Primary Processes of Photosynthesis, Part 2: Principles and Apparatus
Chapter 13: Structure and Function of Photosystem I
Published:29 Nov 2007
Raimund Fromme, Ingo Grotjohann, Petra Fromme, 2007. "Structure and Function of Photosystem I", Primary Processes of Photosynthesis, Part 2: Principles and Apparatus, Gernot Renger, Gernot Renger
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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.