Fig. 1.
Structure of the derCD23–Fcε3-4 complex. The two molecules of derCD23 (light and dark blue Cα traces with surfaces) bind one to each heavy chain between the Cε3 (dark red and green) and Cε4 domains (light red and green). The carbohydrate is shown in all-atom representation (red and yellow, without surfaces) and can be seen behind the (red) Cε3 domain. The adjacent N and C termini of each derCD23 molecule, the former being the connection to the “stalk,” the latter to the “tail” region, can be seen at the extreme left and right of the figure. [The complex shown here comprises chains A (red), B (green), G (light blue), and H (dark blue)].