A-B, Structures of isolated AtGLR3.2 LBD (S1S2) in complex with glycine (A) and methionine (B). The ligands are in ball-and-stick representation. Highly conserved cysteines, C230 and C284, are connected by disulfide bonds and shown in sticks. C-D, Close-up views of the ligand-binding pocket with bound glycine (C) and methionine (D). Residues involved in ligand binding are shown in sticks. Interactions between the ligands and the binding pocket residues are indicated by dashed lines.
See also Figures S1 and S2.