Figure 1
The overall fold of the trimer, showing monomers A (yellow), B (blue) and C (red). The secondary-structure elements are also indicated. The difference (|Fo − Fc|) Fourier map drawn at 2.5σ cutoff was calculated by omitting the contents of the trimeric pore. The figure was produced with the help of the programs BOBSCRIPT (Esnouf, 1997) and RASTER3D (Merritt & Murphy, 1994). |