Target type: molecularfunction
Enables the transmembrane transfer of an ion by a voltage-gated channel. An ion is an atom or group of atoms carrying an electric charge by virtue of having gained or lost one or more electrons. A voltage-gated channel is a channel whose open state is dependent on the voltage across the membrane in which it is embedded. [GOC:mtg_transport, ISBN:0198506732, ISBN:0815340729]
Voltage-gated monoatomic ion channel activity refers to the regulated passage of single atom ions across cell membranes. These channels, embedded within the lipid bilayer, are crucial for maintaining cellular homeostasis and signaling. Their function is dependent on changes in membrane potential, triggering a conformational shift in the channel protein that opens or closes the ion-conducting pore. This process is highly selective, allowing specific ions like sodium, potassium, calcium, or chloride to traverse the membrane while barring others.
Key features of this activity include:
* **Voltage-gated:** The channel's opening and closing are regulated by changes in the membrane potential, essentially acting as "electrical sensors" within the cell.
* **Monoatomic ion selectivity:** These channels are designed to allow the passage of single atom ions, like sodium or potassium, preventing the movement of larger molecules or other ions.
* **Conformational change:** The channel protein undergoes a structural rearrangement upon activation, opening or closing the ion-conducting pore.
* **Selective permeability:** Each channel exhibits a distinct preference for a specific ion, contributing to the intricate balance of ion concentrations within the cell.
These channels are central to various cellular processes, including:
* **Action potential propagation:** Nerve impulse conduction relies on the rapid influx and efflux of sodium and potassium ions through voltage-gated channels.
* **Muscle contraction:** Calcium ion movement through voltage-gated channels triggers muscle fiber contraction.
* **Cellular signaling:** Changes in ion concentrations mediated by these channels are essential for various signaling pathways, influencing cellular behavior and gene expression.
* **Maintaining membrane potential:** The controlled movement of ions through voltage-gated channels is crucial for maintaining the electrochemical gradient across the cell membrane, vital for cell function.
In essence, voltage-gated monoatomic ion channel activity is a fundamental process that underpins electrical signaling and numerous cellular functions. This highly regulated activity ensures the precise control of ion flow across cell membranes, vital for maintaining cellular homeostasis and mediating crucial biological processes.'
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| Protein | Definition | Taxonomy |
|---|---|---|
| Potassium voltage-gated channel subfamily A member 3 | A voltage-gated potassium channel subunit KCNA3 that is encoded in the genome of human. [PRO:CNA, UniProtKB:P22001] | Homo sapiens (human) |
| Voltage-dependent T-type calcium channel subunit alpha-1H | A voltage-dependent T-type calcium channel subunit alpha-1H that is encoded in the genome of human. [PRO:DNx, UniProtKB:O95180] | Homo sapiens (human) |
| Compound | Definition | Classes | Roles |
|---|---|---|---|
| 4-aminopyridine | aminopyridine; aromatic amine | avicide; orphan drug; potassium channel blocker | |
| tacrine | tacrine : A member of the class of acridines that is 1,2,3,4-tetrahydroacridine substituted by an amino group at position 9. It is used in the treatment of Alzheimer's disease. Tacrine: A cholinesterase inhibitor that crosses the blood-brain barrier. Tacrine has been used to counter the effects of muscle relaxants, as a respiratory stimulant, and in the treatment of Alzheimer's disease and other central nervous system disorders. | acridines; aromatic amine | EC 3.1.1.7 (acetylcholinesterase) inhibitor |
| N-(2-aminoethyl)-5-chloro-1-naphthalenesulfonamide | naphthalenes; sulfonic acid derivative | ||
| 5-methoxypsoralen | 5-methoxypsoralen : A 5-methoxyfurocoumarin that is psoralen substituted by a methoxy group at position 5. 5-Methoxypsoralen: A linear furanocoumarin that has phototoxic and anti-inflammatory properties, with effects similar to METHOXSALEN. It is used in PUVA THERAPY for the treatment of PSORIASIS. | 5-methoxyfurocoumarin; organic heterotricyclic compound; psoralens | hepatoprotective agent; plant metabolite |
| verapamil | 2-(3,4-dimethoxyphenyl)-5-{[2-(3,4-dimethoxyphenyl)ethyl](methyl)amino}-2-(propan-2-yl)pentanenitrile : A tertiary amino compound that is 3,4-dimethoxyphenylethylamine in which the hydrogens attached to the nitrogen are replaced by a methyl group and a 4-cyano-4-(3,4-dimethoxyphenyl)-5-methylhexyl group. verapamil : A racemate comprising equimolar amounts of dexverapamil and (S)-verapamil. An L-type calcium channel blocker of the phenylalkylamine class, it is used (particularly as the hydrochloride salt) in the treatment of hypertension, angina pectoris and cardiac arrhythmia, and as a preventive medication for migraine. Verapamil: A calcium channel blocker that is a class IV anti-arrhythmia agent. | aromatic ether; nitrile; polyether; tertiary amino compound | |
| clotrimazole | conazole antifungal drug; imidazole antifungal drug; imidazoles; monochlorobenzenes | antiinfective agent; environmental contaminant; xenobiotic | |
| nimodipine | nimodipine : A dihydropyridine that is 1,4-dihydropyridine which is substituted by methyl groups at positions 2 and 6, a (2-methoxyethoxy)carbonyl group at position 3, a m-nitrophenyl group at position 4, and an isopropoxycarbonyl group at position 5. An L-type calcium channel blocker, it acts particularly on cerebral circulation, and is used both orally and intravenously for the prevention and treatment of subarachnoid hemorrhage from ruptured intracranial aneurysm. Nimodipine: A calcium channel blockader with preferential cerebrovascular activity. It has marked cerebrovascular dilating effects and lowers blood pressure. | 2-methoxyethyl ester; C-nitro compound; dicarboxylic acids and O-substituted derivatives; diester; dihydropyridine; isopropyl ester | antihypertensive agent; calcium channel blocker; cardiovascular drug; vasodilator agent |
| diphenoxylate | diphenoxylate : A piperidinecarboxylate ester that is the ethyl ester of difenoxin. Diphenoxylate: A MEPERIDINE congener used as an antidiarrheal, usually in combination with ATROPINE. At high doses, it acts like morphine. Its unesterified metabolite difenoxin has similar properties and is used similarly. It has little or no analgesic activity. | ethyl ester; nitrile; piperidinecarboxylate ester; tertiary amine | antidiarrhoeal drug |
| paroxetine | paroxetine : A benzodioxole that consists of piperidine bearing 1,3-benzodioxol-5-yloxy)methyl and 4-fluorophenyl substituents at positions 3 and 4 respectively; the (3S,4R)-diastereomer. Highly potent and selective 5-HT uptake inhibitor that binds with high affinity to the serotonin transporter (Ki = 0.05 nM). Ki values are 1.1, 350 and 1100 nM for inhibition of [3H]-5-HT, [3H]-l-NA and [3H]-DA uptake respectively. Displays minimal affinity for alpha1-, alpha2- or beta-adrenoceptors, 5-HT2A, 5-HT1A, D2 or H1 receptors at concentrations below 1000 nM, however displays weak affinity for muscarinic ACh receptors (Ki = 42 nM). Antidepressant and anxiolytic in vivo. Paroxetine: A serotonin uptake inhibitor that is effective in the treatment of depression. | aromatic ether; benzodioxoles; organofluorine compound; piperidines | antidepressant; anxiolytic drug; hepatotoxic agent; P450 inhibitor; serotonin uptake inhibitor |
| mibefradil | Mibefradil: A benzimidazoyl-substituted tetraline that selectively binds and inhibits CALCIUM CHANNELS, T-TYPE. | tetralins | T-type calcium channel blocker |
| khellinone | khellinone: a Kv1.3 potassium channel blocker | ||
| vexibinol | sophoraflavanone G : A tetrahydroxyflavanone having a structure of naringenin bearing an additional hydroxyl substituent at position 2' as well as a (2R)-5-methyl-2-(prop-1-en-2-yl)hex-4-en-1-yl (lavandulyl) substituent at position 8'. vexibinol: flavanol from Sophora; structure in first source; RN given refers to (S-(R*,S*))-isomer | (2S)-flavan-4-one; 4'-hydroxyflavanones; tetrahydroxyflavanone | antimalarial; antimicrobial agent; antioxidant; plant metabolite |
| 8-prenylnaringenin | 8-prenylnaringenin: a phytogenic antineoplastic agent; structure in first source sophoraflavanone B : A trihydroxyflavanone that is (S)-naringenin having a prenyl group at position 8. | (2S)-flavan-4-one; 4'-hydroxyflavanones; trihydroxyflavanone | plant metabolite; platelet aggregation inhibitor |
| cardamonin | cardamonin: found in Zingiberaceae; structure in first source | chalcones | |
| (2'-(benzyloxycarbonylaminomethyl)biphenyl-2-carboxylic acid 2-(2-pyridyl)ethylamide) | biphenyls | ||
| tram 34 | TRAM 34: inhibits IKCa1; structure in first source | organochlorine compound | |
| uk 78282 | diarylmethane | ||
| flunarizine | Flunarizine: Flunarizine is a selective calcium entry blocker with calmodulin binding properties and histamine H1 blocking activity. It is effective in the prophylaxis of migraine, occlusive peripheral vascular disease, vertigo of central and peripheral origin, and as an adjuvant in the therapy of epilepsy. | diarylmethane | |
| 2-phenoxy-N-[5-(5,6,7,8-tetrahydronaphthalen-2-yl)-1,3,4-oxadiazol-2-yl]acetamide | tetralins | ||
| (S)-4',5,7-Trihydroxy-6-prenylflavanone | flavanones | ||
| np 118809 | 1-(4-benzhydrylpiperazin-1-yl)-3,3-diphenylpropan-1-one: an N-type calcium channel blocker; structure in first source | ||
| cilnidipine | 2-methoxyethyl ester; C-nitro compound; dihydropyridine | antihypertensive agent; calcium channel blocker; cardiovascular drug | |
| clathrodin | clathrodin: structure given in first source; isolated from marine sponges of the genus Agelas | ||
| oroidin | oroidin: from marine sponges of the genus Agelas; structure in first source | pyrroles; secondary carboxamide | metabolite |
| hymenidin | hymenidin: serotonergic receptor antagonist from Okinawan marine sponge Hymeniacidon; structure given in first source | ||
| 5-(4-phenylbutoxy)psoralen | 5-(4-phenylbutoxy)psoralen: structure in first source psora 4 : A member of the class of psoralens that is psoralen substituted by a 4-phenylbutoxy group at position 5. It is a potent inhibitor of the voltage-gated potassium channel Kv1.3 (EC50 = 3 nM). | aromatic ether; benzenes; psoralens | geroprotector; immunosuppressive agent; potassium channel blocker |
| ith 4012 | |||
| NNC 55-0396 (free base) | benzimidazoles; cyclopropanecarboxylate ester; organofluorine compound; tertiary amino compound; tetralins | angiogenesis inhibitor; antineoplastic agent; apoptosis inducer; neuroprotective agent; potassium channel blocker; T-type calcium channel blocker | |
| nnc 55-0396 | NNC 55-0396 dihydrochloride : The dihydrochloride salt of NNC 55-0396. It is a stable analogue of mibefradil and a highly selective T-type calcium channel blocker. NNC 55-0396: a calcium channel blocker with high selectivity for CaV3 channels over high voltage activated channels; structure in first source | hydrochloride | angiogenesis inhibitor; antineoplastic agent; apoptosis inducer; neuroprotective agent; potassium channel blocker; T-type calcium channel blocker |
| kys 05090 | |||
| ulixacaltamide | Z944: a T-type calcium channel antagonist | benzamides; monochlorobenzenes; monofluorobenzenes; piperidines; secondary carboxamide | non-narcotic analgesic; T-type calcium channel blocker |