Structure Analysis of Single Crystals of Photosystem I by X-Ray, EPR and ENDOR: A Short Status Report

  • H. T. Witt
Part of the Advances in Photosynthesis and Respiration book series (AIPH, volume 4)


Photosystem I purified from the thermophilic cyanobacterium Synechococcus elongatus has been crystallized. The first structural model for this reaction center was based on an electron density map at 6 Å resolution. Now, with improved crystals, a new data collection at higher structural resolution is available. This status report outlines some results on the present state of X-ray structure analysis of Photosystem I at 4.5 Å resolution. Single crystals of Photosystem I have also been analyzed by magnetic resonance spectroscopy (EPR and ENDOR). The results, presented here, provide new information on the structure of the primary electron donor (P700) and on the structures of the terminal electron acceptors, the iron-sulfur clusters FA and FB.


Hyperfine Coupling Photosynthetic Reaction Center ENDOR Spectrum Primary Electron Donor Lumenal Side 
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Copyright information

© Kluwer Academic Publishers 1996

Authors and Affiliations

  • H. T. Witt
    • 1
  1. 1.Max-Volmer-Institut für Biophysikalische und Physikalische ChemieTechnische Universität BerlinBerlinGermany

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