CHEM 4041 Lecture Notes - Lecture 13: Ferredoxin, Dcmu, Electrochemical Gradient
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March 1, 2016: special pair: absorbs light at 680nm (called p680, manganese center: site of o2 evolution; many oxidation levels (2+, 3+, 4+, 5+) Figure 19. 14: chlorophyll a absorbs at 680nm: p680 rapidly transfers an e- to pheophytin, qa is tight bound, qb is mobile. Some herbicides bind to qb and inactivate it: diuron and atrazine: the positive charge on p680 is neutralized by w- ow from h2o bound at mn center. Reducing agent is h2o and o2 is a byproduct. Clicker: which of the following, which in a proper protein environment, is a strong oxidant that can extract e- from h2o: manganese. Direction of proton gradient: ps ii releases h+ into the thylakoid lumen (excess of h+ in the lumen; lower ph) Final stage of light reactions in catalyzed by psi: special pair absorbs maximally at. 700nm and the center is called p700: non-heme center. It requires fad as a prosthetic group in ferredoxin-nadp+ reductase.