| Porin | Rhodobacter capsulatus | Forms channels that allow the passive diffusion of small hydrophilic solutes up to an exclusion limit of about 0.6 kDa. | 1 | Details |
| Porin | Rhodopseudomonas blastica | Forms channels that allow the passive diffusion of small hydrophilic solutes up to an exclusion limit of about 0.6 kDa. | 1 | Details |
| Porin | Escherichia coli | Not Available | 3 | Details |
| Porin D | Pseudomonas aeruginosa (strain ATCC 15692 / PAO1 / 1C / PRS 101 / LMG 12228) | Porin with a specificity for basic amino acids. Also possesses serine protease activity. | 1 | Details |
| Porin P | Pseudomonas aeruginosa (strain ATCC 15692 / PAO1 / 1C / PRS 101 / LMG 12228) | Anion specific, the binding site has higher affinity for phosphate than chloride ions. Porin O has a higher affinity ... more | 1 | Details |
| Porphobilinogen deaminase | Escherichia coli (strain K12) | Tetrapolymerization of the monopyrrole PBG into the hydroxymethylbilane pre-uroporphyrinogen in several discrete steps. | 1 | Details |
| Possible exported protein | Mycobacterium tuberculosis H37Rv | Not Available | 1 | Details |
| Potassium | Humans | Not Available | 3 | Details |
| Potassium channel subfamily K member 1 | Humans | Ion channel that contributes to passive transmembrane potassium transport and to the regulation of the resting membra... more | 3 | Details |
| Potassium channel subfamily K member 10 | Humans | K(+) channel that conducts voltage-dependent outward rectifying currents upon membrane depolarization. Voltage sensin... more | 8 | Details |
| Potassium channel subfamily K member 18 | Humans | K(+) channel that conducts outward and inward rectifying currents at depolarized and hyperpolarized membrane potentia... more | 9 | Details |
| Potassium channel subfamily K member 2 | Humans | K(+) channel that conducts voltage-dependent outward rectifying currents upon membrane depolarization. Voltage sensin... more | 12 | Details |
| Potassium channel subfamily K member 3 | Humans | K(+) channel that conducts voltage-dependent outward rectifying currents upon membrane depolarization. Voltage sensin... more | 7 | Details |
| Potassium channel subfamily K member 6 | Humans | K(+) channel that conducts outward rectifying currents at the membranes of the endolysosomal system. Active in lysoso... more | 2 | Details |
| Potassium channel subfamily K member 9 | Humans | K(+) channel that conducts voltage-dependent outward rectifying currents upon membrane depolarization. Voltage sensin... more | 7 | Details |
| Potassium channel subfamily T member 1 | Humans | Sodium-activated K(+) channel. Acts as an important mediator of neuronal membrane excitability. Contributes to the de... more | 4 | Details |
| Potassium channel subfamily T member 2 | Humans | Sodium-activated and chloride-activated potassium channel. Produces rapidly activating outward rectifier K(+) current... more | 2 | Details |
| Potassium voltage-gated channel subfamily A member 1 | Humans | Voltage-gated potassium channel that mediates transmembrane potassium transport in excitable membranes, primarily in ... more | 7 | Details |
| Potassium voltage-gated channel subfamily A member 10 | Humans | Voltage-gated potassium ion channel that mediates K(+) permeability of excitable membranes. When opened in response t... more | 1 | Details |
| Potassium voltage-gated channel subfamily A member 2 | Humans | Voltage-gated potassium channel that mediates transmembrane potassium transport in excitable membranes, primarily in ... more | 2 | Details |
| Potassium voltage-gated channel subfamily A member 3 | Humans | Mediates the voltage-dependent potassium ion permeability of excitable membranes. Assuming opened or closed conformat... more | 3 | Details |
| Potassium voltage-gated channel subfamily A member 4 | Humans | Voltage-gated potassium channel that mediates transmembrane potassium transport in excitable membranes. Forms tetrame... more | 2 | Details |
| Potassium voltage-gated channel subfamily A member 5 | Humans | Voltage-gated potassium channel that mediates transmembrane potassium transport in excitable membranes. Forms tetrame... more | 11 | Details |
| Potassium voltage-gated channel subfamily A member 6 | Humans | Voltage-gated potassium channel that mediates transmembrane potassium transport in excitable membranes. Forms tetrame... more | 1 | Details |
| Potassium voltage-gated channel subfamily A member 7 | Humans | Mediates the voltage-dependent potassium ion permeability of excitable membranes. Assuming opened or closed conformat... more | 1 | Details |