Fig. 4.

Homology model of an MRCA with possible metallo-β-lactamase functionality. The sequence representative number 51 passed both criteria for being most like a B3 metallo-β-lactamase. The PHYRE2 homology model (cartoon, rainbow) aligned with 1SML with an RMSD of 3.5 angstroms. A zoomed in image of each homology model’s predicted catalytic residues is shown. Homology model predicted residues ASP (green) aligned with catalytic ASP residues in the B3 template (grey). Homology model predicted residues TYR (orange) aligned with catalytic TYR residues in the B3 template (grey). Distances are shown in angstroms. Image was generated using Pymol (Schrodinger LLC 2010)