Protonated waters in 5MOP
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I really like this structure as the waters are protonated.
In the neutron structure PDB:5MOP (deuterated) waters are visible. Solubility and the state of water is incredibly hard to predict and classical mechanical models do not account for ionisation of the waters, consequently it is fascinating to see hydronium and hydroxide ions.
NB. that some disordered hydrogens are missing, hence the occasional external hydroxide or lone atomic oxygens.
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