Primary Processes of Photosynthesis, Part 2: Principles and Apparatus
Chapter 13: Structure and Function of Photosystem I
Published:29 Nov 2007
R. Fromme, I. Grotjohann, and P. Fromme, in Primary Processes of Photosynthesis, Part 2: Principles and Apparatus, ed. G. Renger and G. Renger, The Royal Society of Chemistry, 2007, vol. 9, ch. 13, pp. 111-146.
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Photosystem I is a large membrane protein complex that catalyzes the first step of light reactions in photosynthesis. It can be regarded as a solar energy converter that captures the light from the sun through a large core-antenna system of chlorophylls and carotenoids. It then transfers the excitation energy into the center of the complex, where this electronic energy is used to catalyze the light-driven transmembrane electron transfer from plastocyanin to ferredoxin. Photosystem I of cyanobacterial origin consists of 12 protein subunits, to which 127 cofactors are non-covalently bound. This chapter describes the structure and function of cyanobacterial Photosystem I, as revealed from the X-ray structure at 2.5 Å resolution.