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High-Resolution Mn EXAFS of the Oxygen-Evolving Complex in Photosystem II: Structural Implications for the Mn4Ca Cluster
Open accessAbstract
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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Cited by
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Huynh, M. H. V., & Meyer, T. J. (2007) · Chemical Reviews · doi:10.1021/cr0500030 · Cited by 1,659
Ultrasmall MoOx Clusters as a Novel Cocatalyst for Photocatalytic Hydrogen Evolution
Zhang, H., Zhang, P., Qiu, M., Dong, J., Zhang, Y., & Lou, X. W. (. (2019) · Advanced Materials · doi:10.1002/adma.201804883 · Cited by 309
Ames, W., Pantazis, D. A., Krewald, V., Cox, N., Messinger, J., Lubitz, W., & Neese, F. (2011) · Journal of the American Chemical Society · doi:10.1021/ja2041805 · Cited by 289
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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
- Publisher
- American Chemical Society (ACS)
- 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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