Lecture #12 - Lecture 12 Oxygenic Photosynthesis Diversity...

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1 Lecture 12 Lecture 12 Read: BBOM 11e Sec. 17.5-17.6, 13.3, 5.15 Oxygenic Photosynthesis Diversity of Bacterial Phototrophs Dark Reactions = Biosynthesis Oxygenic Photosynthesis Diversity of Bacterial Phototrophs Dark Reactions = Biosynthesis RC I Read: BBOM 11e Sec. 17.5 ½ H 2 O => e- => e- donor PS I PS II NADP+ NADPH e- Reducing power for CO 2 fixation (1) RC II absorbs photon, water is split (2) Medium-low redox potential intermediate e-donor is formed ¼ O 2 + H+ (4) A second photon is absorbed by RC I induces more e-transport for reducing power RC II Oxygenic Photosynthesis Oxygenic Photosynthesis Non-cyclic electron flow generates ATP and NADPH 2 photosystems, 2 reaction centers (PS I, RC I / PS II, RC II) --“Z” scheme of electron flow (5 events) (5) Cyclic e- flow in PS I generates more PMF & ATP when NADPH accumulates ATP PMF (3) ETS ATP
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