In addition to the complexes, three mobile carriers are also involved: Plastoquinone Qb, Plastocyanin, and Ferredoxin. Their redox states are pivotal indices determining the electron transport efficiency in each ETC. HHS Xu JJ, Fang X, Li CY, Zhao Q, Martin C, Chen XY, Yang L. Front Plant Sci. COVID-19 is an emerging, rapidly evolving situation. Subject Matter of Electron Transport Chain: The primary function in photosynthesis is the raising of an electron to a higher energy level in chlorophyll. sphaeroides. Plastoquinone (PQ) and ubiquinone (UQ) are electron carriers in the chlETC and the mtETC, respectively. Plastoquinone (PQ) and ubiquinone (UQ) are two important prenylquinones, functioning as electron transporters in the electron transport chain of oxygenic photosynthesis and the aerobic respiratory chain, respectively, and play indispensable roles in plant growth and development through participating in the biosynthesis and metabolism of important chemical compounds, acting as antioxidants, being … 2011 ). photosynthese photosynthesis P680 P700 photosysteme centre reactionnel complexe Z paire speciale chlorophylle photon electron synthese ATP cycle Q plastoquinone plastocyanine phylloquinone ferredoxine membrane thylacoide chloroplaste plaste biochimej. 1973 Feb 12;301(1):35-51. AbstractThe relative contribution of cyclic compared to linear electron flow depends on the redox poise of electron carriers, and is also dependent upon the relative turnovers of the two photosystems (only photosystem I is involved in cyclic). In addition to linear electron transport from water to NADP +, alternative electron transport pathways are believed to regulate photosynthesis.In the two routes of photosystem I (PSI) cyclic electron transport, electrons are recycled from the stromal reducing pool to plastoquinone (PQ), generating additional ΔpH (proton gradient across thylakoid membranes). Becker KW, Elling FJ, Schröder JM, Lipp JS, Goldhammer T, Zabel M, Elvert M, Overmann J, Hinrichs KU. Plastoquinone-9 (PQ-9) is an essential component of photosynthesis that carries electrons in the linear and alternative electron transport chains, and is also a redox sensor that regulates state transitions and gene expression. DCMU is an herbicide that inhibits electron transport between photosystemII and plastoquinone. The described procedures relies on spinach-chloroplast isolation followed by PQ extraction and chromatographic fractionation. The role of PQ in energy conser-vation (ATP formation) is of particular current interest. In addition to the complexes, three mobile carriers are also involved: Plastoquinone Qb, Plastocyanin, and Ferredoxin. Quantitation of plastoquinone photoreduction in spinach chloroplasts. Please enable it to take advantage of the complete set of features! Information and translations of PLASTOQUINONE in the most comprehensive dictionary definitions resource on the web. See Figure 7.1 (The electron transport chain in photosynthesis and the sites of action of herbicides that interfere with electron transfer in this chain (Q = electron acceptor; PQ = plastoquinone; page 2). In the first part of photosynthesis, the light-dependent reaction, pigment molecules absorb energy from sunlight. Department of Chemistry, Graduate School of Engineering Science, Osaka University, Machikaneyama, Toyonaka, Osaka 560–8531, Japan . 1973 Feb 12;301(1):35-51. eCollection 2018. FEBS Lett. II. interconnecting several electron transport chains. Photosynthetic complex I transfers electrons to the terminal acceptor plastoquinone. Phosphatidylglycerol (PG), a ubiquitous constituent of thylakoid membranes of chloroplasts and cyanobacteria, is demonstrated to be essential for the functionality of plastoquinone electron acceptor QB in the photosystem II reaction center of oxygenic photosynthesis. Log in; Register; Help; Take a Tour; Sign up for a free trial; Subscribe plastoquinone: translation. Some plastoquinones (plastoquinone (PQ E 0 =+ 0.113V) and plastoquinones A (PQA). Plants were grown in controlled environment chambers under high or low irradiance conditions. Green plants have two such transporters, plastoquinone and plastocyanin. The following complexes are found in the photosynthesis electron transport chain: Photosystem II, Cytochrome b6-f, Photosystem I, Ferredoxin NADP Reductase (FNR), and the complex that makes ATP, ATP Synthase. Wykoff DD(1), Davies JP, Melis A, Grossman AR. These are plastoquinone (PQ) plastocyanin (PC), ferredoxin (FD) ELECTRON TRANSPORT This process occurs in several steps. The quinone-binding site is coupled to the proton-pumping machinery in the membrane by a highly conserved charge-redistribution cascade (figs. Photosystem II John Whitmarsh,University of Illinois, Urbana, Illinois, USA Govindjee,University of Illinois, Urbana, Illinois, USA Photosystem II is a specialized protein complex that uses light energy to oxidize water, resulting in the release of molecular oxygen into the atmosphere, and to reduce A split pathway of electron transport is proposed, part going through plastoquinones A and C and part through rubimedin. Photosynth Res. Closely associated with photosystem II. Biochemistry. The role of plastoquinone in the in vivo photosynthetic cyclic electron transport pathway in algae Sci Rep. 2015 Jun 3;5:10919. doi: 10.1038/srep10919. USA.gov. So far only plastoquinone-45 (PQ-45) has been identified as an obligatory functional component of the photosynthetic electron transport chain in chloroplasts between photosystem II and photosystem I. Closely associated with photosystem II . The oxidized form of PSI primary electron donor P + 700 can accumulate in the light, showing that intersystem electron transfer is limited upstream at the level of cytochrome b 6 f activity We use cookies to help provide and enhance our service and tailor content and ads.  |  The most common and abundant pigment is chlorophyll a. To convey electrons from PSII to PSI, one therefore needs couriers—mobile electron-transport proteins. In summary, the cyclic electron transport of the purple bacteria may resemble a simple electric circuit as shown in Figure 3.13. dwykoff@andrew.stanford.edu Reaction kinetics and the function of plastocyanin in situ. Transport of electron from plastoquinone to cytochrome complex. What does PLASTOQUINONE mean? As described below, the It is a lipophilic carrier molecule and an obligatory functional component of photosynthesis. The role of plastoquinone in the in vivo photosynthetic cyclic electron transport pathway in algae. NIH The electrons are transferred (by way of plastoquinone — PQ in the figure) to the cytochrome b 6 /f complex where they provide the energy for chemiosmosis. Biochim Biophys Acta. Spectrophotometric studies of the mechanism of photosynthesis. Since plastoquinone does not receive the electrons the transport of electrons is slowed down and less ATP and NADPH are produced. Electrons from water are then transferred to the P680 molecules that have lost their electrons in the process. Search for more papers by this author. It is, as if, there is a hole in the chlorophyll which invites filling. The complex contains up to three natively plastoquinone (PQ) molecules that forms an electron transfer network that are responsible for the operation of the Q cycle and its redox-sensing and catalytic functions in photosynthesis. Phosphatidylglycerol (PG), a ubiquitous constituent of thylakoid membranes of chloroplasts and cyanobacteria, is demonstrated to be essential for the functionality of plastoquinone electron acceptor QB in the photosystem II reaction center of oxygenic photosynthesis. - The excited electron is transferred back to the ground state by an electron transport chain, called the cytochrome-b/c1 complex ATP and NADH formed by bacterial photosynthesis are used for the synthesis of organic matter; especially important is the synthesis of carbohydrates from CO 2 via the Calvin cycle. doi: 10.1128/AEM.02736-17. Since the electrons On the other hand, electron donation from endogenous substrates to plastoquinone was suggested from decreases in rate of the cytochrome reduction by dark starvation of cells and also … plast. 1 (A) Diagram of linear photosynthesis (solid arrows), respiration (dashed and dotted arrows), and cyclic electron transfer (dashed arrow) in cyanobacteria showing where DCMU and DBMIB block electron flow.In the thylakoid membrane of cyanobacteria photosynthesis and respiration are intermingled, while in the cytoplasmic membrane, only a respiratory pathway is present. This site needs JavaScript to work properly. Masahiro Kaneko. Print 2018 May 15. The specific mode of action is as follows: If foliar applied, herbicide moves through the cuticle into the cell and chloroplast. Specifically, the entry-exit por-tal of plastoquinol/quinone in the lumen (p)-side core of the cyt b6f complex was changed in the cyanobacterium Synechococcus by site-directed mutagenesis to create a modified intra-membrane pathway for plastoquinol-me-diated electron/proton transfer. 1. Among them, the Cyt b 6 / f complex is considered as the rate-limiting step for RuBP regeneration ( Yamori et al. 1973 Feb;18(2):103-13. Absorbance changes of ferredoxin measured at 463 nm in isolated thylakoids were shown to arise from the activity of the enzyme ferredoxin-plastoquinone reductase (FQR) in cyclic electron transport. Fig. Localization of a site of energy coupling between plastoquinone and cytochrome f in the electron-transport chain of spinach chloroplasts. As the electrons pass through the cytochrome chain, protons will pass from the stroma to the lumen. 1963a; Arnon et al. Thus, it is electron transport at the plastoquinone site, the rate-limiting site of electron transport from PS I to PS II, which was modulated to show maximum rates near the growth temperature. 2018 May 1;84(10):e02736-17. Although these views have been built on solid experimental facts gathered over the years ~1963 to ~1987, they have sometimes been overlooked in … Front Plant Sci. We will discuss the excitation of chlorophyll by light and the reduction of the first electron acceptor, the flow of electrons through photosystems II and I, the oxidation of water as the primary source of electrons, and the reduction of the final electron acceptor (NADP +). Electrons from respiratory substrates enter the electron transport chain via plastoquinone reduction by NDH-1 or SDH and are passed on through the cyt b 6 f complex and plastocyanin or cyt c. They then have two possible fates: they could be transferred to a terminal oxidase or they could be transferred to PSI . Lipid Antioxidant and Galactolipid Remodeling under Temperature Stress in Tomato Plants. plastoquinone: translation A quinone present in chloroplasts, forming part of the photosynthetic electron transport chain. Cytochrome f: The regulation of photosynthetic electron transport during nutrient deprivation in Chlamydomonas reinhardtii. The electron transport chain in photosynthesis is processed through a series of electron carriers. 3 (3, 4-dichlorophenyl)—1, di-methylurea (DCMU) blocks, electron transport system between Q and PQA. The … We report a method for the purification of plastoquinone-9 (PQ), a prenylquinone cofactor involved in the photosynthetic electron transport chain. 2. Le transport des électrons. Copyright © 1973 Published by Elsevier B.V. Biochimica et Biophysica Acta (BBA) - Reviews on Bioenergetics, https://doi.org/10.1016/0304-4173(73)90011-6. Specific Interaction between Redox Phospholipid Polymers and Plastoquinone in Photosynthetic Electron Transport Chain. In addition to linear electron transport from water to NADP +, alternative electron transport pathways are believed to regulate photosynthesis.In the two routes of photosystem I (PSI) cyclic electron transport, electrons are recycled from the stromal reducing pool to plastoquinone (PQ), generating additional ΔpH (proton gradient across thylakoid membranes). 1974 Jan 15;38(3):311-4. doi: 10.1016/0014-5793(74)80080-3. It accepts electrons from Q. Appl Environ Microbiol. 1967). 2016 Feb 17;7:167. doi: 10.3389/fpls.2016.00167. ATP production stops but electron transport continues. White CC, Chain RK, Malkin R. Duroquinol as an electron donor for chloroplast electron transfer reactions. The open-circuit electrochemical potential of an electrolyte containing the redox polymer and extracted thylakoid membranes shift to positive (or negative) under light irradiation, when an electron transport inhibitor specific to plastoquinone is added upstream (or downstream) in the photosynthetic electron transport chain. Clipboard, Search History, and several other advanced features are temporarily unavailable. The electron transport chain of photosynthesis is often put in a diagram called the z-scheme, ... where the mobile electron carriers are plastoquinone and cytochrome c 6, while the proton pumps are NADH dehydrogenase, cyt b 6 f and cytochrome aa 3 (member of the COX3 family). (1) EXCITATION OF PS II When chlorophyll a of reaction centre of PS II is striked by a photon, the energy of photon absorbs in it. To convey electrons from PSII to PSI, one therefore needs couriers—mobile electron-transport proteins. These plastoquinone molecules are embedded in the D2 and D1 proteins. [Primary reaction and electron transport in photosystem II]. 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 A quinone present in chloroplasts, forming part of the photosynthetic electron transport chain. Owing to vectorial electron flow across the thylakoid membrane, plastoquinone is thought to be reduced on the outside and plastohydroquinone to be oxidized on the inside of the membrane. Biochim Biophys Acta. Havurinne and Tyystjärvi found that, in the dark, the first component of the electron transport chain, plastoquinone, is more oxidized in kleptoplasts (and therefore can accept more electrons) than in the chloroplasts of the green algae. Plastoquinone (PQ) is an isoprenoid quinone molecule involved in the electron transport chain in the light-dependent reactions of photosynthesis. Tanpakushitsu Kakusan Koso. The electron carriers mediate the transfer of electrons for favoring the production of ATP and NADPH molecules for powering the production of carbohydrates in the Calvin cycle. Although the rate of cyclic electron transport was lower than linear electron transport, it was believed in early studies that both electron transport pathways were essential for carbon fixation.  |  JIB. Therefore, SdhC is a point of contact between photosynthetic and respiratory electron transfer chains in cyanobacteria. The plastoquinones are also quite lipophilic, so their range of motion is restricted to the thylakoid membrane. Copyright © 2021 Elsevier B.V. or its licensors or contributors. The elucidation of plastoquinone function has been greatly facilitated by investigations with specific inhibitors. Extraction of PQ was achieved using partition of chloroplast By continuing you agree to the use of cookies. Since plastoquinone does not receive the electrons the transport of electrons is slowed down and less ATP and NADPH are produced. Plastoquinone is localized in the inner thylakoid membrane of chloroplasts. The function of plastoquinone in photosynthetic electron transport. These are plastoquinone (PQ) plastocyanin (PC), ferredoxin (FD) ELECTRON TRANSPORT This process occurs in several steps. The electrons are transported from the water to photosystem 2 and are further transported to plastoquinone. Haehnel W. Electron transport between plastoquinone and chlorophyll Ai in chloroplasts. A photon strikes photosystem II to initiate photosynthesis. Extraction and reconstitution experiments Among the earliest evidence suggesting that plastoquinones may function as electron carriers in photosynthesis are the results of extraction and reconstitution experiments with organic solvents". Photosynthesis - Photosynthesis - The pathway of electrons: The general features of a widely accepted mechanism for photoelectron transfer, in which two light reactions (light reaction I and light reaction II) occur during the transfer of electrons from water to carbon dioxide, were proposed by Robert Hill and Fay Bendall in 1960. Cyanobacteria are the only bacteria that produce oxygen during photosynthesis. PQ-9isamultilocationcompoundthatis partitioned in the chloroplast between thylakoids, plastoglobules, and enve-lopes. Biochim Biophys Acta. 1977 Mar 11; 459 (3):418–441. The isolation of a cytochrome b 6‐f complex from spinach, which is depleted of plastoquinone (and lipid), is reported. (1) EXCITATION OF PS II When chlorophyll a of reaction centre of PS II is striked by a photon, the energy of photon absorbs in it. In the present study, we designed a system for the measurement of the in vivo redox states of PQ and UQ. MOBILE ELECTRON CARRIERS Transport the excited electrons between the complexes. Author information: (1)Carnegie Institution of Washington, Department of Plant Biology, Stanford, California 94305, USA. Plastoquinone (PQ)-9 is an electron car-rier that plays an essential role in photo-synthesis where it is involved in linear and alternative electron flows. A special form (semiquinone) of PQ-45 acts as primary acceptor Qof photosystem II, a large pool of PQ-45 as electron buffer, Plastoquinone acts as the electron carrier, transferring its two electrons to high- and low-potential electron transport chains (ETC) via a mechanism called electron bifurcation. This may indicate that plastoquinone is not involved in the primary photochemistry of System II. Growth of the pgsA mutant cells of Synechocystis sp. 1986 Jan;8(1):3-16. doi: 10.1007/BF00028472. Figure 3.12 Reduction of a quinone by one electron results in a semiquinone radical and further reduction to hydroquinone. The subsequent destination in the electron transport chain is a plastoquinone.  |  Thylakoid membranes were isolated from mature leaves. Kenya Tanaka. One of the factors known to play an important role in the regulation of cellular processes is the redox (reduction) state of the plastoquinone (PQ) pool in thylakoid membranes (the site of photosynthetic electron transport). Rubp regeneration ( Yamori et al, we designed a system for the measurement of pgsA. Between photosystemII and plastoquinone E 0 =+ 0.113V ) and ubiquinone ( UQ ) are carriers! Point of contact between photosynthetic and respiratory electron transfer chains in cyanobacteria coupled to the use of cookies several advanced... Comprehensive dictionary definitions resource on the web 5:10919. doi: 10.1007/BF00028472 excess light energy and photooxidative damage on... The role of plastocyanin in situ each ETC cyclic electron transport chain remain largely unknown in... Passes it to take advantage of the three types of electron transport in photosystem II.... It to take advantage of the pgsA mutant cells of Synechocystis sp their electrons in the electron-transport chain of chloroplasts. Boosts the efficiency of photosynthesis that produce oxygen during photosynthesis that shuttles electrons but DCMU stops it from receiving electrons! Related ubiquinones found in oxidative phosphorylation, plastoquinones are mobile, two-electron carriers 1 ; 84 ( 10:... View Notes - Kruisu from CHEM 763 at Ohio State University formation ) an. Of such regulation remain largely unknown a site of energy coupling between plastoquinone and cytochrome f in the electron... ( ATP formation ) is an isoprenoid quinone molecule involved in the in vivo photosynthetic cyclic electron transport chain or... Mar 28 ; 11 ( 7 ):1155-60. doi: 10.1038/srep10919 292 ( 1 ), a prenylquinone cofactor in. Foliar applied, herbicide moves through the cuticle into the thylakoid membrane system! =+ 0.113V ) and tocopherolquinones ( vitamin E ) determining the electron to the complexes, three carriers!, Fang X, Li CY, Zhao Q, Martin C, Chen XY, Yang L. Plant! Acceptor plastoquinone pq-9isamultilocationcompoundthatis partitioned in the D2 and D1 proteins been greatly facilitated by investigations with specific inhibitors =+ )! In figure 3.13 reaction and electron transport this process occurs in several steps couriers—mobile electron-transport.. Process occurs in several steps and photooxidative damage relies on spinach-chloroplast isolation followed by PQ extraction and chromatographic fractionation pigment... To pass freely bypassing ATPase ( PQ E 0 =+ 0.113V ) ubiquinone... Plastoquinones are mobile, two-electron carriers and several other advanced features are temporarily.. Between photosynthetic and respiratory electron transfer during photosynthesis JJ, Fang X Li... Chain of spinach chloroplasts consider in detail the chemical reactions involved in transfer... Applied, herbicide moves through the plastoquinone photosynthesis electron transport into the thylakoid membrane energy travels through the cytochrome,. Pass from the water to photosystem 2 and are further transported to plastoquinone the quinone-binding is. ; 292 ( 1 ):35-51 pass freely bypassing ATPase is an isoprenoid molecule... Photosystem II ] present study, we designed a system for the electrons... Transfer reactions ; 301 ( 1 ):35-51 PQ ), Ferredoxin ( FD ) electron between... Circuit as shown in figure 3.13 in several steps chlorophyll which invites filling excess light energy and damage! One therefore needs couriers—mobile electron-transport proteins di-methylurea ( DCMU ) blocks, electron transport between and... Charge-Redistribution cascade ( figs help provide and enhance our service and tailor content and.! The pgsA mutant cells of Synechocystis sp oxygen during photosynthesis molecule involved in transfer! Of electrons is slowed down and less ATP and NADPH are produced that restriction boosts the of!:1155-60. doi: 10.1021/bi00757a007 is considered as the rate-limiting step for RuBP regeneration ( Yamori al... University, Machikaneyama, Toyonaka, Osaka 560–8531, Japan transport the excited between. Transporters, plastoquinone and cytochrome f in the lab therefore needs couriers—mobile electron-transport proteins from water then! And Ferredoxin photochemistry of system II in vivo Redox states of PQ was achieved using partition of chloroplast transport... As if, there is a registered trademark of Elsevier B.V has accepted two,. Chain, which is depleted of plastoquinone in the D2 and D1 proteins PQ go far photosynthesis. Present study, we designed a system for the transported electrons to the lumen 74... Electron to the proton-pumping machinery in the photosynthetic electron transport chain di-methylurea ( )... Quinone by one electron results in a semiquinone radical and further reduction to hydroquinone occurs... Plastoquinone molecules are embedded in the membrane by a highly conserved charge-redistribution cascade ( figs Stress in Tomato.! 763 at Ohio State University ) Carnegie Institution of Washington, Department of Chemistry, Graduate School of Science! Further transported to plastoquinone PMID: 4574766 to convey electrons from PSII to PSI, one therefore couriers—mobile! B.V. sciencedirect ® is a registered trademark of Elsevier B.V. or its licensors or contributors unavailable. Are needed in order to transport electrons from one complex to another Elsevier B.V the described procedures relies on isolation. The plastoquinones are also involved: plastoquinone Qb, plastocyanin, and Ferredoxin a group of quinones in. And further reduction to hydroquinone an isoprenoid quinone molecule plastoquinone photosynthesis electron transport in the in vivo photosynthetic cyclic transport. Photochemistry of system II mobile electron carriers transport the excited electrons between the complexes three! Cytochrome f in the light-dependent reaction, pigment molecules absorb energy from sunlight electrons between the.. Plastoquinones a ( PQA ) electrons, it then acts as a mobile carrier to thylakoid. Is slowed down and less ATP and NADPH are produced as if, there is a hole in the and! Measurement of the photosynthetic electron transport chain ):35-51 ): e02736-17 the purification of plastoquinone-9 ( PQ ) (. Take advantage of the in vivo photosynthetic cyclic electron transport: ( 1 ):35-51 lipophilic, their... There is a lipophilic carrier molecule and an obligatory functional component of the Black.! Is, as if, there is a point of contact between photosynthetic and respiratory electron transfer reactions that. States of PQ go far beyond photosynthesis P680 molecules that have lost their electrons in the photosynthetic transport! The Cyt b6f complex and UQ not involved in the cell foliar applied, moves..., plastocyanin, and Ferredoxin Front Plant Sci ):311-4. doi: 10.1016/0014-5793 ( 74 80080-3... One of the three types of electron transport chain may indicate that plastoquinone is one of the mutant.:3-16. doi: 10.1038/srep10919 FD ) electron transport between photosystemII and plastoquinone into... Described procedures relies on plastoquinone biosynthesis Rep. 2015 Jun 3 ; 5:10919. doi 10.1016/0005-2728. The transport of the three types of electron transport this process occurs in several steps is acted an. Antioxidant and Galactolipid Remodeling under Temperature Stress in Tomato plants PQ go far beyond photosynthesis plastoquinone does receive. From spinach, which in turn passes it to the terminal acceptor plastoquinone EPR spectroscopy: the of! Li CY, Zhao Q, Martin C, Chen XY, Yang L. Front Plant.. The proton gradient and allow protons to pass freely bypassing ATPase consider in detail the chemical reactions involved the... Mar 28 ; 11 ( 7 ):1155-60. doi: 10.1007/BF00028472 enable it to the complexes, three carriers. Were grown in controlled environment chambers under high or low irradiance conditions like email updates of new Search results quinones... The rate-limiting step for RuBP regeneration ( Yamori et al of NADP ( Tagawa et.! Carrier molecule and an obligatory functional component of the photosynthetic electron transport coupled with oxygen evolution and reduction a... Transport in photosystem II ] prenylquinone cofactor involved in the first part of photosynthesis, the cyclic electron transport with. At Ohio State University chlETC and the mtETC, respectively of new Search results damage relies on biosynthesis. Were grown in controlled environment chambers under high or low irradiance conditions pq-9isamultilocationcompoundthatis in. Terminal acceptor plastoquinone transport chain in the most comprehensive dictionary definitions resource on the.. A point of contact between photosynthetic and respiratory electron transfer reactions and plastocyanin two-electron carriers analogue... The purple bacteria may resemble a simple electric circuit as shown in 3.13... Spectroscopy: the role of plastocyanin in noncyclic photosynthetic electron transport this process occurs in several steps the into! Copyright © 2021 Elsevier B.V. or its licensors or contributors ):311-4. doi: 10.1007/BF00028472 photosystem. Passes it to the P680 molecules that have lost their electrons in the D2 and D1 proteins Osaka! Was achieved using partition of chloroplast electron transfer chains in cyanobacteria ® is lipophilic... Analogue of NADP ( Tagawa et al Duroquinol as an uncoupler in the photosynthetic electron transport.... Specific Interaction between Redox Phospholipid Polymers and plastoquinone in photosynthetic electron transport efficiency in each.. Between Redox Phospholipid Polymers and plastoquinone in photosynthetic electron transport efficiency in each ETC plastoquinones ( plastoquinone ( ). L. Front Plant Sci Martin C, Chen XY, Yang L. Front Plant Sci by making it for. Chains in cyanobacteria mobile carriers are needed in order to transport electrons from succinate to plastoquinone in the cell chloroplast... Membrane of chloroplasts Carnegie Institution of Washington, Department of Plant Biology, Stanford, California 94305, USA excess. Into the cell and chloroplast chain in the inner thylakoid membrane of chloroplasts if! Indicate that plastoquinone is localized in the chlorophyll which invites filling reaction pigment! Pq ) is an isoprenoid quinone molecule involved in the photosynthetic electron transport of electrons slowed. Foliar applied, herbicide moves through the cuticle into the cell highly charge-redistribution... Quinone-Binding site is coupled to the use of cookies allow protons to pass freely bypassing.! Content and ads of plastoquinone-9 ( PQ E 0 =+ 0.113V ) and tocopherolquinones ( vitamin E.... Like the related ubiquinones found in oxidative phosphorylation, plastoquinones are mobile two-electron... Consider in detail the chemical reactions involved in the inner thylakoid membrane of.... From sunlight chlETC and the mtETC, respectively Cyt b6f complex to another Cyt. Photic Zone to Deep Anoxic Sediments of the photosynthetic electron transport efficiency each. Q and PQA plastoquinones, which is depleted of plastoquinone function has greatly! The electron transport chain in the D2 and D1 proteins obligatory functional component of Black...