Results 161 to 170 of about 5,741,545 (200)

Carotenoid Photooxidation in Photosystem II

Archives of Biochemistry and Biophysics, 2001
Carotenoids are known to function as light-harvesting pigments and they play important roles in photoprotection in both plant and bacterial photosynthesis. These functions are also important for carotenoids in photosystem II. In addition, beta-carotene recently has been found to function as a redox intermediate in an alternate pathway of electron ...
C A, Tracewell, J S, Vrettos, J A, Bautista, H A, Frank, G W, Brudvig   +4 more
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Photoinhibition of Photosystem II

2013
Photoinhibition of Photosystem II (PSII) is the light-induced loss of PSII electron-transfer activity. Although photoinhibition has been studied for a long time, there is no consensus about its mechanism. On one hand, production of singlet oxygen ((1)O(2)) by PSII has promoted models in which this reactive oxygen species (ROS) is considered to act as ...
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The nonheme iron in photosystem II

Photosynthesis Research, 2013
Photosystem II (PSII), the light-driven water:plastoquinone (PQ) oxidoreductase of oxygenic photosynthesis, contains a nonheme iron (NHI) at its electron acceptor side. The NHI is situated between the two PQs QA and QB that serve as one-electron transmitter and substrate of the reductase part of PSII, respectively. Among the ligands of the NHI is a (bi)
Frank, Müh, Athina, Zouni
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Trypsin inhibition of Photosystem II

Biochimica et Biophysica Acta (BBA) - Bioenergetics, 1971
Abstract 1. Brief incubation of chloroplasts with trypsin accelerated (by uncoupling) while longer incubation inhibited the Hill reaction with 2,6-dichlorophenolindophenol (DCIP). When an uncoupler (NH 4 Cl or methylamine · HCl) was present, or when the reaction was light-limited, even brief incubation with trypsin inhibited the reaction.
B R, Selman, T T, Bannister
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The lipoproteins of cyanobacterial photosystem II

Journal of Photochemistry and Photobiology B: Biology, 2011
Photosystem II (PSII) complexes from cyanobacteria and plants perform water splitting and plastoquinone reduction and yet have a different complement of lumenal extrinsic proteins. Whereas PSII from all organisms has the PsbO extrinsic protein, crystal structures of PSII from cyanobacteria have PsbV and PsbU while green algae and higher plants instead ...
Robert D, Fagerlund, Julian J, Eaton-Rye
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Photosystem II: the engine of life

Quarterly Reviews of Biophysics, 2003
1. Introduction 712. Electron transfer in PS II 723. (Mn)4cluster and mechanism of water oxidation 734. Organization and structure of the protein subunits 755. Organization of chlorophylls and redox active cofactors 816. Implications arising from the structural models 827. Perspectives 848. Acknowledgements 869. Addendum 8610.
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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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Heterogeneity in chloroplast photosystem II

Photosynthesis Research, 1986
Photosystem-two (PSII) in the chloroplasts of higher plants and green algae is not homogeneous. A review of PSII heterogeneity is presented and a model is proposed which is consistent with much of the data presented in the literature. It is proposed that the non-quinone electron acceptor of PSII is preferentially associated with the sub-population of ...
M T, Black, T H, Brearley, P, Horton
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Copper in photosystem II: association with LHC II

Photosynthesis Research, 1987
Photosystem II particles from spinach and barley contained 2.5 and 4.2 Cu per 300 chlorophylls respectively. This Cu was resistant to removal by EDTA. A large percentage of the PSII Cu in both plants is associated with the light-harvesting chlorophyll a/b protein, LHCII; 46% in barley and 76% in spinach.
P R, Sibbald, B R, Green
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On the dimerization of chlorophyll in photosystem II

Physical Chemistry Chemical Physics, 2011
In photosystem II, absorbed light energy is transferred to a reaction centre consisting of chlorophyll units. Release of an electron from the reaction centre is the starting point for the charge separation and electron transport chain in PSII. Crystal structures of the reaction centre have identified two chlorophyll monomers forming a dimer with a ...
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