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| | <StructureSection load='4c80' size='340' side='right'caption='[[4c80]], [[Resolution|resolution]] 1.50Å' scene=''> | | <StructureSection load='4c80' size='340' side='right'caption='[[4c80]], [[Resolution|resolution]] 1.50Å' scene=''> |
| | == Structural highlights == | | == Structural highlights == |
| - | <table><tr><td colspan='2'>[[4c80]] is a 1 chain structure with sequence from [http://en.wikipedia.org/wiki/Desulfovibrio_gigas Desulfovibrio gigas]. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=4C80 OCA]. For a <b>guided tour on the structure components</b> use [http://proteopedia.org/fgij/fg.htm?mol=4C80 FirstGlance]. <br> | + | <table><tr><td colspan='2'>[[4c80]] is a 1 chain structure with sequence from [https://en.wikipedia.org/wiki/Megalodesulfovibrio_gigas Megalodesulfovibrio gigas]. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=4C80 OCA]. For a <b>guided tour on the structure components</b> use [https://proteopedia.org/fgij/fg.htm?mol=4C80 FirstGlance]. <br> |
| - | </td></tr><tr id='ligand'><td class="sblockLbl"><b>[[Ligand|Ligands:]]</b></td><td class="sblockDat" id="ligandDat"><scene name='pdbligand=BCT:BICARBONATE+ION'>BCT</scene>, <scene name='pdbligand=CL:CHLORIDE+ION'>CL</scene>, <scene name='pdbligand=FES:FE2/S2+(INORGANIC)+CLUSTER'>FES</scene>, <scene name='pdbligand=IPA:ISOPROPYL+ALCOHOL'>IPA</scene>, <scene name='pdbligand=MG:MAGNESIUM+ION'>MG</scene>, <scene name='pdbligand=NA:SODIUM+ION'>NA</scene>, <scene name='pdbligand=PCD:(MOLYBDOPTERIN-CYTOSINE+DINUCLEOTIDE-S,S)-DIOXO-AQUA-MOLYBDENUM(V)'>PCD</scene>, <scene name='pdbligand=PEO:HYDROGEN+PEROXIDE'>PEO</scene></td></tr> | + | </td></tr><tr id='ligand'><td class="sblockLbl"><b>[[Ligand|Ligands:]]</b></td><td class="sblockDat" id="ligandDat"><scene name='pdbligand=BCT:BICARBONATE+ION'>BCT</scene>, <scene name='pdbligand=CL:CHLORIDE+ION'>CL</scene>, <scene name='pdbligand=CSO:S-HYDROXYCYSTEINE'>CSO</scene>, <scene name='pdbligand=FES:FE2/S2+(INORGANIC)+CLUSTER'>FES</scene>, <scene name='pdbligand=IPA:ISOPROPYL+ALCOHOL'>IPA</scene>, <scene name='pdbligand=MG:MAGNESIUM+ION'>MG</scene>, <scene name='pdbligand=NA:SODIUM+ION'>NA</scene>, <scene name='pdbligand=PCD:(MOLYBDOPTERIN-CYTOSINE+DINUCLEOTIDE-S,S)-DIOXO-AQUA-MOLYBDENUM(V)'>PCD</scene>, <scene name='pdbligand=PEO:HYDROGEN+PEROXIDE'>PEO</scene></td></tr> |
| - | <tr id='NonStdRes'><td class="sblockLbl"><b>[[Non-Standard_Residue|NonStd Res:]]</b></td><td class="sblockDat"><scene name='pdbligand=CSO:S-HYDROXYCYSTEINE'>CSO</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=4c80 FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=4c80 OCA], [https://pdbe.org/4c80 PDBe], [https://www.rcsb.org/pdb/explore.do?structureId=4c80 RCSB], [https://www.ebi.ac.uk/pdbsum/4c80 PDBsum], [https://prosat.h-its.org/prosat/prosatexe?pdbcode=4c80 ProSAT]</span></td></tr> |
| - | <tr id='related'><td class="sblockLbl"><b>[[Related_structure|Related:]]</b></td><td class="sblockDat">[[4c7y|4c7y]], [[4c7z|4c7z]]</td></tr>
| + | |
| - | <tr id='activity'><td class="sblockLbl"><b>Activity:</b></td><td class="sblockDat"><span class='plainlinks'>[http://en.wikipedia.org/wiki/Aldehyde_dehydrogenase_(FAD-independent) Aldehyde dehydrogenase (FAD-independent)], with EC number [http://www.brenda-enzymes.info/php/result_flat.php4?ecno=1.2.99.7 1.2.99.7] </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=4c80 FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=4c80 OCA], [http://pdbe.org/4c80 PDBe], [http://www.rcsb.org/pdb/explore.do?structureId=4c80 RCSB], [http://www.ebi.ac.uk/pdbsum/4c80 PDBsum], [http://prosat.h-its.org/prosat/prosatexe?pdbcode=4c80 ProSAT]</span></td></tr> | + | |
| | </table> | | </table> |
| - | <div style="background-color:#fffaf0;">
| + | == Function == |
| - | == Publication Abstract from PubMed == | + | [[https://www.uniprot.org/uniprot/MOP_MEGGA MOP_MEGGA]] |
| - | Mononuclear Mo-containing enzymes of the xanthine oxidase (XO) family catalyze the oxidative hydroxylation of aldehydes and heterocyclic compounds. The molybdenum active site shows a distorted square-pyramidal geometry in which two ligands, a hydroxyl/water molecule (the catalytic labile site) and a sulfido ligand, have been shown to be essential for catalysis. The XO family member aldehyde oxidoreductase from Desulfovibrio gigas (DgAOR) is an exception as presents in its catalytically competent form an equatorial oxo ligand instead of the sulfido ligand. Despite this structural difference, inactive samples of DgAOR can be activated upon incubation with dithionite plus sulfide, a procedure similar to that used for activation of desulfo-XO. The fact that DgAOR does not need a sulfido ligand for catalysis indicates that the process leading to the activation of inactive DgAOR samples is different to that of desulfo-XO. We now report a combined kinetic and X-ray crystallographic study to unveil the enzyme modification responsible for the inactivation and the chemistry that occurs at the Mo site when DgAOR is activated. In contrast to XO, which is activated by resulfuration of the Mo site, DgAOR activation/inactivation is governed by the oxidation state of the dithiolene moiety of the pyranopterin cofactor, which demonstrates the non-innocent behavior of the pyranopterin in enzyme activity. We also showed that DgAOR incubation with dithionite plus sulfide in the presence of dioxygen produces hydrogen peroxide not associated with the enzyme activation. The peroxide molecule coordinates to molybdenum in a eta(2) fashion inhibiting the enzyme activity.
| + | |
| - | | + | |
| - | Kinetic and Structural Studies of Aldehyde Oxidoreductase from Desulfovibrio gigas Reveal a Dithiolene-Based Chemistry for Enzyme Activation and Inhibition by H2O2.,Marangon J, Correia HD, Brondino CD, Moura JJ, Romao MJ, Gonzalez PJ, Santos-Silva T PLoS One. 2013 Dec 31;8(12):e83234. doi: 10.1371/journal.pone.0083234. PMID:24391748<ref>PMID:24391748</ref>
| + | |
| - | | + | |
| - | From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine.<br>
| + | |
| - | </div>
| + | |
| - | <div class="pdbe-citations 4c80" style="background-color:#fffaf0;"></div>
| + | |
| - | == References ==
| + | |
| - | <references/>
| + | |
| | __TOC__ | | __TOC__ |
| | </StructureSection> | | </StructureSection> |
| - | [[Category: Desulfovibrio gigas]] | |
| | [[Category: Large Structures]] | | [[Category: Large Structures]] |
| - | [[Category: Correia, H D]] | + | [[Category: Megalodesulfovibrio gigas]] |
| - | [[Category: Romao, M J]] | + | [[Category: Correia HD]] |
| - | [[Category: Santos-Silva, T]] | + | [[Category: Romao MJ]] |
| - | [[Category: Activation]] | + | [[Category: Santos-Silva T]] |
| - | [[Category: Inactivation]]
| + | |
| - | [[Category: Molybdenum enzyme]]
| + | |
| - | [[Category: Mop]]
| + | |
| - | [[Category: Oxidoreductase]]
| + | |
