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The Composition and Organization of Photosystem I
Journal of Basic and Clinical Physiology and Pharmacology, 1991Photosystem I, extensively studied in the past decade, was shown to be homologous in all photosynthetic organisms of the higher plants type. Its core complex was found to be highly conserved through evolution from cyanobacteria to higher plants. The genes coding for the subunits of CCI were isolated and the resulting sequences provided information ...
O, Almog +3 more
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Photosystem I inhibition by polycations
Biochemical and Biophysical Research Communications, 1971Abstract Histones and other polycations inhibit the photosystem I reactions of isolated chloroplasts. Photosystem II activity is readily measured in preparations where histone has completely blocked photosystem I activity. Histone inhibition is prevented by preincubation of the chloroplasts in solutions containing salt.
J, Brand +3 more
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Interaction of ascorbate with photosystem I
Photosynthesis Research, 2014Ascorbate is one of the key participants of the antioxidant defense in plants. In this work, we have investigated the interaction of ascorbate with the chloroplast electron transport chain and isolated photosystem I (PSI), using the EPR method for monitoring the oxidized centers [Formula: see text] and ascorbate free radicals. Inhibitor analysis of the
Boris V, Trubitsin +3 more
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Structure of the plant photosystem I
Biochemical Society Transactions, 2018Plant photosystem I (PSI) is one of the most intricate membrane complexes in nature. It comprises two complexes, a reaction center and light-harvesting complex (LHC), which together form the PSI–LHC supercomplex. The crystal structure of plant PSI was solved with two distinct crystal forms. The first, crystallized at pH 6.5, exhibited P21 symmetry; the
Ido Caspy, Nathan Nelson
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Organization of Plant Photosystem II and Photosystem I Supercomplexes
2018In nature, plants are continuously exposed to varying environmental conditions. They have developed a wide range of adaptive mechanisms, which ensure their survival and maintenance of stable photosynthetic performance. Photosynthesis is delicately regulated at the level of the thylakoid membrane of chloroplasts and the regulatory mechanisms include a ...
Kouril, Roman +4 more
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Structure of cyanobacterial Photosystem I
Photosynthesis Research, 2005Photosystem I is one of the most fascinating membrane protein complexes for which a structure has been determined. It functions as a bio-solar energy converter, catalyzing one of the first steps of oxygenic photosynthesis. It captures the light of the sun by means of a large antenna system, consisting of chlorophylls and carotenoids, and transfers the ...
Ingo, Grotjohann, Petra, Fromme
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Primary photochemistry in photosystem-I
Photosynthesis Research, 1985In this review, the main research developments that have led to the current simplified picture of photosystem I are presented. This is followed by a discussion of some conflicting reports and unresolved questions in the literature. The following points are made: (1) the evidence is contradictory on whether P700, the primary donor, is a monomer or dimer
A W, Rutherford, P, Heathcote
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Mechanisms for photosystems I and II
Current Opinion in Chemical Biology, 2003Using structural information from recently published crystal structures of photosystems I and II, the processes of excitation energy transfer and electron transfer in oxygenic photosynthesis have been studied in great detail by experimental and theoretical methods.
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Measurement of stoichiometry of photosystem II to photosystem I reaction centers
Photosynthesis Research, 1989A wide range of values for the photosystem II to photosystem I stoichiometry have been reported. It is likely that some of this variation is due to measurement artifacts, which are discussed. Careful measurements of photosystem II reactions by absorption change at 325 nm, and flash yields of oxygen evolution, of protons from oxidation of water and of ...
P, Jursinic, R, Dennenberg
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Reaction center triplet states in Photosystem I and Photosystem II
Biochimica et Biophysica Acta (BBA) - Bioenergetics, 1981A photosystem I (PS I) particle has been prepared by lithium dodecyl sulfate digestion which lacks the acceptor X, and iron-sulfur centers B and A. Illumination of these particles at liquid helium temperature results in the appearance of a light-induced spin-polarized triplet signal observed by EPR.
A W, Rutherford, J E, Mullet
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