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On the function of two vitamin K1molecules in the PS I electron acceptor complex

Authors
Journal
FEBS Letters
0014-5793
Publisher
Wiley Blackwell (John Wiley & Sons)
Publication Date
Volume
208
Issue
2
Identifiers
DOI: 10.1016/0014-5793(86)81046-8
Keywords
  • Phylloquinonefe-S Centerp700Photosystem I
Disciplines
  • Biology

Abstract

Abstract Various PS I preparations from higher plants and cyanobacteria are found to contain vitamin K 1, or phylloquinone, in a stoichiometry of 2 vitamin K 1/P700. Extractions of lyophilized PS I preparations with organic solvents led to removal of one molecule of vitamin K 1 but conditions have not been established for the removal of the second quinone. The quinone-depleted PS I complex ( ~ 1 vitamin K 1/P700) was fully active in transferring electrons at both physiological and cryogenic temperatures, indicating one vitamin K 1 molecule was not required for these activities.

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