On the function of two vitamin K1molecules in the PS I electron acceptor complex
- 2 November 1986
- journal article
- Published by Wiley in FEBS Letters
- Vol. 208 (2) , 343-346
- https://doi.org/10.1016/0014-5793(86)81046-8
Abstract
Various PS I preparations from higher plants and cyanobacteria are found to contain vitamin K1, or phylloquinone, in a stoichiometry of 2 vitamin K1/P700. Extractions of lyophilized PS I preparations with organic solvents led to removal of one molecule of vitamin K1but conditions have not been established for the removal of the second quinone. The quinone‐depleted PS I complex ( ~ 1 vitamin K1/P700) was fully active in transferring electrons at both physiological and cryogenic temperatures, indicating one vitamin K1molecule was not required for these activities.Keywords
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