FIGURE 5.
Head-to-tail overlap complexes. A, head-to-tail overlap complex formed between dimers 1 and 2 in the structure of sm-Tmα81. B, head-to-tail overlap complex formed between dimes 1 and its symmetry mate in the structure of sm-Tmβ98. C, superimposition of the three overlap complexes formed by the dimers of the structure sm-Tmβ98 and their respective symmetry mates. D and E, four-helix bundles formed by the overlap complexes of sm-Tmα81 and sm-Tmβ98 viewed along the longitudinal axis of the coiled coil. Note that the distances between the N- and C-terminal helices are similar. N-terminal residues Met1 and Met8 make part of the hydrophobic interface in all the overlap complexes characterized thus far.