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Science 3 November 2006:
Vol. 314. no. 5800, p. 721
DOI: 10.1126/science.314.5800.721o
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Oxidation of water to O2 is catalyzed by a Mn4Ca cluster within photosystem II (PSII). Recently described crystal structures of PSII have yielded important insights, but the structure of the Mn4Ca catalytic center has remained unclear. Yano et al. (p. 821) use polarized extended x-ray absorption fine structure (EXAFS) data to provide structural models of the Mn4Ca cluster and combined information from polarized EXAFS and x-ray diffraction data to place these models within the PSII protein environment. The model which provides the best fit differs from those proposed in the x-ray structure models.




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Science. ISSN 0036-8075 (print), 1095-9203 (online)