Figure 2

(A) Scheme of the distortion form ideal geometry of the internal aldimine imine plane. (B) Structural superposition of the internal aldimine formed by E. coli aspartate aminotransferase (AAT) in complex with PLP (yellow: PDB id 1 ARS) and 1-deaza-PLP (magenta: PDB id 3QN6)⁷.