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Proton conduction in water and through gramicidin and voltage-gated proton channels
| Property | Bulk water | Gramicidin | Proton channel |
|---|---|---|---|
| Selectivity (PH+/PNa+) | 71 | 38–602 | 106−108(3) |
| Deuterium isotope effect (IH+/ID+) | 1.414 | 1.355 | 1.96 |
| Activation energy (kcal mol−1) | 2.67 | 3–88 | 18–279 |
The activation energies listed are for proton permeation through open channels. The temperature dependence of gramicidin includes measurements of several modified dioxolane-linked channels.
