Abstract
Photosystem I functions as plastocyanin: ferredoxin oxidoreductase in the thylakoid membranes of chloroplasts and cyanobacteria. It contains the photosynthetic pigments and five electron transfer centers (A0, A1, Fx, FA, and FB) that are bound to the PsaA. PsaB, and PsaC proteins. In addition, photosystem I contains at least eight other polypeptides that are accessory in their functions. Recent X-ray crystallography of photosystem I from cyanobacteria at 4 A resolution has revealed its structure and overall organization. Application of molecular genetics has now become indispensable to determine the role of individual amino acid that provide precise environment for the cofactors to function in efficient transfer of energy and electrons. In this review, we focus on the recent developments in understanding of the function, and molecular genetics of photosystem I.
Published Version
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