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Figure 2
A tentative atomic resolution model of the structure of the Mn complex in the S1 state (Haumann et al., 2001BB22). Top, viewed from lumen along the membrane normal; bottom, turned by 90° around the long axis. All of the manganese ligands (presumably five or six per manganese ion) are not shown; rather, the four Mn atoms, the bridging μ-oxo atoms and one Ca are depicted. The boundary of the electron density (solid line) was taken from Zouni et al. (2001BB64). The Mn atoms separated by 3.1 Å are, presumably, bridged by a further mono-μ-oxo bridge. In the top scheme, some of the distances determined by EXAFS spectroscopy are given in Å; in the bottom scheme, the angles between absorber–backscatter vectors and the membrane normal are indicated. The position of the Ca ion is still highly speculative.

Journal logoJOURNAL OF
SYNCHROTRON
RADIATION
ISSN: 1600-5775
Volume 10| Part 1| December 2003| Pages 76-85
doi:10.1107/S090904950201720X
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