Lecture 9 - Reducing C requires high energy electrons H2.42...

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Reducing C requires high energy electrons: H 2 (-.42 V) NADPH (-.35 V) or reduced Ferredoxin ( -0.39 V).
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P+ NADPH
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P+ NADPH Note the two different types of oxidase: dissimilatory and assmilatory
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H + H + H + H + H + H + H + H + H + H + H + H + H + H + H + H + NADP NADPH Reverse e- flow Reverse electron flow runs an ETC in reverse: the proton gradient is used to add energy to an e-
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Photosystem I is a great source of high energy e- (PSII) (PSI) (PSI)
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Photosystem II works, but requires reverse e- flow. (PSII) (PSI) (PSI)
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What happens if you make a cyclic pathway into a linear pathway? Chl Chl Chl* NADPH CH 2 O
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This is photolithoautotrophy S 2 O 3 The electron can come from an inorganic e- donor: sulfur, H2S, Fe, As...
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photosystem II So, anything that can give electrons to photosystem II can be used for autotrophy. “Anoxygenic photosynthesis” is found in diverse members of the Bacteria.
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Water is the worst possible e- donor...unless its e- get a huge boost.
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The evolution of oxygenic photoautotrophy may have involved modification of a peroxidase into the OEC and a type I reaction center into PSI.
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