Docking poses of two newly discovered substrates. (a) Compound
82, shown in green sticks is docked in the outward-open
conformation (beige). (b) Compound 59, shown in cyan sticks, is
docked in the outward-occluded conformation (light blue). While both compounds
occupy PA, as predicted, compound 82 establishes additional
hydrogen bonds with Glu136 and Ser342.