کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
1942339 1052607 2012 22 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Light-induced quinone reduction in photosystem II
موضوعات مرتبط
علوم زیستی و بیوفناوری علوم کشاورزی و بیولوژیک دانش گیاه شناسی
پیش نمایش صفحه اول مقاله
Light-induced quinone reduction in photosystem II
چکیده انگلیسی

The photosystem II core complex is the water:plastoquinone oxidoreductase of oxygenic photosynthesis situated in the thylakoid membrane of cyanobacteria, algae and plants. It catalyzes the light-induced transfer of electrons from water to plastoquinone accompanied by the net transport of protons from the cytoplasm (stroma) to the lumen, the production of molecular oxygen and the release of plastoquinol into the membrane phase. In this review, we outline our present knowledge about the “acceptor side” of the photosystem II core complex covering the reaction center with focus on the primary (QA) and secondary (QB) quinones situated around the non-heme iron with bound (bi)carbonate and a comparison with the reaction center of purple bacteria. Related topics addressed are quinone diffusion channels for plastoquinone/plastoquinol exchange, the newly discovered third quinone QC, the relevance of lipids, the interactions of quinones with the still enigmatic cytochrome b559 and the role of QA in photoinhibition and photoprotection mechanisms. This article is part of a Special Issue entitled: Photosystem II.


► Excitation energy transfer and charge separation at the acceptor side of PSII.
► Proton-coupled electron transfer between QA and QB.
► Role of lipids in the environment of the quinone/quinol transport channels.
► Possible function of cyt b559 in quinone reduction.
► Effects of QA redox potential changes on photoinhibition.

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Biochimica et Biophysica Acta (BBA) - Bioenergetics - Volume 1817, Issue 1, January 2012, Pages 44–65
نویسندگان
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