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Comparative quantitative analysis of phylloquinone content and photochemically competent P-700 has been performed on photosystem I particles subjected to photolysis with ultraviolet irradiation. Nonirradiated control particles exhibit a phylloquinone/P-700 stoichiometry of 1.9 +/- 0.2. Photolysis of the photosystem I particles induces a progressive depletion of phylloquinone, however, photochemistry...
The photosystem I reaction center complex of the photosynthetic prokaryote Prochloron, present as a symbiont in ascidians from the Red Sea at Eilat (Israel), was isolated and characterized. The complex consists of 4 polypeptide subunits, and therefore is similar to that of cyanophytes and green algae. Their apparent molecular masses (in kDa) are about 70 (subunit I), 16 (subunit II), 10 (subunit III),...
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