Figure 4.

pH Rate Profile. The pH rate profile is presented at 10 mM ALA in BTP-HCl in the presence (○) and absence (□) of 0.1 M KCl. Protein was 15 μg ml^-1. The K_m (filled tringle) and V_max (filled circle) values as a function of pH at (0.15 μg ml^-1) are given in units of mM and A₅₅₅, respectively.