Biology 1002B Lecture Notes - Lecture 6: P700, Cyanobacteria, Carbon Fixation
1 Apr 2016
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Photosystem ii absorbs light, excites p680 to p680*, which results in oxidation of p680* to. P680+ rapidly reduced back to p680 by an electron from h 2o transferred from oxygen complex. From primary acceptor, electron is passed to mobile carrier molecule plastoquinone (pq) Pq accepts electron from photosystem ii, picks up proton from stroma. Pq diffuses through membrane before binding to cytochrome complex; donates electron and releases proton into thylakoid lumen electron then donated to plastocyanin. Photosystem i absorbs light energy, excites p700 to p700*, then oxidizes p700* to p700+ Where, when and how are o2 and nadph produced during pet? liberated electron reduces primary acceptor, before passing to ferredoxin single electron held by nadp+ reductase complex. P700+ reduced back to p700 by electron coming from plastocyanin once second electron travels along chain and reaches nadp + reductase complex, nadp+ is reduced to nadph.
