Fig. 2.

(A) Stereoview showing the overall structure of PagF with the secondary structural elements labeled and numbered. (B) Stereoview of the active site of PagF in complex with DMSPP (green) and substrate Tyr (cyan). The secondary structural elements are named as in A, and residues that interact with DMSPP are colored in gray. The requisite magnesium ion is shown as a gray sphere. A simulated annealing omit (|F_obs − F_calc|) difference Fourier electron density map, calculated with the coordinates for DMSPP omitted, is superimposed at 2.4σ (blue) and 10σ (green) above background.