Fig. 5.

Mo₁₃ POM located in a nonpolar hydrophobic region (PDB entry: 4NDO). The Mo₁₃ POM was not modeled but the 13 molybdenum atoms are illustrated as deep teal spheres. The protein is represented as differently colored cartoons to indicate different monomers, whereas the nonpolar side chains of valine, proline and the polar serine are depicted as sticks (color code: carbon atoms = green/cyan/magenta, nitrogen atoms = blue, oxygen atoms = red). These side chains are additionally shown at the bottom of the figure to provide a close view. Serine is always depicted with its alternative conformation (with the second position of the hydroxyl group) where the hydroxyl positions are designated by the number 1 and 2. The closest amino acids surrounding the Mo₁₃ POM are all nonpolar (glycines are also present but not illustrated as sticks). Further away from the cluster there are a few serines in the predominantly hydrophobic protein portion.