store-operated calcium channel activity
Definition
Target type: molecularfunction
A ligand-gated ion channel activity which transports calcium in response to emptying of intracellular calcium stores. [GOC:dph, GOC:tb, PMID:15788710]
Store-operated calcium channels (SOCs) are a type of calcium channel that are activated by the depletion of calcium from intracellular stores. This depletion triggers the opening of the channel, allowing calcium ions to flow into the cell from the extracellular space. SOCs play a critical role in a wide range of cellular processes, including:
1. **Cell signaling:** Calcium is a ubiquitous second messenger that regulates many cellular functions, including gene expression, enzyme activity, and cell growth. SOCs are key players in calcium signaling pathways, as they provide a direct link between the depletion of intracellular calcium stores and the influx of extracellular calcium.
2. **Muscle contraction:** In muscle cells, calcium influx through SOCs is essential for muscle contraction. Depletion of calcium from the sarcoplasmic reticulum (SR), the intracellular calcium store in muscle cells, triggers the opening of SOCs, leading to calcium influx and subsequent muscle contraction.
3. **Exocytosis:** The process of exocytosis, in which cellular vesicles fuse with the plasma membrane and release their contents into the extracellular space, is also regulated by calcium. SOCs contribute to calcium-dependent exocytosis by providing the calcium influx necessary for vesicle fusion.
4. **Immune cell activation:** In immune cells, SOCs play a key role in the activation of immune responses. Calcium influx through SOCs activates signaling pathways that lead to the production of inflammatory cytokines and the activation of immune cells.
5. **Cell growth and differentiation:** SOCs are also involved in cell growth and differentiation. Calcium influx through SOCs can activate signaling pathways that promote cell proliferation and differentiation.
The molecular mechanism of SOC activation involves a complex interplay between several proteins, including stromal interaction molecule 1 (STIM1), Orai1, and TRPC1.
1. **STIM1:** STIM1 is a calcium sensor protein that resides in the ER membrane. When calcium levels in the ER decrease, STIM1 undergoes conformational changes that cause it to cluster at ER-plasma membrane junctions.
2. **Orai1:** Orai1 is a transmembrane protein that forms the pore of the SOC. STIM1 clusters bind to and activate Orai1, leading to the opening of the calcium channel.
3. **TRPC1:** TRPC1 is another calcium channel that can be activated by STIM1. However, the exact mechanism of TRPC1 activation and its role in SOCs are still being investigated.
In summary, SOCs are essential calcium channels that are activated by the depletion of intracellular calcium stores. They play a crucial role in a wide range of cellular processes, including cell signaling, muscle contraction, exocytosis, immune cell activation, and cell growth and differentiation. The molecular mechanism of SOC activation involves a complex interplay between several proteins, including STIM1, Orai1, and TRPC1.'
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Proteins (9)
| Protein | Definition | Taxonomy |
|---|---|---|
| Short transient receptor potential channel 7 | A short transient receptor potential cation channel TRPC7 that is encoded in the genome of human. [PRO:CNA, UniProtKB:Q9HCX4] | Homo sapiens (human) |
| Short transient receptor potential channel 3 | A short transient receptor potential cation channel TRPC3 that is encoded in the genome of human. [PRO:CNA, UniProtKB:Q13507] | Homo sapiens (human) |
| Short transient receptor potential channel 6 | A short transient receptor potential channel 6 that is encoded in the genome of human. [PRO:DNx, UniProtKB:Q9Y210] | Homo sapiens (human) |
| Short transient receptor potential channel 5 | A short transient receptor potential channel 5 that is encoded in the genome of human. [PRO:DNx, UniProtKB:Q9UL62] | Homo sapiens (human) |
| Short transient receptor potential channel 1 | A short transient receptor potential channel 1 that is encoded in the genome of human. [PRO:DNx, UniProtKB:P48995] | Homo sapiens (human) |
| Stromal interaction molecule 2 | A stromal interaction molecule 2 that is encoded in the genome of human. [PRO:DNx, UniProtKB:Q9P246] | Homo sapiens (human) |
| Protein orai-3 | A protein orai-3 that is encoded in the genome of human. [PRO:DNx, UniProtKB:Q9BRQ5] | Homo sapiens (human) |
| Protein orai-2 | A protein orai-2 that is encoded in the genome of human. [PRO:DNx, UniProtKB:Q96SN7] | Homo sapiens (human) |
| Calcium release-activated calcium channel protein 1 | A calcium release-activated calcium channel protein 1 that is encoded in the genome of human. [PRO:DNx, UniProtKB:Q96D31] | Homo sapiens (human) |
Compounds (22)
| Compound | Definition | Classes | Roles |
|---|---|---|---|
| ym 58483 | |||
| clemizole | clemizole : A member of the class of benzimidazoles that is 1H-benzimidazole substituted by a pyrrolidin-1-ylmethyl and a 4-chlorobenzyl groups at positions 2 and 1 respectively. clemizole: was heading 1966-94 (see under BENZIMIDAZOLES 1966-90); use BENZIMIDAZOLES to search CLEMIZOLE 1966-94; a histamine H1- blocker used to treat allergies | benzimidazoles; monochlorobenzenes; pyrrolidines | histamine antagonist |
| diphenhydramine | antitussive : An agent that suppresses cough. Antitussives have a central or a peripheral action on the cough reflex, or a combination of both. Compare with expectorants, which are considered to increase the volume of secretions in the respiratory tract, so facilitating their removal by ciliary action and coughing, and mucolytics, which decrease the viscosity of mucus, facilitating its removal by ciliary action and expectoration. diphenhydramine : An ether that is the benzhydryl ether of 2-(dimethylamino)ethanol. It is a H1-receptor antagonist used as a antipruritic and antitussive drug. Diphenhydramine: A histamine H1 antagonist used as an antiemetic, antitussive, for dermatoses and pruritus, for hypersensitivity reactions, as a hypnotic, an antiparkinson, and as an ingredient in common cold preparations. It has some undesired antimuscarinic and sedative effects. | ether; tertiary amino compound | anti-allergic agent; antidyskinesia agent; antiemetic; antiparkinson drug; antipruritic drug; antitussive; H1-receptor antagonist; local anaesthetic; muscarinic antagonist; oneirogen; sedative |
| econazole | 1-{2-(4-chlorobenzyloxy)-2-(2,4-dichlorophenyl)ethyl}imidazole : A member of the class of imidazoles that is 1-(2,4-dichlorophenyl)-2-(imidazol-1-yl)ethanol in which the hydroxyl hydrogen is replaced by a 4-chlorobenzyl group. econazole : A racemate composed of equimolar amounts of (R)- and (S)-econazole. Used (as its nitrate salt) to treat skin infections such as athlete's foot, jock itch, ringworm and other fungal skin infections. Econazole: An imidazole derivative that is commonly used as a topical antifungal agent. | dichlorobenzene; ether; imidazoles; monochlorobenzenes | |
| miconazole | 1-[2-(2,4-dichlorobenzyloxy)-2-(2,4-dichlorophenyl)ethyl]imidazole : A member of the class of imidazoles that is 1-(2,4-dichlorophenyl)-2-(imidazol-1-yl)ethanol in which the hydroxyl hydrogen is replaced by a 2,4-dichlorobenzyl group. miconazole : A racemate composed of equimolar amounts of (R)- and (S)-miconazole. Used (as its nitrate salt) to treat skin infections such as athlete's foot, jock itch, ringworm and other fungal skin infections. It inhibits the synthesis of ergosterol, a critical component of fungal cell membranes. Miconazole: An imidazole antifungal agent that is used topically and by intravenous infusion. | dichlorobenzene; ether; imidazoles | |
| benzohydrol | diphenylmethanol : A secondary alcohol that is diphenylmethane which carries a hydroxy group at position 1. | benzyl alcohols; secondary alcohol | bacterial xenobiotic metabolite; human urinary metabolite; human xenobiotic metabolite; rat metabolite |
| diphenylborinic acid | diphenylborinic acid: structure given in first source | ||
| mibefradil | Mibefradil: A benzimidazoyl-substituted tetraline that selectively binds and inhibits CALCIUM CHANNELS, T-TYPE. | tetralins | T-type calcium channel blocker |
| methaneboronic acid | |||
| N-butyl-1H-benzimidazol-2-amine | benzimidazoles | ||
| quercetin | 7-hydroxyflavonol; pentahydroxyflavone | antibacterial agent; antineoplastic agent; antioxidant; Aurora kinase inhibitor; chelator; EC 1.10.99.2 [ribosyldihydronicotinamide dehydrogenase (quinone)] inhibitor; geroprotector; phytoestrogen; plant metabolite; protein kinase inhibitor; radical scavenger | |
| apigenin | Chamomile: Common name for several daisy-like plants (MATRICARIA; TRIPLEUROSPERMUM; ANTHEMIS; CHAMAEMELUM) native to Europe and Western Asia, now naturalized in the United States and Australia. | trihydroxyflavone | antineoplastic agent; metabolite |
| luteolin | 3'-hydroxyflavonoid; tetrahydroxyflavone | angiogenesis inhibitor; anti-inflammatory agent; antineoplastic agent; apoptosis inducer; c-Jun N-terminal kinase inhibitor; EC 2.3.1.85 (fatty acid synthase) inhibitor; immunomodulator; nephroprotective agent; plant metabolite; radical scavenger; vascular endothelial growth factor receptor antagonist | |
| kaempferol | 7-hydroxyflavonol; flavonols; tetrahydroxyflavone | antibacterial agent; geroprotector; human blood serum metabolite; human urinary metabolite; human xenobiotic metabolite; plant metabolite | |
| galangin | 5,7-dihydroxyflavonol: antimicrobial from the twigs of Populus nigra x Populus deltoides; structure in first source galangin : A 7-hydroxyflavonol with additional hydroxy groups at positions 3 and 5 respectively; a growth inhibitor of breast tumor cells. | 7-hydroxyflavonol; trihydroxyflavone | antimicrobial agent; EC 3.1.1.3 (triacylglycerol lipase) inhibitor; plant metabolite |
| myricetin | 7-hydroxyflavonol; hexahydroxyflavone | antineoplastic agent; antioxidant; cyclooxygenase 1 inhibitor; food component; geroprotector; hypoglycemic agent; plant metabolite | |
| 4-[3-(4-fluorophenyl)-2-methyl-7-oxo-1H-pyrazolo[1,5-a]pyrimidin-5-yl]-1-piperidinecarboxylic acid ethyl ester | pyrazoles; ring assembly | ||
| englerin a | cinnamate ester; glycolate ester; guaiane sesquiterpenoid | antineoplastic agent; metabolite | |
| gsk-5498a | 2,6-difluoro-N-(1-(2-fluoro-6-(trifluoromethyl)benzyl)-1H-pyrazol-3-yl)benzamide: structure in first source GSK-5498A : A member of the class of pyrazoles that is 1H-pyrazole substituted by 2-fluoro-6-(trifluoromethyl)benzyl and (2,6-difluorobenzoyl)amino groups at positions 1 and 3, respectively. It is a inhibitor of Ca(2+) release-activated Ca(2+) (CRAC) channel and inhibits the release of mast cell mediators and T-cell cytokines in human and rat preparations. | (trifluoromethyl)benzenes; difluorobenzene; pyrazoles; secondary carboxamide | calcium channel blocker |
| teriflunomide | (trifluoromethyl)benzenes; aromatic amide; enamide; enol; nitrile; secondary carboxamide | drug metabolite; EC 1.3.98.1 [dihydroorotate oxidase (fumarate)] inhibitor; hepatotoxic agent; non-steroidal anti-inflammatory drug; tyrosine kinase inhibitor | |
| ethyl 1-(4-(2,3,3-trichloroacrylamido)phenyl)-5-(trifluoromethyl)-1h-pyrazole-4-carboxylate | ethyl 1-(4-(2,3,3-trichloroacrylamido)phenyl)-5-(trifluoromethyl)-1H-pyrazole-4-carboxylate: structure in first source | ||
| gsk-7975a | 2,6-difluoro-N-(1-(4-hydroxy-2-(trifluoromethyl)benzyl)-1H-pyrazol-3-yl)benzamide: structure in first source |