Figure 1: Structure of CgGDE.

(a) Domain arrangement of GDE. Domains M1, M2 and GC, and the GT subdomains A, B and C are colour-coded. This colouring scheme is used throughout the manuscript unless otherwise indicated. Domain boundaries for CgGDE are indicated. (b,c) Crystal structure of CgGDE. The views are related by an 180° rotation around the vertical axis. The red stars in b indicate the active sites. Bound oligosaccharides are shown in stick representation with their carbon atoms in black. Structural figures were prepared with pymol (http://www.pymol.org).