Table 2. On and Off Rates and Binding Constants for Several Protein-NO (or CO) Complexes.
kon(M–1 s–1) | koff (s–1) | KCat-NO = kon/koff (M–1) | |
---|---|---|---|
Mb(Fe2+)COa | 5.1 × 105 | 1.9 × 10–2 | 2.7 × 107 |
Mb(Fe2+)NOa | 1.7 × 107 | 1.2 × 10–4 | 1.4 × 1011 |
Mb(Fe3+)NOb | 4.8 × 104 | 42 | 1.14 × 103 |
Lb(Fe2+)NOa | 1.2 × 108 | 2.0 × 10–5 | 5.9 × 1012 |
NP1(Fe3+)NOc | 1.5 × 106 (pH 5) | 0.18 (pH 5) | 8.3 × 106 (pH 5) |
1.5 × 106 (pH 8) | 1.25 (pH 8) | 1.2 × 106 (pH 8) | |
NP4(Fe3+)NOc | 2.1 × 106 (pH 5) | 0.11 (pH 5) | 2.0 × 107 (pH 5) |
2.3 × 106 (pH 8) | 1.24 (pH 8) | 1.9 × 106 (pH 8) | |
Cat(Fe3+)NOd | 1.3 × 107 | 1.5 | 8.7 × 106 |