FIGURE 6.

Comparison of the structures of A46 and A52. A, superimposition of A46 (magenta) to residues 54–189 of A52 (cyan). Faces involved in dimer formation are shown in light pink (A46) and light blue (A52). B, the A46 dimer. Molecule C of A46 (magenta) is in the same orientation as in Fig. 6A, and molecule D is colored as a spectrum from the N terminus to the C terminus. Residues involved in dimer formation are shown as sticks. C, enlarged view of the residues in the A46 dimer interface shown in A, rotated 45° on the x axis to allow better visualization of the side chains. D, as in A, except that the second monomer is included for each protein. Drawings were made as in Fig. 5.