Page last updated: 2024-10-24

ligand-gated calcium channel activity

Definition

Target type: molecularfunction

Enables the transmembrane transfer of a calcium ions by a channel that opens when a specific ligand has been bound by the channel complex or one of its constituent parts. [GOC:dos]

Ligand-gated calcium channels (LGCCs) are transmembrane proteins that mediate calcium influx across the plasma membrane in response to the binding of a specific ligand. These channels play crucial roles in a wide range of cellular processes, including neurotransmission, muscle contraction, hormone secretion, and cell signaling.

The molecular function of LGCC activity involves a series of intricate steps:

1. **Ligand Binding:** The process begins with the binding of a specific ligand to the extracellular domain of the LGCC. This binding event triggers a conformational change in the channel protein, initiating the opening of the pore.
2. **Channel Opening:** Upon ligand binding, the channel undergoes a conformational shift that allows the passage of calcium ions through the pore. The opening of the channel is highly regulated and typically occurs within milliseconds of ligand binding.
3. **Calcium Influx:** Once the channel is open, calcium ions flow down their electrochemical gradient, moving from the extracellular space into the intracellular compartment. This influx of calcium triggers a cascade of intracellular signaling events.
4. **Channel Closure:** The channel remains open for a brief period before closing, typically in the range of milliseconds to seconds. The closure of the channel is essential for maintaining calcium homeostasis and preventing excessive calcium influx.

The specific ligands that activate LGCCs vary depending on the channel subtype. For example, acetylcholine activates nicotinic acetylcholine receptors (nAChRs), glutamate activates NMDA receptors, and GABA activates GABA receptors.

The molecular function of LGCC activity is highly regulated and influenced by factors such as membrane potential, intracellular calcium concentration, and phosphorylation state of the channel protein. These regulatory mechanisms ensure that calcium influx occurs in a controlled and timely manner, allowing for precise control of cellular processes.

Overall, LGCC activity is a complex and dynamic process that involves the coordinated interplay of multiple molecular events. This intricate mechanism plays a vital role in maintaining cellular function and mediating a wide range of physiological processes.'
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Proteins (5)

ProteinDefinitionTaxonomy
Transient receptor potential cation channel subfamily M member 8A transient receptor potential cation channel TRPM8 that is encoded in the genome of human. [PRO:CNA, UniProtKB:Q7Z2W7]Homo sapiens (human)
Transient receptor potential cation channel subfamily M member 4A transient receptor potential cation channel subfamily M member 4 that is encoded in the genome of human. [PRO:DNx, UniProtKB:Q8TD43]Homo sapiens (human)
P2X purinoceptor 4A P2X purinoceptor 4 that is encoded in the genome of human. [PRO:DNx, UniProtKB:Q99571]Homo sapiens (human)
P2X purinoceptor 1A P2X purinoceptor 1 that is encoded in the genome of human. [PRO:DNx, UniProtKB:P51575]Homo sapiens (human)
Transient receptor potential cation channel subfamily M member 2A transient receptor potential cation channel subfamily M member 2 that is encoded in the genome of human. [PRO:DNx, UniProtKB:O94759]Homo sapiens (human)

Compounds (56)

CompoundDefinitionClassesRoles
pyridoxal phosphatepyridoxal 5'-phosphate : The monophosphate ester obtained by condensation of phosphoric acid with the primary hydroxy group of pyridoxal.

Pyridoxal Phosphate: This is the active form of VITAMIN B 6 serving as a coenzyme for synthesis of amino acids, neurotransmitters (serotonin, norepinephrine), sphingolipids, aminolevulinic acid. During transamination of amino acids, pyridoxal phosphate is transiently converted into pyridoxamine phosphate (PYRIDOXAMINE).
methylpyridines;
monohydroxypyridine;
pyridinecarbaldehyde;
vitamin B6 phosphate
coenzyme;
cofactor;
EC 2.7.7.7 (DNA-directed DNA polymerase) inhibitor;
Escherichia coli metabolite;
human metabolite;
mouse metabolite;
Saccharomyces cerevisiae metabolite
mentholMenthol: A monoterpene cyclohexanol produced from mint oils.p-menthane monoterpenoid;
secondary alcohol
volatile oil component
2-aminoethoxydiphenyl borate2-aminoethoxydiphenyl borate: is a novel membrane-penetrable modulator and transient receptor potential channel blocker; structure in first source; do not confuse with 2-APB cpd

2-aminoethoxydiphenylborane : An organoboron compound that is diphenylborane in which the borane hydrogen is replaced by a 2-aminoethoxy group.
organoboron compound;
primary amino compound
calcium channel blocker;
IP3 receptor antagonist;
potassium channel opener
5-methoxytryptamine5-methoxytryptamine : A member of the class of tryptamines that is the methyl ether derivative of serotonin.

5-Methoxytryptamine: Serotonin derivative proposed as potentiator for hypnotics and sedatives.
aromatic ether;
primary amino compound;
tryptamines
5-hydroxytryptamine 2A receptor agonist;
5-hydroxytryptamine 2B receptor agonist;
5-hydroxytryptamine 2C receptor agonist;
antioxidant;
cardioprotective agent;
human metabolite;
mouse metabolite;
neuroprotective agent;
radiation protective agent;
serotonergic agonist
carbamazepinecarbamazepine : A dibenzoazepine that is 5H-dibenzo[b,f]azepine carrying a carbamoyl substituent at the azepine nitrogen, used as an anticonvulsant.

Carbamazepine: A dibenzazepine that acts as a sodium channel blocker. It is used as an anticonvulsant for the treatment of grand mal and psychomotor or focal SEIZURES. It may also be used in the management of BIPOLAR DISORDER, and has analgesic properties.
dibenzoazepine;
ureas
analgesic;
anticonvulsant;
antimanic drug;
drug allergen;
EC 3.5.1.98 (histone deacetylase) inhibitor;
environmental contaminant;
glutamate transporter activator;
mitogen;
non-narcotic analgesic;
sodium channel blocker;
xenobiotic
carbamazepine epoxidecarbamazepine epoxide: metabolite of carbamazepine; RN given refers to unlabeled cpd

carbamazepine-10,11-epoxide : An epoxide and metabolite of carbamazepine.
dibenzoazepine;
epoxide;
ureas
allergen;
drug metabolite;
marine xenobiotic metabolite
eucalyptol
clotrimazoleconazole antifungal drug;
imidazole antifungal drug;
imidazoles;
monochlorobenzenes
antiinfective agent;
environmental contaminant;
xenobiotic
econazole1-{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
flufenamic acidflufenamic acid : An aromatic amino acid consisting of anthranilic acid carrying an N-(trifluoromethyl)phenyl substituent. An analgesic and anti-inflammatory, it is used in rheumatic disorders.

Flufenamic Acid: An anthranilic acid derivative with analgesic, anti-inflammatory, and antipyretic properties. It is used in musculoskeletal and joint disorders and administered by mouth and topically. (From Martindale, The Extra Pharmacopoeia, 30th ed, p16)
aromatic amino acid;
organofluorine compound
antipyretic;
EC 1.14.99.1 (prostaglandin-endoperoxide synthase) inhibitor;
non-narcotic analgesic;
non-steroidal anti-inflammatory drug
mefenamic acidmefenamic acid : An aminobenzoic acid that is anthranilic acid in which one of the hydrogens attached to the nitrogen is replaced by a 2,3-dimethylphenyl group. Although classed as a non-steroidal anti-inflammatory drug, its anti-inflammatory properties are considered to be minor. It is used to relieve mild to moderate pain, including headaches, dental pain, osteoarthritis and rheumatoid arthritis.

Mefenamic Acid: A non-steroidal anti-inflammatory agent with analgesic, anti-inflammatory, and antipyretic properties. It is an inhibitor of cyclooxygenase.
aminobenzoic acid;
secondary amino compound
analgesic;
antipyretic;
antirheumatic drug;
EC 1.14.99.1 (prostaglandin-endoperoxide synthase) inhibitor;
environmental contaminant;
non-steroidal anti-inflammatory drug;
xenobiotic
niflumic acidNiflumic Acid: An analgesic and anti-inflammatory agent used in the treatment of rheumatoid arthritis.aromatic carboxylic acid;
pyridines
pyridoxal phosphate-6-azophenyl-2',4'-disulfonic acid5'-phosphopyridoxal-6-azobenzene-2,4-disulfonic acid : An arenesulfonic acid that is pyridoxal 5'-phosphate carrying an additional 2,4-disulfophenylazo substituent at position 6.

pyridoxal phosphate-6-azophenyl-2',4'-disulfonic acid: a novel antagonist that selectively blocks P2 purinoceptor receptors; a useful tool to study co-transmission in tissues when ATP and coexisting neurotransmitters act in concert
arenesulfonic acid;
azobenzenes;
methylpyridines;
monohydroxypyridine;
organic phosphate;
pyridinecarbaldehyde
purinergic receptor P2X antagonist
adenosine diphosphateAdenosine Diphosphate: Adenosine 5'-(trihydrogen diphosphate). An adenine nucleotide containing two phosphate groups esterified to the sugar moiety at the 5'-position.adenosine 5'-phosphate;
purine ribonucleoside 5'-diphosphate
fundamental metabolite;
human metabolite
adenosine monophosphateAdenosine Monophosphate: Adenine nucleotide containing one phosphate group esterified to the sugar moiety in the 2'-, 3'-, or 5'-position.adenosine 5'-phosphate;
purine ribonucleoside 5'-monophosphate
adenosine A1 receptor agonist;
cofactor;
EC 3.1.3.1 (alkaline phosphatase) inhibitor;
EC 3.1.3.11 (fructose-bisphosphatase) inhibitor;
fundamental metabolite;
micronutrient;
nutraceutical
9-phenanthrol9-phenanthrol : A phenanthrol that is phenanthrene in which a hydrogen attached to a carbon in the central ring has been replaced by a hydroxy group.

9-phenanthrol: an inhibitor of AMP-dependent protein kinase catalytic subunit; structure in first source
phenanthrolTRPM4 channel inhibitor
menthol(-)-menthol : A p-menthan-3-ol which has (1R,2S,5R)-stereochemistry. It is the most common naturally occurring enantiomer.

(+-)-menthol : A racemate comprising equimolar amounts of (+)- and (-)-menthol. Both (+-)- and (-)-menthol are used to relieve symptoms of conditions such as bronchitis and sinusitis. When applied to the skin, menthol dilates the blood vessels, giving a sensation of coldness followed by an analgesic effect that relieves itching. It is therefore used in creams and ointments for the relief of pruritis and urticaria.
p-menthan-3-olantipruritic drug;
antispasmodic drug;
antitussive
10,11-dihydrocarbamazepine
diadenosine tetraphosphateP(1),P(4)-bis(5'-adenosyl) tetraphosphate : A diadenosyl tetraphosphate compound having the two 5'-adenosyl residues attached at the P(1)- and P(4)-positions.diadenosyl tetraphosphateEscherichia coli metabolite;
mouse metabolite
arylid
cannabichromene1-benzopyran
adenosine diphosphate riboseAdenosine Diphosphate Ribose: An ester formed between the aldehydic carbon of RIBOSE and the terminal phosphate of ADENOSINE DIPHOSPHATE. It is produced by the hydrolysis of nicotinamide-adenine dinucleotide (NAD) by a variety of enzymes, some of which transfer an ADP-ribosyl group to target proteins.ADP-sugarEscherichia coli metabolite;
mouse metabolite
oxcarbazepineoxcarbazepine : A dibenzoazepine derivative, having a carbamoyl group at the ring nitrogen, substituted with an oxo group at C-4 of the azepeine ring which is also hydrogenated at C-4 and C-5. It is a anticholinergic anticonvulsant and mood stabilizing drug, used primarily in the treatment of epilepsy.

Oxcarbazepine: A carbamazepine derivative that acts as a voltage-gated sodium channel blocker. It is used for the treatment of PARTIAL SEIZURES with or without secondary generalization. It is also an inducer of CYTOCHROME P-450 CYP3A4.
cyclic ketone;
dibenzoazepine
anticonvulsant;
drug allergen
paroxetineparoxetine : 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
9-chloroacridine9-chloroacridine: chromogenic reagent for detection of arylhydroxylamines & arylamines on paper & thin layer chromatograms; structure
5-chlorotryptamine
5-benzyloxytryptamine
5'-adenylyl (beta,gamma-methylene)diphosphonate5'-adenylyl (beta,gamma-methylene)diphosphonate: do not confuse with alpha,beta-methyleneadenosine 5'-triphosphatenucleoside triphosphate analogue
alpha,beta-methyleneadenosine 5'-triphosphatealpha,beta-methyleneadenosine 5'-triphosphate: do not confuse with beta,gamma-methylene ATP; RN given refers to parent cpdnucleoside triphosphate analogue
(6ar-trans)-isomer of tetrahydrocannabivarin 9
10-hydroxycarbamazepine10,11-dihydro-10-hydroxycarbamazepine: main metabolite of oxcarbazepine; structure given in first source

licarbazepine : A dibenzoazepine that is 5H-dibenzo[b,f]azepine, reduced across the C-10,11 positions and carrying a carbamoyl substituent at the azepine nitrogen and a hydroxy function at C-10. A voltage-gated sodium channel blocker with anticonvulsant and mood-stabilizing effects, it is related to oxcarbazepine and is an active metabolite of oxcarbazepine.
carboxamide;
dibenzoazepine;
ureas
anticonvulsant;
drug allergen;
sodium channel blocker
ag 3-5icilin: a cooling compound that activates TRPM8C-nitro compound
5-fluorotryptamine5-fluorotryptamine: RN given refers to parent cpd
eslicarbazepine acetateeslicarbazepine acetate : The acetate ester, with S configuration, of licarbazepine. An anticonvulsant, it is approved for use in Europe and the United States as an adjunctive therapy for epilepsy.acetate ester;
carboxamide;
dibenzoazepine;
ureas
anticonvulsant;
drug allergen
adenosine 5'-o-(3-thiotriphosphate)adenosine 5'-[gamma-thio]triphosphate : A nucleoside triphosphate analogue that is ATP in which one of the oxygens attached to 3-phosphate group is replaced by sulfur.

adenosine 5'-O-(3-thiotriphosphate): RN given refers to cpd with unspecified locant for thio group; see also records for 1-thio & 2-thio-isomers
nucleoside triphosphate analogue
1-(5H-dibenzo[b,f]azepin-5-yl)ethan-1-onedibenzooxazepine
geraniol3,7-dimethylocta-2,6-dien-1-ol;
monoterpenoid;
primary alcohol
allergen;
fragrance;
plant metabolite;
volatile oil component
sb 366791N-(3-methoxyphenyl)-4-chlorocinnamanilide: a TRPV1 antagonist; structure in first source
hc 0300312-(1,3-dimethyl-2,6-dioxo-1,2,3,6-tetrahydro-7H-purin-7-yl)-N-(4-isopropylphenyl)acetamide: a TRPA1 channel blocker
capsazepinecapsazepine : A benzazepine that is 2,3,4,5-tetrahydro-1H-2-benzazepine which is substituted by hydroxy groups at positions 7 and 8 and on the nitrogen atom by a 2-(p-chlorophenyl)ethylaminothiocarbonyl group. A synthetic analogue of capsaicin, it was the first reported capsaicin receptor antagonist.

capsazepine: modified capsaicin molecule; a capsaicin receptor antagonist
benzazepine;
catechols;
monochlorobenzenes;
thioureas
capsaicin receptor antagonist
8-azidoadenosine 5'-triphosphate
6-thioinosine-5'-triphosphateorganic molecule
imd 0354N-(3,5-bis(trifluoromethyl)phenyl)-5-chloro-2-hydroxybenzamide: a cardioprotective agent that inhibits IkappaB kinase beta (IKKbeta); structure in first sourcebenzamides
2-methylthio-atp2-methylthio-ATP: purinergic receptors agonist; relaxes mammalian gut preparations; structure given in first source
adp beta sadenosine 5'-O-(2-thiodiphosphate): partial agonist toward platelet aggregation; see also record for 1-thiodiphosphate cpd
kn 62KN 62: inhibitor of Ca/calmodulin-dependent protein kinase IIpiperazines
cannabigerolcannabigerol : A member of the class of resorcinols that is resorcinol which is substituted by a (2E)-3,7-dimethylocta-2,6-dien-1-yl group at position 2 and by a pentyl group at position 5. It is a natural product found in Cannabis sativa and Helichrysum species.

cannabigerol: RN given refers to (E)-isomer; structure given in first source
phytocannabinoid;
resorcinols
anti-inflammatory agent;
antibacterial agent;
antioxidant;
appetite enhancer;
cannabinoid receptor agonist;
neuroprotective agent;
plant metabolite
4-amylcinnamoylanthranilic acid4-amylcinnamoylanthranilic acid: phospholipase A2 inhibitor

N-(p-amylcinnamoyl)anthranilic acid : An amidobenzoic acid that is anthranilic acid in which one of the anilino hydrogens is replaced by a 4-pentylcinnamoyl group. It is a transient receptor potential (TRP) channel blocker and phospholipase A2 (PLA2) inhibitor.
amidobenzoic acid;
cinnamamides;
secondary carboxamide
EC 3.1.1.4 (phospholipase A2) inhibitor;
TRP channel blocker
nf023
nf 449
sb 705498SB 705498: structure in first source
n-(4-tert-butylphenyl)-4-(3-chloropyridin-2-yl)tetrahydropyrazine-1(2h)-carboxamideN-(4-tert-butylphenyl)-4-(3-chloropyridin-2-yl)tetrahydropyrazine-1(2H)-carboxamide: a vanilloid receptor 1 antagonist and analgesic; structure in first sourcepiperazines;
pyridines
3,4-dihydro-5-(4-(1-piperidinyl)butoxy)-1(2h)-isoquinolinone
cannabidivarincannabidivarin: from Cannabis sativamonoterpenoid
af 3535-(5-iodo-2-isopropyl-4-methoxyphenoxy)pyrimidine-2,4-diamine: a P2X3 and P2X2/3 receptor antagonist; structure in first source
scalaradialscalaradial : A scalarane sesterterpenoid with formula C27H40O4. It is a natural product found in the marine sponges Spongia officinalis and Cacospongia mollior, and exhibits anti-inflammatory activity.

scalaradial: RN refers to the (5alpha,12alpha,17abeta)-isomer; a marine natural product isolated from the sponge Cacospongia sp.; structure given in first source
acetate ester;
carbotetracyclic compound;
dialdehyde;
enal;
scalarane sesterterpenoid
animal metabolite;
anti-inflammatory agent;
apoptosis inducer;
EC 3.1.1.4 (phospholipase A2) inhibitor;
marine metabolite;
TRP channel blocker