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Figure 4 Activity of ZmBAM7-S. (a) Gel showing the purity and amount of AtBAM2 and ZmBAM7-S used in activity assays. (b) Effect of substrate concentration on ZmBAM7-S (gray) and AtBAM2 (black) activity on a per milligram of protein basis. Points are shown for each of three replicate assays. Data were fitted to the Michaelis–Menten equation for cooperative enzymes. For AtBAM2 the Km was 59.4 mg ml−1 (95% confidence interval 58–61 mg ml−1) and for ZmBAM7-S the Km was 86.9 mg ml−1 (95% confidence interval 83–91 mg ml−1). The fitted data and all kinetic values are shown in Supplementary Fig. S4. |