Table 6. Distances between Cα atoms of selected residues across the switch and joint regions of the αβ dimer interface.
Values in parentheses are for the pseudo-symmetrical contact where there are two αβ dimers in the crystallographic asymmetric unit.
| Residue 1 | Residue 2 | T deoxyHb (2dn2) | R HbO2 (2dn1) | ζ2β2 S HbCO (3w4u) | Cat aquometHb (3gqp) | IsdHN2N3–aquometHb (4xs0) |
|---|---|---|---|---|---|---|
| α1Pro95(FG7) | β1Pro100(FG7) | 21.6 (21.9) | 18.9 | 19.7 (19.8) | 18.6 (19.2) | 19.1 |
| α1Pro95(FG7) | β2Trp37(C3) | 9.5 (9.4) | 8.4 | 12.9 (13.1) | 13.8 (13.0) | 13.2 |
| β1Pro100(FG7) | α2Thr38(C3)† | 7.1 (7.2) | 10.0 | 7.0 (7.0) | 7.4 (7.0) | 6.9 |
| α2Thr38(C3)† | β2Trp37(C3) | 29.0 (29.0) | 29.1 | 29.9 (29.8) | 28.9 (29.1) | 29.2 |
†
Replaced by α2Gln38(C3) in PDB entry 3w4u.