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D1:Glu244 and D1:Tyr246 of the bicarbonate-binding environment of Photosystem II moderate high light susceptibility and electron transfer through the quinone-Fe-acceptor complex
Publication date: Available online 20 July 2019Source: Biochimica et Biophysica Acta (BBA) - BioenergeticsAuthor(s): Jack A. Forsman, Imre Vass, Julian J. Eaton-RyeAbstractIn cyanobacteria, Glu-244 and Tyr-246 of the Photosystem II (PS II) D1 protein are hydrogen bonded to two water molecules that are part of a hydrogen-bond network between the bicarbonate ligand to a non-heme iron and the cytosol. Ala substitutions were introduced in Synechocystis sp. PCC 6803 to investigate the roles of these residues and the hydrogen-bond network on electron transfer between the primary plastoquinone acceptor, QA, and the secondary plas...
Source: Biochimica et Biophysica Acta (BBA) Bioenergetics - July 20, 2019 Category: Biochemistry Source Type: research

Binding of ferredoxin NADP+ oxidoreductase (FNR) to plant photosystem I
Publication date: Available online 20 July 2019Source: Biochimica et Biophysica Acta (BBA) - BioenergeticsAuthor(s): Pini Marco, Tamar Elman, Iftach YacobyAbstractThe binding of FNR to PSI has been postulated long ago, however, a clear evidence is still missing. In this work, using isothermal titration calorimetry (ITC), we found that FNR binds to photosystem I with its light harvesting complex I (PSI-LHCI) from C. reinhardtii with a 1:1 stoichiometry, a Kd of ~0.8 μM and ∆H of −20.7 kcal/mol. Titrations at different temperatures were used to determine the heat capacity change, ∆CP, of the binding, through which...
Source: Biochimica et Biophysica Acta (BBA) Bioenergetics - July 20, 2019 Category: Biochemistry Source Type: research

Editorial Board
Publication date: 1 August 2019Source: Biochimica et Biophysica Acta (BBA) - Bioenergetics, Volume 1860, Issue 8Author(s): (Source: Biochimica et Biophysica Acta (BBA) Bioenergetics)
Source: Biochimica et Biophysica Acta (BBA) Bioenergetics - July 20, 2019 Category: Biochemistry Source Type: research

Insights into the mechanisms and dynamics of energy transfer in plant light-harvesting complexes from two-dimensional electronic spectroscopy
This article is part of a Special Issue entitled Light harvesting, edited by Dr. Roberta Croce.Graphical abstract (Source: Biochimica et Biophysica Acta (BBA) Bioenergetics)
Source: Biochimica et Biophysica Acta (BBA) Bioenergetics - July 19, 2019 Category: Biochemistry Source Type: research

Calculated vibrational properties of semiquinones in the A1 binding site in photosystem I
Publication date: Available online 12 July 2019Source: Biochimica et Biophysica Acta (BBA) - BioenergeticsAuthor(s): Leyla Rohani, Hiroki Makita, Andrew Levitz, Maged Henary, Gary HastingsAbstractTime-resolved (P700+A1− – P700A1) FTIR difference spectra have been obtained using photosystem I (PSI) particles with several different quinones incorporated into the A1 protein binding site. Difference spectra were obtained for PSI with unlabeled and 18O labeled phylloquinone (2-methyl-3-phytyl-1,4-naphthoquinone) and 2-methyl-1,4-naphthaquinone (2MNQ) incorporated, and for PSI with unlabeled 2,3-dimethyl-1,4-naphthoquinone (...
Source: Biochimica et Biophysica Acta (BBA) Bioenergetics - July 13, 2019 Category: Biochemistry Source Type: research

The amazing phycobilisome
Publication date: Available online 12 July 2019Source: Biochimica et Biophysica Acta (BBA) - BioenergeticsAuthor(s): Noam Adir, Shira Bar-Zvi, Dvir HarrisAbstractCyanobacteria and red-algae share a common light-harvesting complex which is different than all other complexes which serve as photosynthetic antennas – the Phycobilisome (PBS). The PBS is found attached to the stromal side of thylakoid membranes, filling up most of the gap between individual thylakoids. The PBS self assembles from similar homologous protein units that are soluble and contain conserved cysteine residues that covalently bind the light absorbing c...
Source: Biochimica et Biophysica Acta (BBA) Bioenergetics - July 12, 2019 Category: Biochemistry Source Type: research

Digitonin-sensitive LHCII enlarges the antenna of Photosystem I in stroma lamellae of Arabidopsis thaliana after far-red and blue-light treatment
Publication date: Available online 9 July 2019Source: Biochimica et Biophysica Acta (BBA) - BioenergeticsAuthor(s): Peter Bos, Anniek Oosterwijk, Rob Koehorst, Arjen Bader, John Philippi, Herbert van Amerongen, Emilie WientjesAbstractLight drives photosynthesis. In plants it is absorbed by light-harvesting antenna complexes associated with Photosystem I (PSI) and photosystem II (PSII). As PSI and PSII work in series, it is important that the excitation pressure on the two photosystems is balanced. When plants are exposed to illumination that overexcites PSII, a special pool of the major light-harvesting complex LHCII is ph...
Source: Biochimica et Biophysica Acta (BBA) Bioenergetics - July 10, 2019 Category: Biochemistry Source Type: research

Editorial Board
Publication date: 1 July 2019Source: Biochimica et Biophysica Acta (BBA) - Bioenergetics, Volume 1860, Issue 7Author(s): (Source: Biochimica et Biophysica Acta (BBA) Bioenergetics)
Source: Biochimica et Biophysica Acta (BBA) Bioenergetics - July 3, 2019 Category: Biochemistry Source Type: research

Mitochondrial respirasome works as a single unit and the cross-talk between complexes I, III2 and IV stimulates NADH dehydrogenase activity
Publication date: Available online 25 June 2019Source: Biochimica et Biophysica Acta (BBA) - BioenergeticsAuthor(s): Meztli Reyes-Galindo, Roselia Suarez, Mercedes Esparza-Perusquía, Jaime de Lira-Sánchez, J. Pablo Pardo, Federico Martínez, Oscar Flores-HerreraAbstractUstilago maydis is an aerobic basidiomycete that depends on oxidative phosphorylation for its ATP supply, pointing to the mitochondrion as a key player in its energy metabolism. Mitochondrial respiratory complexes I, III2, and IV occur in supramolecular structures named respirasome. In this work, we characterized the subunit composition and the kinetics of...
Source: Biochimica et Biophysica Acta (BBA) Bioenergetics - June 27, 2019 Category: Biochemistry Source Type: research

Interaction between γC87 and γR242 residues participates in energy coupling between catalysis and proton translocation in Escherichia coli ATP synthase
This study should provide more information of residue interactions at the rotor and stator interface in order to further elucidate the energetic mechanism of ATP synthase. (Source: Biochimica et Biophysica Acta (BBA) Bioenergetics)
Source: Biochimica et Biophysica Acta (BBA) Bioenergetics - June 27, 2019 Category: Biochemistry Source Type: research

Single-molecule study of redox control involved in establishing the spinach plastocyanin-cytochrome b6f electron transfer complex
Publication date: Available online 24 June 2019Source: Biochimica et Biophysica Acta (BBA) - BioenergeticsAuthor(s): Guy E. Mayneord, Cvetelin Vasilev, Lorna A. Malone, David J.K. Swainsbury, C. Neil Hunter, Matthew P. JohnsonAbstractSmall diffusible redox proteins play a ubiquitous role in bioenergetic systems, facilitating electron transfer (ET) between membrane bound complexes. Sustaining high ET turnover rates requires that the association between extrinsic and membrane-bound partners is highly specific, yet also sufficiently weak to promote rapid post-ET separation. In oxygenic photosynthesis the small soluble electro...
Source: Biochimica et Biophysica Acta (BBA) Bioenergetics - June 25, 2019 Category: Biochemistry Source Type: research

Mitochondrial cristae narrowing upon higher 2-oxoglutarate load
Publication date: Available online 25 June 2019Source: Biochimica et Biophysica Acta (BBA) - BioenergeticsAuthor(s): Andrea Dlasková, Tomáš Špaček, Hana Engstová, Jitka Špačková, Adam Schröfel, Blanka Holendová, Katarína Smolková, Lydie Plecitá-Hlavatá, Petr JežekAbstractHypoxia causes mitochondrial cristae widening, enabled by the ~20% degradation of Mic60/mitofilin, with concomitant clustering of the MICOS complex, reflecting the widening of crista junctions (outlets) (Plecitá-Hlavatá et al. FASEB J., 2016 30:1941–1957). Attempting to accelerate metabolism by the addition of membrane-permeant dimethyl...
Source: Biochimica et Biophysica Acta (BBA) Bioenergetics - June 25, 2019 Category: Biochemistry Source Type: research

Multiple pathways of charge recombination revealed by the temperature dependence of electron transfer kinetics in cyanobacterial photosystem I
Publication date: Available online 25 June 2019Source: Biochimica et Biophysica Acta (BBA) - BioenergeticsAuthor(s): Georgy Milanovsky, Oksana Gopta, Anastasia Petrova, Mahir Mamedov, Michael Gorka, Dmitry Cherepanov, John H. Golbeck, Alexey SemenovAbstractThe kinetics of charge recombination in Photosystem I P700-FA/FB complexes and P700-FX cores lacking the terminal iron‑sulfur clusters were studied over a temperatures range of 310 K to 4.2 K. Analysis of the charge recombination kinetics in this temperature range allowed the assignment of backward electron transfer from the different electron acceptors to P700+. T...
Source: Biochimica et Biophysica Acta (BBA) Bioenergetics - June 25, 2019 Category: Biochemistry Source Type: research

Bicarbonate rescues damaged proton-transfer pathway in photosystem II
In this study, we have used bicarbonate as a mobile exogenous proton-transfer reagent to recover the activity lost by site-directed mutations in order to identify amino-acid residues participating in the proton-transfer pathway. We find that bicarbonate restores efficient S-state cycling in D2-K317A PSII core complexes, but not in D1-D61A and CP43-R357K PSII core complexes, indicating that bicarbonate chemical rescue can be used to differentiate single-point mutations affecting the pathways of proton transfer from mutations that affect other aspects of the water-oxidation mechanism. (Source: Biochimica et Biophysica Acta (BBA) Bioenergetics)
Source: Biochimica et Biophysica Acta (BBA) Bioenergetics - June 24, 2019 Category: Biochemistry Source Type: research

Mechanistic insight into heterogeneity of trans-plasma membrane electron transport in cancer cell types
Publication date: Available online 20 June 2019Source: Biochimica et Biophysica Acta (BBA) - BioenergeticsAuthor(s): Harry G. Sherman, Carolyn Jovanovic, Alaa Abuawad, Dong-Hyun Kim, Hilary Collins, James E. Dixon, Robert Cavanagh, Robert Markus, Snow Stolnik, Frankie J. RawsonAbstractTrans-plasma membrane electron transfer (tMPET) is a process by which reducing equivalents, either electrons or reductants like ascorbic acid, are exported to the extracellular environment by the cell. TPMET is involved in a number of physiological process and has been hypothesised to play a role in the redox regulation of cancer metabolism. ...
Source: Biochimica et Biophysica Acta (BBA) Bioenergetics - June 21, 2019 Category: Biochemistry Source Type: research