Fig. 2.
Graphic showing the most frequent POM–protein interactions. A proteolytic active POM [Ce(α-PW11O39)2]10− consisting of a strong Lewis acid metal ion, Ce(IV), connected to a Keggin structure is used as illustrative model. The Keggin structure is shown in polyhedral presentation with addenda atoms as gray polyhedra, heteroatom as yellow polyhedron, POM oxygens as small red spheres and the hydrolytically active Ce(IV) metal ion as an orange sphere. Protein main and side chains are shown as sticks (color code: carbon atoms = green, nitrogen atoms = blue, oxygen atoms = red).