Abstract
The crystal structure of Escherichia coli bacterioferritin has been solved to 1.9 Å, and shows the symmetrical binding of a haem molecule on the local twofold axis between subunits and a pair of metal atoms bound to each subunit at the ferroxidase centre. These metals have been identified as zinc by the analysis of the structure and X-ray data and confirmed by microfocused proton-induced X-ray emission experiments. For the first time the haem has been shown to be linked to both the internal and the external environments via a cluster of waters positioned above the haem molecule.
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Acknowledgments
We would like to thank J.E. Guy for cloning of the AKR enzyme and Inma Gomez-Morilla at the University of Surrey Ion Beam Centre for assistance with the microPIXE experiments. We would also like to thank Chirotech Technology Limited, Cambridge, UK, and the BBSRC for funding of a studentship to S.C.W. The Synchrotron Radiation Source, Daresbury, UK, is acknowledged for provision of data collection facilities on the NWSGC MAD10 beamline funded by BBSRC grants (719/B15474 and 719/REI20571) and an NWDA project award (N0002170). We thank the station scientist Mark Ellis for assistance with data collection.
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Willies, S.C., Isupov, M.N., Garman, E.F. et al. The binding of haem and zinc in the 1.9 Å X-ray structure of Escherichia coli bacterioferritin. J Biol Inorg Chem 14, 201–207 (2009). https://doi.org/10.1007/s00775-008-0438-8
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DOI: https://doi.org/10.1007/s00775-008-0438-8