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2gwc
From Proteopedia
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| - | [[Image:2gwc.gif|left|200px]] | ||
| - | + | ==Crystal structure of plant glutamate cysteine ligase in complex with a transition state analogue== | |
| - | + | <StructureSection load='2gwc' size='340' side='right'caption='[[2gwc]], [[Resolution|resolution]] 2.18Å' scene=''> | |
| - | + | == Structural highlights == | |
| - | | | + | <table><tr><td colspan='2'>[[2gwc]] is a 8 chain structure with sequence from [https://en.wikipedia.org/wiki/Braju Braju]. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=2GWC OCA]. For a <b>guided tour on the structure components</b> use [https://proteopedia.org/fgij/fg.htm?mol=2GWC FirstGlance]. <br> |
| - | | | + | </td></tr><tr id='ligand'><td class="sblockLbl"><b>[[Ligand|Ligands:]]</b></td><td class="sblockDat" id="ligandDat"><scene name='pdbligand=BSC:(S)-2-AMINO-4-(AMINO-BUTYLHYDROSULFINYL)BUTANOIC+ACID'>BSC</scene>, <scene name='pdbligand=MG:MAGNESIUM+ION'>MG</scene></td></tr> |
| - | + | <tr id='NonStdRes'><td class="sblockLbl"><b>[[Non-Standard_Residue|NonStd Res:]]</b></td><td class="sblockDat"><scene name='pdbligand=MSE:SELENOMETHIONINE'>MSE</scene></td></tr> | |
| - | + | <tr id='gene'><td class="sblockLbl"><b>[[Gene|Gene:]]</b></td><td class="sblockDat">GSH1 ([https://www.ncbi.nlm.nih.gov/Taxonomy/Browser/wwwtax.cgi?mode=Info&srchmode=5&id=3707 BRAJU])</td></tr> | |
| - | + | <tr id='activity'><td class="sblockLbl"><b>Activity:</b></td><td class="sblockDat"><span class='plainlinks'>[https://en.wikipedia.org/wiki/Glutamate--cysteine_ligase Glutamate--cysteine ligase], with EC number [https://www.brenda-enzymes.info/php/result_flat.php4?ecno=6.3.2.2 6.3.2.2] </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=2gwc FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=2gwc OCA], [https://pdbe.org/2gwc PDBe], [https://www.rcsb.org/pdb/explore.do?structureId=2gwc RCSB], [https://www.ebi.ac.uk/pdbsum/2gwc PDBsum], [https://prosat.h-its.org/prosat/prosatexe?pdbcode=2gwc ProSAT]</span></td></tr> | |
| - | + | </table> | |
| - | + | == Function == | |
| - | + | [[https://www.uniprot.org/uniprot/GSH1_BRAJU GSH1_BRAJU]] Participates in the detoxification process.<ref>PMID:9620267</ref> <ref>PMID:9119067</ref> | |
| - | + | == 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/gw/2gwc_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=2gwc ConSurf]. | ||
| + | <div style="clear:both"></div> | ||
| + | <div style="background-color:#fffaf0;"> | ||
| + | == Publication Abstract from PubMed == | ||
Glutathione (GSH) plays a crucial role in plant metabolism and stress response. The rate-limiting step in the biosynthesis of GSH is catalyzed by glutamate cysteine ligase (GCL) the activity of which is tightly regulated. The regulation of plant GCLs is poorly understood. The crystal structure of substrate-bound GCL from Brassica juncea at 2.1-A resolution reveals a plant-unique regulatory mechanism based on two intramolecular redox-sensitive disulfide bonds. Reduction of one disulfide bond allows a beta-hairpin motif to shield the active site of B. juncea GCL, thereby preventing the access of substrates. Reduction of the second disulfide bond reversibly controls dimer to monomer transition of B. juncea GCL that is associated with a significant inactivation of the enzyme. These regulatory events provide a molecular link between high GSH levels in the plant cell and associated down-regulation of its biosynthesis. Furthermore, known mutations in the Arabidopsis GCL gene affect residues in the close proximity of the active site and thus explain the decreased GSH levels in mutant plants. In particular, the mutation in rax1-1 plants causes impaired binding of cysteine. | Glutathione (GSH) plays a crucial role in plant metabolism and stress response. The rate-limiting step in the biosynthesis of GSH is catalyzed by glutamate cysteine ligase (GCL) the activity of which is tightly regulated. The regulation of plant GCLs is poorly understood. The crystal structure of substrate-bound GCL from Brassica juncea at 2.1-A resolution reveals a plant-unique regulatory mechanism based on two intramolecular redox-sensitive disulfide bonds. Reduction of one disulfide bond allows a beta-hairpin motif to shield the active site of B. juncea GCL, thereby preventing the access of substrates. Reduction of the second disulfide bond reversibly controls dimer to monomer transition of B. juncea GCL that is associated with a significant inactivation of the enzyme. These regulatory events provide a molecular link between high GSH levels in the plant cell and associated down-regulation of its biosynthesis. Furthermore, known mutations in the Arabidopsis GCL gene affect residues in the close proximity of the active site and thus explain the decreased GSH levels in mutant plants. In particular, the mutation in rax1-1 plants causes impaired binding of cysteine. | ||
| - | + | Structural basis for the redox control of plant glutamate cysteine ligase.,Hothorn M, Wachter A, Gromes R, Stuwe T, Rausch T, Scheffzek K J Biol Chem. 2006 Sep 15;281(37):27557-65. Epub 2006 Jun 9. PMID:16766527<ref>PMID:16766527</ref> | |
| - | + | ||
| - | + | From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine.<br> | |
| - | + | </div> | |
| - | [[Category: | + | <div class="pdbe-citations 2gwc" style="background-color:#fffaf0;"></div> |
| + | == References == | ||
| + | <references/> | ||
| + | __TOC__ | ||
| + | </StructureSection> | ||
| + | [[Category: Braju]] | ||
[[Category: Glutamate--cysteine ligase]] | [[Category: Glutamate--cysteine ligase]] | ||
| - | [[Category: | + | [[Category: Large Structures]] |
| - | [[Category: Gromes, R | + | [[Category: Gromes, R]] |
| - | [[Category: Hothorn, M | + | [[Category: Hothorn, M]] |
| - | [[Category: Rausch, T | + | [[Category: Rausch, T]] |
| - | [[Category: Scheffzek, K | + | [[Category: Scheffzek, K]] |
| - | [[Category: Stuwe, T | + | [[Category: Stuwe, T]] |
| - | [[Category: Wachter, A | + | [[Category: Wachter, A]] |
| - | [[Category: | + | [[Category: Beta-hairpin]] |
| - | [[Category: | + | [[Category: Disulfide bridge]] |
| - | [[Category: | + | [[Category: Glutathione biosynthesis]] |
| - | [[Category: | + | [[Category: Ligase]] |
| - | + | [[Category: Redox regulation]] | |
| - | + | ||
Current revision
Crystal structure of plant glutamate cysteine ligase in complex with a transition state analogue
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