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Structure of cyanobacterial Photosystem I

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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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Correspondence to Petra Fromme.

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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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