Structure, Function, and Regulation of Plant Photosystem I
The recently determined structure of plant photosystem I (PS I) provides the first relatively high-resolution structural model of a supercomplex containing a reaction center and its peripheral antenna. The peripheral antenna of PS I (LHCI) is composed of four gene products (Lhca1–4) that are unique among the chlorophyll a/b binding proteins in their pronounced long-wavelength absorbance and their assembly into dimers. We describe some of the structural features responsible for the unique properties of LHCI and its interaction with the reaction center. The possible architecture of the docking sites for plastocyanin, ferredoxin, ferredoxin:NADP+ reductase, and LHCII are discussed.
KeywordsTransmembrane Helix Detergent Concentration Electron Crystallography Peripheral Antenna Plant Photosystem
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