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Results 1 - 10 of 41 > >>
EC Number Substrates Commentary Substrates Organism Products Commentary (Products) Reversibility
Show all pathways known for 1.97.1.12Display the word mapDisplay the reaction diagram Show all sequences 1.97.1.12more in the Phaeodactylum tricornutum alga, as inmost diatoms, cytochrome c6 is the only electron donor to photosystem I, and thus they lack plastocyanin as an alternative electron carrier. Analysis of electron transfer to Phaeodactylum photosystem I from several plastocyanins from cyanobacteria, green algae and plants, as compared with its own cytochrome c6, overview. Diatom photosystem I is able to effectively react with eukaryotic acidic plastocyanins, although with less efficiency than with Phaeodactylum cytochrome c6. This efficiency increases in some green alga plastocyanin mutants mimicking the electrostatics of the interaction site on the diatom cytochrome. In addition, the structure of the transient electron transfer complex between cytochrome c6 and photosystem I from Phaeodactylum is analyzed by computational docking and compared to that of green lineage and mixed systems. The Phaeodactylum system shows a lower efficiency than the green systems, both in the formation of the properly arranged [cytochrome c6-photosystem I] complex and in the electron transfer itself. Structural modeling, overview Phaeodactylum tricornutum ? - ?
Show all pathways known for 1.97.1.12Display the word mapDisplay the reaction diagram Show all sequences 1.97.1.12more in vitro plastoquinone reduction assay with the addition of ferredoxin Flaveria bidentis ? - ?
Show all pathways known for 1.97.1.12Display the word mapDisplay the reaction diagram Show all sequences 1.97.1.12more interaction analysis of photosystem I (PS I) complexes from cyanobacteria Synechocystis sp. PCC 6803 containing various quinones in the A1-site (phylloquinone PhQ in the wild-type strain and plastoquinone (PQ) or 2,3-dichloronaphthoquinone (Cl2NQ) in the menB deletion strain) and different numbers of Fe4S4 clusters (intact wild-type and ferredoxin-core complexes depleted of FA/FB centers) with external acceptors, overview. The electron transfer chain of PS I consists of the primary donor-chlorophyll (Chl) dimer P700, primary acceptor A0 (four Chl molecules), A1 (two phylloquinone molecules), and iron-sulfur clusters FX, FA, and FB.The terminal FA/FB clusters are located on the small extrinsic PsaC subunit. Electron transport in PS I occurs through both branches of the redox cofactors A and B from P700 to FX. Reaction center of PS I contains two molecules of phylloquinone (PhQ) that are characterized by extremely low midpoint redox potential Synechocystis sp. PCC 6803 ? - ?
Show all pathways known for 1.97.1.12Display the word mapDisplay the reaction diagram Show all sequences 1.97.1.12more oxygen uptake in the light is analyzed in suspensions of isolated pea thylakoids upon inhibition of electron transport from photosystem II (PS II) by diuron and delivery of electrons to photosystem I (PS I) by means of artificial donors in the presence of ascorbate, O2 reduction in PS I. 2,6-dichlorophenolindophenol (DCPIP) cannot be used as the donor for photosystem I. N,N,N',N'-tetramethyl-p-phenylene diamine (TMPD), applied as a donor, does not affect immediately the reaction of the O2 reduction, since an increase in its concentration does not lead to an increase in the oxygen uptake rate in the light. In the experiments with TMPD, an increase in light intensity leads to an increase in the oxygen uptake rate, and this fact was interpreted as a consequence of the increase in the apparent rate constant of the reaction of the O2 reduction by the components of the acceptor side of photosystem I. TMPD redox transformation consists of only one step, while the DCPIP transformation includes two steps. Ascorbate is capable of donating electrons to the primary pair of PS I cofactors, P700+. Addition of either DCPIP or TMPD at concentration of 0.05 mM to the suspension containing both DCMU and ascorbate results in the twofold increase in the rate of the O2 consumption. O2 reduction by PS I uses ascorbate alone or in combination with lipophilic compounds as immediate donor of electrons Pisum sativum ? - ?
Show all pathways known for 1.97.1.12Display the word mapDisplay the reaction diagram Show all sequences 1.97.1.12more photo-oxidation of P700 causes a broad increase in absorption in the near-infrared region due to presence of a chlorophyll cation radical (P700+) Synechocystis sp. PCC 6803 ? - ?
Show all pathways known for 1.97.1.12Display the word mapDisplay the reaction diagram Show all sequences 1.97.1.12more photo-oxidation of P700 causes a broad increase in absorption in the near-infrared region due to presence of a chlorophyll cation radical (P700+) Chlamydomonas reinhardtii ? - ?
Show all pathways known for 1.97.1.12Display the word mapDisplay the reaction diagram Show all sequences 1.97.1.12more reduction of ferredoxin by photosystem I (PSI) involves the [4Fe-4S] clusters FA and FB harbored by subunit PsaC, with FB being the direct electron transfer partner of ferredoxin. Assay in presence of 5 mM MgCl2, 30 mM NaCl and 0.03% beta-dodecyl-maltoside, with 1-2.5 mM sodium ascorbate and 0.008-0.025 mM 2,6-dichlorophenolindophenol Thermosynechococcus vestitus ? - ?
Show all pathways known for 1.97.1.12Display the word mapDisplay the reaction diagram Show all sequences 1.97.1.12more reduction of ferredoxin by photosystem I (PSI) involves the [4Fe-4S] clusters FA and FB harbored by subunit PsaC, with FB being the direct electron transfer partner of ferredoxin. Assay in presence of 5 mM MgCl2, 30 mM NaCl and 0.03% beta-dodecyl-maltoside, with 1-2.5 mM sodium ascorbate and 0.008-0.025 mM 2,6-dichlorophenolindophenol Synechocystis sp. PCC 6803 ? - ?
Show all pathways known for 1.97.1.12Display the word mapDisplay the reaction diagram Show all sequences 1.97.1.12more thylakoids freshly isolated from spinach are assayed for their ability to generate a light driven proton gradient. While high rates of cyclic electron flow are observed in vivo, isolated thylakoids show only very slow rates, suggesting that the activity of a key complex is lost or downregulated upon isolation. Isolation of thylakoids in the complete absence of DTTRED leads to loss of CEF activity that is only partially restored by subsequent addition of 2 mM DTTRED, redox titration of CEF activity, overview Spinacia oleracea ? - ?
Show all pathways known for 1.97.1.12Display the word mapDisplay the reaction diagram Show all sequences 1.97.1.12more upon light excitation, the excited singlet state of the primary electron donor, P700 delivers an electron to the primary Chl acceptor A0A/ A0B forming the charge-separated state P700 +A0-. The electron is then transferred in sequence to A1A/ A1B, to the iron-sulfur cluster FX, and ultimately to FA/FB. The side production of superoxide radical in the A1-site by oxygen reduction via the Mehler reaction might comprise about 0.3% of the total electron flow in photosystem I, PS I. Interaction of PS I with external acceptors, methylviologen, 2,3-dichloro-naphthoquinone and oxygen, overview. Analysis of PS I complexes containing various quinones in the A1-binding site, i.e. phylloquinone PhQ, plastoquinone-9 PQ and 2,3-dichloro-naphthoquinone, as well as FX-core complexes, depleted of terminal iron-sulfur FA/FB clusters Synechocystis sp. PCC 6803 ? - ?
Results 1 - 10 of 41 > >>