8ero
From Proteopedia
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| - | '''Unreleased structure''' | ||
| - | + | ==Structure of Xenopus cholinephosphotransferase1 in complex with CDP== | |
| + | <StructureSection load='8ero' size='340' side='right'caption='[[8ero]], [[Resolution|resolution]] 3.20Å' scene=''> | ||
| + | == Structural highlights == | ||
| + | <table><tr><td colspan='2'>[[8ero]] is a 2 chain structure with sequence from [https://en.wikipedia.org/wiki/Xenopus_laevis Xenopus laevis]. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=8ERO OCA]. For a <b>guided tour on the structure components</b> use [https://proteopedia.org/fgij/fg.htm?mol=8ERO FirstGlance]. <br> | ||
| + | </td></tr><tr id='method'><td class="sblockLbl"><b>[[Empirical_models|Method:]]</b></td><td class="sblockDat" id="methodDat">Electron Microscopy, [[Resolution|Resolution]] 3.2Å</td></tr> | ||
| + | <tr id='ligand'><td class="sblockLbl"><b>[[Ligand|Ligands:]]</b></td><td class="sblockDat" id="ligandDat"><scene name='pdbligand=CDP:CYTIDINE-5-DIPHOSPHATE'>CDP</scene>, <scene name='pdbligand=LBN:(2R)-3-(hexadecanoyloxy)-2-{[(9Z)-octadec-9-enoyl]oxy}propyl+2-(trimethylazaniumyl)ethyl+phosphate'>LBN</scene>, <scene name='pdbligand=MG:MAGNESIUM+ION'>MG</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=8ero FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=8ero OCA], [https://pdbe.org/8ero PDBe], [https://www.rcsb.org/pdb/explore.do?structureId=8ero RCSB], [https://www.ebi.ac.uk/pdbsum/8ero PDBsum], [https://prosat.h-its.org/prosat/prosatexe?pdbcode=8ero ProSAT]</span></td></tr> | ||
| + | </table> | ||
| + | == Function == | ||
| + | [https://www.uniprot.org/uniprot/CHPT1_XENLA CHPT1_XENLA] Catalyzes the final step of de novo phosphatidylcholine (PC) synthesis, i.e. the transfer of choline phosphate from CDP-choline to the free hydroxyl of a diacylglycerol (DAG), producing a PC (PubMed:37179328). It thereby plays a central role in the formation and maintenance of vesicular membranes (By similarity). Shows a high preference for CDP-choline over CDP-ethanolamine as substrate (PubMed:37179328).[UniProtKB:Q8WUD6]<ref>PMID:37179328</ref> | ||
| + | <div style="background-color:#fffaf0;"> | ||
| + | == Publication Abstract from PubMed == | ||
| + | Phosphatidylcholine (PC) is the most abundant phospholipid in eukaryotic cell membranes. In eukaryotes, two highly homologous enzymes, cholinephosphotransferase-1 (CHPT1) and choline/ethanolamine phosphotransferase-1 (CEPT1) catalyze the final step of de novo PC synthesis. CHPT1/CEPT1 joins two substrates, cytidine diphosphate-choline (CDP-choline) and diacylglycerol (DAG), to produce PC, and Mg(2+) is required for the reaction. However, mechanisms of substrate recognition and catalysis remain unresolved. Here we report structures of a CHPT1 from Xenopus laevis (xlCHPT1) determined by cryo-electron microscopy to an overall resolution of ~3.2 A. xlCHPT1 forms a homodimer, and each protomer has 10 transmembrane helices (TMs). The first 6 TMs carve out a cone-shaped enclosure in the membrane in which the catalysis occurs. The enclosure opens to the cytosolic side, where a CDP-choline and two Mg(2+) are coordinated. The structures identify a catalytic site unique to eukaryotic CHPT1/CEPT1 and suggest an entryway for DAG. The structures also reveal an internal pseudo two-fold symmetry between TM3-6 and TM7-10, and suggest that CHPT1/CEPT1 may have evolved from their distant prokaryotic ancestors through gene duplication. | ||
| - | + | Structure of a eukaryotic cholinephosphotransferase-1 reveals mechanisms of substrate recognition and catalysis.,Wang L, Zhou M Nat Commun. 2023 May 13;14(1):2753. doi: 10.1038/s41467-023-38003-9. PMID:37179328<ref>PMID:37179328</ref> | |
| - | + | From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine.<br> | |
| - | [[Category: | + | </div> |
| + | <div class="pdbe-citations 8ero" style="background-color:#fffaf0;"></div> | ||
| + | == References == | ||
| + | <references/> | ||
| + | __TOC__ | ||
| + | </StructureSection> | ||
| + | [[Category: Large Structures]] | ||
| + | [[Category: Xenopus laevis]] | ||
| + | [[Category: Wang L]] | ||
| + | [[Category: Zhou M]] | ||
Current revision
Structure of Xenopus cholinephosphotransferase1 in complex with CDP
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