Fig. 4.
Two views of the PRODH domain of E. coli PutA complexed with the proline analog THFA. The orientations shown here are similar to those of Fig. 3. β-strands and α-helices of the (βα)8 barrel are colored magenta and cyan, respectively. Helix 8 is colored red. Selected strands and helices are numbered. The FAD cofactor and THFA inhibitor are shown in yellow and green sticks, respectively. The helical elbow that wraps around the barrel is shown in yellow. Residues following the barrel are colored slate. The dotted curve indicates poorly ordered parts of the polypeptide chain between residues 147 and 263.