(b).
Interatomic distances (in ) between the conserved residues from the hinge region of Hi-SiaP, Pm-SiaP and Fn-SiaP in the presence of Neu5Ac. Residue numbers correspond to Fn-SiaP.
| Residue | Atom | Residue | Atom | Fn-SiaP | Pm-SiaP | Hi-SiaP |
|---|---|---|---|---|---|---|
| Arg126 | NH1 | Asn186 | ND2 | 3.5 | 3.4 | 3.5 |
| NH1 | WAT | 3.3 | 3.3 | 3.2 | ||
| NH1 | Neu5Ac | O2 | 3.0 | 2.9 | 2.9 | |
| NH1 | Asn211 | OD1 | 4.1 | 4.1 | 4.0 | |
| NH2 | Asn186 | ND2 | 3.4 | 3.4 | 3.4 | |
| NH2 | Glu185 | OE1 | 3.5 | 3.8 | 3.9 | |
| NH2 | Neu5Ac | O2 | 3.4 | 3.3 | 3.2 | |
| NH2 | Neu5Ac | O1A | 3.3 | 3.2 | 3.1 | |
| NE | Glu185 | OE1 | 2.3 | 2.7 | 2.8 | |
| NE | Asn153 | ND2 | 3.4 | 3.4 | 3.5 | |
| Glu185 | OE1 | His208 | NE2 | 2.9 | 2.8 | 2.7 |
| Asn211 | OD1 | WAT | 3.2 | 3.2 | 3.2 | |
| ND2 | WAT | 2.7 | 2.7 | 2.8 | ||
| ND2 | Glu67 | OE2 | 3.8 | 3.7 | 3.8 |