Figure 4
Anomalous differences as a function of resolution for native and four selenomethionyl mutant data sets calculated by SHELXC. The mean ratio of anomalous differences to their estimated standard deviation (d′′/σ; vertical axis) is plotted against dmin (resolution at the midpoint of the bin; horizontal axis). Except for the D626M data set, significant d′′/σ (above ∼1.3; Schneider & Sheldrick, 2002) is not present beyond ∼6 Å resolution. The Q619M and D626M data sets are two-crystal merged data sets; Q624M and L632M are single data sets. Note that the D626M data set, which displays noticeably better anomalous signal, was the only one of these data sets for which the anomalous substructure could be solved using SHELXD. |