Fig. 4
![Fig. 4](http://media.springernature.com/full/springer-static/image/art%3A10.1186%2Fs12934-022-01791-8/MediaObjects/12934_2022_1791_Fig4_HTML.png)
Overall view on residues lining the active site of Copu9. Same color coding as in Fig. 3. The three Mg2+ ions are shown as green spheres and the AHD in stick representation. The cavity of the active site pocket is indicated as an inverted surface displayed in gray