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Figure 2.
Figure 2. Details of the SOR Active SiteFinal 2F[o] - F[c]
electron density map, contoured at 1.0 s, superimposed onto a
ball-and-stick representation of the active site. Center II iron
and chloride are represented as dark green and lime green
spheres, respectively. Iron coordination is shown by purple
dotted lines. The chloride anion binds tightly only in monomer
A, where Lys48 is highly ordered. In monomer B, a crystalline
contact partially disorders Lys48, thus disrupting the water
network at this location and leading to alternate positions for
the chloride ion, as suggested by an elongated electron density
(data not shown). Figures 2, 5B, 5C, 6, and 7 were prepared with
Bobscript (Esnouf, 1999) and Raster 3D (Merritt and Bacon, 1997).
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