EXAFS structural study of FX, the low-potential Fe-S center in photosystem I |
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| Authors: | A E McDermott V K Yachandra R D Guiles K Sauer M P Klein K G Parrett J H Golbeck |
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| Institution: | Laboratory of Chemical Biodynamics, Lawrence Berkeley Laboratory, University of California, Berkeley 94720. |
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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. |
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