EXAFS Structural Study of FX, the Low-Potential Fe-S Center in Photosystem I

Ann E. McDermott, Vittal K. Yachandra, Ronald D. Guiles, Kenneth Sauer, Melvin P. Klein, Kevin G. Parrett, John H. Golbeck

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Abstract

We present iron extended X-ray absorption fine structure (EXAFS) spectra of a photosystem I core preparation containing FX, the very low potential iron–sulfur cluster in photosystem I. The preparation lacks FA and FB. The amplitude of Fe–Fe backscattering in the EXAFS spectrum indicates that FX may be a [4Fe-4S] cluster and is not a [2Fe-2S] cluster or clusters.

Original languageEnglish (US)
Pages (from-to)8056-8059
Number of pages4
JournalBiochemistry
Volume28
Issue number20
DOIs
StatePublished - Jan 1 1989

All Science Journal Classification (ASJC) codes

  • Biochemistry

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    McDermott, A. E., Yachandra, V. K., Guiles, R. D., Sauer, K., Klein, M. P., Parrett, K. G., & Golbeck, J. H. (1989). EXAFS Structural Study of FX, the Low-Potential Fe-S Center in Photosystem I. Biochemistry, 28(20), 8056-8059. https://doi.org/10.1021/bi00446a013