Screening of novel chemical compounds as possible inhibitors of carbonic anhydrase and photosynthetic activity of photosystem II

2014 ◽  
Vol 137 ◽  
pp. 156-167 ◽  
Author(s):  
Mehmet Sayım Karacan ◽  
Sergei K. Zharmukhamedov ◽  
Serhat Mamaş ◽  
Elena V. Kupriyanova ◽  
Alexandr V. Shitov ◽  
...  
Keyword(s):  
Photosystem Ii ◽  
Carbonic Anhydrase ◽  
Photosynthetic Activity ◽  
Chemical Compounds

Evaluation of new Cu(II) complexes as a novel class of inhibitors against plant carbonic anhydrase, glutathione reductase, and photosynthetic activity in photosystem II

2017 ◽  
Vol 133 (1-3) ◽  
pp. 139-153 ◽  
Author(s):  
Margarita V. Rodionova ◽  
Sergei K. Zharmukhamedov ◽  
Mehmet Sayım Karacan ◽  
Kubra Begum Venedik ◽  
Alexandr V. Shitov ◽  
...  
Keyword(s):  
Photosystem Ii ◽  
Carbonic Anhydrase ◽  
Glutathione Reductase ◽  
Photosynthetic Activity

The Three-Dimensional Structure of the Herbicide Binding Niche on the Reaction Center Polypeptides of Photosystem II

1987 ◽  
Vol 42 (6) ◽  
pp. 742-750 ◽  
Author(s):  
Achim Trebst
Keyword(s):  
Amino Acid ◽  
Photosystem Ii ◽  
Reaction Center ◽  
Three Dimensional ◽  
Chemical Compounds ◽  
Dimensional Structure ◽  
Bacterial Reaction Center ◽  
Protein Subunits ◽  
Herbicide Binding ◽  
Hydropathy Analysis

The folding through the membrane of the plastoquinone and herbicide binding protein subunits of photosystem II and the topology of the binding niche for plastoquinone and herbicides is described. The model is based on the homology in amino acid sequence and folding prediction from the hydropathy analysis of the D-1 and D-2 subunits of photosystem II to the reaction center polypeptides L and M of the bacterial reaction center. It incorporates the amino acid changes in the D-1 polypeptide in herbicide tolerant plants and those indicated by chemical tagging to be involved in Qв binding. It proposes homologous amino acids in the D-1/D-2 polypeptides to those indicated by the X-ray structure of the bacterial reaction center to be involved in Fe-, quinone- and reaction center chlorophyll-binding. The different chemical compounds known to interfere with Qв function are grouped into two families depending on their orientation in the Qв binding niche.

Differences in photosynthetic activity between coral sections infested and not infested by boring spionid polychaetes

2006 ◽  
Vol 86 (4) ◽  
pp. 727-728 ◽  
Author(s):  
Jeffrey Wielgus ◽  
Oren Levy
Keyword(s):  
Photosystem Ii ◽  
Cross Section ◽  
Absorption Cross Section ◽  
Repetition Rate ◽  
Photosynthetic Activity ◽  
Mean Value ◽  
Absorption Cross ◽  
Physiological Mechanisms ◽  
Coral Colony ◽  
The Mean

A SCUBA-based fast repetition rate fluorometer (FRRF) was used to study differences in the functional absorption cross-section of Photosystem II (σPSII) between areas of a coral colony of Astreoporamyriophthalma that were infested with spionid polychaetes vs areas lacking worms. The mean value of σPSII in infested areas (mean±SD=347.62±30.67 Å2) was significantly higher than in the areas that were not infested (316.32±17.49 Å2; P<0.0001). Several physiological mechanisms are discussed that may contribute to the observed differences.

scholarly journals Photosystem II core quenching in desiccated Leptolyngbya ohadii

2019 ◽  
Vol 143 (1) ◽  
pp. 13-18 ◽  
Author(s):  
Reza Ranjbar Choubeh ◽  
Leeat Bar-Eyal ◽  
Yossi Paltiel ◽  
Nir Keren ◽  
Paul C. Struik ◽  
...  
Keyword(s):  
Photosystem Ii ◽  
Light Intensity ◽  
Photosynthetic Activity ◽  
High Light Intensity ◽  
Primary Electron ◽  
High Light ◽  
Harsh Environment ◽  
Primary Electron Donor ◽  
Protection Mechanism ◽  
The Core

Abstract Cyanobacteria living in the harsh environment of the desert have to protect themselves against high light intensity and prevent photodamage. These cyanobacteria are in a desiccated state during the largest part of the day when both temperature and light intensity are high. In the desiccated state, their photosynthetic activity is stopped, whereas upon rehydration the ability to perform photosynthesis is regained. Earlier reports indicate that light-induced excitations in Leptolyngbya ohadii are heavily quenched in the desiccated state, because of a loss of structural order of the light-harvesting phycobilisome structures (Bar Eyal et al. in Proc Natl Acad Sci 114:9481, 2017) and via the stably oxidized primary electron donor in photosystem I, namely P700+ (Bar Eyal et al. in Biochim Biophys Acta Bioenergy 1847:1267–1273, 2015). In this study, we use picosecond fluorescence experiments to demonstrate that a third protection mechanism exists, in which the core of photosystem II is quenched independently.

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