Synthesis and Assembly of the Polypeptide Subunits of Photosystem I
This extract was created in the absence of an abstract.
Excerpt
The chloroplast inner membrane contains four major protein complexes: photosystem I (PS I), photosystem II (PS II), a cytochrome complex, and an ATPase. These units of function cooperate to convert photon energy into reducing power (NADPH) and chemical-bond energy (ATP). Each complex consists of 4 to 16 polypeptides that carry out a number of coordinated functions. For example, PS I contains polypeptides that bind chlorophyll, harvest light energy, and transfer the absorbed photon energy to the reaction center; a reaction-center chlorophyll-protein that mediates charge separation; two iron-sulfur proteins that serve as electron acceptors; and polypeptides that mediate the binding of ferredoxin and ferredoxin-NADP oxi-doreductase to PS I (Mullet et al. 1980).
Information coding for the polypeptides of the thylakoid-membrane complexes is located on nuclear and chloroplast DNAs (cf. Kirk and Tilney-Basset 1967). For ATPase, the genes for three subunits are located in the nucleus and the RNA is translated on...
