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Figure 4.
Figure 4. Stereo view of electron density around the active
site of Bst-RNase HIII. The structures of (a) metal-free, ((b)
and (d)) Mn2+-bound, and (c) Mg2+-bound proteins are shown. In
(a), (b), and (c), the 2F[o] -F[c] map contoured at the 1.0s
level is shown. In (d), the 2F[o] -F[c] map and the anomalous
difference map contoured at the 4.5s and 3.5s levels are shown
in blue and magenta, respectively. The red and yellow crosses
indicate the water molecule and metal ion, respectively.
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