منابع مشابه
Photosystem II
Photosystem II is a specialized protein complex that uses light energy to oxidize water, resulting in the release of molecular oxygen into the atmosphere, and to reduce plastoquinone, which is released into the hydrophobic core of the photosynthetic membrane. All oxygenic photosynthetic organisms, which include plants, algae and some bacteria, depend on photosystem II to extract electrons from ...
متن کاملSpecific association of photosystem II and light-harvesting complex II in partially solubilized photosystem II membranes.
In this study, we report the structural characterization of photosystem II complexes obtained from partially solubilized photosystem II membranes. Direct observation by electron microscopy, within a few minutes after a mild disruption of the membranes with the detergent n-dodecyl-alpha,D-maltoside, revealed the presence of several large supramolecular complexes. Images of these complexes were s...
متن کاملPhotosystem II - mediated cyclic photophosphorylation.
DCMU-sensitive synthesis of ATP can be shown to continue in KCNtreated chloroplasts after cessation of 02 evolution. The catalyst for this reaction, k-phenylenediamine , also stimulates synthesis of ATP in NH OH-treated chloroplasts, but at much higher rates. This ATP synthesis can be o served 2 in the presence of the quinone antagonist dibromothymoquinone, and under the appropriate conditions ...
متن کاملPlants switch photosystem at high temperature to protect photosystem II
Plants are often exposed to temperatures of around 40 °C. These temperatures can cause serious damage to photosystems, yet plants can survive with minimum damage. Here, we show that plants switch photosystem to protect photosystem II (PSII) at 40 °C. Using wheat and Arabidopsis seedlings, we investigated the mechanisms of heat-derived damage in the dark and avoidance of damage in the light. Hea...
متن کاملCyanobacterial Acclimation to Photosystem I or Photosystem II Light.
The organization and function of the photochemical apparatus of Synechococcus 6301 was investigated in cells grown under yellow and red light regimes. Broadband yellow illumination is absorbed preferentially by the phycobilisome (PBS) whereas red light is absorbed primarily by the chlorophyll (Chl) pigment beds. Since PBSs are associated exclusively with photosystem II (PSII) and most of the Ch...
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ژورنال
عنوان ژورنال: Biochimica et Biophysica Acta (BBA) - Bioenergetics
سال: 2012
ISSN: 0005-2728
DOI: 10.1016/j.bbabio.2011.09.015