Figure 4

Cross-eyed stereo cartoon representation of the BT2193 structure. It is coloured light pink (largely irregular extreme N-terminal region), shades of grey in the N-terminal domain (light grey repeat 1, mid-grey repeat 2, dark grey repeat 3), magenta (inter-domain linker) and thereafter as a spectrum (blue start to red end in the C-terminal barrel domain). The putative catalytic triad (see later) is shown as sticks and a glycerol molecule bound as ball and stick. A semi-transparent surface helps visualise the presence of the site and bound glycerol in a cleft between the two domains.