Photosynth Res. Plastoquinone (PQ) and ubiquinone (UQ) are electron carriers in the chlETC and the mtETC, respectively. Frederick Crane. Albertsson PA, Hsu BD, Tang GM, Arnon DI. 7. 1980 Dec;77(12):7227-31. doi: 10.1073/pnas.77.12.7227. The extracted fragments (chlorophyll:plastoquinone ratio, 900: 1) showed no P-680 photooxidation at 15 K after a single laser flash. NADPH, plastoquinone, ferrodoxine, cytokinine (cytochrome C) What happens first in photosynthesis? Dibromothymoquinone and its hydroquinone are inhibitors of non cyclic electron flow from water to NADP, anthraquinone or methylviologen. It is a lipophilic carrier molecule and an obligatory functional component of photosynthesis. The role of plastoquinone C. April 1967; Journal of Biological Chemistry 242(6):1155-9; Source; PubMed; Authors: M D Henninger. On the Role of Plastoquinone in Photosynthesis : The Effect of Dibromothymoquinone, an Antagonist of Plastoquinone, on Non Cyclic and Cyclic Electron Flow Systems in Isolated Chloroplasts Author: Böhme, H., Reimer, S., Trebst, A. Photosynth Res.  |  a coupling site, has been identified between plastoquinone and cytochrome f Polyunsaturated side-chain quinone derivative which is an important link in the electron transport chain of green plants during the photosynthetic conversion of light energy by photophosphorylation into the potential energy of chemical bonds. soluble plastoquinone-9 (PQ) connects the reducing activity of PSII to the oxidizing activity of the b 6 f complex, while the soluble protein plastocyanin, is reduced by the b 6 f activity and oxidized by PSI [1,2]. Oxygenic photoreduction of ferredoxin independently of the membrane-bound iron-sulfur centers of photosystem I. they pass to plastoquinone (PQ) and on back into the cytochrome b 6 /f complex. Plastoquinone is one of the three types of electron carriers involved in the photosynthetic electron transport chain. Role of triose phosphate. Get the latest public health information from CDC: https://www.coronavirus.gov, Get the latest research information from NIH: https://www.nih.gov/coronavirus, Find NCBI SARS-CoV-2 literature, sequence, and clinical content: https://www.ncbi.nlm.nih.gov/sars-cov-2/. Treatment of lamellar fragments with neutral detergents releases these particles, designated photosystem I and photosystem II, respectively. These adaptational changes are visualised in Fig. 1983 Jul;80(13):3971-5. doi: 10.1073/pnas.80.13.3971. Please enable it to take advantage of the complete set of features! Photoreduction of ferredoxin with various electron donors: Support for the Z scheme of photosynthetic electron transport. The elucidation of plastoquinone function has been greatly facilitated by investigations with specific inhibitors. What is the role of plastoquinone and what is the role of plastocyanin? 1984 Apr;81(7):2070-4. doi: 10.1073/pnas.81.7.2070. Source: Zeitschrift für Naturforschung … Clipboard, Search History, and several other advanced features are temporarily unavailable. Photosynthesis - Photosynthesis - Photosystems I and II: The structural and photochemical properties of the minimum particles capable of performing light reactions I and II have received much study. Energy capture in photosynthesis: photosystem II. Role of bicarbonate in photosystem II, the water-plastoquinone oxido-reductase of plant photosynthesis Jack J. S. van Rensena,*, Chunhe Xub and Govindjeec aThe Graduate School of Experimental Plant Sciences, Laboratory of Plant Physiology, Agricultural Uni6ersity, Arboretumlaan 4, 6703BD Wageningen, The … The first stage of photosynthesis uses an enzyme confusingly called "photosystem II ". On the Role of Plastoquinone in Photosynthesis. Biochem Biophys Res Commun. These transfers are coupled with the pumping of two more hydrogen ions into the lumen space by cytochrome b6-f. Perspective on Daniel I. Arnon's contributions to research, 1960-1994. glycerate 3-phosphate is reduced to triose phosphate. 1975;44:409-33. doi: 10.1146/annurev.bi.44.070175.002205. Electron transport between plastoquinone and chlorophyll Ai in chloroplasts. NIH Get the latest public health information from CDC: https://www.coronavirus.gov, Get the latest research information from NIH: https://www.nih.gov/coronavirus, Find NCBI SARS-CoV-2 literature, sequence, and clinical content: https://www.ncbi.nlm.nih.gov/sars-cov-2/, NLM Biochim Biophys Acta. Would you like email updates of new search results? Since they are lipid soluble, they can diffuse through the membrane. The role of plastoquinone in the in vivo photosynthetic cyclic electron transport pathway in algae The duration of the inhibitory effect, as tested here and in the previous study [19], was, in both cases, related to the nature of the antioxidant moiety, decreasing in the series [alpha]-tocopherol ~ ubiquinol > plastoquinol, independently of the rest of the structure of the antioxidant; compare Figures 5-7, 9, and 10, Table 1, and [19]. change. Please enable it to take advantage of the complete set of features! Among the other electron carriers of the photosynthetic electron transport chain, plastoquinone is unique as it not only shuttles electrons but also simultaneously protons across the thylakoid membrane during its catalytic cycle. Membrane-bound iron-sulfur centers in photosynthetic systems. 1995 Nov;46(1-2):27-35. doi: 10.1007/BF00020412. Different roles of plastoquinone in the photoreduction of ferredoxin and of membrane-bound iron-sulfur centers of chloroplasts. As all these electron transport pathways meet on the level of free plastoquinones, the state of plastoquinone pool can be expected to play a key role in regulation, including plant adaptation to changes in light intensity and spectral composition. Trebst A, Depka B, Kraft B, Johanningmeier U. Photosynth Res. Participa en el proceso anabólico de la fotosíntesis de las plantas, algas y las cianobacterias, a la que les otorga autonomía en cuanto a su nutrición (autótrofos). Proc Natl Acad Sci U S A. Plastoquinone definition is - a plant substance that is related to vitamin K and plays a role in photosynthetic phosphorylation. A. Trebst. 1977 Sep;74(9):3826-30. doi: 10.1073/pnas.74.9.3826. [Primary reaction and electron transport in photosystem II]. Besides its main role as proton and electron carrier, PQ is an active player in the short and long term light adaptation responses Interaction between the intermediary electron acceptor (pheophytin) and a possible plastoquinone-iron complex in photosystem II reaction centers. 1972 May;49(5):769-74. doi: 10.1104/pp.49.5.769. Plastoquinone is localized in … 1983 Sep 15;115(2):722-9. doi: 10.1016/s0006-291x(83)80204-6.  |  Extraction of Triton Photosystem II chloroplast fragments with 0.2% methanol in hexane for 3 h results in the removal of 90 to 95% of the plastoquinone in the original preparation. Light-Dependent reactions of photosynthesis uses an enzyme confusingly called `` photosystem II `` role reduced... Uses an enzyme confusingly called `` photosystem II ] divergent pathways of photosynthetic electron transport chain in the electron chain! And electron transport: photoreduction of ferredoxin independently of the complete set of features divergent pathways photosynthetic... 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