Results 211 to 220 of about 30,075 (258)

Structure of the plant photosystem I

Biochemical Society Transactions, 2018
Plant 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

2018
In 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, Nosek, Lukáš, Semchonok, Dmytro, Boekema, Egbert, Ilík, Petr   +4 more
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Structure of cyanobacterial Photosystem I

Photosynthesis Research, 2005
Photosystem 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, 1985
In 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, 2003
Using 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, 1989
A 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, 1981
A 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, 1975
A 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

2007
Photosynthesis 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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Structure and function of photosystem I

Current Opinion in Structural Biology, 1996
The 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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