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Determination by X-Ray Absorption of Redox Induced Structural Changes in Iron-Sulfur Cluster F_{x} in Photosystem I

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Sagi I., Bunker G., Hochman Y., Carmeli C., Zeng M. T.
Acta Physica Polonica A
|
1997
|
vol. 91
|
issue 5
871-875
EN
X-ray absorption spectra of photosystem I core protein containing F_{x}, 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 F_{x}. 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 F_{x} are interpreted to indicate structural changes of the iron-sulfur cluster in F_{x} upon reduction.
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