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Figure 2.
FIGURE 2. Stereo view of nitrite bound to the type 2 copper
ion in RsNiR. a, at pH 6.0 showing full occupancy and with 2F[o]
- F[c] electron density contoured at  level 1.0. b, at pH 8.4
with half-occupancy and with 2F[o] - F[c] electron density
contoured at level 0.9. The
flexibility of His-287 at pH 8.4 can be seen as a rotation of
the imidazole ring (b).
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