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6b3i
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==Annexin A13a== | ==Annexin A13a== | ||
| - | <StructureSection load='6b3i' size='340' side='right' caption='[[6b3i]], [[Resolution|resolution]] 2.60Å' scene=''> | + | <StructureSection load='6b3i' size='340' side='right'caption='[[6b3i]], [[Resolution|resolution]] 2.60Å' scene=''> |
== Structural highlights == | == Structural highlights == | ||
| - | <table><tr><td colspan='2'>[[6b3i]] is a 3 chain structure. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=6B3I OCA]. For a <b>guided tour on the structure components</b> use [ | + | <table><tr><td colspan='2'>[[6b3i]] is a 3 chain structure with sequence from [https://en.wikipedia.org/wiki/Homo_sapiens Homo sapiens]. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=6B3I OCA]. For a <b>guided tour on the structure components</b> use [https://proteopedia.org/fgij/fg.htm?mol=6B3I FirstGlance]. <br> |
| - | </td></tr><tr id='ligand'><td class="sblockLbl"><b>[[Ligand|Ligands:]]</b></td><td class="sblockDat"><scene name='pdbligand=EDO:1,2-ETHANEDIOL'>EDO</scene></td></tr> | + | </td></tr><tr id='method'><td class="sblockLbl"><b>[[Empirical_models|Method:]]</b></td><td class="sblockDat" id="methodDat">X-ray diffraction, [[Resolution|Resolution]] 2.6Å</td></tr> |
| - | <tr id='resources'><td class="sblockLbl"><b>Resources:</b></td><td class="sblockDat"><span class='plainlinks'>[ | + | <tr id='ligand'><td class="sblockLbl"><b>[[Ligand|Ligands:]]</b></td><td class="sblockDat" id="ligandDat"><scene name='pdbligand=EDO:1,2-ETHANEDIOL'>EDO</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=6b3i FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=6b3i OCA], [https://pdbe.org/6b3i PDBe], [https://www.rcsb.org/pdb/explore.do?structureId=6b3i RCSB], [https://www.ebi.ac.uk/pdbsum/6b3i PDBsum], [https://prosat.h-its.org/prosat/prosatexe?pdbcode=6b3i ProSAT]</span></td></tr> | ||
</table> | </table> | ||
| + | == Function == | ||
| + | [https://www.uniprot.org/uniprot/ANX13_HUMAN ANX13_HUMAN] Binds to membranes enriched in phosphatidylserine or phosphatidylglycerol in a calcium-dependent manner (PubMed:27676605, PubMed:30610115). Half-maximal membrane binding requires about 60 uM calcium. Does not bind to membranes that lack phospholipids with an acidic headgroup (PubMed:27676605).<ref>PMID:27676605</ref> <ref>PMID:30610115</ref> Binds to membranes enriched in phosphatidylserine or phosphatidylglycerol in a calcium-dependent manner, but requires higher calcium levels for membrane binding than isoform A. Half-maximal membrane binding requires about 320 uM calcium.<ref>PMID:27676605</ref> | ||
| + | <div style="background-color:#fffaf0;"> | ||
| + | == Publication Abstract from PubMed == | ||
| + | Annexin proteins function as Ca(2+)-dependent regulators of membrane trafficking and repair that may also modulate membrane curvature. Here, using high-resolution confocal imaging, we report that the intestine-specific annexin A13 (ANX A13) localizes to the tips of intestinal microvilli and determined the crystal structure of the ANX A13a isoform to 2.6 A resolution. The structure revealed that the N terminus exhibits an alternative fold that converts the first two helices and the associated helix-loop-helix motif into a continuous alpha-helix, as stabilized by a domain-swapped dimer. We also found that the dimer is present in solution and partially occludes the membrane-binding surfaces of annexin, suggesting that dimerization may function as a means for regulating membrane binding. Accordingly, as revealed by in vitro binding and cellular localization assays, ANX A13a variants that favor a monomeric state exhibited increased membrane association relative to variants that favor the dimeric form. Together, our findings support a mechanism for how the association of the ANX A13a isoform with the membrane is regulated. | ||
| + | |||
| + | An alternative N-terminal fold of the intestine-specific annexin A13a induces dimerization and regulates membrane-binding.,McCulloch KM, Yamakawa I, Shifrin DA Jr, McConnell RE, Foegeding NJ, Singh PK, Mao S, Tyska MJ, Iverson TM J Biol Chem. 2019 Mar 8;294(10):3454-3463. doi: 10.1074/jbc.RA118.004571. Epub, 2019 Jan 4. PMID:30610115<ref>PMID:30610115</ref> | ||
| + | |||
| + | From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine.<br> | ||
| + | </div> | ||
| + | <div class="pdbe-citations 6b3i" style="background-color:#fffaf0;"></div> | ||
| + | == References == | ||
| + | <references/> | ||
__TOC__ | __TOC__ | ||
</StructureSection> | </StructureSection> | ||
| - | [[Category: | + | [[Category: Homo sapiens]] |
| - | [[Category: | + | [[Category: Large Structures]] |
| - | [[Category: | + | [[Category: Iverson TM]] |
| - | [[Category: | + | [[Category: McCulloch KM]] |
Current revision
Annexin A13a
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