Biochimica et Biophysica Acta (BBA) Bioenergetics 
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This is an RSS file. You can use it to subscribe to this data in your favourite RSS reader or to display this data on your own website or blog.Photochemical characterization of flavobacterial rhodopsin: The importance of the helix E region for heat stability
Publication date: Available online 6 November 2019Source: Biochimica et Biophysica Acta (BBA) - BioenergeticsAuthor(s): SongI Han, Se-Hwan Kim, Jang-Chon Cho, Jaeho Song, Gwen Bleckner, Kwang-Hwan JungAbstractAlthough many microbial rhodopsins have been discovered many of organisms in a variety of habitats, little is known about the property and diversity of rhodopsin in flavobacteria. Recent studies discovered that many proteorhodopsin (PR)-like proteins exist in genomes of flavobacteria. Following the isolation of a flavobacterial rhodopsins (FR) from the flavobacteria IMCC1997 from the East Sea of Korea, we characterize...
Source: Biochimica et Biophysica Acta (BBA) Bioenergetics - November 7, 2019 Category: Biochemistry Source Type: research
Role of the two PsaE isoforms on O2 reduction at photosystem I in Arabidopsis thaliana
Publication date: Available online 6 November 2019Source: Biochimica et Biophysica Acta (BBA) - BioenergeticsAuthor(s): Anja Krieger-Liszkay, Ginga Shimakawa, Pierre SétifAbstractLeaves of Arabidopsis thaliana plants grown in short days (8 h light) generate more reactive oxygen species in the light than leaves of plants grown in long days (16 h light). The importance of the two PsaE isoforms of photosystem I, PsaE1 and PsaE2, for O2 reduction was studied in plants grown under these different growth regimes. In short day conditions a mutant affected in the amount of PsaE1 (psae1-1) reduced more efficiently O2 than a mu...
Source: Biochimica et Biophysica Acta (BBA) Bioenergetics - November 7, 2019 Category: Biochemistry Source Type: research
In the respiratory chain of Escherichia coli cytochromes bd-I and bd-II are more sensitive to carbon monoxide inhibition than cytochrome bo3
Publication date: Available online 4 November 2019Source: Biochimica et Biophysica Acta (BBA) - BioenergeticsAuthor(s): Elena Forte, Vitaliy B. Borisov, Sergey A. Siletsky, Maria Petrosino, Alessandro GiuffrèAbstractBacteria can not only encounter carbon monoxide (CO) in their habitats but also produce the gas endogenously. Bacterial respiratory oxidases, thus, represent possible targets for CO. Accordingly, host macrophages were proposed to produce CO and release it into the surrounding microenvironment to sense viable bacteria through a mechanism that in Escherichia (E.) coli was suggested to involve the targeting of a ...
Source: Biochimica et Biophysica Acta (BBA) Bioenergetics - November 5, 2019 Category: Biochemistry Source Type: research
Identification of assembly precursors to photosystems emitting fluorescence at 683 nm and 687 nm by cryogenic fluorescence microspectroscopy
Publication date: Available online 31 October 2019Source: Biochimica et Biophysica Acta (BBA) - BioenergeticsAuthor(s): Tomofumi Chiba, Yutaka ShibataAbstractPhotosystem I (PSI) and photosystem II (PSII) play key roles in photoinduced electron-transfer reaction in oxygenic photosynthesis. Assemblies of these PSs can be initiated by illumination of the etiolated seedlings (greening). The study aimed to identify specific fluorescence spectral components relevant to PSI and PSII assembly intermediates emerging in greening seedlings of Zea mays, a typical C4 plant. The different PSII contents between the bundle sheath (BS) and...
Source: Biochimica et Biophysica Acta (BBA) Bioenergetics - November 1, 2019 Category: Biochemistry Source Type: research
Fourier transform infrared and mass spectrometry analyses of a site-directed mutant of D1-Asp170 as a ligand to the water-oxidizing Mn4CaO5 cluster in photosystem II
In this study, we constructed a D1-D170H mutant, in which the Asp ligand bridging Mn and Ca ions was replaced with His, in the cyanobacterium Synechocystis sp. PCC 6803, and analyzed isolated PSII core complexes using Fourier transform infrared (FTIR) difference spectroscopy and mass spectrometry (MS). The S2-minus-S1 FTIR difference spectrum of the PSII complexes of the D1-D170H mutant showed features virtually identical to those of the wild-type PSII. MS analysis further showed that ~70% of D1 proteins from the PSII complexes of D1-D170H possessed the wild-type amino acid sequence, although only the mutated sequence was ...
Source: Biochimica et Biophysica Acta (BBA) Bioenergetics - November 1, 2019 Category: Biochemistry Source Type: research
Editorial Board
Publication date: 1 November 2019Source: Biochimica et Biophysica Acta (BBA) - Bioenergetics, Volume 1860, Issue 11Author(s): (Source: Biochimica et Biophysica Acta (BBA) Bioenergetics)
Source: Biochimica et Biophysica Acta (BBA) Bioenergetics - November 1, 2019 Category: Biochemistry Source Type: research
The BF4 and p71 antenna mutants from Chlamydomonas reinhardtii
Publication date: Available online 28 October 2019Source: Biochimica et Biophysica Acta (BBA) - BioenergeticsAuthor(s): Sandrine Bujaldon, Natsumi Kodama, Mithun Kumar Rathod, Nicolas Tourasse, Shin-Ichiro Ozawa, Julien Sellés, Olivier Vallon, Yuichiro Takahashi, Francis-André WollmanAbstractTwo pale green mutants of the green alga Chlamydomonas reinhardtii, which have been used over the years in many photosynthesis studies, the BF4 and p71 mutants, were characterized and their mutated gene identified in the nuclear genome. The BF4 mutant is defective in the insertase Alb3.1 whereas p71 is defective in cpSRP43. The two m...
Source: Biochimica et Biophysica Acta (BBA) Bioenergetics - October 29, 2019 Category: Biochemistry Source Type: research
Remodeling of excitation energy transfer in extremophilic red algal PSI-LHCI complex during light adaptation
In this study we applied time-resolved fluorescence spectroscopy to characterize the kinetics of energy transfer processes in three types of PSI-LHCI supercomplexes isolated from the low (LL), medium (ML) and extreme high light (EHL) conditions. We show that the average rate of fluorescence decay is not correlated with the size of LHCI antenna and is twice faster in complexes isolated from ML-grown cells (~25–30 ps) than from both LL- and EHL-exposed cells (~50–55 ps). The difference is mainly due to a contribution of a long ~100-ps decay component detected only for the latter two PSI samples. We propose that the l...
Source: Biochimica et Biophysica Acta (BBA) Bioenergetics - October 26, 2019 Category: Biochemistry Source Type: research
Does the water-oxidizing Mn4CaO5 cluster regulate the redox potential of the primary quinone electron acceptor QA in photosystem II? A study by Fourier transform infrared spectroelectrochemistry
In this study, we reinvestigated the effect of depletion of the Mn4CaO5 cluster on Em(QA−/QA) using Fourier transform infrared (FTIR) spectroelectrochemistry, which can directly monitor the redox state of QA at an intended potential. Light-induced FTIR difference measurements at a series of electrode potentials for intact and Mn-depleted PSII preparations from spinach and Thermosynechococcus elongatus showed that depletion of the Mn4CaO5 cluster hardly affected the Em(QA−/QA) values. In contrast, fluorescence spectroelectrochemical measurement using the same PSII sample, electrochemical cell, and redox mediators reprod...
Source: Biochimica et Biophysica Acta (BBA) Bioenergetics - October 26, 2019 Category: Biochemistry Source Type: research
An alternative plant-like cyanobacterial ferredoxin with unprecedented structural and functional properties: Ferredoxin with low Em discriminating against FNR
We report the structural and functional properties of a novel minor type ferredoxin, Fd2 of T. elongatus, homologous to Fed4 from Synechocystis sp. PCC 6803. Remarkably, the midpoint potential of Fd2, Em = −440 mV, is lower than that of Fd1, Em = −372 mV. However, while Fd2 can efficiently react with photosystem I or nitrite reductase, time-resolved spectroscopy shows that Fd2 has a very low capacity to reduce ferredoxin-NADP+ oxidoreductase (FNR). These unique Fd2 properties are discussed in relation with its structure, solved at 1.38 Å resolution. The Fd2 structure significantly differs from other know...
Source: Biochimica et Biophysica Acta (BBA) Bioenergetics - September 13, 2019 Category: Biochemistry Source Type: research
On the interface of light-harvesting antenna complexes and reaction centers in oxygenic photosynthesis
Publication date: Available online 10 September 2019Source: Biochimica et Biophysica Acta (BBA) - BioenergeticsAuthor(s): Haijun Liu, Robert E. BlankenshipAbstractPhotosynthetic pigment-protein complexes (PPCs) accomplish light-energy capture and photochemistry in natural photosynthesis. In this review, we examine three pigment protein complexes in oxygenic photosynthesis: light-harvesting antenna complexes and two reaction centers: Photosystem II (PSII), and Photosystem I (PSI). Recent technological developments promise unprecedented insights into how these multi–component protein complexes are assembled into higher ord...
Source: Biochimica et Biophysica Acta (BBA) Bioenergetics - September 11, 2019 Category: Biochemistry Source Type: research
Characterization and X-ray structure of the NADH-dependent coenzyme A disulfide reductase from Thermus thermophilus
Publication date: Available online 11 September 2019Source: Biochimica et Biophysica Acta (BBA) - BioenergeticsAuthor(s): Andrea M. Lencina, Juergen Koepke, Julia Preu, Conny Muenke, Robert B. Gennis, Hartmut Michel, Lici A. Schurig-BriccioAbstractThe crystal structure of the enzyme previously characterized as a type-2 NADH:menaquinone oxidoreductase (NDH-2) from Thermus thermophilus has been solved at a resolution of 2.9 Å and revealed that this protein is, in fact, a coenzyme A-disulfide reductase (CoADR). Coenzyme A (CoASH) replaces glutathione as the major low molecular weight thiol in Thermus thermophilus and is ma...
Source: Biochimica et Biophysica Acta (BBA) Bioenergetics - September 11, 2019 Category: Biochemistry Source Type: research
Regulation of photosynthetic cyclic electron flow pathways by adenylate status in higher plant chloroplasts
Publication date: Available online 11 September 2019Source: Biochimica et Biophysica Acta (BBA) - BioenergeticsAuthor(s): Nicholas Fisher, Terry M. Bricker, David M. KramerAbstractCylic electron flow (CEF) around Photosystem I in photosynthetic eukaryotes is likely to be necessary to augment ATP production, rapidly- and precisely balancing the plastid ATP/NADPH energy budget to meet the demands of downstream metabolism. Many regulatory aspects of this process are unclear. Here we demonstrate that the higher plant plastid NADH/Fd:plastoquinone reductase (NDH) and proposed PGR5/PGRL1 ferredoxin:plastoquinone reductase (FQR) ...
Source: Biochimica et Biophysica Acta (BBA) Bioenergetics - September 11, 2019 Category: Biochemistry Source Type: research
Tuning antenna function through hydrogen bonds to chlorophyll a
We describe a molecular mechanism tuning the functional properties of chlorophyll a (Chl-a) molecules in photosynthetic antenna proteins. Light-harvesting complexes from photosystem II in higher plants – specifically LHCII purified with α- or β-dodecyl-maltoside, along with CP29 – were probed by low-temperature absorption and resonance Raman spectroscopies. We show that hydrogen bonding to the conjugated keto carbonyl group of protein-bound Chl-a tunes the energy of its Soret and Qy absorption transitions, inducing red-shifts that are proportional to the strength of the hydrogen bond involved. Chls-a with non-H-bonde...
Source: Biochimica et Biophysica Acta (BBA) Bioenergetics - August 31, 2019 Category: Biochemistry Source Type: research
Photosynthetic regulation under fluctuating light in field-grown Cerasus cerasoides: A comparison of young and mature leaves
Publication date: Available online 29 August 2019Source: Biochimica et Biophysica Acta (BBA) - BioenergeticsAuthor(s): Ying-Jie Yang, Shi-Bao Zhang, Ji-Hua Wang, Wei HuangAbstractPhotosystem I (PSI) is a potential target of photoinhibition under fluctuating light. However, photosynthetic regulation under fluctuating light in field-grown plants is little known. Furthermore, it is unclear how young leaves protect PSI against fluctuating light under natural field conditions. In the present study, we examined chlorophyll fluorescence, P700 redox state and the electrochromic shift signal in the young and mature leaves of field-...
Source: Biochimica et Biophysica Acta (BBA) Bioenergetics - August 30, 2019 Category: Biochemistry Source Type: research
