Fig. 4.

Increased AlfA interstrand contacts compensate for missing subdomain IIb interactions. (A) Three protomers from single strands of AlfA and three other actins are shown, with the central protomer colored as in Fig. 1. Residues involved in cross-strand interaction surfaces are colored yellow. (B) Single protomers with residues involved in longitudinal interacting surfaces colored yellow. The size of each interface is given as both absolute area per protomer and as a fraction of the total surface area of the protomer.