Calcium EXAFS establishes the Mn-Ca cluster in the oxygen-evolving complex of Photosystem II

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The proximity of Ca to the Mn cluster of the photosynthetic water-oxidation complex is demonstrated by X-ray absorption spectroscopy. We have collected EXAFS data at the Ca K-edge using active PS II membrane samples that contain approximately 2 Ca per 4 Mn. These samples are much less perturbed than previously investigated Sr-substituted samples, which were prepared subsequent to Ca depletion. The new Ca EXAFS clearly shows backscattering from Mn at 3.4 angstroms, a distance that agrees with that surmised from previously recorded Mn EXAFS. This result is also consistent with earlier related experiments at the Sr K-edge, using samples that ... continued below

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Cinco, Roehl M.; McFarlane Holman, Karen L.; Robblee, John H.; Yano, Junko; Pizarro, Shelly A.; Bellacchio, Emanuele et al. August 2, 2002.

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The proximity of Ca to the Mn cluster of the photosynthetic water-oxidation complex is demonstrated by X-ray absorption spectroscopy. We have collected EXAFS data at the Ca K-edge using active PS II membrane samples that contain approximately 2 Ca per 4 Mn. These samples are much less perturbed than previously investigated Sr-substituted samples, which were prepared subsequent to Ca depletion. The new Ca EXAFS clearly shows backscattering from Mn at 3.4 angstroms, a distance that agrees with that surmised from previously recorded Mn EXAFS. This result is also consistent with earlier related experiments at the Sr K-edge, using samples that contained functional Sr, that show Mn is {approx}; 3.5 angstroms distant from Sr. The totality of the evidence clearly advances the notion that the catalytic center of oxygen evolution is a Mn-Ca heteronuclear cluster.

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  • Journal Name: Biochemistry; Journal Volume: 41; Journal Issue: 43; Other Information: Journal Publication Date: Oct. 29, 2002

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  • Report No.: LBNL--51252
  • Grant Number: AC03-76SF00098
  • DOI: 10.1021/bi026569p | External Link
  • Office of Scientific & Technical Information Report Number: 805137
  • Archival Resource Key: ark:/67531/metadc733657

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  • August 2, 2002

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  • Oct. 18, 2015, 6:40 p.m.

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  • April 4, 2016, 12:23 p.m.

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Cinco, Roehl M.; McFarlane Holman, Karen L.; Robblee, John H.; Yano, Junko; Pizarro, Shelly A.; Bellacchio, Emanuele et al. Calcium EXAFS establishes the Mn-Ca cluster in the oxygen-evolving complex of Photosystem II, article, August 2, 2002; Berkeley, California. (digital.library.unt.edu/ark:/67531/metadc733657/: accessed September 25, 2017), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.