Table 1.
Frequency of helix-8-second residues in human and mouse olfactory receptors (ORs).
| Subclass ORs | Helix-8 Second Residue | ||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|
| All | Glu | Gln | Asp | Lys | His | Ala | Pro | Tyr | Val | misc | |
| Human class-I ORs | 52 | 12 | 36 | 0 | 1 | 1 | 0 | 1 | 0 | 0 | 1 |
| 100% | 23% | 69% | 0% | 2% | 2% | 0% | 2% | 0% | 0% | 2% | |
| Murine class-I ORs | 123 | 29 | 83 | 0 | 5 | 0 | 0 | 3 | 0 | 3 | 0 |
| 100% | 24% | 67% | 0% | 4% | 0% | 0% | 2% | 0% | 2% | 0% | |
| Human class-II ORs | 322 | 155 | 22 | 128 | 6 | 2 | 3 | 0 | 1 | 1 | 4 |
| 100% | 48% | 7% | 40% | 2% | 1% | 1% | 0% | 0% | 0% | 1% | |
| Total human ORs | 374 | 167 | 58 | 128 | 7 | 3 | 3 | 1 | 1 | 1 | 5 |
| 100% | 45% | 16% | 34% | 2% | 1% | 1% | 0% | 0% | 0% | 1% | |