Target type: biologicalprocess
The chemical reactions and pathways involving phosphatidylcholines, any of a class of glycerophospholipids in which the phosphatidyl group is esterified to the hydroxyl group of choline. They are important constituents of cell membranes. [ISBN:0198506732]
Phosphatidylcholine (PC) metabolic process is a complex and essential pathway for cellular function. It encompasses the biosynthesis, degradation, and remodeling of PC, the most abundant phospholipid in eukaryotic cell membranes. PC plays a critical role in membrane structure, fluidity, and signaling, as well as in the transport and metabolism of other lipids.
**Biosynthesis:**
* **Kennedy pathway:** The major route of PC biosynthesis is the Kennedy pathway, which involves the sequential acylation of glycerol-3-phosphate with fatty acids to form phosphatidic acid. Phosphatidic acid is then converted to diacylglycerol, which is finally combined with CDP-choline to yield PC. Choline is obtained from the diet or from the breakdown of other phospholipids.
* **De novo synthesis:** PC can also be synthesized via the de novo pathway, which involves the methylation of phosphatidylethanolamine (PE) to generate PC. This pathway is less prominent than the Kennedy pathway, but it is important for maintaining PC levels in certain cell types.
**Degradation:**
* **Phospholipase activity:** PC can be degraded by various phospholipases, enzymes that hydrolyze phospholipids. Phospholipase A2 (PLA2) cleaves the fatty acid at the sn-2 position, while phospholipase C (PLC) hydrolyzes the phosphodiester bond between the phosphate group and the choline headgroup, yielding diacylglycerol and choline. Phospholipase D (PLD) cleaves the phosphodiester bond between the phosphate group and the glycerol backbone, generating phosphatidic acid and choline.
**Remodeling:**
* **Fatty acid exchange:** PC can undergo remodeling, where fatty acids are exchanged at the sn-1 and sn-2 positions. This process is catalyzed by lysophospholipid acyltransferases (LATs) and is important for adjusting the fatty acid composition of PC molecules to meet specific cellular needs.
**Regulation:**
* **Transcriptional control:** The expression of genes involved in PC metabolism is regulated by various transcription factors. For example, SREBPs (sterol regulatory element binding proteins) regulate the expression of genes involved in PC biosynthesis, while PPARs (peroxisome proliferator-activated receptors) regulate the expression of genes involved in PC degradation.
**Function:**
* **Membrane structure and fluidity:** PC is the most abundant phospholipid in eukaryotic cell membranes, providing structural integrity and regulating membrane fluidity.
* **Lipid transport and metabolism:** PC is involved in the transport and metabolism of other lipids, including cholesterol and fatty acids.
* **Signal transduction:** PC is a precursor for signaling molecules, such as diacylglycerol, which activates protein kinase C (PKC).
* **Cell growth and differentiation:** PC metabolism is essential for cell growth and differentiation.
**Disorders:**
* **Genetic defects:** Mutations in genes involved in PC metabolism can lead to a variety of disorders, including Niemann-Pick disease, Gaucher disease, and Zellweger syndrome.
* **Nutritional deficiencies:** Dietary deficiencies in choline can lead to reduced PC levels and impaired cellular function.
**Therapeutic implications:**
* **PC supplementation:** PC supplementation may be beneficial for conditions associated with impaired PC metabolism, such as Alzheimer's disease, Parkinson's disease, and liver disease.
* **Phospholipase inhibitors:** Phospholipase inhibitors may be used to treat conditions characterized by excessive phospholipase activity, such as inflammation and cancer.'
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| Protein | Definition | Taxonomy |
|---|---|---|
| Group IID secretory phospholipase A2 | A group IID secretory phospholipase A2 that is encoded in the genome of human. [PRO:DNx, UniProtKB:Q9UNK4] | Homo sapiens (human) |
| Group IIE secretory phospholipase A2 | A group IIE secretory phospholipase A2 that is encoded in the genome of human. [PRO:DNx, UniProtKB:Q9NZK7] | Homo sapiens (human) |
| Group 3 secretory phospholipase A2 | A group 3 secretory phospholipase A2 that is encoded in the genome of human. [PRO:DNx, UniProtKB:Q9NZ20] | Homo sapiens (human) |
| Putative inactive group IIC secretory phospholipase A2 | A group IIC secretory phospholipase A2 that is encoded in the genome of human. A substitution at a conserved active site residue likely renders it inactive. [PRO:DAN, UniProtKB:Q5R387] | Homo sapiens (human) |
| Serum paraoxonase/arylesterase 1 | A serum paraoxonase/arylesterase 1 that is encoded in the genome of human. [PRO:DNx, UniProtKB:P27169] | Homo sapiens (human) |
| Phospholipase A2, membrane associated | A phospholipase A2, membrane associated that is encoded in the genome of human. [PRO:DNx, UniProtKB:P14555] | Homo sapiens (human) |
| Cholesteryl ester transfer protein | A cholesteryl ester transfer protein that is encoded in the genome of human. [PRO:DNx, UniProtKB:P11597] | Homo sapiens (human) |
| Phosphatidylcholine-sterol acyltransferase | A phosphatidylcholine-sterol acyltransferase that is encoded in the genome of human. [PRO:DNx, UniProtKB:P04180] | Homo sapiens (human) |
| Phospholipase A2 | A phospholipase A2 that is encoded in the genome of human. [PRO:DNx, UniProtKB:P04054] | Homo sapiens (human) |
| Group 10 secretory phospholipase A2 | A group 10 secretory phospholipase A2 that is encoded in the genome of human. [PRO:DNx, UniProtKB:O15496] | Homo sapiens (human) |
| Compound | Definition | Classes | Roles |
|---|---|---|---|
| quinacrine | quinacrine : A member of the class of acridines that is acridine substituted by a chloro group at position 6, a methoxy group at position 2 and a [5-(diethylamino)pentan-2-yl]nitrilo group at position 9. Quinacrine: An acridine derivative formerly widely used as an antimalarial but superseded by chloroquine in recent years. It has also been used as an anthelmintic and in the treatment of giardiasis and malignant effusions. It is used in cell biological experiments as an inhibitor of phospholipase A2. | acridines; aromatic ether; organochlorine compound; tertiary amino compound | antimalarial; EC 1.8.1.12 (trypanothione-disulfide reductase) inhibitor |
| 4-nitrophenylphosphate | 4-nitrophenyl phosphate : An aryl phosphate resulting from the mono-esterification of phosphoric acid with 4-nitrophenol. nitrophenylphosphate: RN given refers to mono(4-nitrophenyl) ester of phosphoric acid | aryl phosphate | mouse metabolite |
| niacin | Niacin: A water-soluble vitamin of the B complex occurring in various animal and plant tissues. It is required by the body for the formation of coenzymes NAD and NADP. It has PELLAGRA-curative, vasodilating, and antilipemic properties. nicotinic acid : A pyridinemonocarboxylic acid that is pyridine in which the hydrogen at position 3 is replaced by a carboxy group. vitamin B3 : Any member of a group of vitamers that belong to the chemical structural class called pyridines that exhibit biological activity against vitamin B3 deficiency. Vitamin B3 deficiency causes a condition known as pellagra whose symptoms include depression, dermatitis and diarrhea. The vitamers include nicotinic acid and nicotinamide (and their ionized and salt forms). | pyridine alkaloid; pyridinemonocarboxylic acid; vitamin B3 | antidote; antilipemic drug; EC 3.5.1.19 (nicotinamidase) inhibitor; Escherichia coli metabolite; human urinary metabolite; metabolite; mouse metabolite; plant metabolite; vasodilator agent |
| 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 |
| diclofenac sodium | diclofenac(1-) : The conjugate base of diclofenac. | monocarboxylic acid anion | |
| furosemide | furosemide : A chlorobenzoic acid that is 4-chlorobenzoic acid substituted by a (furan-2-ylmethyl)amino and a sulfamoyl group at position 2 and 5 respectively. It is a diuretic used in the treatment of congestive heart failure. Furosemide: A benzoic-sulfonamide-furan. It is a diuretic with fast onset and short duration that is used for EDEMA and chronic RENAL INSUFFICIENCY. | chlorobenzoic acid; furans; sulfonamide | environmental contaminant; loop diuretic; xenobiotic |
| ifosfamide | ifosfamides | alkylating agent; antineoplastic agent; environmental contaminant; immunosuppressive agent; xenobiotic | |
| indomethacin | indometacin : A member of the class of indole-3-acetic acids that is indole-3-acetic acid in which the indole ring is substituted at positions 1, 2 and 5 by p-chlorobenzoyl, methyl, and methoxy groups, respectively. A non-steroidal anti-inflammatory drug, it is used in the treatment of musculoskeletal and joint disorders including osteoarthritis, rheumatoid arthritis, gout, bursitis and tendinitis. Indomethacin: A non-steroidal anti-inflammatory agent (NSAID) that inhibits CYCLOOXYGENASE, which is necessary for the formation of PROSTAGLANDINS and other AUTACOIDS. It also inhibits the motility of POLYMORPHONUCLEAR LEUKOCYTES. | aromatic ether; indole-3-acetic acids; monochlorobenzenes; N-acylindole | analgesic; drug metabolite; EC 1.14.99.1 (prostaglandin-endoperoxide synthase) inhibitor; environmental contaminant; gout suppressant; non-steroidal anti-inflammatory drug; xenobiotic; xenobiotic metabolite |
| ketoprofen | ketoprofen : An oxo monocarboxylic acid that consists of propionic acid substituted by a 3-benzoylphenyl group at position 2. Ketoprofen: An IBUPROFEN-type anti-inflammatory analgesic and antipyretic. It is used in the treatment of rheumatoid arthritis and osteoarthritis. | benzophenones; oxo monocarboxylic acid | antipyretic; drug allergen; EC 1.14.99.1 (prostaglandin-endoperoxide synthase) inhibitor; environmental contaminant; non-steroidal anti-inflammatory drug; xenobiotic |
| mafenide | Mafenide: A sulfonamide that inhibits the enzyme CARBONIC ANHYDRASE and is used as a topical anti-bacterial agent, especially in burn therapy. | aromatic amine | |
| nifedipine | Nifedipine: A potent vasodilator agent with calcium antagonistic action. It is a useful anti-anginal agent that also lowers blood pressure. | C-nitro compound; dihydropyridine; methyl ester | calcium channel blocker; human metabolite; tocolytic agent; vasodilator agent |
| sulfacetamide | sulfacetamide : A sulfonamide that is sulfanilamide acylated on the sulfonamide nitrogen. Sulfacetamide: An anti-bacterial agent that is used topically to treat skin infections and orally for urinary tract infections. | N-sulfonylcarboxamide; substituted aniline | antibacterial drug; antiinfective agent; antimicrobial agent; EC 2.5.1.15 (dihydropteroate synthase) inhibitor |
| 4-bromophenacyl bromide | 4-bromophenacyl bromide: phospholipidase A(2) inhibitor; structure | ||
| oleanolic acid | hydroxy monocarboxylic acid; pentacyclic triterpenoid | plant metabolite | |
| phenylphosphate | phenyl phosphate : An aryl phosphate resulting from the mono-esterification of phosphoric acid with phenol. phenylphosphate: structure given in first source | aryl phosphate | mouse metabolite |
| paclitaxel | Taxus: Genus of coniferous yew trees or shrubs, several species of which have medicinal uses. Notable is the Pacific yew, Taxus brevifolia, which is used to make the anti-neoplastic drug taxol (PACLITAXEL). | taxane diterpenoid; tetracyclic diterpenoid | antineoplastic agent; human metabolite; metabolite; microtubule-stabilising agent |
| etoposide | beta-D-glucoside; furonaphthodioxole; organic heterotetracyclic compound | antineoplastic agent; DNA synthesis inhibitor | |
| ursolic acid | hydroxy monocarboxylic acid; pentacyclic triterpenoid | geroprotector; plant metabolite | |
| ubenimex | ubenimex: growth inhibitor | ||
| 5-amino-1,3,4-thiadiazole-2-sulfonamide | 5-amino-1,3,4-thiadiazole-2-sulfonamide: structure in first source | ||
| 5-benzyloxytryptophan | |||
| fpl 67047xx | FPL 67047XX: inhibits phospholipase A2; structure in first source | ||
| 3-octylthio-1,1,1-trifluoro-2-propanone | 3-octylthio-1,1,1-trifluoro-2-propanone: a pesticide synergist; inhibits juvenile hormone esterase | ||
| docetaxel anhydrous | docetaxel anhydrous : A tetracyclic diterpenoid that is paclitaxel with the N-benzyloxycarbonyl group replaced by N-tert-butoxycarbonyl, and the acetoxy group at position 10 replaced by a hydroxy group. Docetaxel: A semisynthetic analog of PACLITAXEL used in the treatment of locally advanced or metastatic BREAST NEOPLASMS and NON-SMALL CELL LUNG CANCER. | secondary alpha-hydroxy ketone; tetracyclic diterpenoid | antimalarial; antineoplastic agent; photosensitizing agent |
| varespladib | aromatic ether; benzenes; dicarboxylic acid monoamide; indoles; monocarboxylic acid; primary carboxamide | anti-inflammatory drug; antidote; EC 3.1.1.4 (phospholipase A2) inhibitor | |
| ly 311727 | LY 311727: a potent & selective inhibitor of human non-pancreatic secretory phospholipase A2; structure given in first source | ||
| torcetrapib | (trifluoromethyl)benzenes; carbamate ester; quinolines | anticholesteremic drug; CETP inhibitor | |
| sb 203580 | imidazoles; monofluorobenzenes; pyridines; sulfoxide | EC 2.7.11.1 (non-specific serine/threonine protein kinase) inhibitor; EC 2.7.11.24 (mitogen-activated protein kinase) inhibitor; geroprotector; Hsp90 inhibitor; neuroprotective agent | |
| cholic acid | cholic acid : A bile acid that is 5beta-cholan-24-oic acid bearing three alpha-hydroxy substituents at position 3, 7 and 12. Cholic Acid: A major primary bile acid produced in the liver and usually conjugated with glycine or taurine. It facilitates fat absorption and cholesterol excretion. | 12alpha-hydroxy steroid; 3alpha-hydroxy steroid; 7alpha-hydroxy steroid; bile acid; C24-steroid; trihydroxy-5beta-cholanic acid | human metabolite; mouse metabolite |
| clindamycin phosphate | |||
| delta-8-tetrahydrocannabinol | 1-benzopyran | ||
| curcumin | curcumin : A beta-diketone that is methane in which two of the hydrogens are substituted by feruloyl groups. A natural dyestuff found in the root of Curcuma longa. Curcumin: A yellow-orange dye obtained from tumeric, the powdered root of CURCUMA longa. It is used in the preparation of curcuma paper and the detection of boron. Curcumin appears to possess a spectrum of pharmacological properties, due primarily to its inhibitory effects on metabolic enzymes. | aromatic ether; beta-diketone; diarylheptanoid; enone; polyphenol | anti-inflammatory agent; antifungal agent; antineoplastic agent; biological pigment; contraceptive drug; dye; EC 1.1.1.205 (IMP dehydrogenase) inhibitor; EC 1.1.1.21 (aldehyde reductase) inhibitor; EC 1.1.1.25 (shikimate dehydrogenase) inhibitor; EC 1.6.5.2 [NAD(P)H dehydrogenase (quinone)] inhibitor; EC 1.8.1.9 (thioredoxin reductase) inhibitor; EC 2.7.10.2 (non-specific protein-tyrosine kinase) inhibitor; EC 3.5.1.98 (histone deacetylase) inhibitor; flavouring agent; food colouring; geroprotector; hepatoprotective agent; immunomodulator; iron chelator; ligand; lipoxygenase inhibitor; metabolite; neuroprotective agent; nutraceutical; radical scavenger |
| lincomycin | lincomycin : A carbohydrate-containing antibiotic produced by the actinomyces Streptomyces lincolnensis. Lincomycin: An antibiotic produced by Streptomyces lincolnensis var. lincolnensis. It has been used in the treatment of staphylococcal, streptococcal, and Bacteroides fragilis infections. | carbohydrate-containing antibiotic; L-proline derivative; monocarboxylic acid amide; pyrrolidinecarboxamide; S-glycosyl compound | antimicrobial agent; bacterial metabolite |
| 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 | |
| amentoflavone | biflavonoid; hydroxyflavone; ring assembly | angiogenesis inhibitor; antiviral agent; cathepsin B inhibitor; P450 inhibitor; plant metabolite | |
| 17-(dimethylaminoethylamino)-17-demethoxygeldanamycin | 17-(dimethylaminoethylamino)-17-demethoxygeldanamycin: structure in first source alvespimycin : A 19-membered macrocyle that is geldanamycin in which the methoxy group attached to the benzoquinone moiety has been replaced by a 2-(N,N-dimethylamino)ethylamino group. | 1,4-benzoquinones; ansamycin; carbamate ester; secondary amino compound; tertiary amino compound | Hsp90 inhibitor |
| 4-amylcinnamoylanthranilic acid | 4-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 |
| 3-(4-octadecyl)benzoylacrylic acid | |||
| ochnaflavone | ochnaflavone : A biflavonoid with an ether linkage between the B-rings of the apigenin and luteolin subunits. It has been isolated from several members of the Ochnaceae plant family. ochnaflavone: from Lonicera japonica; structure given in first source | aromatic ether; biflavonoid; hydroxyflavone | anti-inflammatory agent; antiatherogenic agent; antibacterial agent; EC 3.1.1.4 (phospholipase A2) inhibitor; leukotriene antagonist; plant metabolite |
| manoalide | manoalide : A sesterterpenoid isolated from the marine sponge Luffariella variabilis and which has been shown to exhibit inhibitory activity towards phospholipase A2. manoalide: phospholipase A2 inhibitor; sesterterpene from marine sponge L. variabilis; structure given in first source | butenolide; lactol; sesterterpenoid | EC 3.1.1.4 (phospholipase A2) inhibitor; EC 5.99.1.2 (DNA topoisomerase) inhibitor; EC 5.99.1.3 [DNA topoisomerase (ATP-hydrolysing)] inhibitor; metabolite |
| manoalogue | manoalogue: synthetic analog of manoalide; phospholipase A2 antagonist; structure given in first source | ||
| tanespimycin | CP 127374: analog of herbimycin A | 1,4-benzoquinones; ansamycin; carbamate ester; organic heterobicyclic compound; secondary amino compound | antineoplastic agent; apoptosis inducer; Hsp90 inhibitor |
| dalcetrapib | dalcetrapib: inhibits cholesteryl ester transfer protein (CETP) | anilide | |
| am-411 | |||
| sc 795 | |||
| 3-((3-(4-chloro-3-ethylphenoxy)phenyl)(3-(1,1,2,2-tetrafluoroethoxy)benzyl)amino)-1,1,1-trifluoropropan-2-ol | 3-((3-(4-chloro-3-ethylphenoxy)phenyl)(3-(1,1,2,2-tetrafluoroethoxy)benzyl)amino)-1,1,1-trifluoropropan-2-ol: inhibits cholesteryl ester transfer protein; structure in first source | ||
| ursodoxicoltaurine | tauroursodeoxycholate : An organosulfonate oxoanion that is the conjugate base of tauroursodeoxycholic acid arising from deprotonation of the sulfonate OH group; major species at pH 7.3. tauroursodeoxycholic acid : A bile acid taurine conjugate derived from ursoodeoxycholic acid. | bile acid taurine conjugate | anti-inflammatory agent; apoptosis inhibitor; bone density conservation agent; cardioprotective agent; human metabolite; neuroprotective agent |
| ym 26734 | YM 26734: inhibits group II phospholipase A2; structure given in first source | ||
| indoxam | indoxam: structure in first source | ||
| amg 3 | AMG 3: structure in first source | ||
| bolinaquinone | bolinaquinone: a marine sesquiterpenoid from sponge Dysidea sp. with anti-inflammatory activity; structure in first source | ||
| km-233 | KM-233: used for the treatment of high-grade glioma; structure in first source | ||
| cacospongionolide b | cacospongionolide B: isolated from the sponge Fasciospongia cavernosa; structure in first source | ||
| mk 0354 | |||
| anacetrapib | |||
| humanin | humanin: suppresses neuronal cell death induced by the Swedish mutant of amyloid precursor protein; suppresses neuronal cell death induced by three different types of FAD genes and amyloid beta; amino acid sequence in first source | ||
| t-tucb | |||
| gdc 0941 | pictrelisib : A sulfonamide composed of indazole, morpholine, and methylsulfonyl-substituted piperazine rings bound to a thienopyrimidine ring. | indazoles; morpholines; piperazines; sulfonamide; thienopyrimidine | EC 2.7.1.137 (phosphatidylinositol 3-kinase) inhibitor |
| skepinone-l | skepinone-L: a dibenzosuberone-type p38 MAPK inhibitor; structure in first source | ||
| evacetrapib | benzazepine | ||
| oxytetracycline, anhydrous | oxytetracycline : A tetracycline used for treatment of infections caused by a variety of Gram positive and Gram negative microorganisms including Mycoplasma pneumoniae, Pasteurella pestis, Escherichia coli, Haemophilus influenzae (respiratory infections), and Diplococcus pneumoniae. Oxytetracycline: A TETRACYCLINE analog isolated from the actinomycete STREPTOMYCES RIMOSUS and used in a wide variety of clinical conditions. | ||
| mobiflex | tenoxicam : A thienothiazine-derived monocarboxylic acid amide obtained by formal condensation of the carboxy group of 4-hydroxy-2-methylthieno[2,3-e][1,2]thiazine-3-carboxylic acid 1,1-dioxide with the amino group of 2-aminopyridine. Used for the treatment of pain and inflammation in osteoarthritis and rheumatoid arthritis. It is also indicated for short term treatment of acute musculoskeletal disorders including strains, sprains and other soft-tissue injuries. | heteroaryl hydroxy compound; monocarboxylic acid amide; pyridines; thienothiazine | antipyretic; EC 1.14.99.1 (prostaglandin-endoperoxide synthase) inhibitor; non-narcotic analgesic; non-steroidal anti-inflammatory drug |
| lornoxicam | lornoxicam : A thienothiazine-derived monocarboxylic acid amide obtained by formal condensation of the carboxy group of 6-chloro-4-hydroxy-2-methylthieno[2,3-e][1,2]thiazine-3-carboxylic acid 1,1-dioxide with the amino group of 2-aminopyridine. Used for the treatment of pain, primarily resulting from inflammatory diseases of the joints, osteoarthritis, surgery, sciatica and other inflammations. | heteroaryl hydroxy compound; monocarboxylic acid amide; organochlorine compound; pyridines; thienothiazine | antipyretic; non-narcotic analgesic; non-steroidal anti-inflammatory drug |