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The Rates of Myosin Basal and Actin Activated ATPase Activity With Metal.ATP as a Ligand
| Experimental data | ||||||
|---|---|---|---|---|---|---|
| Cation | Ionic radius, Angstroms | Coordination number | Basal ATPase, s−1 | Actin activated ATPase, s−1 | Actin activation, s−1 | Km, Michaelis constant |
| Mg2+ | 0.72 | 6 | 0.25 ± 0.04 | 3.73 ± 0.36 | 3.48 ± 0.36 | 39.8 ± 7.3 |
| Mn2+ | 0.83 | 6 | 1.19 ± 0.20 | 5.66 ± 0.20 | 4.46 ± 0.04 | 49.5 ± 13.1 |
| Ca2+ | 1.0 | 7 | 3.86 ± 0.71 | 7.92 ± 0.75 | 4.06 ± 0.23 | 50.0 ± 33.0 |
