(b).
Hydrogen bonds and salt bridges between the DBD and the OBD.
| No. | OBD residue atom | Distance (Å) | DdB residue atom |
|---|---|---|---|
| 1 | Tyr454 OH | 2.55 | Glu168 OE2 |
| 2 | Glu457 OE1 | 2.53 | Arg172 NH2 |
| 3 | Glu457 OE2 | 3.26 | Arg172 NH1 |
| 4 | Glu457 OE1 | 3.03 | Arg172 NH1 |
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