Lecture 11 - 012811

Lecture 11 - 012811 - Lecture 11 Chloroplast and...

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0 Lecture 11 Chloroplast and Photosynthesis (II)
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1 Summary: Z scheme of photosynthesis
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2
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3 Andre Jagendorf’s demonstration
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4 ATP formation is driven by a proton-motive force ¾ Thylakoid membrane is permeable to Cl - and Mg 2+ ¾ Electrical neutrality is maintained ¾ [H + ] has a major contribution to proton-motive force ¾ pH difference = 3.5 => proton-motive force=0.20V or Δ G=-20.0 kJ/mol (how to calculate?)
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5 Cyclic photophosphorylation ¾ When NADPH/NADP + is high, not enough NADP + to accept e - ¾ Only PSI involved
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6 Cyclic photophosphorylation ¾ No NADPH is generated ¾ Proton gradient => ATP synthesis ¾ No O 2 is formed
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7 Electrons from PSII to PSI: both need light Stroma e Thylakoid Lumen How much is sunshine worth? 12 H + 12 H + 3 ATP
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8 Electrons come from H 2 O And H + pumped Stroma Split Water Pump H + Thylakoid Lumen 12 H + 12 H + 3 ATP
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9 Protons drive ATP Synthase Stroma Proton gradient drives ATP synthase Thylakoid Lumen 12 H + 12 H + 3 ATP
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10 How much is sunshine worth?
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