Abstract
Photosystem I is one of the most fascinating membrane protein complexes for which a structure has been determined. It functions as a bio-solar energy converter, catalyzing one of the first steps of oxygenic photosynthesis. It captures the light of the sun by means of a large antenna system, consisting of chlorophylls and carotenoids, and transfers the energy to the center of the complex, driving the transmembrane electron transfer from plastoquinone to ferredoxin. Cyanobacterial Photosystem I is a trimer consisting of 36 proteins to which 381 cofactors are non-covalently attached. This review discusses the complex function of Photosystem I based on the structure of the complex at 2.5 Å resolution as well as spectroscopic and biochemical data.
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Abbreviations
- Car:
-
carotenoid
- Chl:
-
chlorophyll
- ETC:
-
electron transport chain
- EPR:
-
electron paramagnetic resonance
- FeS:
-
iron–sulfur cluster
- MGDG:
-
monogalactosyldiacylglycerol
- PG:
-
phosphatidylglycerol
- PS I:
-
Photosystem I
- PS II:
-
Photosystem II
- TS elongatus :
-
Thermosynechococcus elongatus
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Grotjohann, I., Fromme, P. Structure of cyanobacterial Photosystem I. Photosynth Res 85, 51–72 (2005). https://doi.org/10.1007/s11120-005-1440-4
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DOI: https://doi.org/10.1007/s11120-005-1440-4