A joint X-ray/neutron diffraction study has enabled the direct observation of a hydronium ion coordinated by three amino-acid residues of an enzyme. This sighting will affect our views on how enzymes transport and use protons.
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Davidson, V. The many faces of a proton. Nature Chem 3, 662–663 (2011). https://doi.org/10.1038/nchem.1122
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DOI: https://doi.org/10.1038/nchem.1122
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