leukotriene-C4 synthase activity
Definition
Target type: molecularfunction
Catalysis of the reaction: leukotriene C(4) = glutathione + leukotriene A(4). [EC:4.4.1.20, RHEA:17617]
Leukotriene-C4 synthase activity is a crucial enzymatic function involved in the biosynthesis of leukotriene C4 (LTC4), a potent inflammatory mediator. This enzyme, also known as LTC4 synthase, catalyzes the transfer of glutathione (GSH) from glutathione S-transferase to leukotriene A4 (LTA4). This reaction results in the formation of LTC4, the first member of the cysteinyl leukotriene family. The active site of LTC4 synthase exhibits a high degree of selectivity for LTA4, ensuring the specific production of LTC4. LTC4, in turn, plays a significant role in various physiological processes, including inflammation, bronchoconstriction, and immune responses. It exerts its effects by binding to specific receptors, primarily CysLT1 and CysLT2 receptors, located on various cells, such as smooth muscle cells, mast cells, and eosinophils. The activation of these receptors triggers a cascade of intracellular signaling events, leading to the release of inflammatory mediators, such as histamine, and the contraction of smooth muscle cells. Leukotriene-C4 synthase activity, therefore, is essential for the generation of a potent inflammatory mediator, LTC4, which plays a critical role in various physiological and pathological processes.'
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Proteins (2)
| Protein | Definition | Taxonomy |
|---|---|---|
| Arachidonate 5-lipoxygenase-activating protein | An arachidonate 5-lipoxygenase-activating protein that is encoded in the genome of human. [PRO:DNx, UniProtKB:P20292] | Homo sapiens (human) |
| Leukotriene C4 synthase | A leukotriene C4 synthase that is encoded in the genome of human. [PRO:DNx, UniProtKB:Q16873] | Homo sapiens (human) |
Compounds (12)
| Compound | Definition | Classes | Roles |
|---|---|---|---|
| acetaminophen | Acetaminophen: Analgesic antipyretic derivative of acetanilide. It has weak anti-inflammatory properties and is used as a common analgesic, but may cause liver, blood cell, and kidney damage. paracetamol : A member of the class of phenols that is 4-aminophenol in which one of the hydrogens attached to the amino group has been replaced by an acetyl group. | acetamides; phenols | antipyretic; cyclooxygenase 1 inhibitor; cyclooxygenase 2 inhibitor; cyclooxygenase 3 inhibitor; environmental contaminant; ferroptosis inducer; geroprotector; hepatotoxic agent; human blood serum metabolite; non-narcotic analgesic; non-steroidal anti-inflammatory drug; xenobiotic |
| acetazolamide | Acetazolamide: One of the CARBONIC ANHYDRASE INHIBITORS that is sometimes effective against absence seizures. It is sometimes useful also as an adjunct in the treatment of tonic-clonic, myoclonic, and atonic seizures, particularly in women whose seizures occur or are exacerbated at specific times in the menstrual cycle. However, its usefulness is transient often because of rapid development of tolerance. Its antiepileptic effect may be due to its inhibitory effect on brain carbonic anhydrase, which leads to an increased transneuronal chloride gradient, increased chloride current, and increased inhibition. (From Smith and Reynard, Textbook of Pharmacology, 1991, p337) | monocarboxylic acid amide; sulfonamide; thiadiazoles | anticonvulsant; diuretic; EC 4.2.1.1 (carbonic anhydrase) inhibitor |
| zonisamide | zonisamide : A 1,2-benzoxazole compound having a sulfamoylmethyl substituent at the 3-position. Zonisamide: A benzisoxazole and sulfonamide derivative that acts as a CALCIUM CHANNEL blocker. It is used primarily as an adjunctive antiepileptic agent for the treatment of PARTIAL SEIZURES, with or without secondary generalization. | 1,2-benzoxazoles; sulfonamide | anticonvulsant; antioxidant; central nervous system drug; protective agent; T-type calcium channel blocker |
| zileuton | 1-benzothiophenes; ureas | anti-asthmatic drug; EC 1.13.11.34 (arachidonate 5-lipoxygenase) inhibitor; ferroptosis inhibitor; leukotriene antagonist; non-steroidal anti-inflammatory drug | |
| mk 0591 | MK 0591: structure given in first source; MK 0591 was previously L-686,708; inhibits leukotriene biosynthesis by inhibiting 5-lipoxygenase activating protein | ||
| 1-(2-chlorobenzyl)-2-(1-(4-isobutylphenyl)ethyl)-1h-benzimidazole | 1-(2-chlorobenzyl)-2-(1-(4-isobutylphenyl)ethyl)-1H-benzimidazole: targets 5-lipoxygenase-activating protein to inhibit leukotriene biosynthesis; structure in first source | ||
| l 663536 | 3-[3-(tert-butylsulfanyl)-1-(4-chlorobenzyl)-5-(propan-2-yl)-1H-indol-2-yl]-2,2-dimethylpropanoic acid : A member of the class of indoles that is 1H-indole substituted by a isopropyl group at position 5, a tert-butylsulfanediyl group at position 3, a 4-chlorobenzyl group at position 1 and a 2-carboxy-2-methylpropyl group at position 2. It acts as an inhibitor of arachidonate 5-lipoxygenase. MK-886: orally active leukotriene biosynthesis inhibitor | aryl sulfide; indoles; monocarboxylic acid; monochlorobenzenes | antineoplastic agent; EC 1.13.11.34 (arachidonate 5-lipoxygenase) inhibitor; leukotriene antagonist |
| montelukast | montelukast: a leukotriene D4 receptor antagonist | aliphatic sulfide; monocarboxylic acid; quinolines | anti-arrhythmia drug; anti-asthmatic drug; leukotriene antagonist |
| psoralidin | psoralidin : A member of the class of coumestans that is coumestan substituted by hydroxy groups at positions 3 and 9 and a prenyl group at position 2 respectively. | coumestans; delta-lactone; polyphenol | estrogen receptor agonist; plant metabolite |
| topiramate | topiramate : A hexose derivative that is 2,3:4,5-di-O-isopropylidene-beta-D-fructopyranose in which the hydroxy group has been converted to the corresponding sulfamate ester. It blocks voltage-dependent sodium channels and is used as an antiepileptic and for the prevention of migraine. Topiramate: A sulfamate-substituted fructose analog that was originally identified as a hypoglycemic agent. It is used for the treatment of EPILEPSY and MIGRAINE DISORDERS, and may also promote weight loss. | cyclic ketal; ketohexose derivative; sulfamate ester | anticonvulsant; sodium channel blocker |
| bwa 4c | |||
| p-Glu-Arg-Pro-Arg-Leu-Ser-His-Lys-Gly-Pro-Met-Pro-Phe | p-Glu-Arg-Pro-Arg-Leu-Ser-His-Lys-Gly-Pro-Met-Pro-Phe : A thirteen-membered polypeptide consisting of p-Glu, Arg, Pro, Arg, Leu, Ser, His, Lys, Gly, Pro, Met, Pro and Phe residues joined in sequence. | polypeptide | apoptosis inhibitor; human metabolite; neuroprotective agent |