Table 2. Kinetic Parameters of Heme Binding and Transfer.
| off rate ± SE (×10–3 s–1) |
|||||
|---|---|---|---|---|---|
| KD ± SE (heme; μM) | kfast | kslow | ktransfer ± SE (s–1) | KDa ± SE (μM) | |
| IsdB-N2 WT | <0.38 ± 0.06 | 28 ± 3 | 4.8 ± 0.02 | 81.5 ± 5.7 | 18.6 ± 3.2 |
| IsdB-N2 M362L | <0.49 ± 0.09 | 130 ± 11 | 13 ± 0.04 | 34.4 ± 2.4 | 16.5 ± 3.5 |
Estimated dissociation constant for the protein complexed with IsdA-N1.