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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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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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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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Structure and function of photosystem I
Current Opinion in Structural Biology, 1996The past year has been significant advances in the understanding of the structure and function of photosystem I (PS I). The highlights included significant progress in discovering the arrangement and function of subunits of PS I, and improvement of the structure of PS I to 4 degrees resolution, as well as new evidence for the mechanism of the ...
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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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Energy transfer between Photosystem II and Photosystem I in chloroplasts
Biochimica et Biophysica Acta (BBA) - Bioenergetics, 1975A model for the photochemical apparatus of photosynthesis is presented which accounts for the fluorescence properties of Photosystem II and Photosystem I as well as energy transfer between the two photosystems. The model was tested by measuring at - 196 degrees C fluorescence induction curves at 690 and 730 nm in the absence and presence of 5mMMgCl2 ...
W L, Butler, M, Kitajima
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Structure of Photosystems I and II
2007Photosynthesis is the major process that converts solar energy into chemical energy on Earth. Two and a half billion years ago, the ancestors of cyanobacteria were able to use water as electron source for the photosynthetic process, thereby evolving oxygen and changing the atmosphere of our planet Earth.
Petra, Fromme, Ingo, Grotjohann
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Genetic Analysis of the Form and Function of Photosystem I and Photosystem II
Annual Review of Genetics, 1995Photosystem I (PSI) and photosystem II (PSII) are two multisubunit pigment-protein complexes in the thylakoid membranes in the chloroplasts of plants, algae, and in cyanobacteria. In recent years, directed mutagenesis has been used to specifically modify individual polypeptide components of both PSI and PSII in cyanobacteria and the green alga ...
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A consideration of the organization of chloroplast photosystem I
Photosynthesis Research, 1986Procedures that allow the fractionation of a native Photosystem I complex (PSI-200) into several chlorophyll-containing complexes are now available. Two complexes, each containing ∼50% of the total chlorophyll of the photosystem, can be isolated. One complex contains both chlorophyll a and b and serves as antenna complex for the reaction center while ...
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