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Structural analysis and comparison of light-harvesting complexes I and II
This article is part of a Special Issue entitled Light harvesting, edited by Dr. Roberta Croce. (Source: Biochimica et Biophysica Acta (BBA) Bioenergetics)
Source: Biochimica et Biophysica Acta (BBA) Bioenergetics - June 21, 2019 Category: Biochemistry Source Type: research

The relevance of dynamic thylakoid organisation to photosynthetic regulation
Publication date: Available online 20 June 2019Source: Biochimica et Biophysica Acta (BBA) - BioenergeticsAuthor(s): Matthew P. Johnson, Emilie WientjesAbstractThe higher plant chloroplast thylakoid membrane system performs the light-dependent reactions of photosynthesis. These provide the ATP and NADPH required for the fixation of CO2 into biomass by the Calvin-Benson cycle and a range of other metabolic reactions in the stroma. Land plants are frequently challenged by fluctuations in their environment, such as light, nutrient and water availability, which can create a mismatch between the amounts of ATP and NADPH produce...
Source: Biochimica et Biophysica Acta (BBA) Bioenergetics - June 20, 2019 Category: Biochemistry Source Type: research

Light stress in green and red Planktothrix strains: The orange carotenoid protein and its related photoprotective mechanism
In this study, we characterized OCP and the related photoprotective mechanism in non-stressed and light-stressed cells of three different strains of Planktothrix that can form impressive blooms. In addition to changing lake ecosystemic functions and biodiversity, Planktothrix blooms can have adverse effects on human and animal health as they produce toxins (e.g., microcystins). Three Planktothrix strains were selected: two green strains, PCC 10110 (microcystin producer) and PCC 7805 (non-microcystin producer), and one red strain, PCC 7821. The green strains colonize shallow lakes with higher light intensities while red str...
Source: Biochimica et Biophysica Acta (BBA) Bioenergetics - June 20, 2019 Category: Biochemistry Source Type: research

Mechanisms of sublethal copper toxicity damage to the photosynthetic apparatus of Rhodospirillum rubrum
Publication date: Available online 19 June 2019Source: Biochimica et Biophysica Acta (BBA) - BioenergeticsAuthor(s): Noelia Jaime-Pérez, David Kaftan, David Bína, Syed Nadeem Hussain Bokhari, Sowmya Shreedhar, Hendrik KüpperAbstractMagnesium (Mg2+) is the ubiquitous metal ion present in chlorophyll and bacteriochlorophyll (BChl), involved in photosystems in photosynthetic organisms. In the present study we investigated targets of toxic copper binding to the photosynthetic apparatus of the anoxygenic purple bacterium Rhodospirillum rubrum. This was done by a combination of in vivo measurements of flash photolysis and fas...
Source: Biochimica et Biophysica Acta (BBA) Bioenergetics - June 19, 2019 Category: Biochemistry Source Type: research

Carbonic anhydrase CAH3 supports the activity of photosystem II under increased pH
Publication date: Available online 19 June 2019Source: Biochimica et Biophysica Acta (BBA) - BioenergeticsAuthor(s): Vasily V. Terentyev, Anna K. Shukshina, Alexandr V. ShitovAbstractThe lumenal carbonic anhydrase (CA) CAH3 from green alga Chlamydomonas reinhardtii is the only one CA identified so far in close association with the photosystem II (PSII) multi-subunit protein complex. It was proposed earlier, that CAH3 could facilitate the H+ removal from the active center of the PSII water-oxidizing complex (WOC) under the light, thereby increasing its activity. In the present work, using PSII enriched membranes from the wi...
Source: Biochimica et Biophysica Acta (BBA) Bioenergetics - June 19, 2019 Category: Biochemistry Source Type: research

Mutations in a conserved loop in the PSST subunit of respiratory complex I affect ubiquinone binding and dynamics
Publication date: Available online 19 June 2019Source: Biochimica et Biophysica Acta (BBA) - BioenergeticsAuthor(s): Etienne Galemou Yoga, Outi Haapanen, Ilka Wittig, Karin Siegmund, Vivek Sharma, Volker ZickermannAbstractRespiratory complex I catalyses the reduction of ubiquinone (Q) from NADH coupled to proton pumping across the inner membrane of mitochondria. The electrical charging of the inner mitochondrial membrane drives the synthesis of ATP, which is used to power biochemical reactions of the cell. The recent surge in structural data on complex I from bacteria and mitochondria have contributed to significant unders...
Source: Biochimica et Biophysica Acta (BBA) Bioenergetics - June 19, 2019 Category: Biochemistry Source Type: research

Monomeric light harvesting complexes enhance excitation energy transfer from LHCII to PSII and control their lateral spacing in thylakoids
Publication date: Available online 19 June 2019Source: Biochimica et Biophysica Acta (BBA) - BioenergeticsAuthor(s): Luca Dall'Osto, Stefano Cazzaniga, Dario Zappone, Roberto BassiAbstractProper assembly of plant photosystem II, in the appressed region of thylakoids, allows for both efficient light harvesting and the dissipation of excitation energy absorbed in excess. The core moiety of wild type supercomplex is associated with monomeric antennae that, in turn, bind peripheral trimeric LHCII complexes. Acclimation to light environment dynamics involves structural plasticity within PSII-LHCs supercomplexes, including deple...
Source: Biochimica et Biophysica Acta (BBA) Bioenergetics - June 19, 2019 Category: Biochemistry Source Type: research

Identification of Surf1 as an assembly factor of the cytochrome bc1-aa3 supercomplex of Actinobacteria
Publication date: Available online 19 June 2019Source: Biochimica et Biophysica Acta (BBA) - BioenergeticsAuthor(s): Cedric-Farhad Davoudi, Paul Ramp, Meike Baumgart, Michael BottAbstractRespiration in aerobic Actinobacteria involves a cytochrome bc1-aa3 supercomplex with a diheme cytochrome c1, first isolated from Corynebacterium glutamicum. Synthesis of a functional cytochrome c oxidase requires incorporation of CuA, CuB, heme a, and heme a3. In contrast to eukaryotes and α-proteobacteria, this process is poorly understood in Actinobacteria. Here, we analyzed the role of a Surf1 homolog of C. glutamicum in the formation...
Source: Biochimica et Biophysica Acta (BBA) Bioenergetics - June 19, 2019 Category: Biochemistry Source Type: research

The pathogenic MT-ATP6 m.8851T>C mutation prevents proton movements within the n-side hydrophilic cleft of the membrane domain of ATP synthase
Publication date: Available online 8 June 2019Source: Biochimica et Biophysica Acta (BBA) - BioenergeticsAuthor(s): Roza Kucharczyk, Alain Dautant, Kewin Gombeau, François Godard, Déborah Tribouillard-Tanvier, Jean-Paul di RagoAbstractDozens of pathogenic mutations have been localized in the mitochondrial gene (MT-ATP6) that encodes the subunit a of ATP synthase. The subunit a together with a ring of identical subunits c moves protons across the mitochondrial inner membrane coupled to rotation of the subunit c-ring and ATP synthesis. One of these mutations, m.8851T>C, has been associated with bilateral striatal lesions o...
Source: Biochimica et Biophysica Acta (BBA) Bioenergetics - June 8, 2019 Category: Biochemistry Source Type: research

The roles of the chaperone-like protein CpeZ and the phycoerythrobilin lyase CpeY in phycoerythrin biogenesis
Publication date: Available online 4 June 2019Source: Biochimica et Biophysica Acta (BBA) - BioenergeticsAuthor(s): Christina M. Kronfel, Avijit Biswas, Jacob P. Frick, Andrian Gutu, Tyler Blensdorf, Jonathan A. Karty, David M. Kehoe, Wendy M. SchluchterAbstractPhycoerythrin (PE) present in the distal ends of light-harvesting phycobilisome rods in Fremyella diplosiphon (Tolypothrix sp. PCC 7601) contains five phycoerythrobilin (PEB) chromophores attached to six cysteine residues for efficient green light capture for photosynthesis. Chromophore ligation on PE subunits occurs through bilin lyase catalyzed reactions, but the ...
Source: Biochimica et Biophysica Acta (BBA) Bioenergetics - June 5, 2019 Category: Biochemistry Source Type: research

Balanced internal hydration discriminates substrate binding to respiratory complex I
Publication date: Available online 4 June 2019Source: Biochimica et Biophysica Acta (BBA) - BioenergeticsAuthor(s): Murilo Hoias Teixeira, Guilherme Menegon ArantesAbstractMolecular recognition of the amphiphilic electron carrier ubiquinone (Q) by respiratory complexes is a fundamental part of electron transfer chains in mitochondria and many bacteria. The primary respiratory complex I binds Q in a long and narrow protein chamber to catalyse its reduction. But, the binding mechanism and the role of chamber hydration in substrate selectivity and stability are unclear. Here, large-scale atomistic molecular dynamics simulatio...
Source: Biochimica et Biophysica Acta (BBA) Bioenergetics - June 4, 2019 Category: Biochemistry Source Type: research

Light harvesting complexes in chlorophyll c-containing algae
This article is part of a Special Issue entitled Light harvesting, edited by Dr. Roberta Croce. (Source: Biochimica et Biophysica Acta (BBA) Bioenergetics)
Source: Biochimica et Biophysica Acta (BBA) Bioenergetics - May 31, 2019 Category: Biochemistry Source Type: research

Editorial Board
Publication date: 1 June 2019Source: Biochimica et Biophysica Acta (BBA) - Bioenergetics, Volume 1860, Issue 6Author(s): (Source: Biochimica et Biophysica Acta (BBA) Bioenergetics)
Source: Biochimica et Biophysica Acta (BBA) Bioenergetics - May 18, 2019 Category: Biochemistry Source Type: research

Temperature dependence of the high-spin S2 to S3 transition in Photosystem II: Mechanistic consequences
Publication date: Available online 4 May 2019Source: Biochimica et Biophysica Acta (BBA) - BioenergeticsAuthor(s): Alain BoussacAbstractThe Mn4CaO5-cluster in Photosystem II advances through five oxidation states, S0 to S4, before water is oxidized and O2 is generated. The S2-state exhibits either a low-spin, S = 1/2 (S2LS), or a high-spin state, S = 5/2 (S2HS). Increasing the pH favors the S2HS configuration and mimics the formation of TyrZ in the S2LS-state at lower pH values (Boussac et al. Biochim. Biophys. Acta 1859 (2018) 342). Here, the temperature dependence of the S2HS to S3 transition was studied by EPR s...
Source: Biochimica et Biophysica Acta (BBA) Bioenergetics - May 4, 2019 Category: Biochemistry Source Type: research

Single-molecule microscopy studies of LHCII enriched in Vio or Zea
Publication date: Available online 2 May 2019Source: Biochimica et Biophysica Acta (BBA) - BioenergeticsAuthor(s): Marijonas Tutkus, Francesco Saccon, Jevgenij Chmeliov, Oskaras Venckus, Ignas Ciplys, Alexander V. Ruban, Leonas ValkunasAbstractPlants have developed multiple self-regulatory mechanisms to efficiently function under varying sunlight conditions. At high light intensities, non-photochemical quenching (NPQ) is activated on a molecular level, safely dissipating an excess excitation as heat. The exact molecular mechanism for NPQ is still under debate, but it is widely agreed that the direct participation of the ca...
Source: Biochimica et Biophysica Acta (BBA) Bioenergetics - May 4, 2019 Category: Biochemistry Source Type: research