|
Figure 4.
Figure 4. (a) Complexation of a sulfate ion on the three-fold
axis by three Lys residues (Lys63) from the three chains of the
trimer. View is along the threefold axis. Three of the sulfate
oxygens are related by the threefold axis. The fourth, not
shown, lies on the threefold axis. (b) View of the ion-pair
network in the central channel centered on the sulfate ion. The
electron density corresponds to the final sigmaa weighted 2Fo -
Fc map, is drawn at a contour level of 1.0  and
is carved around the sulfate, Lys63, Glu59, and Arg55.
|
