Fig. 2: FOS densities and interactions with the transporter.
From: Insights into SusCD-mediated glycan import by a prominent gut symbiont
a 2Fo-Fc density (contoured at 1.0σ, carve = 2) of FOS1 bound in the primary binding site rotated by 90°. The glycan branch point is indicated with an arrow. b Close-ups of the principal FOS binding site with residues making polar interactions with the substrate shown as stick models and coloured as in panel (b). Polar interactions are shown as dashed lines, and water molecules as red spheres. For both Bt1762 and Bt1763, residue numbering is for the mature protein without the signal sequence, that is, starting at C19 for Bt1762 and G26 for Bt1763. c Close-ups of the FOS2 binding site with polar interactions indicated. Plug residues are coloured purple.
