detection of calcium ion
Definition
Target type: biologicalprocess
The series of events in which a calcium ion stimulus is received by a cell and converted into a molecular signal. [GOC:pg]
Calcium ion detection is a fundamental biological process that plays a vital role in various cellular functions. It involves the precise sensing and signaling of changes in intracellular calcium ion concentration, triggering a cascade of events that ultimately lead to specific cellular responses.
The detection of calcium ions relies on specialized proteins known as calcium sensors, which are highly sensitive to changes in calcium levels. These proteins can be categorized into two main groups:
1. **Calcium-binding proteins:** These proteins directly bind to calcium ions, exhibiting a high affinity and specificity for the ion. Examples include calmodulin, troponin C, and parvalbumin. Upon calcium binding, these proteins undergo conformational changes, altering their activity and enabling interactions with other signaling molecules.
2. **Calcium channels:** These membrane proteins act as gated pores that allow calcium ions to flow across cell membranes. They are crucial for regulating calcium influx and efflux, maintaining intracellular calcium homeostasis. Examples include voltage-gated calcium channels, ligand-gated calcium channels, and store-operated calcium channels.
The process of calcium ion detection typically involves the following steps:
1. **Calcium influx:** Calcium ions enter the cell through various pathways, including calcium channels, receptor-mediated endocytosis, and passive diffusion.
2. **Calcium binding:** Once inside the cell, calcium ions bind to calcium sensors, triggering conformational changes in these proteins.
3. **Signal transduction:** The conformational changes in calcium sensors initiate a cascade of downstream signaling events. These events can involve activation of enzymes, such as kinases and phosphatases, activation of transcription factors, or triggering of muscle contraction.
4. **Calcium efflux:** To maintain calcium homeostasis, calcium ions are actively pumped out of the cell through various mechanisms, such as calcium ATPases and sodium-calcium exchangers.
The detection of calcium ions is crucial for various cellular processes, including:
- **Muscle contraction:** Calcium binding to troponin C triggers muscle contraction.
- **Neurotransmitter release:** Calcium influx at presynaptic terminals triggers the release of neurotransmitters.
- **Gene expression:** Calcium signaling pathways can regulate gene transcription and protein synthesis.
- **Cell proliferation and differentiation:** Calcium plays a role in controlling cell growth and development.
- **Apoptosis:** Calcium signaling can trigger programmed cell death.
The precise mechanisms of calcium ion detection and signaling can vary depending on the cell type and the specific physiological context. However, the fundamental principles of calcium binding, signal transduction, and calcium homeostasis remain consistent across different biological systems.
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Proteins (6)
| Protein | Definition | Taxonomy |
|---|---|---|
| Extracellular calcium-sensing receptor | An extracellular calcium-sensing receptor that is encoded in the genome of cow. [OMA:P35384, PRO:DNx] | Bos taurus (cattle) |
| Calcium-activated potassium channel subunit beta-1 | A calcium-activated potassium channel subunit beta-1 that is encoded in the genome of human. [PRO:DNx, UniProtKB:Q16558] | Homo sapiens (human) |
| Ryanodine receptor 2 | A ryanodine receptor 2 that is encoded in the genome of human. [PRO:DNx, UniProtKB:Q92736] | Homo sapiens (human) |
| Stromal interaction molecule 1 | A stromal interaction molecule 1 that is encoded in the genome of human. [PRO:DNx, UniProtKB:Q13586] | Homo sapiens (human) |
| Extracellular calcium-sensing receptor | An extracellular calcium-sensing receptor that is encoded in the genome of human. [PRO:DNx, UniProtKB:P41180] | Homo sapiens (human) |
| Calmodulin-1 | A calmodulin (human) that is a translation product of the CALM1 gene. [PRO:DAN, UniProtKB:P0DP23] | Homo sapiens (human) |
Compounds (28)
| Compound | Definition | Classes | Roles |
|---|---|---|---|
| chlorpromazine | chlorpromazine : A substituted phenothiazine in which the ring nitrogen at position 10 is attached to C-3 of an N,N-dimethylpropanamine moiety. Chlorpromazine: The prototypical phenothiazine antipsychotic drug. Like the other drugs in this class chlorpromazine's antipsychotic actions are thought to be due to long-term adaptation by the brain to blocking DOPAMINE RECEPTORS. Chlorpromazine has several other actions and therapeutic uses, including as an antiemetic and in the treatment of intractable hiccup. | organochlorine compound; phenothiazines; tertiary amine | anticoronaviral agent; antiemetic; dopaminergic antagonist; EC 3.4.21.26 (prolyl oligopeptidase) inhibitor; phenothiazine antipsychotic drug |
| fendiline | Fendiline: Coronary vasodilator; inhibits calcium function in muscle cells in excitation-contraction coupling; proposed as antiarrhythmic and antianginal agents. | diarylmethane | |
| ns 1619 | NS 1619 : A member of the class of benzimidazoles that is 1,3-dihydro-2H-benzimidazol-2-one in which the hydrogens at positions 1 and 5 are replaced are replaced by 2-hydroxy-5-(trifluoromethyl)phenyl and trifluoromethyl groups, respectively. It is an opener/activator of the large-conductance calcium-activated potassium channel (Bkca). NS 1619: structure given in first source | (trifluoromethyl)benzenes; benzimidazoles; phenols | potassium channel opener |
| promethazine | promethazine : A tertiary amine that is a substituted phenothiazine in which the ring nitrogen at position 10 is attached to C-3 of an N,N-dimethylpropan-2-amine moiety. Promethazine: A phenothiazine derivative with histamine H1-blocking, antimuscarinic, and sedative properties. It is used as an antiallergic, in pruritus, for motion sickness and sedation, and also in animals. | phenothiazines; tertiary amine | anti-allergic agent; anticoronaviral agent; antiemetic; antipruritic drug; H1-receptor antagonist; local anaesthetic; sedative |
| trifluoperazine | N-alkylpiperazine; N-methylpiperazine; organofluorine compound; phenothiazines | antiemetic; calmodulin antagonist; dopaminergic antagonist; EC 1.8.1.12 (trypanothione-disulfide reductase) inhibitor; EC 5.3.3.5 (cholestenol Delta-isomerase) inhibitor; phenothiazine antipsychotic drug | |
| diphenylmethane | diphenylmethane : A diarylmethane that is methane substituted by two phenyl groups. | diarylmethane | |
| hesperidin | hesperidin : A disaccharide derivative that consists of hesperetin substituted by a 6-O-(alpha-L-rhamnopyranosyl)-beta-D-glucopyranosyl moiety at position 7 via a glycosidic linkage. Hesperidin: A flavanone glycoside found in CITRUS fruit peels. | 3'-hydroxyflavanones; 4'-methoxyflavanones; dihydroxyflavanone; disaccharide derivative; flavanone glycoside; monomethoxyflavanone; rutinoside | mutagen |
| flavone | flavone : The simplest member of the class of flavones that consists of 4H-chromen-4-one bearing a phenyl substituent at position 2. flavone: RN given refers to unlabeled cpd; structure given in first source | flavones | metabolite; nematicide |
| 3-hydroxyflavone | 3-hydroxyflavone: structure given in first source flavonol : A monohydroxyflavone that is the 3-hydroxy derivative of flavone. | flavonols; monohydroxyflavone | |
| 6-hydroxyflavone | 6-hydroxyflavone: antioxidant; structure in first source | hydroxyflavonoid | |
| cinacalcet hydrochloride | cinacalcet hydrochloride : A hydrochloride derived from equimolar amounts of cinacalcet and hydrogen chloride. Cinacalcet Hydrochloride: A naphthalene derivative and CALCIMIMETIC AGENT that increases the sensitivity of PARATHYROID GLAND calcium-sensing receptors to serum calcium. This action reduces parathyroid hormone secretion and decreases serum calcium in the treatment of PARATHYROID DISEASES. | hydrochloride | calcimimetic; P450 inhibitor |
| cinacalcet | cinacalcet : A secondary amino compound that is (1R)-1-(naphthalen-1-yl)ethanamine in which one of the hydrogens attached to the nitrogen is substituted by a 3-[3-(trifluoromethyl)phenyl]propyl group. | (trifluoromethyl)benzenes; naphthalenes; secondary amino compound | calcimimetic; P450 inhibitor |
| nps-568 | N-(2-chlorophenylpropyl)-1-(3-methoxyphenyl)ethylamine: NPS-568 is the ((R), HCl salt)-isomer; calcimimetic compound and calcium-sensing receptor agonist | ||
| nps-568 | |||
| naringenin | (S)-naringenin : The (S)-enantiomer of naringenin. | (2S)-flavan-4-one; naringenin | expectorant; plant metabolite |
| N-(5-chloro-2-hydroxyphenyl)-2-ethoxybenzamide | benzamides | ||
| 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 | |
| chrysin | chrysin : A dihydroxyflavone in which the two hydroxy groups are located at positions 5 and 7. | 7-hydroxyflavonol; dihydroxyflavone | anti-inflammatory agent; antineoplastic agent; antioxidant; EC 2.7.11.18 (myosin-light-chain kinase) inhibitor; hepatoprotective agent; plant metabolite |
| 7-hydroxyflavone | 7-hydroxyflavone : A hydroxyflavonoid in which the flavone nucleus is substituted at position 7 by a hydroxy group. | hydroxyflavonoid | |
| nps2143 | |||
| ronacaleret | ronacaleret: a calcium-sensing receptor antagonist; structure in first source | ||
| chlorantranilipole | chlorantranilipole: anthranilic diamide insecticide.that disrupts mating in codling moth (Lepidoptera: Tortricidae) chlorantraniliprole : A carboxamide resulting from the formal condensation of the carboxylic acid group of 3-bromo-1-(3-chloropyridin-2-yl)-1H-pyrazole-5-carboxylic acid with the primary amino group of 2-amino-5-chloro-N,3-dimethylbenzamide. The first of the anthranilic diamide insecticides, it is a ryanodine receptor activator and is used to protect a wide variety of crops, including corn, cotton, grapes, rice and potatoes. | monochlorobenzenes; organobromine compound; pyrazole insecticide; pyrazoles; pyridines; secondary carboxamide | ryanodine receptor agonist |
| shamixanthone | shamixanthone : A pyranoxanthene that is 2,3-dihydropyrano[3,2-a]xanthen-12(1H)-one bearing hydroxy substituents at positions 1 and 11 as well as a prop-1-en-2-yl group at position 2, a methyl substituent at position 5 and a 3,3-dimethylallyl group at position 8. A secondary metabolite produced by Aspergillus nidulans. | cyclic ketone; phenols; pyranoxanthene | 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 | ||
| clozapine | clozapine : A benzodiazepine that is 5H-dibenzo[b,e][1,4]diazepine substituted by a chloro group at position 8 and a 4-methylpiperazin-1-yl group at position 11. It is a second generation antipsychotic used in the treatment of psychiatric disorders like schizophrenia. Clozapine: A tricylic dibenzodiazepine, classified as an atypical antipsychotic agent. It binds several types of central nervous system receptors, and displays a unique pharmacological profile. Clozapine is a serotonin antagonist, with strong binding to 5-HT 2A/2C receptor subtype. It also displays strong affinity to several dopaminergic receptors, but shows only weak antagonism at the dopamine D2 receptor, a receptor commonly thought to modulate neuroleptic activity. Agranulocytosis is a major adverse effect associated with administration of this agent. | benzodiazepine; N-arylpiperazine; N-methylpiperazine; organochlorine compound | adrenergic antagonist; dopaminergic antagonist; EC 3.4.21.26 (prolyl oligopeptidase) inhibitor; environmental contaminant; GABA antagonist; histamine antagonist; muscarinic antagonist; second generation antipsychotic; serotonergic antagonist; xenobiotic |