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. 2017 Jun 12;8:15758. doi: 10.1038/ncomms15758

Figure 4. POA selectively inhibits the enzymatic activity of Arabidopsis ACO enzymes.

Figure 4

(a) Quantifications of the relative AtACO2 activity treated with different concentrations of POA. Values represent the mean (±s.d.) of three replicates, and the experiment was carried out twice with similar results. (b) Kinetic analysis of AtACO2 inhibition by POA. Activity assays were performed with varying concentration of ACC in the absence and presence of 100, 200 or 300 μM POA. Double-reciprocal plots of initial velocities (Lineweaver–Burk plots) showing a competitive inhibition. The experiment was carried out twice with similar results. (c) Kinetic analysis of the inhibition by POA to AtACO1, AtACO3, AtACO4 and AtACO5. Activity assays were performed with varying concentration of ACC in the absence (+DMSO) and presence of 200 μM POA. The experiment was carried out twice with similar results. (d) The interactions between POA and AtACO2, GA2OX2, ANS as well as DAO were measured using ITC. N.D., not determined.