Page last updated: 2024-10-24
calcium-independent phospholipase A2 activity
Definition
Target type: molecularfunction
Catalysis of the reaction: phosphatidylcholine + H2O = 1-acylglycerophosphocholine + a carboxylate. This reaction does not require Ca2+. [EC:3.1.1.4]
Calcium-independent phospholipase A2 (iPLA2) activity is a crucial enzymatic process involved in the hydrolysis of glycerophospholipids, specifically at the sn-2 position, releasing free fatty acids and lysophospholipids. This activity is independent of calcium ions, unlike its calcium-dependent counterpart. iPLA2 enzymes play a significant role in various cellular processes, including:
- **Lipid Signaling:** iPLA2s contribute to the generation of bioactive lipid mediators, such as arachidonic acid, which serves as a precursor for eicosanoids involved in inflammation, pain, and immune responses.
- **Membrane Remodeling:** iPLA2 activity is involved in the remodeling of cell membranes, facilitating the removal of damaged or oxidized phospholipids and contributing to membrane fluidity and integrity.
- **Cell Survival and Apoptosis:** iPLA2s have been implicated in both cell survival and apoptotic pathways. They can participate in the generation of pro-survival signals or promote apoptosis depending on the specific context.
- **Cellular Processes:** iPLA2 activity has been linked to a range of cellular processes, including cell growth, differentiation, and migration.
iPLA2s exhibit diverse substrate specificity and are regulated by various factors, including phosphorylation, interaction with other proteins, and cellular redox status. Their activity is tightly controlled to maintain cellular homeostasis and prevent dysregulation leading to pathological conditions.'
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Proteins (6)
| Protein | Definition | Taxonomy |
|---|---|---|
| Cytosolic phospholipase A2 | A cytosolic phospholipase A2 that is encoded in the genome of cow. [OMA:A4IFJ5, PRO:DNx] | Bos taurus (cattle) |
| Cytosolic phospholipase A2 gamma | A cytosolic phospholipase A2 gamma that is encoded in the genome of human. [PRO:DNx, UniProtKB:Q9UP65] | Homo sapiens (human) |
| Platelet-activating factor acetylhydrolase | A platelet-activating factor acetylhydrolase that is encoded in the genome of human. [PRO:DNx, UniProtKB:Q13093] | Homo sapiens (human) |
| Cytosolic phospholipase A2 | A cytosolic phospholipase A2 that is encoded in the genome of human. [PRO:DNx, UniProtKB:P47712] | Homo sapiens (human) |
| Phospholipase A2 group V | A phospholipase A2 group V that is encoded in the genome of human. [PRO:DNx, UniProtKB:P39877] | Homo sapiens (human) |
| 85/88 kDa calcium-independent phospholipase A2 | An 85/88 kDa calcium-independent phospholipase A2 that is encoded in the genome of human. [PRO:DNx, UniProtKB:O60733] | Homo sapiens (human) |
Compounds (30)
| Compound | Definition | Classes | Roles |
|---|---|---|---|
| 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 |
| ly 171883 | LY 171883: structure in first source; leukotriene receptor antagonist tomelukast : A member of the class of acetophenones that is 1-phenylethanone substituted at position 2 by a hydroxy group, a propyl group at position 3 and a 4-(1H-tetrazol-5-yl)butoxy group at position 4. A leukotriene antagonist, it exhibits anti-asthmatic activity. | acetophenones; aromatic ether; phenols; tetrazoles | anti-asthmatic drug; leukotriene antagonist |
| vitamin k 3 | Vitamin K 3: A synthetic naphthoquinone without the isoprenoid side chain and biological activity, but can be converted to active vitamin K2, menaquinone, after alkylation in vivo. | 1,4-naphthoquinones; vitamin K | angiogenesis inhibitor; antineoplastic agent; EC 3.4.22.69 (SARS coronavirus main proteinase) inhibitor; human urinary metabolite; nutraceutical |
| raloxifene | raloxifene : A member of the class of 1-benzothiophenes that is 1-benzothiophene in which the hydrogens at positions 2, 3, and 6 have been replaced by p-hydroxyphenyl, p-[2-(piperidin-1-yl)ethoxy]benzoyl, and hydroxy groups, respectively. | 1-benzothiophenes; aromatic ketone; N-oxyethylpiperidine; phenols | bone density conservation agent; estrogen antagonist; estrogen receptor modulator |
| 1,6-bis(cyclohexyloximinocarbonyl)hexane | 1,6-bis(cyclohexyloximinocarbonyl)hexane: selective inhibitor of canine platelet diglyceride lipase | carbamate ester; organonitrogen compound | |
| vorinostat | vorinostat : A dicarboxylic acid diamide comprising suberic (octanedioic) acid coupled to aniline and hydroxylamine. A histone deacetylase inhibitor, it is marketed under the name Zolinza for the treatment of cutaneous T cell lymphoma (CTCL). Vorinostat: A hydroxamic acid and anilide derivative that acts as a HISTONE DEACETYLASE inhibitor. It is used in the treatment of CUTANEOUS T-CELL LYMPHOMA and SEZARY SYNDROME. | dicarboxylic acid diamide; hydroxamic acid | antineoplastic agent; apoptosis inducer; EC 3.5.1.98 (histone deacetylase) inhibitor |
| ici 204,219 | zafirlukast: a leukotriene D4 receptor antagonist | carbamate ester; indoles; N-sulfonylcarboxamide | anti-asthmatic agent; leukotriene antagonist |
| 5,5-dimethylhydantoin | 5,5-dimethylhydantoin: RN given refers to parent cpd | imidazolidine-2,4-dione | |
| benzenesulfonamide | sulfonamide | ||
| plumbagin | plumbagin : A hydroxy-1,4-naphthoquinone that is 1,4-naphthoquinone in which the hydrogens at positions 2 and 5 are substituted by methyl and hydroxy groups, respectively. plumbagin: a superoxide anion generator | hydroxy-1,4-naphthoquinone; phenols | anticoagulant; antineoplastic agent; immunological adjuvant; metabolite |
| wy 48252 | Wy 48252: leukotriene D4 antagonist | ||
| 4-[1-[4-[2-(dimethylamino)ethoxy]phenyl]-2-phenylbut-1-enyl]phenol | stilbenoid | ||
| spiroglumide | spiroglumide: a CCK receptor antagonist; antigastrin; structure given 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 | ||
| varespladib | aromatic ether; benzenes; dicarboxylic acid monoamide; indoles; monocarboxylic acid; primary carboxamide | anti-inflammatory drug; antidote; EC 3.1.1.4 (phospholipase A2) inhibitor | |
| arachidonic acid | arachidonate : A long-chain fatty acid anion resulting from the removal of a proton from the carboxy group of arachidonic acid. icosa-5,8,11,14-tetraenoic acid : Any icosatetraenoic acid with the double bonds at positions 5, 8, 11 and 14. | icosa-5,8,11,14-tetraenoic acid; long-chain fatty acid; omega-6 fatty acid | Daphnia galeata metabolite; EC 3.1.1.1 (carboxylesterase) inhibitor; human metabolite; mouse metabolite |
| tamoxifen | stilbenoid; tertiary amino compound | angiogenesis inhibitor; antineoplastic agent; bone density conservation agent; EC 1.2.3.1 (aldehyde oxidase) inhibitor; EC 2.7.11.13 (protein kinase C) inhibitor; estrogen antagonist; estrogen receptor antagonist; estrogen receptor modulator | |
| orlistat | orlistat : A carboxylic ester resulting from the formal condensation of the carboxy group of N-formyl-L-leucine with the hydroxy group of (3S,4S)-3-hexyl-4-[(2S)-2-hydroxytridecyl]oxetan-2-one. A pancreatic lipase inhibitor, it is used as an anti-obesity drug. Orlistat: A lactone derivative of LEUCINE that acts as a pancreatic lipase inhibitor to limit the absorption of dietary fat; it is used in the management of obesity. | beta-lactone; carboxylic ester; formamides; L-leucine derivative | anti-obesity agent; bacterial metabolite; EC 2.3.1.85 (fatty acid synthase) inhibitor; EC 3.1.1.3 (triacylglycerol lipase) inhibitor |
| arachidonyltrifluoromethane | AACOCF3 : A fatty acid derivative that is arachidonic acid in which the OH part of the carboxy group has been replaced by a trifluoromethyl group arachidonyltrifluoromethane: structure given in first source; inhibits 85-kDa phospholipase A2 | fatty acid derivative; ketone; olefinic compound; organofluorine compound | EC 3.1.1.4 (phospholipase A2) inhibitor |
| amentoflavone | biflavonoid; hydroxyflavone; ring assembly | angiogenesis inhibitor; antiviral agent; cathepsin B inhibitor; P450 inhibitor; plant metabolite | |
| 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 |
| ym 26734 | YM 26734: inhibits group II phospholipase A2; structure given in first source | ||
| efipladib | efipladib: structure in first source | ||
| indoxam | indoxam: structure in first source | ||
| darapladib | darapladib: a selective lipoprotein-associated phospholipase A(2) (Lp-PLA(2)) inhibitor, on biomarkers of cardiovascular (CV) risk | ||
| sb-435495 | SB-435495: structure in first source | ||
| methyl arachidonylfluorophosphonate | phosphonic ester | ||
| pyrrophenone | pyrrophenone: structure in first source | ||
| 14-methyl-20-oxa-5,7,14,26-tetraazatetracyclo(19.3.1.1(2,6).1(8,12))heptacosa-1(25),2(26),3,5,8(27),9,11,16,21,23-decaene | 14-methyl-20-oxa-5,7,14,26-tetraazatetracyclo(19.3.1.1(2,6).1(8,12))heptacosa-1(25),2(26),3,5,8(27),9,11,16,21,23-decaene: has antineoplastic activity; also inhibits Fms-like tyrosine kinase-3; structure in first source |