6aun: Difference between revisions
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==calcium-independent phospholipase A2 beta== | |||
<StructureSection load='6aun' size='340' side='right'caption='[[6aun]], [[Resolution|resolution]] 3.95Å' scene=''> | |||
== Structural highlights == | |||
<table><tr><td colspan='2'>[[6aun]] is a 2 chain structure with sequence from [https://en.wikipedia.org/wiki/Cricetulus_griseus Cricetulus griseus]. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=6AUN OCA]. For a <b>guided tour on the structure components</b> use [https://proteopedia.org/fgij/fg.htm?mol=6AUN FirstGlance]. <br> | |||
</td></tr><tr id='method'><td class="sblockLbl"><b>[[Empirical_models|Method:]]</b></td><td class="sblockDat" id="methodDat">X-ray diffraction, [[Resolution|Resolution]] 3.951Å</td></tr> | |||
<tr id='resources'><td class="sblockLbl"><b>Resources:</b></td><td class="sblockDat"><span class='plainlinks'>[https://proteopedia.org/fgij/fg.htm?mol=6aun FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=6aun OCA], [https://pdbe.org/6aun PDBe], [https://www.rcsb.org/pdb/explore.do?structureId=6aun RCSB], [https://www.ebi.ac.uk/pdbsum/6aun PDBsum], [https://prosat.h-its.org/prosat/prosatexe?pdbcode=6aun ProSAT]</span></td></tr> | |||
</table> | |||
== Function == | |||
[https://www.uniprot.org/uniprot/PLPL9_CRIGR PLPL9_CRIGR] Calcium-independent phospholipase involved in phospholipid remodeling with implications in cellular membrane homeostasis, mitochondrial integrity and signal transduction. Hydrolyzes the ester bond of the fatty acyl group attached at sn-1 or sn-2 position of phospholipids (phospholipase A1 and A2 activity respectively), producing lysophospholipids that are used in deacylation-reacylation cycles. Hydrolyzes both saturated and unsaturated long fatty acyl chains in various glycerophospholipid classes such as phosphatidylcholines, phosphatidylethanolamines and phosphatidates, with a preference for hydrolysis at sn-2 position (PubMed:9079687, PubMed:15908428). Can further hydrolyze lysophospholipids carrying saturated fatty acyl chains (lysophospholipase activity) (PubMed:9079687). Upon oxidative stress, contributes to remodeling of mitochondrial phospholipids in pancreatic beta cells, in a repair mechanism to reduce oxidized lipid content (By similarity). Preferentially hydrolyzes oxidized polyunsaturated fatty acyl chains from cardiolipins, yielding monolysocardiolipins that can be reacylated with unoxidized fatty acyls to regenerate native cardiolipin species. Hydrolyzes oxidized glycerophosphoethanolamines present in pancreatic islets, releasing oxidized polyunsaturated fatty acids such as hydroxyeicosatetraenoates (HETEs) (By similarity). Has thioesterase activity toward fatty-acyl CoA releasing CoA-SH known to facilitate fatty acid transport and beta-oxidation in mitochondria particularly in skeletal muscle (By similarity). Plays a role in regulation of membrane dynamics and homeostasis. Selectively hydrolyzes sn-2 arachidonoyl group in plasmalogen phospholipids, structural components of lipid rafts and myelin (PubMed:9079687). Regulates F-actin polymerization at the pseudopods, which is required for both speed and directionality of MCP1/CCL2-induced monocyte chemotaxis (By similarity). Targets membrane phospholipids to produce potent lipid signaling messengers. Generates lysophosphatidate (LPA, 1-acyl-glycerol-3-phosphate), which acts via G-protein receptors in various cell types (PubMed:9079687). Has phospholipase A2 activity toward platelet-activating factor (PAF, 1-O-alkyl-2-acetyl-sn-glycero-3-phosphocholine), likely playing a role in inactivation of this potent pro-inflammatory signaling lipid (PubMed:9079687). In response to glucose, amplifies calcium influx in pancreatic beta cells to promote INS secretion (By similarity).[UniProtKB:O60733][UniProtKB:P97570][UniProtKB:P97819]<ref>PMID:15908428</ref> <ref>PMID:9079687</ref> | |||
==See Also== | |||
*[[Phospholipase A2 3D structures|Phospholipase A2 3D structures]] | |||
== References == | |||
[[Category: | <references/> | ||
__TOC__ | |||
</StructureSection> | |||
[[Category: Cricetulus griseus]] | |||
[[Category: Large Structures]] | |||
[[Category: Gross RW]] | |||
[[Category: Jenkins CM]] | |||
[[Category: Korolev S]] | |||
[[Category: Koroleva O]] | |||
[[Category: Malley K]] | |||
[[Category: Miller I]] | |||
[[Category: Sanishvili R]] | |||