A docking model of Ara1 complexed with diacetyl or 2,3-pentanedione. (a, b) Binding patterns of (a) diacetyl and (b) 2,3-pentanedione. (c, d) Surface potentials of Ara1 complexed with (c) diacetyl and (d) 2,3-pentanedione. Residues are shown as cyan sticks and diacetyl or 2,3-pentanedione as grey sticks. NADPH is shown as thinner sticks. Hydrogen bonds are shown as black dashes.