FIGURE 12.

(a) The noncanonical interface in SBA showing the intersubunit salt bridges. Ten such salt bridges are formed per noncanonical interface so the tetramer has a total of 20 salt bridges. (b) Enlarged view of the area where the interactions take place, which are marked by a square frame in panel a. The salt bridges in both the frames are identical with the only difference that the chain identity of the amino acids involved is reversed; i.e., the Arg-182 shown in the enlarged version is changed to Arg'-182 in the other window. The salt bridges are shown by dashed lines. Figure was generated using ViewerLite42. All the interactions are listed in Table 3.