Determination by X-Ray Absorption of Redox Induced Structural Changes in Iron-Sulfur Cluster Fx in Photosystem I |
| I. Sagi Department of Structural Biology, The Weizmann Institute of Science, Rehovot, Israel G. Bunker Department of Physics, Illinois Institute of Technology, Chicago, Illinois 60616, USA Y. Hochman, C. Carmeli and M.T. Zeng Department of Biochemistry, Tel Aviv University, Ramat Aviv, Tel Aviv 69978, Israel |
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| X-ray absorption spectra of photosystem I core protein containing Fx, the low potential iron-sulfur cluster was measured. X-ray absorption of the iron K-edge was obtained in the reduced and oxidized forms of Fx. An edge shift of 0.5 eV to lower energy and a change in the X-ray absorption near edge structure was observed. Some of the alterations in edge shape of Fx are interpreted to indicate structural changes of the iron-sulfur cluster in Fx upon reduction. |
| DOI: 10.12693/APhysPolA.91.871 PACS numbers: 78.70.Dm |