章
doi:10.1007/BF00034783
更新日期:1996-09-01 00:00:00
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journal_title:Photosynthesis research
pub_type: 杂志文章
doi:10.1007/s11120-020-00754-7
更新日期:2020-06-01 00:00:00
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journal_title:Photosynthesis research
pub_type: 杂志文章
doi:10.1007/s11120-007-9147-3
更新日期:2007-06-01 00:00:00
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journal_title:Photosynthesis research
pub_type: 杂志文章
doi:10.1007/s11120-015-0128-7
更新日期:2015-06-01 00:00:00
abstract::The effects of root applications of kinetin, gibberellic acid (GA3) and indoleacetic acid (IAA) on photosynthesis was measured using an open infrared CO2 gas-exchange system. There was a 30-35% increase in the photosynthetic rates (mg CO2/dm(2)/hr) of attached leaves within 8 hr following root treatment with 0.47 μM k...
journal_title:Photosynthesis research
pub_type: 杂志文章
doi:10.1007/BF00030048
更新日期:1982-01-01 00:00:00
abstract::The unicellular green alga Chlamydomonas reinhardtii acclimates to low-CO2 (LC) conditions by actively transporting inorganic carbon (Ci) into the cell, resulting in an increase in photosynthetic efficiency. This mechanism is called the carbon-concentrating mechanism (CCM), and soluble protein LCIB is essential for th...
journal_title:Photosynthesis research
pub_type: 杂志文章
doi:10.1007/s11120-013-9963-6
更新日期:2014-09-01 00:00:00
abstract::DCMU (3-(3,4-dichlorophenyl)-1,1-dimethylurea) at concentrations higher than 10 μM suppresses the second time range delayed fluorescence (DF) of pea chloroplasts, due to inhibition of the oxidizing side of photosystem II (PS II). The inhibition of the reducing side of PS II resulting in the suppression of millisecond ...
journal_title:Photosynthesis research
pub_type: 杂志文章
doi:10.1007/BF00054986
更新日期:1988-01-01 00:00:00
abstract::A short list of the twentieth century's dominant figures in photosynthesis would unquestionably include Otto Warburg. One of his many discoveries, the 'bicarbonate effect' remains a lasting puzzle to his heirs in the field. Recent developments in this area of research have renewed interest and call for a re-examinatio...
journal_title:Photosynthesis research
pub_type: 杂志文章
doi:10.1023/A:1020447030191
更新日期:2002-01-01 00:00:00
abstract::We pay tribute to the life and work of Margareta Ryberg (1946-2012). She was an expert on the different forms of protochlorophyll(ide), their protein partners, and their transformations in angiosperms; on the structural aspects, and the nature of prolamellar bodies, as well as on the localization of light-dependent NA...
journal_title:Photosynthesis research
pub_type: 传,历史文章,杂志文章
doi:10.1007/s11120-012-9752-7
更新日期:2012-09-01 00:00:00
abstract::The electron transport rates of photosystems II and I, amounts of electron carriers, coupling factor activity and photosynthetic rates were investigated in thylakoids isolated from pea plants grown under a wide range of light intensities (16 h light-8 h dark). The electron transport rates of PS II and PS I, as partial...
journal_title:Photosynthesis research
pub_type: 杂志文章
doi:10.1007/BF00028525
更新日期:1984-06-01 00:00:00