Table 2.
Thermodynamic parameters of XcAP-1, −2, and −3 binding to biogenic amines in the presence or absence of saturating concentrations of LTC4.
| Protein | Ligand | K (M−1) | ΔH (cal/mol) | ΔS (cal/mol/deg) |
|---|---|---|---|---|
| XcAP-1 | Serotonin | 1.69 × 108 ± 8.97 × 107 | −1.573 × 104 ± 536.1 | − 14.2 |
| LTC4/Serotonin | 5.48 × 108 ± 3.01 × 107 | −1.598 × 104 ± 390.6 | − 12.7 | |
| XcAP-2 | Histamine | 2.28 × 107 ± 6.08 × 106 | −2.112 × 104 ± 718.5 | −36.0 |
| LTC4/Histamine | 4.07 × 107 ± 7.83 × 106 | −2.057 × 104 ± 397.2 | −33.0 | |
| XcAP-3 | Histamine | 3.43 × 107 ± 9.18 × 106 | −1.509 × 104 ± 402.3 | −15.3 |
| LTC4/Histamine | 7.35 × 107 ± 2.86 × 107 | −1.436 × 104 ± 434.2 | −11.4 |