Where Water Is Oxidized to Dioxygen: Structure of the Photosynthetic Mn <sub>4</sub> Ca Cluster
Junko Yano(Lawrence Berkeley National Laboratory), Jan Kern(Lawrence Berkeley National Laboratory), Kenneth Sauer(Lawrence Berkeley National Laboratory), Matthew J. Latimer(Lawrence Berkeley National Laboratory), Yulia Pushkar(Lawrence Berkeley National Laboratory), Jacek Biesiadka(Lawrence Berkeley National Laboratory), Bernhard Loll(Lawrence Berkeley National Laboratory), Wolfram Saenger(Lawrence Berkeley National Laboratory), Johannes Messinger(Lawrence Berkeley National Laboratory), Athina Zouni(Lawrence Berkeley National Laboratory), Vittal K. Yachandra(Lawrence Berkeley National Laboratory)
Cited by 798Open Access
Abstract
The oxidation of water to dioxygen is catalyzed within photosystem II (PSII) by a Mn(4)Ca cluster, the structure of which remains elusive. Polarized extended x-ray absorption fine structure (EXAFS) measurements on PSII single crystals constrain the Mn(4)Ca cluster geometry to a set of three similar high-resolution structures. Combining polarized EXAFS and x-ray diffraction data, the cluster was placed within PSII, taking into account the overall trend of the electron density of the metal site and the putative ligands. The structure of the cluster from the present study is unlike either the 3.0 or 3.5 angstrom-resolution x-ray structures or other previously proposed models.
Related Papers
No related papers found
Powered by citation graph analysis