Figure 3.

Structures of B. anthracis class D sortase. (A) Stereoview of the overlay of the ensemble of NMR structures of BaSrtC_Δ55 (PDB entry 2LN7). The unassigned β2–β3 and β4–H1 loops are colored red. The assigned but poorly ordered β7–β8 loop is colored orange. (B) Ribbon diagram with secondary structure elements labeled. Loop structures are labeled with text. Active site residue side chains for Arg¹⁸⁵, Cys¹⁷³, and His⁸⁶ are colored green.