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High-Resolution Mn EXAFS of the Oxygen-Evolving Complex in Photosystem II: Structural Implications for the Mn4Ca Cluster

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Yano, Junko, Pushkar, Yulia, Glatzel, Pieter, Lewis, Azul, Sauer, Kenneth, Messinger, Johannes, Bergmann, Uwe, Yachandra, Vittal·2005·Journal of the American Chemical Society

Abstract

The biological generation of oxygen by the oxygen-evolving complex in photosystem II (PS II) is one of nature's most important reactions. The recent X-ray crystal structures, while limited by resolutions of 3.2-3.5 A, have located the electron density associated with the Mn4Ca cluster within the multiprotein PS II complex. Detailed structures critically depend on input from spectroscopic techniques, such as EXAFS and EPR/ENDOR, as the XRD resolution does not allow for accurate determination of the position of Mn/Ca or the bridging and terminal ligand atoms. The number and distances of Mn-Mn/Ca/ligand interactions determined from EXAFS provide important constraints for the structure of the Mn4Ca cluster. Here, we present data from a high-resolution EXAFS method using a novel multicrystal monochromator that show three short Mn-Mn distances between 2.7 and 2.8 A and, hence, the presence of three di-mu-oxo-bridged units in the Mn4Ca cluster. This result imposes clear limitations on the proposed structures based on spectroscopic and diffraction data and provides input for refining such structures.

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Metadata

Authors
Yano, J., Pushkar, Y., Glatzel, P., Lewis, A., Sauer, K., Messinger, J., Bergmann, U., & Yachandra, V.
Venue
Journal of the American Chemical Society
Published
2005-10-06
Volume
127
Issue
43
Pages
14974-14975
ISSN
  • 0002-7863 (ISSN-L)
  • 1520-5126
OpenAlex
W2081358286
Cited by
200
References
0
FWCI
4.61
Type
journal article
Language
en
Open access
green

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CoChat. (2026). Citation check: High-Resolution Mn EXAFS of the Oxygen-Evolving Complex in Photosystem II: Structural Implications for the Mn4Ca Cluster. https://app.cochat.ai/papers/10.1021/ja054873a
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Yano, J., Pushkar, Y., Glatzel, P., Lewis, A., Sauer, K., Messinger, J., Bergmann, U., & Yachandra, V. (2005). High-Resolution Mn EXAFS of the Oxygen-Evolving Complex in Photosystem II: Structural Implications for the Mn4Ca Cluster. Journal of the American Chemical Society. https://doi.org/10.1021/ja054873a

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