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Photosynthetic Reaction Center Complex Proteins (4):
Recent article
Photosynthetic Reaction Center Complex Proteins
Abstract
All cells must traffic proteins into and across their membranes. In bacteria, several pathways have evolved to enable protein transfer across the inner membrane, the periplasm, and the outer membrane. The major route of protein translocation in and across the cytoplasmic membrane is the general secr...
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PMID: 20204450
PDF is available here.
PDF is available here.
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Abstract
We show that both proteins are present in the moss Physcomitrella patens. By generating KO mutants lacking PSBS and/or LHCSR, we also demonstrate that both gene products are active in NPQ. Plants lacking both proteins are more susceptible to high light stress than WT, implying that they are active i...
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PMID: 20505121
PDF is available here.
PDF is available here.
Abstract
The crtB gene of Synechocystis sp. PCC 6803, encoding phytoene synthase, was inactivated in the Delta crtH mutant to generate a carotenoidless Delta crtH/B double mutant. Delta crtH mutant cells were used because they had better transformability than wild-type cells, most probably due to their adapt...
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PMID: 20231245
PDF is available here.
PDF is available here.
Abstract
The Chlamydomonas reinhardtii genomic DNA database contains a predicted open reading frame (ORF-P) without an apparent stop-codon and unknown coding sequence, located in close proximity and immediately upstream of the TLA1 gene (GenBank Accession No. AF534570). The latter was implicated in the regul...
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PMID: 20012986
PDF is available here.
PDF is available here.
Biochemistry (New York) (75)2 2010
Abstract
We demonstrated earlier that as a result of the I(L177)H mutation in the photosynthetic reaction center (RC) of the bacterium Rhodobacter sphaeroides, one of the bacteriochlorophylls (BChl) binds with the L-subunit, simultaneously raising coordination stability of the central magnesium atom of the b...
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PMID: 20367608
PDF is available here.
PDF is available here.
Photosynthesis Research (103)1 2010
Abstract
We are proud to have been associated with him in making those first measurements. Here, we present our association and publications with him, and provide some of the history behind this research....
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PMID: 19924560
PDF is available here.
PDF is available here.
Abstract
The phylogenetic relationship of purple sulfur bacteria (PSB), of the order Chromatiales (class Gammaproteobacteria), was analyzed based on photosynthetic gene sequences of the pufL and pufM genes, and the results compared to phylogenetic trees and groupings of the 16S rRNA gene. Primers for pufL an...
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PMID: 19784924
PDF is available here.
PDF is available here.
Abstract
The light-harvesting pigment-protein complex LHCII is a main antenna complex of the photosynthetic apparatus of plants, responsible for collecting light energy and also for photoprotection against overexcitation-induced damage. Realization of both functions depends on molecular organization of the c...
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PMID: 19382785
PDF is available here.
PDF is available here.
Journal of Physical Chemistry A: Molecules, Spectroscopy, Kinetics, Environment and General Theory (113)30 2009
Abstract
A self-assembled supramolecular triad, a model to mimic the photochemical events of photosynthetic antenna-reaction center, viz., sequential energy and electron transfer, has been newly constructed and studied. Boron dipyrrin, zinc porphyrin, and fullerene respectively constitute the energy donor, e...
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PMID: 19580310
PDF is available here.
PDF is available here.
Abstract
We study a model of a light-induced proton pump in artificial reaction centers. The model contains a molecular triad with four electron states (i.e., one donor state, two photosensitive group states, and one acceptor state) as well as a molecular shuttle having one electron and one proton-binding si...
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PMID: 19624234
PDF is available here.
PDF is available here.
Photosynthesis Research (101)1 2009
Abstract
Kinetics of electron transfer, following variation of actinic light intensity, for photosynthetic reaction centers (RCs) of purple bacteria (isolated and membrane-bound) were analyzed by measuring absorbance changes in the primary photoelectron donor absorption band at 865 nm. The bleaching of the p...
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PMID: 19578969
PDF is available here.
PDF is available here.
The Journal of Chemical Physics (130)20 2009
Abstract
Recent experimental observations of time-resolved multidimensional signals in the light-harvesting antennae Fenna-Mathews-Olson [G. S. Engel et al., Nature (London) 446, 782 (2007)] show large oscillations of exciton populations coupled to the long-lived coherences. These effects may not be reproduc...
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PMID: 19485462
PDF is available here.
PDF is available here.
Photosynthesis Research (100)2 2009
Abstract
Reconstitution of membrane proteins in phospholipid vesicles allows the investigation of such macromolecules in a biomimetic simplified environment. The often employed micelle-to-vesicle-transition method for proteoliposome preparation is a fast and reproducible technique. In this, communication is...
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PMID: 19387862
PDF is available here.
PDF is available here.
Photosynthesis Research (100)2 2009
Abstract
In aerobic anoxygenic phototrophs, oxygen is required for both the formation of the photosynthetic apparatus and an efficient cyclic electron transfer. Mutants of Bradyrhizobium sp. ORS278 affected in photosystem synthesis were selected by a bacteriochlorophyll fluorescence-based screening. Out of t...
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PMID: 19452262
PDF is available here.
PDF is available here.
Biochemical Society transactions (37)Pt 2 2009
Abstract
Photoreaction centres are Nature's solar batteries. These nanometre-scale power producers are responsible for transducing the energy of sunlight into a form that can be used by biological systems, thereby powering most of the biological activity on the planet. Although to the layman the word 'photos...
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PMID: 19290870
PDF is available here.
PDF is available here.
Abstract
Our molecular data confirmed that the currently available strains of Rhodopseudomonas (Rps.) palustris are genetically quite heterogeneous within the genus. For example, Rps. palustris strains DSM 123(T) and ATCC 17001(T) are different from each other at the species level despite their status as the...
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PMID: 20118611
PDF is available here.
PDF is available here.
BMC Plant Biology (9)1 2009
Abstract
In studies presented here, under constant laboratory conditions the metabolite profiles of leaves of wild-type Arabidopsis thaliana and plants lacking or overexpressing PsbS were very similar, but under natural conditions their differences in levels of PsbS expression were associated with major chan...
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PMID: 19171025
PDF is available here.
PDF is available here.
Abstract
The cornerstones of the first fundamental concept of photosynthetic machinery, i.e. the concept of photosynthetic units, are reconsidered and a new logically and experimentally well sustained interpretation of the crucial observations of this hypothesis is presented. The results obtained lead to the...
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PMID: 19791495
PDF is available here.
PDF is available here.
Abstract
pi-pi assisted: Photoinduced electron transfer from cofacial porphyrin dimers to electron acceptors is prominently accelerated, whereas the back electron transfer is decelerated, relative to the corresponding porphyrin monomer (see figure).The radical cation of zinc tetrapentylporphyrin is dimerized...
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PMID: 19197918
PDF is available here.
PDF is available here.
Photosynthesis Research (101)2-3 2009
Abstract
We examine how the characteristics of the TL emission depend on the redox potentials of the cofactors, showing good agreement between theory and experimental studies on Photosystem (PS) II mutants. We also analyze the effect on (thermo-) luminescence of the connectivity of the light-harvesting pigme...
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PMID: 19533412
PDF is available here.
PDF is available here.
Photosynthesis Research (101)2-3 2009
Abstract
We can use reaction-induced FTIR difference spectroscopy to select vibrations corresponding to single chemical groups involved in a specific reaction. Various strategies are used to identify the IR signatures of each residue of interest in the resulting reaction-induced FTIR difference spectra. (Spe...
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PMID: 19513810
PDF is available here.
PDF is available here.
Biochemistry (New York) (74)1 2009
Abstract
Methods of photoinduced Fourier transform infrared (FTIR) difference spectroscopy and circular dichroism were employed for studying features of pigment-protein interactions caused by replacement of isoleucine L177 by histidine in the reaction center (RC) of the site-directed mutant I(L177)H of Rhodo...
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PMID: 19232051
PDF is available here.
PDF is available here.
Abstract
The standard theory of the electron transfer between donor and acceptor molecules was used to describe oscillations in the reduction kinetics of the intermediate electron acceptor BA and the primary electron acceptor HA. The kinetics of the reduction of BA and HA were simulated on the basis of the m...
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PMID: 20067182
PDF is available here.
PDF is available here.
Journal of Physical Chemistry B (112)45 2008
Abstract
The excitation wavelength dependence of the initial electron transfer rate in both wild type and mutant reaction centers from Rhodobacter sphaeroides has been studied between 840 and 920 nm as a function of temperature (10-295 K). The dynamics of primary charge separation show no resolvable excitati...
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PMID: 18939793
PDF is available here.
PDF is available here.
Biochemistry (Washington) (47)44 2008
Abstract
Femtosecond transient absorbance spectroscopy was applied to the study of primary electron transfer in single reaction center crystals from Rhodobacter sphaeroides. Polarized transient absorption spectra of individual crystals are shown to correlate with polarized ground-state absorption spectra and...
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PMID: 18847224
PDF is available here.
PDF is available here.
Journal of Biological Chemistry (283)43 2008
Abstract
We have documented that the S(2) and S(3) states in psbo1 thylakoids decay very slowly. The total flash oxygen yield of the psbo1 mutant was also significantly reduced, as was its stability. Incubation of psbo1 thylakoids at high NaCl concentrations did not increase the rate of S(2) and S(3) state d...
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PMID: 18667416
PDF is available here.
PDF is available here.
Abstract
We have attempted comparative studies on the excitation dynamics of bacteriochlorophyll (BChl) and carotenoid (Car) between the intact core complex and the EDTA-treated one with the Q(y) absorption at 889 nm. For both spectral forms, the overall Car-to-BChl excitation energy transfer efficiency is d...
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PMID: 18502793
PDF is available here.
PDF is available here.
Biochemical Society Transactions (36)Pt 5 2008
Abstract
Natural photosynthesis requires diffusion-based processes either for the functional communication of protein complexes or for the adaptation, maintenance and biogenesis of the photosynthetic apparatus. A conceptual problem with lateral diffusion in photosynthetic membranes arises from the fact that...
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PMID: 18793171
PDF is available here.
PDF is available here.
Biochimica et Biophysica Acta (1777)10 2008
Abstract
We review the data obtained by light-induced FTIR difference spectroscopy on the first electron transfer to the secondary quinone Q(B) in native RCs and a series of mutant RCs. We first examine the approach of isotope-edited FTIR spectroscopy to investigate the binding site of Q(B). This method prov...
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PMID: 18671937
PDF is available here.
PDF is available here.
Journal of Physical Chemistry B (112)38 2008
Abstract
We have carried out geometry optimization of water-A and its nearest atoms in the protein pocket, using density functional theory (DFT). There are strong hydrogen bonds to the axial imidazol group of the B part of the special pair (P=PAPB) and to the keto carbonyl group of ring V of the accessory ch...
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PMID: 18761433
PDF is available here.
PDF is available here.
Science of the Total Environment (403)1-3 2008
Abstract
Pesticide contamination in aquatic ecosystem including paddy fields is a serious global environmental concern. Cyanobacteria are also affected by pesticides as non- target organism. For better exploitation of cyanobacteria as biofertiliser, it is indispensable to select tolerant strains along with u...
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PMID: 18584851
PDF is available here.
PDF is available here.
Journal of Physical Chemistry B (112)37 2008
Abstract
Fucoxanthin chlorophyll-a/c 2 protein (FCP), the membrane-intrinsic light harvesting complex from the diatom Cyclotella meneghiniana, is characterized by Stark spectroscopy to obtain a quantitative measure of the excited-state dipolar properties of the constituent pigments. The electro-optical prope...
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PMID: 18722413
PDF is available here.
PDF is available here.
Journal of Biological Chemistry (283)38 2008
Abstract
We investigated the organization of photosystem II (PSII) in agranal bundle sheath thylakoids from a C(4) plant maize. Using blue native/SDS-PAGE and single particle analysis, we show for the first time that PSII in the bundle sheath (BS) chloroplasts exists in a dimeric form and forms light-harvest...
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PMID: 18632664
PDF is available here.
PDF is available here.
Journal of Biological Chemistry (283)38 2008
Abstract
We present the functional analysis of Gun4 from the cyanobacterium Synechocystis sp. PCC 6803. Affinity co-purification of the FLAG-tagged Gun4 with the ChlH subunit of the magnesium chelatase confirmed the association of Gun4 with the enzyme in cyanobacteria. Inactivation of the gun4 gene abolished...
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PMID: 18625715
PDF is available here.
PDF is available here.
Abstract
We report the analysis of the structure and expression of the 14 kb cluster (crtEF-bchCXYZ-pufBALMC-crtADC) in the photosynthetic betaproteobacterium Rubrivivax gelatinosus, with the purpose of understanding the reasons and the biological constraints that might have led to the clustering of photosyn...
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PMID: 18479441
PDF is available here.
PDF is available here.
Plant Biology (10 Suppl 1) 2008
Abstract
Leaf proteins, and in particular the photosynthetic proteins of plastids, are extensively degraded during senescence. Although this involves massive amounts of protein, the mechanisms responsible for chloroplast protein degradation are largely unknown. Degradation within the plastid itself is suppor...
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PMID: 18721308
PDF is available here.
PDF is available here.
Plant Physiology (148)1 2008
Abstract
Monogalactosyldiacylglycerol (MGDG) is the major lipid constituent of chloroplast membranes and has been proposed to act directly in several important plastidic processes, particularly during photosynthesis. In this study, the effect of MGDG deficiency, as observed in the monogalactosyldiacylglycero...
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PMID: 18641085
PDF is available here.
PDF is available here.
Abstract
We investigated the conformation change of RCs using heterodyne detection of the laser-induced transient grating method. An about 25 microseconds dynamics was observed, which coincides with the one described by the conformational gating model and possibly related to the nonadiabatic intrinsic Q(A)Q(...
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PMID: 18330555
PDF is available here.
PDF is available here.
Abstract
The steady-state operation of photosynthetic reaction center from Rhodobacter sphaeroides was investigated by measuring the rate of cytochrome photo-oxidation under intensive continuous illumination (808 nm, 5 W cm(-2)). The native quinone UQ10 in Q(B) binding site of the reaction center was substit...
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PMID: 18368404
PDF is available here.
PDF is available here.
Abstract
We considered that Q(A) might be reduced by disproportionation with QH2 through the Q(B) site, so the titration actually reflects the quinone pool, giving the -60 mV/pH unit dependence expected for the Q/QH2 couple. However, the parameters necessary to achieve a strong pH-dependence are not in good...
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PMID: 18351330
PDF is available here.
PDF is available here.
Abstract
Induction of the bacteriochlorophyll fluorescence under rectangular shape of intense laser diode illumination (1 W cm(-2), 808 nm) was measured over wide time range from 10 microseconds to 4 s in whole cells, chromatophore and isolated reaction center protein of wild type and carotenoid-less mutant...
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PMID: 18351331
PDF is available here.
PDF is available here.
Photosynthesis Research (97)3 2008
Abstract
We have performed a comparative study of key photosynthetic proteins in order to seek the answer to the question; did the evolutionary substitution of oxygen- and nitrogen-containing residues in the photosynthetic proteins correspond to nutrient constraints and metabolic optimization? The D1 peptide...
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PMID: 18766462
PDF is available here.
PDF is available here.
Photosynthesis Research (97)3 2008
Abstract
I and reaction center complexes, which are functional under aerobic conditions....
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PMID: 18679821
PDF is available here.
PDF is available here.
Biochemistry (Washington) (47)35 2008
Abstract
These results demonstrate that substantial radiation damage is likely to have occurred during X-ray diffraction data collection used for photosynthetic RC structure determination. Thus, both radiation-induced loss of photochemical activity in RC crystals and reduction of the quinones are important f...
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PMID: 18690706
PDF is available here.
PDF is available here.
Biochimica et Biophysica Acta (1777)9 2008
Abstract
We studied the regulation mechanism of electron donations from menaquinol:cytochrome c oxidoreductase and cytochrome c-554 to the type I homodimeric photosynthetic reaction center complex of the green sulfur bacterium Chlorobium tepidum. We measured flash-induced absorption changes of multiple cytoc...
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PMID: 18534186
PDF is available here.
PDF is available here.
Abstract
We show that the efficiency of these devices can be improved by the utilization of a new type of nano-organized material having photosynthetic reaction center proteins encapsulated inside carbon nanotube arrayed electrodes. In this work, a generically engineered bacterial photosynthetic reaction cen...
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PMID: 18616302
PDF is available here.
PDF is available here.
Journal of Physical Chemistry B (112)33 2008
Abstract
We report the results of molecular dynamics (MD) simulations and formal modeling of the free-energy surfaces and reaction rates of primary charge separation in the reaction center of Rhodobacter sphaeroides. Two simulation protocols were used to produce MD trajectories. Standard force-field potentia...
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PMID: 18636767
PDF is available here.
PDF is available here.
Journal of Physical Chemistry B (112)32 2008
Abstract
We propose that persistent holes originate from regular NPHB accompanied by the redistribution of oscillator strength due to excitonic interactions, rather than photoconversion involving Chl-protein hydrogen bonding, as suggested before ( Hughes J. L. et al. Biochemistry 2006, 45, 12345 ). In the ac...
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PMID: 18642949
PDF is available here.
PDF is available here.
Journal of Physical Chemistry B (112)32 2008
Abstract
We present the results of a series of Monte Carlo simulations using the 3.0-A structure of the PSII core complex from cyanobacteria (Loll, B., et al. Nature 2005, 303, 1040.) to model absorption, emission, persistent, and transient hole burned (HB) spectra. At the current structural resolution, we f...
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PMID: 18642950
PDF is available here.
PDF is available here.
Abstract
We studied the recombination kinetics of the primary, light-induced charge separated state (P(+)Q(A)(-)) and the thermal stability of the photosynthetic reaction center (RC) of Rhodobacter sphaeroides in trehalose-water and in sucrose-water matrixes of decreasing water content. Our data show that, i...
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PMID: 18611016
PDF is available here.
PDF is available here.
Current Microbiology (57)2 2008
Abstract
We report here the assembly of an [Fe(4)S(4)] cluster in HiPIP from A. ferrooxidans ATCC 23270 in vitro in the presence of Fe(2+) and sulfide. The spectra and matrix-assisted laser desorption ionization-time of flight mass spectrometry results of holoHiPIP confirmed that the iron-sulfur cluster was...
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PMID: 18574631
PDF is available here.
PDF is available here.
Abstract
Photophysical properties of tetramethyl-1,4-benzoquinone (TMBQ) and 2,6-dimethoxy-1,4-benzoquinone (DMOBQ) in solution and their interactions with the photosynthetic reaction centre (RC) isolated from the photosynthetic bacterium Rhodobacter sphaeroides have been investigated in this work. For these...
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PMID: 18688505
PDF is available here.
PDF is available here.
Plant Journal (55)3 2008
Abstract
We report that a MYB transcription factor Blue Insensitive Trait 1 (BIT1), plays an important role in controlling blue light responses. Hypocotyl growth responses indicate that BIT1 functions as a positive element in blue light signaling, since BIT1 antisense and knock-out lines show a reduced light...
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PMID: 18397371
PDF is available here.
PDF is available here.
Plant Physiology (147)4 2008
Abstract
We analyzed the effects of light regulation on four selected histone modifications (H3K4me3, H3K9ac, H3K9me2, and H3K27me3) and the relationship of these histone modifications with the expression of representative light-regulated genes. We observed that the histone modifications examined and gene tr...
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PMID: 18550682
PDF is available here.
PDF is available here.
Photosynthesis Research (97)2 2008
Abstract
We discuss some of the evolutionary pathways for the appearance and differentiation of cyanobacteria....
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PMID: 18568415
PDF is available here.
PDF is available here.
Biophysical Journal (95)3 2008
Abstract
We conclude that the drop in free energy associated with the relaxation of P(+)H(L)(-) is due to an increased localization of the electron hole on the P(L) half of the dimer and a further consequence is a reduction in the electrical field causing the Stark shift of one or more amide C=O oscillators....
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PMID: 18424493
PDF is available here.
PDF is available here.
Abstract
The competition between the P(+)Q(A)(-) --> PQ(A) charge recombination (P, bacteriochlorophyll pair acting as primary photochemical electron donor) and the electron transfer to the secondary quinone acceptor Q(A)(-)Q(B) --> Q(A)Q(B)(-) (Q(A) and Q(B), primary and secondary electron accepting quinone...
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PMID: 18588291
PDF is available here.
PDF is available here.
Abstract
We report on the effects of water activity and surrounding viscosity on electron transfer reactions taking place within a membrane protein: the reaction center (RC) from the photosynthetic bacterium Rhodobacter sphaeroides. We measured the kinetics of charge recombination between the primary photoxi...
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PMID: 18576650
PDF is available here.
PDF is available here.
Journal of Molecular Biology (380)5 2008
Abstract
We report the discovery of a novel cyanobacteriochrome, the green/red photoreceptor AnPixJ (All1069), isolated from the heterocyst-forming cyanobacterium Anabaena (Nostoc) sp. PCC 7120. Cyanobacteriochromes are a recently emerging tetrapyrrole-based photoreceptor superfamily that are distantly relat...
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PMID: 18571200
PDF is available here.
PDF is available here.
Abstract
The diversity of aerobic anoxygenic phototrophic (AAP) bacteria has been examined in marine habitats, but the types of AAP bacteria in estuarine waters and distribution of ecotypes in any environment are not well known. The goal of this study was to determine the diversity of AAP bacteria in the Del...
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PMID: 18469118
PDF is available here.
PDF is available here.