Figure 2.

Stereo diagram of the electron density at the interface of the s-syntaxin dimer. 2F_o-F_c electron density at 1.0 σ of the contact region between molecule B and the C-terminus of molecule A is shown as a meshwork in cyan. Carbon atoms in molecules A and B are shown in beige and grey, respectively. Heteroatoms are indicated in red (oxygen), blue (nitrogen) and yellow (sulphur). Dashed lines indicate polar interactions stabilizing such a conformation. Residues 32 to 69 in molecule B have been omitted for clarity.