Table 4. Affinity and enthalpy for DsbB-derived peptides binding to DsbA proteins1.
DsbA | DsbB-peptide | Stoichiometry | Kd (μM) | ΔH (kcal/mol) |
---|---|---|---|---|
EcDsbA | PSPFATCD | 1.0 | 16.1 ± 1.8 | -8.4 ± 0.1 |
PSPFQTCD | 0.99 | 10.9 ± 0.6 | -9.1 ± 0.2 | |
KpDsbA | PSPFATCD | 0.93 | 17.9 ± 1.5 | -9.5 ± 0.7 |
PSPFQTCD | 0.97 | 16.7 ± 0.6 | -11.1 ± 0.2 |
Apparent dissociation constant (Kd) and enthalpy of binding (ΔH) at 20 °C obtained from three independent ITC experiments. See Figure S3 for representative ITC traces.