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Emerson:
Far-red light alone is insufficient in driving photosynthesis
> 680 nmAccessory pigments
Red drop effect Enhancement effect
Two photochemical complexes
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Z scheme
distinct antenna pigments and photochemical reaction center
NADH structure
96T oral exam
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Yz: a tyrosine residue of D1Pheophytin (Pheo)
Plastoquinones (QA and QB)
Cytochrome b6f complexPlastocyanin (PC): a soluble Cu protein
A0: a chlorophyll
A1: a quinone
Membrane bound Fe-S proteins
Fd: a soluble ferredoxin
FNR: soluble ferredoxin-NADP reductase
cyclic e- flowATP synthesis,no NADPH formation
p.140
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Chloroplast: contains its own DNA, RNA, and ribosomes
Essay 7.1 (2006)A Novel View of Chloroplast Structure: dynamic
5 m
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Trends in Plant Science (02) 7: 183
2 NADPH, 3 ATP / 8 photons
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Light absorption vs. photoinduced charge separation
Stryer
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heat releaseheat release
excited e- is transferred to a secondary acceptor
re-reduced by a secondary donor
Photon → e- rearrangement in the reaction center → e- transfer
photon energy → redox (e-) energy
A very rapid series of charge separation
→ capture light energy
Reaction center chlorophyll