Figure 4 - full size

Figure 4.
Figure 4. Structure of SplC (red) superimposed on the V8 protease (blue). (a) An overall view of the whole model showing a high degree of structural similarity. (b) The detailed view of the active site and specificity region. The structures appear to be almost identical, except for the Tyr174–Tyr184 loop, which is β-structured in V8 while flexible in SplC. The “locked” state of the catalytic His40 is evident.