Figure 2.
Fig. 2. Electron density maps and ribbon models of
nucleotide-binding sites in the two ncs subunits. Possible
residues that interact with nucleotides are depicted: Y14, I15,
Y168, R179, and D180 are in contact with the adenine bases; K51
and T52 (Walker A), D97 (Walker B), T146 (Sensor I), and R205
(Sensor II) may interact with the phosphate groups. The stick
models of (a) AMPPNP and (b) ADP were represented with
corresponding simulated annealed F[o] F[c] omit
maps at a 1.5 contour.
The nucleotide atoms were omitted from the map calculation.
Ribbons corresponding to the two sensor motifs and the two
Walker motifs are indicated by the same color as in Fig. 1c. (c)
Structural differences between the "A" (blue) and "B" (yellow)
forms. Here, only the C backbones
of domain N (ATPase domain) were superimposed between the two
ncs molecules.
F[c] omit
maps at a 1.5 
contour.
The nucleotide atoms were omitted from the map calculation.
Ribbons corresponding to the two sensor motifs and the two
Walker motifs are indicated by the same color as in Fig. 1c. (c)
Structural differences between the "A" (blue) and "B" (yellow)
forms. Here, only the C 
backbones
of domain N (ATPase domain) were superimposed between the two
ncs molecules.