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.What can we still learn from the electrochromic band-shifts in Photosystem II?
Publication date: Available online 12 February 2020Source: Biochimica et Biophysica Acta (BBA) - BioenergeticsAuthor(s): Alain Boussac, Julien Sellés, Miwa SugiuraAbstractElectrochromic band-shifts have been investigated in Photosystem II (PSII) from Thermosynechoccocus elongatus. Firstly, by using Mn-depleted PsbA1-PSII and PsbA3-PSII in which the QX absorption of PheD1 differs, a band-shift in the QX region of PheD2 centered at ~ 544 nm has been identified upon the oxidation, at pH 8.6, of TyrD. In contrast, a band-shift due to the formation of either QA•- or TyrZ• is observed in PsbA3-PSII at ~ 546 nm, as exp...
Source: Biochimica et Biophysica Acta (BBA) Bioenergetics - February 14, 2020 Category: Biochemistry Source Type: research
Engineering the photoactive orange carotenoid protein with redox-controllable structural dynamics and photoprotective function
Publication date: Available online 12 February 2020Source: Biochimica et Biophysica Acta (BBA) - BioenergeticsAuthor(s): Yury B. Slonimskiy, Eugene G. Maksimov, Evgeny P. Lukashev, Marcus Moldenhauer, Thomas Friedrich, Nikolai N. SluchankoAbstractPhotosynthesis requires various photoprotective mechanisms for survival of organisms in high light. In cyanobacteria exposed to high light, the Orange Carotenoid Protein (OCP) is reversibly photoswitched from the orange (OCPO) to the red (OCPR) form, the latter binds to the antenna (phycobilisomes, PBs) and quenches its overexcitation. OCPR accumulation implicates restructuring of...
Source: Biochimica et Biophysica Acta (BBA) Bioenergetics - February 14, 2020 Category: Biochemistry Source Type: research
Light harvesting in oxygenic photosynthesis
Publication date: Available online 28 January 2020Source: Biochimica et Biophysica Acta (BBA) - BioenergeticsAuthor(s): Roberta Croce (Source: Biochimica et Biophysica Acta (BBA) Bioenergetics)
Source: Biochimica et Biophysica Acta (BBA) Bioenergetics - January 29, 2020 Category: Biochemistry Source Type: research
Design principles of solar light harvesting in plants: Functional architecture of the monomeric antenna CP29
Publication date: Available online 24 January 2020Source: Biochimica et Biophysica Acta (BBA) - BioenergeticsAuthor(s): Vincenzo Mascoli, Vladimir Novoderezhkin, Nicoletta Liguori, Pengqi Xu, Roberta CroceAbstractIn plants and green algae, light-harvesting complexes (LHCs) are a large family of chlorophyll binding proteins functioning as antennae, collecting solar photons and transferring the absorbed energy to the photosynthetic reaction centers, where light to chemical energy conversion begins. Although LHCs are all highly homologous in their structure and display a variety of common features, each complex finds a specif...
Source: Biochimica et Biophysica Acta (BBA) Bioenergetics - January 26, 2020 Category: Biochemistry Source Type: research
Embelin averts MPTP-induced dysfunction in mitochondrial bioenergetics and biogenesis via activation of SIRT1
Publication date: Available online 24 January 2020Source: Biochimica et Biophysica Acta (BBA) - BioenergeticsAuthor(s): Swetha Pavani Rao, Neelam Sharma, Shasi V. KalivendiAbstractParkinson's disease (PD) is a chronic neurodegenerative disease characterized by the death of dopamine neurons of Substantia nigra pars compacta (SNpc) leading to motor deficits. Amongst the mechanisms proposed, mitochondrial dysfunction, reduced complex-I and PGC1α levels were found to correlate with the pathology of PD. As embelin is a natural product with structural resemblance to ubiquinone, exhibits mitochondrial uncoupling and antioxidant ...
Source: Biochimica et Biophysica Acta (BBA) Bioenergetics - January 26, 2020 Category: Biochemistry Source Type: research
Apoptosis inducing factor: Cellular protective function in Dictyostelium discoideum
Publication date: Available online 25 January 2020Source: Biochimica et Biophysica Acta (BBA) - BioenergeticsAuthor(s): Ashlesha Kadam, Darshan Mehta, Tina Jubin, Mohmmad Shoab Mansuri, Rasheedunnisa BegumAbstractApoptosis Inducing Factor (AIF), a nuclear encoded mitochondrial inter-membrane space flavoprotein with intrinsic NADH oxidase activity, plays an important role in inducing cell death mechanisms. In response to cell death signals, it undergoes mitochondrio-nuclear translocation leading to DNA fragmentation. In addition to its role in cell death, AIF has a pro-survival role, wherein it contributes to the maintenanc...
Source: Biochimica et Biophysica Acta (BBA) Bioenergetics - January 26, 2020 Category: Biochemistry Source Type: research
Respiratory complex I – Mechanistic insights and advances in structure determination
Publication date: Available online 11 January 2020Source: Biochimica et Biophysica Acta (BBA) - BioenergeticsAuthor(s): Etienne Galemou Yoga, Heike Angerer, Kristian Parey, Volker ZickermannAbstractComplex I is the largest and most intricate redox-driven proton pump of the respiratory chain. The structure of bacterial and mitochondrial complex I has been determined by X-ray crystallography and cryo-EM at increasing resolution. The recent cryo-EM structures of the complex I-like NDH complex and membrane bound hydrogenase open a new and more comprehensive perspective on the complex I superfamily. Functional studies and molec...
Source: Biochimica et Biophysica Acta (BBA) Bioenergetics - January 12, 2020 Category: Biochemistry Source Type: research
Binding of red form of Orange Carotenoid Protein (OCP) to phycobilisome is not sufficient for quenching
Publication date: Available online 11 January 2020Source: Biochimica et Biophysica Acta (BBA) - BioenergeticsAuthor(s): Wenjing Lou, Dariusz M. Niedzwiedzki, Ruidong J. Jiang, Robert E. Blankenship, Haijun LiuAbstractThe Orange Carotenoid Protein (OCP) is responsible for photoprotection in many cyanobacteria. Absorption of blue light drives the conversion of the orange, inactive form (OCPO) to the red, active form (OCPR). Concomitantly, the N–terminal domain (NTD) and the C–terminal domain (CTD) of OCP separate, which ultimately leads to the formation of a quenched OCPR–PBS complex. The details of the photoactivation...
Source: Biochimica et Biophysica Acta (BBA) Bioenergetics - January 12, 2020 Category: Biochemistry Source Type: research
PGR5 and NDH-1 systems do not function as protective electron acceptors but mitigate the consequences of PSI inhibition
Publication date: Available online 11 January 2020Source: Biochimica et Biophysica Acta (BBA) - BioenergeticsAuthor(s): Sanna Rantala, Tapio Lempiäinen, Caterina Gerotto, Arjun Tiwari, Eva-Mari Aro, Mikko TikkanenAbstractAvoidance of photoinhibition at photosystem (PS)I is based on synchronized function of PSII, PSI, Cytochrome b6f and stromal electron acceptors. Here, we used a special light regime, PSI photoinhibition treatment (PIT), in order to specifically inhibit PSI by accumulating excess electrons at the photosystem (Tikkanen and Frebe, 2018). In the analysis, Arabidopsis thaliana WT was compared to the pgr5 and n...
Source: Biochimica et Biophysica Acta (BBA) Bioenergetics - January 11, 2020 Category: Biochemistry Source Type: research
Editorial Board
Publication date: 1 February 2020Source: Biochimica et Biophysica Acta (BBA) - Bioenergetics, Volume 1861, Issue 2Author(s): (Source: Biochimica et Biophysica Acta (BBA) Bioenergetics)
Source: Biochimica et Biophysica Acta (BBA) Bioenergetics - January 1, 2020 Category: Biochemistry Source Type: research
Kinetic and structural insight into a role of the re-face Tyr328 residue of the homodimer type ferredoxin-NADP+ oxidoreductase from Rhodopseudomonas palustris in the reaction with NADP+/NADPH
Publication date: Available online 12 December 2019Source: Biochimica et Biophysica Acta (BBA) - BioenergeticsAuthor(s): Daisuke Seo, Norifumi Muraki, Genji KurisuAbstractAmong the thioredoxin reductase-type ferredoxin-NAD(P)+ oxidoreductase (FNR) family, FNR from photosynthetic purple non‑sulfur bacterium Rhodopseudomonas palustris (RpFNR) is distinctive because the predicted residue on the re-face of the isoalloxazine ring portion of the FAD prosthetic group is a tyrosine. Here, we report the crystal structure of wild type RpFNR and kinetic analyses of the reaction of wild type, and Y328F, Y328H and Y328S mutants with ...
Source: Biochimica et Biophysica Acta (BBA) Bioenergetics - December 13, 2019 Category: Biochemistry Source Type: research
Decreased photosystem II activity facilitates acclimation to fluctuating light in the understory plant Paris polyphylla
In this study, we compared chlorophyll fluorescence, PSI redox state and the electrochromic shift signal under fluctuating light between an understory plant Paris polyphylla (Liliaceae) and a light-demanding plant Bletilla striata (Orchidaceae). Within the first seconds after transition from low to high light, PSI was highly oxidized in P. polyphylla but was highly reduced in B. striata, although both species could not generate a sufficient trans-thylakoid proton gradient (ΔpH). Furthermore, the outflow of electrons from PSI to O2 was not significant in P. polyphylla, as indicated by the P700 redox kinetics upon dark-to-l...
Source: Biochimica et Biophysica Acta (BBA) Bioenergetics - December 9, 2019 Category: Biochemistry Source Type: research
Simulation of a nonphotochemical quenching in plant leaf under different light intensities
Publication date: Available online 9 December 2019Source: Biochimica et Biophysica Acta (BBA) - BioenergeticsAuthor(s): Ekaterina Sukhova, Andrey Khlopkov, Vladimir Vodeneev, Vladimir SukhovAbstractAn analysis of photosynthetic response on action of stressors is an important problem, which can be solved by experimental and theoretical methods, including mathematical modeling of photosynthetic processes. The aim of our work was elaboration of a mathematical model, which simulated development of a nonphotochemical quenching under different light conditions. We analyzed two variants of the model: the first variant included a ...
Source: Biochimica et Biophysica Acta (BBA) Bioenergetics - December 9, 2019 Category: Biochemistry Source Type: research
Red-shifted chlorophyll a bands allow uphill energy transfer to photosystem II reaction centers in an aerial green alga, Prasiola crispa, harvested in Antarctica
Publication date: Available online 9 December 2019Source: Biochimica et Biophysica Acta (BBA) - BioenergeticsAuthor(s): Makiko Kosugi, Shin-Ichiro Ozawa, Yuichiro Takahashi, Yasuhiro Kamei, Shigeru Itoh, Sakae Kudoh, Yasuhiro Kashino, Hiroyuki KoikeAbstractAn aerial green alga, Prasiola crispa (Lightf.) Menegh, which is known to form large colonies in Antarctic habitats, is subject to severe environmental stresses due to low temperature, draught and strong sunlight in summer. A considerable light-absorption by long-wavelength chlorophylls (LWC) at around 710 nm, which seem to consist of chlorophyll a, was detected in tha...
Source: Biochimica et Biophysica Acta (BBA) Bioenergetics - December 9, 2019 Category: Biochemistry Source Type: research
Fine-tuning of the respiratory complexes stability and supercomplexes assembly in cells defective of complex III
In this study, we used genetically and biochemically well characterized cells bearing the pathogenic microdeletion m.15,649–15,666 (ΔI300-P305) in MT-CYB gene, to investigate the effects of an assembly-hampered CIII on the re-organization of supercomplexes. First, we found that this mutation also affects the stability of both CI and CIV, and evidences the occurrence of a preferential structural interaction between CI and CIII2, yielding a small amount of active CI + CIII2 supercomplex. Indeed, a residual CI + CIII combined redox activity, and a low but detectable ATP synthesis driven by CI substrates are detecta...
Source: Biochimica et Biophysica Acta (BBA) Bioenergetics - December 9, 2019 Category: Biochemistry Source Type: research
