Fig. 2
From: Structural basis for amino acid transport by the CAT family of SLC7 transporters
Structure of the amino acid binding site. a Molecular surface representation of GkApcT showing the bound l-Ala ligand and position of the solvent filled extracellular and cytoplasmic tunnels with water shown as red spheres. b Zoomed in view of the ligand binding site, showing the location of waters in the cytoplasmic tunnel (brown shading) and location of the cytoplasmic thin gate. c View of the bound l-Ala ligand, showing the mFo-DFc difference electron density map contoured at 3σ, grey. d Zoomed in view of the cytoplasmic tunnel, showing the interaction between the acidic residues in TM3 and 6. e View of the water molecule coordinating the α-carboxylate group of the l-Ala ligand
