    1.16.3.1 | Cd2+ |
the first cadmium ion, Cd1 is coordinated in a trigonal-bipyramidal manner, in which the triangle is formed by the side chains of His25, Asp52, and a water molecule bridging two cadmium ions, and the corner of the pyramid is formed by the side chain of Glu56 and another water molecule. The second cadmium ion, Cd2 is coordinated in a distorted octahedral manner to the side chain of His37 and three water molecules, with two sites remaining unoccupied. Zinc ions are more likely to coordinate in a tetrahedral arrangement. Cadmium ions are also more likely to coordinate in both tetrahedral and octahedral arrangements, but also exhibit a versatile coordination geometry. Cadmium ions are found to be coordinated in a trigonal-bipyramidal manner |
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