Target type: molecularfunction
Enables the transmembrane transfer of a potassium ion by an outwardly-rectifying voltage-gated channel that produces a transient outward current upon a step change in membrane potential. [GOC:mah, PMID:5575340]
A-type potassium channels, also known as transient outward potassium channels, play a crucial role in regulating the excitability of neurons and other excitable cells. They are characterized by their rapid activation and inactivation kinetics, contributing to the repolarization phase of action potentials and the shaping of action potential waveforms. The molecular function of A-type potassium channel activity involves the selective and rapid movement of potassium ions (K+) across the cell membrane. This movement is driven by the electrochemical gradient, with potassium ions flowing out of the cell when the channel is open. The opening and closing of A-type potassium channels are regulated by changes in membrane potential. When the membrane potential depolarizes, the channels open, allowing potassium ions to flow out of the cell and contribute to repolarization. Conversely, when the membrane potential hyperpolarizes, the channels close, reducing potassium permeability. The inactivation of A-type potassium channels is a voltage-dependent process that occurs rapidly after the channels open. This inactivation is responsible for the transient nature of A-type currents and contributes to the refractory period following an action potential. Inactivation is caused by a conformational change in the channel protein, which blocks the flow of potassium ions. The precise mechanism of inactivation varies between different A-type potassium channel subtypes. A-type potassium channels are encoded by a family of genes, including Kv4, Kv1, and Kv3. Different subtypes of A-type channels exhibit variations in their biophysical properties, such as activation and inactivation kinetics, and their expression patterns vary in different tissues and cell types. These variations contribute to the diverse roles of A-type potassium channels in regulating neuronal excitability, controlling action potential firing rates, and influencing synaptic transmission.'
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| Protein | Definition | Taxonomy |
|---|---|---|
| Potassium voltage-gated channel subfamily D member 1 | A voltage-gated potassium channel KCND1 that is encoded in the genome of human. [PRO:CNA, UniProtKB:Q9NSA2] | Homo sapiens (human) |
| Potassium voltage-gated channel subfamily D member 3 | A voltage-gated potassium channel KCND3 that is encoded in the genome of human. [PRO:CNA, UniProtKB:Q9UK17] | Homo sapiens (human) |
| Potassium voltage-gated channel subfamily D member 2 | A voltage-gated potassium channel KCND2 that is encoded in the genome of human. [PRO:CNA, UniProtKB:Q9NZV8] | Homo sapiens (human) |
| Compound | Definition | Classes | Roles |
|---|---|---|---|
| N-(2-aminoethyl)-5-chloro-1-naphthalenesulfonamide | naphthalenes; sulfonic acid derivative | ||
| alfuzosin | alfuzosin: structure given in first source | monocarboxylic acid amide; quinazolines; tetrahydrofuranol | alpha-adrenergic antagonist; antihypertensive agent; antineoplastic agent |
| duloxetine | duloxetine | ||
| nelfinavir | nelfinavir : An aryl sulfide that is used (as its mesylate salt) for treatment of HIV and also exhibits some anticancer properties. Nelfinavir: A potent HIV protease inhibitor. It is used in combination with other antiviral drugs in the treatment of HIV in both adults and children. | aryl sulfide; benzamides; organic heterobicyclic compound; phenols; secondary alcohol; tertiary amino compound | antineoplastic agent; HIV protease inhibitor |
| nebivolol | 2,2'-iminobis[1-(6-fluoro-3,4-dihydro-2H-chromen-2-yl)ethanol] : A member of the class of chromanes that is 2,2'-iminodiethanol in which one hydrogen attached to each hydroxy-bearing carbon is replaced by a 6-fluorochroman-2-yl group. | chromanes; diol; organofluorine compound; secondary alcohol; secondary amino compound | |
| paliperidone | 3-{2-[4-(6-fluoro-1,2-benzoxazol-3-yl)piperidin-1-yl]ethyl}-9-hydroxy-2-methyl-6,7,8,9-tetrahydropyrido[1,2-a]pyrimidin-4-one : A member of the class of pyridopyrimidines that is 9-hydroxy-2-methyl-6,7,8,9-tetrahydropyrido[1,2-a]pyrimidin-4-one carrying an additional 2-[4-(6-fluoro-1,2-benzoxazol-3-yl)piperidin-1-yl]ethyl group at position 2. paliperidone : A racemate comprising equimolar amounts of (R)- and (S)-paliperidone. Paliperidone is the primary active metabolite of the older antipsychotic risperidone and is used for treatment of schizophrenia. | 1,2-benzoxazoles; heteroarylpiperidine; organofluorine compound; pyridopyrimidine; secondary alcohol | |
| desvenlafaxine | O-desmethylvenlafaxine : A tertiary amino compound that is N,N-dimethylethanamine substituted at position 1 by a 1-hydroxycyclohexyl and 4-hydroxyphenyl group. It is a metabolite of the drug venlafaxine. | cyclohexanols; phenols; tertiary amino compound | antidepressant; drug metabolite; marine xenobiotic metabolite |
| solifenacin | isoquinolines | ||
| etravirine | aminopyrimidine; aromatic ether; dinitrile; organobromine compound | antiviral agent; HIV-1 reverse transcriptase inhibitor | |
| darunavir | darunavir : An N,N-disubstituted benzenesulfonamide bearing an unsubstituted amino group at the 4-position, used for the treatment of HIV infection. A second-generation HIV protease inhibitor, darunavir was designed to form robust interactions with the protease enzyme from many strains of HIV, including those from treatment-experienced patients with multiple resistance mutations to other protease inhibitors. Darunavir: An HIV PROTEASE INHIBITOR that is used in the treatment of AIDS and HIV INFECTIONS. Due to the emergence of ANTIVIRAL DRUG RESISTANCE when used alone, it is administered in combination with other ANTI-HIV AGENTS. | carbamate ester; furofuran; sulfonamide | antiviral drug; HIV protease inhibitor |
| deferasirox | deferasirox : A member of the class of triazoles, deferasirox is 1,2,4-triazole substituted by a 4-carboxyphenyl group at position 1 and by 2-hydroxyphenyl groups at positions 3 and 5. An orally active iron chelator, it is used to manage chronic iron overload in patients receiving long-term blood transfusions. Deferasirox: A triazole and benzoate derivative that acts as a selective iron chelator. It is used in the management of chronic IRON OVERLOAD due to blood transfusion or non-transfusion dependent THALASSEMIA. | benzoic acids; monocarboxylic acid; phenols; triazoles | iron chelator |
| tolterodine | tertiary amine | antispasmodic drug; muscarinic antagonist; muscle relaxant | |
| darifenacin | darifenacin : 2-[(3S)-1-Ethylpyrrolidin-3-yl]-2,2-diphenylacetamide in which one of the hydrogens at the 2-position of the ethyl group is substituted by a 2,3-dihydro-1-benzofuran-5-yl group. It is a selective antagonist for the M3 muscarinic acetylcholine receptor, which is primarily responsible for bladder muscle contractions, and is used as the hydrobromide salt in the management of urinary incontinence. | 1-benzofurans; monocarboxylic acid amide; pyrrolidines | antispasmodic drug; muscarinic antagonist |
| s 1033 | (trifluoromethyl)benzenes; imidazoles; pyridines; pyrimidines; secondary amino compound; secondary carboxamide | anticoronaviral agent; antineoplastic agent; tyrosine kinase inhibitor | |
| dasatinib | dasatinib (anhydrous) : An aminopyrimidine that is 2-methylpyrimidine which is substituted at position 4 by the primary amino group of 2-amino-1,3-thiazole-5-carboxylic acid and at position 6 by a 4-(2-hydroxyethyl)piperazin-1-yl group, and in which the carboxylic acid group has been formally condensed with 2-chloro-6-methylaniline to afford the corresponding amide. A multi-targeted kinase inhibitor, it is used, particularly as the monohydrate, for the treatment of chronic, accelerated, or myeloid or lymphoid blast phase chronic myeloid leukemia. Note that the name 'dasatinib' is used to refer to the monohydrate (USAN) as well as to anhydrous dasatinib (INN). N-(2-chloro-6-methylphenyl)-2-((6-(4-(2-hydroxyethyl)piperazin-1-yl)-2-methylpyrimidin-4-yl)amino)-1,3-thiazole-5-carboxamide: a dasatinib prodrug; structure in first source | 1,3-thiazoles; aminopyrimidine; monocarboxylic acid amide; N-(2-hydroxyethyl)piperazine; N-arylpiperazine; organochlorine compound; secondary amino compound; tertiary amino compound | anticoronaviral agent; antineoplastic agent; tyrosine kinase inhibitor |
| sitagliptin | sitagliptin : A triazolopyrazine that exhibits hypoglycemic activity. | triazolopyrazine; trifluorobenzene | EC 3.4.14.5 (dipeptidyl-peptidase IV) inhibitor; environmental contaminant; hypoglycemic agent; serine proteinase inhibitor; xenobiotic |
| acacetin | 5,7-dihydroxy-4'-methoxyflavone : A monomethoxyflavone that is the 4'-methyl ether derivative of apigenin. | dihydroxyflavone; monomethoxyflavone | anticonvulsant; plant metabolite |
| silodosin | silodosin: an alpha(1a)-adrenoceptor-selective antagonist; structure given in first source | indolecarboxamide | |
| su 11248 | monocarboxylic acid amide; pyrroles | angiogenesis inhibitor; antineoplastic agent; EC 2.7.10.1 (receptor protein-tyrosine kinase) inhibitor; immunomodulator; neuroprotective agent; vascular endothelial growth factor receptor antagonist | |
| everolimus | cyclic acetal; cyclic ketone; ether; macrolide lactam; primary alcohol; secondary alcohol | anticoronaviral agent; antineoplastic agent; geroprotector; immunosuppressive agent; mTOR inhibitor | |
| 6-cyano-4-(n-ethylsulfonyl-n-methylamino)-3-hydroxy-2,2-dimethylchromane, (trans-(+))-isomer | |||
| lu 208075 | ambrisentan: an ET(A) receptor antagonist and antihypertensive agent; studied for use in pulmonary arterial hypertension | diarylmethane | |
| raltegravir | 1,2,4-oxadiazole; dicarboxylic acid amide; hydroxypyrimidine; monofluorobenzenes; pyrimidone; secondary carboxamide | antiviral drug; HIV-1 integrase inhibitor | |
| sildenafil | sildenafil : A pyrazolo[4,3-d]pyrimidin-7-one having a methyl substituent at the 1-position, a propyl substituent at the 3-position and a 2-ethoxy-5-[(4-methylpiperazin-1-yl)sulfonyl]phenyl group at the 5-position. | piperazines; pyrazolopyrimidine; sulfonamide | EC 3.1.4.35 (3',5'-cyclic-GMP phosphodiesterase) inhibitor; vasodilator agent |
| vardenafil | vardenafil : The sulfonamide resulting from formal condensation of the sulfo group of 4-ethoxy-3-(5-methyl-7-propylimidazo[5,1-f][1,2,4]triazin-4(1H)-one-2-yl)benzenesulfonic acid and the secondary amino group of 4-ethylpiperazine. | imidazotriazine; N-alkylpiperazine; N-sulfonylpiperazine | EC 3.1.4.* (phosphoric diester hydrolase) inhibitor; vasodilator agent |
| amg531 |