Lecture#12 - Lecture 12 Oxygenic Photosynthesis Diversity of Bacterial Phototrophs Dark Reactions = Biosynthesis Read BBOM 11e Sec 17.5-17.6 13.3

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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 ½H2O => e- => e- donor PS I PS II NADP+ NADPH e- Reducing power for CO2 fixation (1) RC II absorbs photon, water is split (2) Medium-low redox potential intermediate e-donor is formed ¼O2 + 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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2 Diversity of Bacterial Phototrophs Wide distribution indicates that photosynthesis evolved very early! Bacterial Domain For more details see BBOM 11e Chapter 12 Salt-Loving Archaea Make ATP from Light Salt-Loving Archaea Make ATP from Light Halobacterium halobium Read BBOM 11e Sec. 13.3 Bacteriorhodopsin A halophilic archaeon Aerobic organotroph Low O2 => red => reddish purple High salt requirement for growth Orange-red carotenoid pigments induced by low O2 Sea salt evaporating ponds near San Francisco Halobacterium spp .
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This note was uploaded on 02/13/2008 for the course BIO 2900 taught by Professor Ghiorse during the Fall '07 term at Cornell University (Engineering School).

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Lecture#12 - Lecture 12 Oxygenic Photosynthesis Diversity of Bacterial Phototrophs Dark Reactions = Biosynthesis Read BBOM 11e Sec 17.5-17.6 13.3

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