Figure 7.

The μ1 protein. A) Ribbon diagram of the crystal structure of the T1L μ1 trimer without bound σ3.⁸⁸ One μ1 subunit is colored by domain (domain I, light and dark blue [μ1N, μ1C]; domain II, light and dark green [μ1N, μ1C]; domain III, red; domain IV, yellow); the other two μ1 subunits are shown in gray. β-octyl glucosides and sulfate ions present in the structure are shown in red and yellow. B) Surface-shaded representation of an isolated μ1 subunit. Colors and orientation are as in (A). C) Domain segmentation of the amino acid sequence as determined from the three-dimensional structure. Domain color code as in (A) and (B). The central domain II contains domains I and III as “inserts,” and domain III similarly contains domain IV. Figure and legend modified from: Liemann S et al, Cell 108:283-295; ©2002 with permission from Elsevier.⁸⁸