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Differences from wild type when aspartate binds to the S68A receptor
| Structural feature | Wild type | S68A |
|---|---|---|
| Downward shift at helix α4, Å | 1.5 | 1.3 |
| Tilt at helix α4 relative to helix α1, degrees | 5 | 2 |
| Inter-subunit angle, degrees | 4 | 0 |
| New hydrogen bond formation | Ser-68′ to Tyr-149′ in the unoccupied site | Both sites have aspartate |
