Photosystem II (Redox Cofactors) - Edubirdie

University:
The University Of Western Ontario
Course:
Biology 3660B | Advanced Plant Physiology
Academic year:

2023
Views:

215

Pages:

2
Author:

Kyuwon J.

Light absorption and excitation ● LHCb 1+2+3 ,and LHCb 4+5+6 ○ Light harvesting antennas ○ Absorbs photons and transmits it to PS2 ● P680 ○ Reaction center ○ Photon absorption ○ Chlorophyll becomes excited Electron transport in PS2 ● Water oxidation ○ Split water on OEC ■ Produce 4H+ O2 and e■ Electrons flow through… 1. P680 2. Pheo 3. QA 4. QB 5. PQ ● Reduced PQ is sent to cytochrome b6f complex for electron transfer LHCb is different form carotenoids ● Binds to carotenoids insteads with chlorophyll a and b ○ Chlorophyll a ■ Absorbed red blue violet ○ Chlorophyll b ■ Absorbs blue orange ○ Carotenoids ■ Broadens absorption ■ Defend against photooxidative damages If too much light ● ROS may form ○ Must be dissipated by heath through xanthophyll cycle ○ Heat release Photochemistry: use of photon energy for driving electron transport and producing ATP/NADPH

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