Superimposition of members of the S66 serine protease family. A. Ribbon diagram showing a subunit of BaMccF (green, red and magenta) overlaid over a subunit of the dimer of the LdcA from P. aeruginosa (PDB code: 2AUM) (gray), which has been identified as having the closest matching folds. The catalytic triad in both structures (BaMccF S112, E269, H303 correspond to LdcA residues: S115, E217, H285) are positioned similarly. Selected secondary elements of BaMccF are highlighted.