Low-temperature EPR on single crystals of photosystem I: study of the iron-sulfur center FA

Klaus Brettel, Ina Sieckmann, Petra Fromme, Arthur van der Est, Dietmar Stehlik

Research output: Contribution to journalArticle

15 Scopus citations


Results of the first low-temperature EPR study of single crystals of Photosystem I from Synechococcus sp. are reported. The predominant signals in the orientation-dependent spectra are due to the photoreduced iron-sulfur-center, FA. Six magnetically inequivalent FA--centers per unit cell can be resolved. Their g-tensors and the orientation of their principal axes relative to the crystal axes are determined.

Original languageEnglish (US)
Pages (from-to)266-270
Number of pages5
JournalBBA - Bioenergetics
Issue number2
StatePublished - Jan 16 1992
Externally publishedYes



  • (Synechococcus sp.)
  • EPR
  • Iron-sulfur center
  • Photosystem I
  • Single crystal

ASJC Scopus subject areas

  • Biophysics
  • Biochemistry
  • Cell Biology

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