Table 2. Parameters describing the effects of nucleotides on Co2+- and Mn2+-bound mtCBS-PPase.
Co2+/Mg2+-activated enzyme | Mn2+/Mg2+-activated enzyme | |||||
---|---|---|---|---|---|---|
Enzyme | Nucleotide | A+L/A−L (%) | Kd (μM) | A+L/A−L (%) | Kd (μM) | Source |
Wild-type | AMP | 3.7±0.4 | 0.22±0.02 | 20±4 | 1.4±0.2 | Inhibition of activity (Figure 1) |
AMP | 0.17±0.05 | Effect on ATP activation | ||||
ADP | 0.8±0.3 | 0.012±0.001 | 21±2 | 0.033±0.004 | Inhibition of activity (Figure 1) | |
ADP | 0.017±0.005 | Effect on ATP activation (Figure 3) | ||||
ATP | 180±10 | 0.20±0.05 | 400±40 | 7.2±0.8 | Inhibition of activity (Figure 1) | |
ATP | 0.16±0.01 | Effect on AMP inhibition | ||||
ATP | 0.6±0.2 | Effect on ADP inhibition (Figure 3) | ||||
CDP | <10 | 150±20 | Inhibition of activity | |||
UDP | <10 | 340±90 | Inhibition of activity | |||
Y169A | AMP | 52±2 | 5.3±0.9 | Inhibition of activity | ||
ADP | 6.7±0.4 | 0.21±0.02 | Inhibition of activity | |||
ATP | 143±4 | 2.4±0.9 | Inhibition of activity |