Figure 3 Backbone variation in ensemble refinements of PDB entry 7k3t with different underlying disorder models. An equivalent figure with side chains
is shown in Supplementary Fig. S12. Structures shown are as in Table 4 . Rows are labelled with the disorder model used. Column 1: the input disorder for
the ECHT disorder models. Column 2: the output ensemble in the area surrounding the
active site (the catalytic His residue is indicated), including the p2 helix and the
p5 loop. Column 3: the disorder in the p2 helix systematically decreases as more disorder
is added to the underlying disorder model, but the ensembles are all qualitatively
similar, confirming that the helix, although flexible, adopts only one distinct conformation.
Column 4: the pTLS model suppresses disorder at the top of the p5 loop. Different
ECHT disorder models systematically increase disorder in the B factors and correspondingly decrease disorder in the obtained ensemble. The ECHT
level 1 ensemble is the most physically interpretable ensemble, since this contains
all of the disorder in the ensemble apart from collective molecular motions. In the
ECHT level 1+2 ensemble and the ECHT level 1+2+3 ensemble some of this disorder is
now hidden in the B factors, and only the complex residue motions remain. |