Figure 4.

Putative CO₂ binding site. (A) Stereo view of the F_o - F_c electron density map of bound ligand, presumed to be CO₂, in LCI1, with the putative bound CO₂ ligand and residues putatively involved in CO₂ binding shown as a stick model (cyan, carbon; blue, nitrogen) and as green sticks, respectively. The F_o - F_c map is contoured at 3.0 σ (blue mesh). (B) A composite figure showing the locations of the predicted bound CO₂ ligand (yellow) and the putative bound CO₂ (cyan) identified in the LCI1 crystal structure.