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| ==Crystal Structure of Aspartate Kinase from Synechocystis== | | ==Crystal Structure of Aspartate Kinase from Synechocystis== |
| <StructureSection load='3l76' size='340' side='right' caption='[[3l76]], [[Resolution|resolution]] 2.54Å' scene=''> | | <StructureSection load='3l76' size='340' side='right'caption='[[3l76]], [[Resolution|resolution]] 2.54Å' scene=''> |
| == Structural highlights == | | == Structural highlights == |
| <table><tr><td colspan='2'>[[3l76]] is a 2 chain structure with sequence from [http://en.wikipedia.org/wiki/Aphanocapsa_sp._(strain_n-1) Aphanocapsa sp. (strain n-1)]. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=3L76 OCA]. For a <b>guided tour on the structure components</b> use [http://oca.weizmann.ac.il/oca-docs/fgij/fg.htm?mol=3L76 FirstGlance]. <br> | | <table><tr><td colspan='2'>[[3l76]] is a 2 chain structure with sequence from [https://en.wikipedia.org/wiki/Synechocystis_sp._PCC_6803 Synechocystis sp. PCC 6803]. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=3L76 OCA]. For a <b>guided tour on the structure components</b> use [https://proteopedia.org/fgij/fg.htm?mol=3L76 FirstGlance]. <br> |
| </td></tr><tr id='ligand'><td class="sblockLbl"><b>[[Ligand|Ligands:]]</b></td><td class="sblockDat"><scene name='pdbligand=LYS:LYSINE'>LYS</scene>, <scene name='pdbligand=SO4:SULFATE+ION'>SO4</scene>, <scene name='pdbligand=THR:THREONINE'>THR</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]] 2.54Å</td></tr> |
| <tr id='gene'><td class="sblockLbl"><b>[[Gene|Gene:]]</b></td><td class="sblockDat">lysC, slr0657 ([http://www.ncbi.nlm.nih.gov/Taxonomy/Browser/wwwtax.cgi?mode=Info&srchmode=5&id=1148 Aphanocapsa sp. (strain N-1)])</td></tr> | | <tr id='ligand'><td class="sblockLbl"><b>[[Ligand|Ligands:]]</b></td><td class="sblockDat" id="ligandDat"><scene name='pdbligand=LYS:LYSINE'>LYS</scene>, <scene name='pdbligand=SO4:SULFATE+ION'>SO4</scene>, <scene name='pdbligand=THR:THREONINE'>THR</scene></td></tr> |
| <tr id='activity'><td class="sblockLbl"><b>Activity:</b></td><td class="sblockDat"><span class='plainlinks'>[http://en.wikipedia.org/wiki/Aspartate_kinase Aspartate kinase], with EC number [http://www.brenda-enzymes.info/php/result_flat.php4?ecno=2.7.2.4 2.7.2.4] </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=3l76 FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=3l76 OCA], [https://pdbe.org/3l76 PDBe], [https://www.rcsb.org/pdb/explore.do?structureId=3l76 RCSB], [https://www.ebi.ac.uk/pdbsum/3l76 PDBsum], [https://prosat.h-its.org/prosat/prosatexe?pdbcode=3l76 ProSAT]</span></td></tr> |
| <tr id='resources'><td class="sblockLbl"><b>Resources:</b></td><td class="sblockDat"><span class='plainlinks'>[http://oca.weizmann.ac.il/oca-docs/fgij/fg.htm?mol=3l76 FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=3l76 OCA], [http://pdbe.org/3l76 PDBe], [http://www.rcsb.org/pdb/explore.do?structureId=3l76 RCSB], [http://www.ebi.ac.uk/pdbsum/3l76 PDBsum], [http://prosat.h-its.org/prosat/prosatexe?pdbcode=3l76 ProSAT]</span></td></tr> | |
| </table> | | </table> |
| | == Function == |
| | [https://www.uniprot.org/uniprot/P74569_SYNY3 P74569_SYNY3] |
| == Evolutionary Conservation == | | == Evolutionary Conservation == |
| [[Image:Consurf_key_small.gif|200px|right]] | | [[Image:Consurf_key_small.gif|200px|right]] |
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| </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=3l76 ConSurf]. | | </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=3l76 ConSurf]. |
| <div style="clear:both"></div> | | <div style="clear:both"></div> |
| <div style="background-color:#fffaf0;">
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| == Publication Abstract from PubMed ==
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| Aspartate kinases (AKs) can be divided in two subhomology divisions, AKalpha and AKbeta, depending on the presence of an extra sequence of about 60 amino acids, which is found only in the N-terminus of all AKalpha's. To date, the structures of AKalpha failed to provide a role for this additional N-terminal sequence. In this study, the structure of the AKbeta from the Cyanobacteria Synechocystis reveals that this supplementary sequence is linked to the dimerization mode of AKs. Its absence in AKbeta leads to the dimerization by the catalytic domain instead of involving the ACT domains [Pfam 01842; small regulatory domains initially found in AK, chorismate mutase and TyrA (prephenate dehydrogenase)] as observed in AKalpha. Thus, the structural analysis of the Synechocystis AKbeta revealed a dimer with a novel architecture. The four ACT domains of each monomer interact together and do not make any contact with those of the second monomer. The enzyme is inhibited synergistically by threonine and lysine with the binding of threonine first. The interaction between ACT1 and ACT4 or between ACT2 and ACT3 generates a threonine binding site and a lysine binding site at each interface, making a total of eight regulatory sites per dimer and allowing a fine-tuning of the AK activity by the end products, threonine and lysine.
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| A new mode of dimerization of allosteric enzymes with ACT domains revealed by the crystal structure of the aspartate kinase from Cyanobacteria.,Robin AY, Cobessi D, Curien G, Robert-Genthon M, Ferrer JL, Dumas R J Mol Biol. 2010 Jun 4;399(2):283-93. Epub 2010 Apr 14. PMID:20398676<ref>PMID:20398676</ref>
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| From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine.<br>
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| </div>
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| <div class="pdbe-citations 3l76" style="background-color:#fffaf0;"></div>
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| == References ==
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| <references/>
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| __TOC__ | | __TOC__ |
| </StructureSection> | | </StructureSection> |
| [[Category: Aspartate kinase]] | | [[Category: Large Structures]] |
| [[Category: Cobessi, D]] | | [[Category: Synechocystis sp. PCC 6803]] |
| [[Category: Curien, G]] | | [[Category: Cobessi D]] |
| [[Category: Dumas, R]] | | [[Category: Curien G]] |
| [[Category: Ferrer, J L]] | | [[Category: Dumas R]] |
| [[Category: Robert-Genthon, M]] | | [[Category: Ferrer J-L]] |
| [[Category: Robin, A]] | | [[Category: Robert-Genthon M]] |
| [[Category: Act domain]]
| | [[Category: Robin A]] |
| [[Category: Allostery]]
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| [[Category: Aspartokinase]]
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| [[Category: Kinase]]
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| [[Category: Synechocysti]]
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| [[Category: Transferase]]
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