Table 1.
Low-Frequency Modes (<200 cm−1) of Mb Speciesa
| Mb | φγa | γa | γb | γc | γd | γe | ν18 | |
|---|---|---|---|---|---|---|---|---|
| metc (418 nm) | ~π/2 | 39 (s) | 73 (m) | 104 (w) | 141 (w) | 187 (w) | 6cHS(3+) | |
| deoxy (430 nm) | ~2π/3 | 46 (m) | 67 (w) | 98 (s) | 119 (s) | 160 (m) | 180 (m) | 5cHS(2+) |
| +F− (417 nm) | ~π/2 | 39 (s) | 80 (m) | 125 (w) | 147 (w) | 188 (w) | 6cHS(3+) | |
| +CNb (433 nm) | ~π/2 | 40 (s) | 67 (w) | 100 (m) | 127 (m) | 153 (w) | 184 (m) | 6cLS(3+) |
| H64L (405 nm) | ~π/2 | 46 (m) | 78 (w) | 123 (s) | 153 (w) | 182 (w) | 5cHS(3+) |
a
Mode frequencies are in cm−1. The (s,m,w) denote (strong, medium, weak) intensity in the extracted power spectrum. The phase of the γa is shown in the second column.
b
Possibility of proximal histidine photolysis means some frequencies could represent five-coordinated ferric species.
c
Water bound as sixth ligand.