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| site of light photosynthesis. has 4 e- transport complexes. uses NADP as a terminal e- acceptor. |
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2 H2O + 2 NADP+ → O2 + 2 NADPH + 2H+ ΔGo’= +440 kJ/mol
Electrons are moving from +Eo’ to –Eo’.
energy is needed to make this favorable.
light energy excites the electron in P680 (PS2) and this electron is transferred to P700 (PS1). another photon excited the e- again and this goes into the Calvin Cycle |
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Term
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Definition
cyclic tetrapyrrole similar to heme
co-ordinated Mg atom
Light in wavelength range of 680 to 700 nm is effective in triggering light reactions |
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Accessory chlorophylls and carotenoids absorb photons and pass this energy to the reaction center via resonance
Reaction center is a special pair of chlorophyll molecules bound to a pair of protein subunits |
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| PSII, Cyto bf, PSI and ferredoxin-NADP+ reductase |
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| 3 intermediate e- carriers |
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Definition
| Plastoquinone (PQ), plastocyanin (Pc), and Ferredoxin (Fd) |
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Highly similar to ubiquinone in oxidative phosphorylation
Carries 2e-/mole from PSII to cyto bf |
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Monomeric peripheral membrane protein on thylakoid space (lumen) side of membrane
Contains single Cu atom that carries 1 e-
Carries electrons from Cyto bf to PSI |
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Definition
Monomeric peripheral membrane protein on stromal side of membrane
Contains Iron-sulfur cluster (2Fe2S)
Carries electrons from PSI to Fd-NADP+ reductase |
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