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330JP16 - BISC 330L Dr John Petruska 330JP16 Lect 15 Review...

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BISC 330L Dr. John Petruska 330JP16.ppt Lect. 15 Review: Electron Carriers & Proton Pumps and Lecture 16 Photosynth: PSI, Ferredoxin & NADPH Prod. References: Garrett & Grisham, Biochemistry (3rd Ed 2005), Chap. 21 Berg, Tymocko & Stryer, Biochemistry (6th Ed 2007), Chap. 19
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Fig. 21.20 Mechanism of photophosphorylation. Proton pumping by PSII/Cytbf/PSI, driven by light absorbed in PSII and PSI, concentrates H + in lumen (pH 4-5) to enable ATP synthesis (from ADP + Pi + H + ) by CF 1 CF 0 ATP synthase. PSII Cytbf PSI
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Photosystem II (PS II) components: D 1 , D 2 = Reaction center 32 Kd protein subunits CP43,CP47= Chlorophyll (Chl) antenna subunits P680 = Special Chl a pair at D 1 / D 2 interface Phe or Pheo = Pheophytin (Chl a without Mg ++ ) On stroma side: Q A = Quinone (Q) site in D 2 Q B = Quinone (Q) site in D 1 PQ = plastoquinone in lipid bilayer On lumen side: (Mn) 4 = Manganese (Mn +2 ) complex
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Fig. 21.18 Molecular Architecture of PSII, with arrows showing electron path when light is absorbed by P680 (P D1 P D2 ).
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CP47 CP43 Stryer Fig. 19.13 Structure of Photosystem II (P680)
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PSII:
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