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New page: left|200px<br /> <applet load="1bci" size="450" color="white" frame="true" align="right" spinBox="true" caption="1bci" /> '''C2 DOMAIN OF CYTOSOLIC PHOSPHOLIPASE A2, NM... |
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== | ==C2 DOMAIN OF CYTOSOLIC PHOSPHOLIPASE A2, NMR, MINIMIZED AVERAGE STRUCTURE== | ||
The amino-terminal, 138 amino acid C2 domain of cytosolic phospholipase A2 | <StructureSection load='1bci' size='340' side='right'caption='[[1bci]]' scene=''> | ||
== Structural highlights == | |||
<table><tr><td colspan='2'>[[1bci]] is a 1 chain structure with sequence from [https://en.wikipedia.org/wiki/Homo_sapiens Homo sapiens]. Full experimental information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=1BCI OCA]. For a <b>guided tour on the structure components</b> use [https://proteopedia.org/fgij/fg.htm?mol=1BCI FirstGlance]. <br> | |||
</td></tr><tr id='method'><td class="sblockLbl"><b>[[Empirical_models|Method:]]</b></td><td class="sblockDat" id="methodDat">Solution NMR</td></tr> | |||
<tr id='ligand'><td class="sblockLbl"><b>[[Ligand|Ligands:]]</b></td><td class="sblockDat" id="ligandDat"><scene name='pdbligand=CA:CALCIUM+ION'>CA</scene></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=1bci FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=1bci OCA], [https://pdbe.org/1bci PDBe], [https://www.rcsb.org/pdb/explore.do?structureId=1bci RCSB], [https://www.ebi.ac.uk/pdbsum/1bci PDBsum], [https://prosat.h-its.org/prosat/prosatexe?pdbcode=1bci ProSAT]</span></td></tr> | |||
</table> | |||
== Function == | |||
[https://www.uniprot.org/uniprot/PA24A_HUMAN PA24A_HUMAN] Selectively hydrolyzes arachidonyl phospholipids in the sn-2 position releasing arachidonic acid. Together with its lysophospholipid activity, it is implicated in the initiation of the inflammatory response. | |||
== Evolutionary Conservation == | |||
[[Image:Consurf_key_small.gif|200px|right]] | |||
Check<jmol> | |||
<jmolCheckbox> | |||
<scriptWhenChecked>; select protein; define ~consurf_to_do selected; consurf_initial_scene = true; script "/wiki/ConSurf/bc/1bci_consurf.spt"</scriptWhenChecked> | |||
<scriptWhenUnchecked>script /wiki/extensions/Proteopedia/spt/initialview01.spt</scriptWhenUnchecked> | |||
<text>to colour the structure by Evolutionary Conservation</text> | |||
</jmolCheckbox> | |||
</jmol>, as determined by [http://consurfdb.tau.ac.il/ ConSurfDB]. You may read the [[Conservation%2C_Evolutionary|explanation]] of the method and the full data available from [http://bental.tau.ac.il/new_ConSurfDB/main_output.php?pdb_ID=1bci ConSurf]. | |||
<div style="clear:both"></div> | |||
<div style="background-color:#fffaf0;"> | |||
== Publication Abstract from PubMed == | |||
The amino-terminal, 138 amino acid C2 domain of cytosolic phospholipase A2 (cPLA2-C2) mediates an initial step in the production of lipid mediators of inflammation: the Ca2+-dependent translocation of the enzyme to intracellular membranes with subsequent liberation of arachidonic acid. The high resolution solution structure of this Ca2+-dependent, lipid-binding domain (CaLB) has been determined using heteronuclear three-dimensional NMR spectroscopy. Secondary structure analysis, derived from several sets of spectroscopic data, shows that the domain is composed of eight antiparallel beta-strands with six interconnecting loops that fits the "type II" topology for C2 domains. Using a total of 2370 distance and torsional restraints, the structure was found to be a beta-sandwich in the "Greek key" motif. The solution structure of cPLA2-C2 domain is very similar to the X-ray crystal structure of the C2 domain of phospholipase-C-delta and phylogenetic analysis clarifies the structural role of highly conserved residues. Calorimetric studies further demonstrate that cPLA2-C2 binds two Ca2+ with observed Kds of approximately 2 microM in an entropically assisted process. Moreover, regions on cPLA2-C2 interacting with membranes were identified by 15N-HSQC-spectroscopy of cPLA2-C2 in the presence of low molecular weight lipid micelles. An extended binding site was identified that binds the phosphocholine headgroup in a Ca2+-dependent manner and also interacts with proximal regions of the membrane surface. Based upon these results, a structural model is presented for the mechanism of association of cPLA2 with its membrane substrate. | |||
Solution structure and membrane interactions of the C2 domain of cytosolic phospholipase A2.,Xu GY, McDonagh T, Yu HA, Nalefski EA, Clark JD, Cumming DA J Mol Biol. 1998 Jul 17;280(3):485-500. PMID:9665851<ref>PMID:9665851</ref> | |||
From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine.<br> | |||
</div> | |||
<div class="pdbe-citations 1bci" style="background-color:#fffaf0;"></div> | |||
==See Also== | |||
*[[Phospholipase A2 3D structures|Phospholipase A2 3D structures]] | |||
== References == | |||
<references/> | |||
__TOC__ | |||
</StructureSection> | |||
[[Category: Homo sapiens]] | [[Category: Homo sapiens]] | ||
[[Category: | [[Category: Large Structures]] | ||
[[Category: Clark JD]] | |||
[[Category: Clark | [[Category: Cumming DA]] | ||
[[Category: Cumming | [[Category: Mcdonagh T]] | ||
[[Category: Mcdonagh | [[Category: Nalefski EA]] | ||
[[Category: Nalefski | [[Category: Xu GY]] | ||
[[Category: Xu | [[Category: Yu HA]] | ||
[[Category: Yu | |||
Latest revision as of 11:17, 22 May 2024
C2 DOMAIN OF CYTOSOLIC PHOSPHOLIPASE A2, NMR, MINIMIZED AVERAGE STRUCTUREC2 DOMAIN OF CYTOSOLIC PHOSPHOLIPASE A2, NMR, MINIMIZED AVERAGE STRUCTURE
Structural highlights
FunctionPA24A_HUMAN Selectively hydrolyzes arachidonyl phospholipids in the sn-2 position releasing arachidonic acid. Together with its lysophospholipid activity, it is implicated in the initiation of the inflammatory response. Evolutionary Conservation Check, as determined by ConSurfDB. You may read the explanation of the method and the full data available from ConSurf. Publication Abstract from PubMedThe amino-terminal, 138 amino acid C2 domain of cytosolic phospholipase A2 (cPLA2-C2) mediates an initial step in the production of lipid mediators of inflammation: the Ca2+-dependent translocation of the enzyme to intracellular membranes with subsequent liberation of arachidonic acid. The high resolution solution structure of this Ca2+-dependent, lipid-binding domain (CaLB) has been determined using heteronuclear three-dimensional NMR spectroscopy. Secondary structure analysis, derived from several sets of spectroscopic data, shows that the domain is composed of eight antiparallel beta-strands with six interconnecting loops that fits the "type II" topology for C2 domains. Using a total of 2370 distance and torsional restraints, the structure was found to be a beta-sandwich in the "Greek key" motif. The solution structure of cPLA2-C2 domain is very similar to the X-ray crystal structure of the C2 domain of phospholipase-C-delta and phylogenetic analysis clarifies the structural role of highly conserved residues. Calorimetric studies further demonstrate that cPLA2-C2 binds two Ca2+ with observed Kds of approximately 2 microM in an entropically assisted process. Moreover, regions on cPLA2-C2 interacting with membranes were identified by 15N-HSQC-spectroscopy of cPLA2-C2 in the presence of low molecular weight lipid micelles. An extended binding site was identified that binds the phosphocholine headgroup in a Ca2+-dependent manner and also interacts with proximal regions of the membrane surface. Based upon these results, a structural model is presented for the mechanism of association of cPLA2 with its membrane substrate. Solution structure and membrane interactions of the C2 domain of cytosolic phospholipase A2.,Xu GY, McDonagh T, Yu HA, Nalefski EA, Clark JD, Cumming DA J Mol Biol. 1998 Jul 17;280(3):485-500. PMID:9665851[1] From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine. See AlsoReferences
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