Fig 2. Effect of aromatic d-amino acids and combinations of d- and l-amino acids on MtuDAH7PS activity.

Error bars represent standard deviation of replicates, all activities are normalized to the activity obtained without addition of any aromatic amino acids. The triple combination of d-WFY was conducted at 0.8 mM concentration each to avoid non-linear effects at high absorbance in the photometric assay. The concentration of both PEP and E4P was 150 μM. W = tryptophan, F = phenylalanine, Y = tyrosine.