Abstract
Photosystem I preparations from the cyanobacterium Anabaena variabilis and from spinach were analyzed for their quinone content. The dominant quinone was identified as phylloquinone. It was present at a ratio of roughly 2 per P700 (the primary electron donor of photosystem I) both in particles prepared with Triton X-100 and on the large, P700-carrying subunit derived from these particles by treatment with SDS. The results suggest a function of phylloquinone in the reaction center.
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