Light Harvesting in Photosynthesis
[Pages:28]Light Harvesting in Photosynthesis
Gabriela Schlau-Cohen Fleming Group
Earth is formed Life emerges Photosynthesis Cyanobacteria Oxygen-rich atmosphere Plants Dinosaurs Hominids, 3pm Homo Sapiens, 11:38 pm US 11:59:58 pm
Age of Earth 4.55 billion yrs
Prevalence of Photosynthesis
Photosynthesis 101
6CO2 + 6H2O light C6H12O6 + 6O2
Efficient: ~90% of energy absorbed is used to initiate photochemistry
Fast: Turnover rate of photosynthesis : ~ 100-300/sec
Regulated: ~75% of absorbed energy can be dissipated with a 1sec response time
Architecture of Photosynthesis is Optimized to:
Cover the solar spectrum Protect against photochemical damage
Separate energy and electron transfer
Transmit excitation to the reaction center with near unit efficiency Regulate the efficiency of light harvesting and repair damage (PSII)
Protein Complexes in the Plant
Pigment Protein Complexes
Thylakoid membrane Chloroplast
Cross-section of the leaf
Overview of
Peripheral
photosynthetic
antennas
LHCII
LHCII
supercomplex CP26
Core
in plants
CP43
CP29
Complex
CP24
D1 CP47
D2 D2
Core Complex
CP47 CP24
CP29
D1 CP43
CP26
LHCII
LHCII
Peripheral antennas
Light Harvesting Complex II (LHCII)
? >50% of plant chlorophylls in LHCII
? Functions as antenna complex
? Absorbs light energy and funnels to reaction center
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