FIG 4.
Putative binding sites in PiuA of P. aeruginosa and A. baumannii and PirA of A. baumannii. The color scheme is the same as that in Fig. 3. The phosphate ion present in the Ab-PiuA structure is colored orange and red, and residues Asp303 and Glu73, which coordinate it, are represented as green and white sticks.
