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Figure 3.
Figure 3. Stereo view of a superposition of the A[o]- and
A[c]-clusters. The coordination of Ni[p] in the A[o] cluster
(atoms color-coded as in Fig. 2) indicates a square planar
arrangement with three cysteine thiolates and one unidentified
exogenous ligand (L). In the A[c]-cluster (gray), the
coordination of the proximal Zn ion is distorted tetrahedral
(see also Fig. 5b). A 7  electron
density peak is found in a mF[o] - F[c] map that is 1.3 Å
removed from Ni[p] and that occupies, as shown, a position
equivalent to the Zn in the A[c]-cluster.
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