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(A) Superposition of the active site clefts of the five AST structures AST-1BZA (red), AST-2BEA (green), AST-3PEA (blue), AST-4PPA (magenta), and no inhibitor AST-Free (black). (B) The S1 site of BT with BT-1BZA (red), BT-2BEA (green), BT-ANL (orange), BT-3PEA (blue), BT-5PBA (magenta), and no inhibitor BT-Free (black).
