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| | <SX load='5u3c' size='340' side='right' viewer='molstar' caption='[[5u3c]], [[Resolution|resolution]] 4.60Å' scene=''> | | <SX load='5u3c' size='340' side='right' viewer='molstar' caption='[[5u3c]], [[Resolution|resolution]] 4.60Å' scene=''> |
| | == Structural highlights == | | == Structural highlights == |
| - | <table><tr><td colspan='2'>[[5u3c]] is a 4 chain structure. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=5U3C OCA]. For a <b>guided tour on the structure components</b> use [http://proteopedia.org/fgij/fg.htm?mol=5U3C FirstGlance]. <br> | + | <table><tr><td colspan='2'>[[5u3c]] is a 4 chain structure with sequence from [https://en.wikipedia.org/wiki/Escherichia_coli Escherichia coli]. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=5U3C OCA]. For a <b>guided tour on the structure components</b> use [https://proteopedia.org/fgij/fg.htm?mol=5U3C FirstGlance]. <br> |
| - | </td></tr><tr id='ligand'><td class="sblockLbl"><b>[[Ligand|Ligands:]]</b></td><td class="sblockDat" id="ligandDat"><scene name='pdbligand=ADP:ADENOSINE-5-DIPHOSPHATE'>ADP</scene>, <scene name='pdbligand=CTP:CYTIDINE-5-TRIPHOSPHATE'>CTP</scene></td></tr> | + | </td></tr><tr id='method'><td class="sblockLbl"><b>[[Empirical_models|Method:]]</b></td><td class="sblockDat" id="methodDat">Electron Microscopy, [[Resolution|Resolution]] 4.6Å</td></tr> |
| - | <tr id='related'><td class="sblockLbl"><b>[[Related_structure|Related:]]</b></td><td class="sblockDat">[[5u6r|5u6r]]</td></tr> | + | <tr id='ligand'><td class="sblockLbl"><b>[[Ligand|Ligands:]]</b></td><td class="sblockDat" id="ligandDat"><scene name='pdbligand=ADP:ADENOSINE-5-DIPHOSPHATE'>ADP</scene>, <scene name='pdbligand=CTP:CYTIDINE-5-TRIPHOSPHATE'>CTP</scene></td></tr> |
| - | <tr id='activity'><td class="sblockLbl"><b>Activity:</b></td><td class="sblockDat"><span class='plainlinks'>[http://en.wikipedia.org/wiki/CTP_synthase_(glutamine_hydrolyzing) CTP synthase (glutamine hydrolyzing)], with EC number [http://www.brenda-enzymes.info/php/result_flat.php4?ecno=6.3.4.2 6.3.4.2] </span></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=5u3c FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=5u3c OCA], [https://pdbe.org/5u3c PDBe], [https://www.rcsb.org/pdb/explore.do?structureId=5u3c RCSB], [https://www.ebi.ac.uk/pdbsum/5u3c PDBsum], [https://prosat.h-its.org/prosat/prosatexe?pdbcode=5u3c ProSAT]</span></td></tr> |
| - | <tr id='resources'><td class="sblockLbl"><b>Resources:</b></td><td class="sblockDat"><span class='plainlinks'>[http://proteopedia.org/fgij/fg.htm?mol=5u3c FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=5u3c OCA], [http://pdbe.org/5u3c PDBe], [http://www.rcsb.org/pdb/explore.do?structureId=5u3c RCSB], [http://www.ebi.ac.uk/pdbsum/5u3c PDBsum], [http://prosat.h-its.org/prosat/prosatexe?pdbcode=5u3c ProSAT]</span></td></tr> | + | |
| | </table> | | </table> |
| | == Function == | | == Function == |
| - | [[http://www.uniprot.org/uniprot/PYRG_ECO45 PYRG_ECO45]] Catalyzes the ATP-dependent amination of UTP to CTP with either L-glutamine or ammonia as the source of nitrogen. Regulates intracellular CTP levels through interactions with the four ribonucleotide triphosphates. | + | [https://www.uniprot.org/uniprot/PYRG_ECOLI PYRG_ECOLI] Catalyzes the ATP-dependent amination of UTP to CTP with either L-glutamine or ammonia as the source of nitrogen.[HAMAP-Rule:MF_01227] |
| - | <div style="background-color:#fffaf0;">
| + | |
| - | == Publication Abstract from PubMed ==
| + | |
| - | The universally conserved enzyme CTP synthase (CTPS) forms filaments in bacteria and eukaryotes. In bacteria, polymerization inhibits CTPS activity and is required for nucleotide homeostasis. Here we show that for human CTPS, polymerization increases catalytic activity. The cryo-EM structures of bacterial and human CTPS filaments differ considerably in overall architecture and in the conformation of the CTPS protomer, explaining the divergent consequences of polymerization on activity. The structure of human CTPS filament, the first structure of the full-length human enzyme, reveals a novel active conformation. The filament structures elucidate allosteric mechanisms of assembly and regulation that rely on a conserved conformational equilibrium. The findings may provide a mechanism for increasing human CTPS activity in response to metabolic state and challenge the assumption that metabolic filaments are generally storage forms of inactive enzymes. Allosteric regulation of CTPS polymerization by ligands likely represents a fundamental mechanism underlying assembly of other metabolic filaments.
| + | |
| - | | + | |
| - | Human CTP synthase filament structure reveals the active enzyme conformation.,Lynch EM, Hicks DR, Shepherd M, Endrizzi JA, Maker A, Hansen JM, Barry RM, Gitai Z, Baldwin EP, Kollman JM Nat Struct Mol Biol. 2017 May 1. doi: 10.1038/nsmb.3407. PMID:28459447<ref>PMID:28459447</ref>
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| - | | + | |
| - | From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine.<br>
| + | |
| - | </div>
| + | |
| - | <div class="pdbe-citations 5u3c" style="background-color:#fffaf0;"></div>
| + | |
| - | == References ==
| + | |
| - | <references/>
| + | |
| | __TOC__ | | __TOC__ |
| | </SX> | | </SX> |
| | + | [[Category: Escherichia coli]] |
| | [[Category: Large Structures]] | | [[Category: Large Structures]] |
| - | [[Category: Kollman, J M]] | + | [[Category: Kollman JM]] |
| - | [[Category: Lynch, E M]] | + | [[Category: Lynch EM]] |
| - | [[Category: Ligase]]
| + | |
| - | [[Category: Metabolic filament]]
| + | |
| - | [[Category: Nucleotide metabolism]]
| + | |
| - | [[Category: Protein fibril]]
| + | |
