Fig. 7. Illustration of the ligand binding site predictions for the pcx domain. The ligand binding site predictions of the pcx domain were executed by COACH, combining the results from five algorithms: COFACTOR, TM-SITE, S-SITE, FindSite and ConCavity. The best model was considered to be 3f1uA due to its higher C score (0.05) and cluster size of 3; also, it binds to the Zn ligand. The predicted ligand binding is indicated with yellow-green spheres, and the corresponding binding residues are shown with blue balls and sticks.