Table 1.
Potential hydrogen bond interactions of the ligands in the Ang − Pi, Ang − PPi and Q117G − Pi complexes
| Donor | Acceptor | Ang − Pi | Ang − PPi | Q117G − Pi |
| Gln12 Nɛ2 | PiO4 | 2.64 | — | 2.72 |
| PPiO4 | — | 2.72 | — | |
| His13 Nɛ2 | PiO4 | 3.16 | — | 3.13 |
| PiO2 | 3.19 | — | 2.97 | |
| PPiO7 | — | 3.16 | — | |
| PPiO4 | — | 3.21 | — | |
| PPiO2 | — | 3.06 | — | |
| Lys40 Nζ | PiO4 | 3.21 | — | — |
| His114 Nδ1 | PiO3 | 3.39 | — | 2.79 |
| PPiO2 | — | 3.18 | — | |
| PPiO3 | — | 2.72 | — | |
| PPiO1 | — | 3.23 | — | |
| Leu115 N | PiO2 | 3.03 | — | 2.76 |
| PPiO2 | — | 2.51 | — | |
| PiO1 | Leu115 O | 3.19 | — | 2.91 |
| PPiO2 | — | 2.87 | — | |
| PPiO7 | — | 3.14 | — | |
| Gln117 Oɛ1 | PPiO7 | — | 3.36 | — |
| Water | PPiO1 | — | 2.93 | — |
| Water | PPiO4 | — | 2.34 | — |
| Water | PPiO5 | — | 2.75 | — |
| Water | PPiO3 | — | 3.15 | — |
| Water | PPiO4 | — | 3.21 | — |
| Water | PPiO2 | — | 3.16 | — |
| Water | PPiO4 | — | 3.29 | — |
| Water | PiO3 | — | — | 2.81 |
| Water | PiO2 | — | — | 2.81 |
Numbers in columns are distances in Å. Hydrogen bonds are listed if the distance between a donor and an acceptor is shorter than 3.4 Å and if the angle O-H-N/O is >90°. Hydrogen bond distances were calculated with the program contact (CCP4 version 4.0). Oxygen atoms 1–4 of PPi correspond to the four oxygens of Pi.