Figure 2
Carbonic anhydrase 2 in crystal form 2. (a) The P42212 unit cell contains one subunit per asymmetric unit, with tetramers formed at the 222 centers. The protomer in the asymmetric unit is coloured from the N-terminus (blue) to the C-terminus (red). The bound metal, presumably Zn2+, is shown as a grey sphere. (b) View of the active site. Polder (Liebschner et al., 2017) density (green, 7σ) is shown for the presumed Zn2+ ion and its coordinating residues. Anomalous difference density is in magenta (20σ). |