1aom

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[[Image:1aom.jpg|left|200px]]
 
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==SUBSTRATE AND PRODUCT BOUND TO CYTOCHROME CD1 NITRITE REDUCTASE==
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The line below this paragraph, containing "STRUCTURE_1aom", creates the "Structure Box" on the page.
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<StructureSection load='1aom' size='340' side='right'caption='[[1aom]], [[Resolution|resolution]] 1.80&Aring;' scene=''>
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You may change the PDB parameter (which sets the PDB file loaded into the applet)
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== Structural highlights ==
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or the SCENE parameter (which sets the initial scene displayed when the page is loaded),
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<table><tr><td colspan='2'>[[1aom]] is a 2 chain structure with sequence from [https://en.wikipedia.org/wiki/Paracoccus_pantotrophus Paracoccus pantotrophus]. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=1AOM OCA]. For a <b>guided tour on the structure components</b> use [https://proteopedia.org/fgij/fg.htm?mol=1AOM FirstGlance]. <br>
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or leave the SCENE parameter empty for the default display.
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</td></tr><tr id='method'><td class="sblockLbl"><b>[[Empirical_models|Method:]]</b></td><td class="sblockDat" id="methodDat">X-ray diffraction, [[Resolution|Resolution]] 1.8&#8491;</td></tr>
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<tr id='ligand'><td class="sblockLbl"><b>[[Ligand|Ligands:]]</b></td><td class="sblockDat" id="ligandDat"><scene name='pdbligand=2NO:NITROGEN+DIOXIDE'>2NO</scene>, <scene name='pdbligand=DHE:HEME+D'>DHE</scene>, <scene name='pdbligand=HEM:PROTOPORPHYRIN+IX+CONTAINING+FE'>HEM</scene>, <scene name='pdbligand=NO:NITRIC+OXIDE'>NO</scene></td></tr>
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{{STRUCTURE_1aom| PDB=1aom | SCENE= }}
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<tr id='resources'><td class="sblockLbl"><b>Resources:</b></td><td class="sblockDat"><span class='plainlinks'>[https://proteopedia.org/fgij/fg.htm?mol=1aom FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=1aom OCA], [https://pdbe.org/1aom PDBe], [https://www.rcsb.org/pdb/explore.do?structureId=1aom RCSB], [https://www.ebi.ac.uk/pdbsum/1aom PDBsum], [https://prosat.h-its.org/prosat/prosatexe?pdbcode=1aom ProSAT]</span></td></tr>
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</table>
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== Function ==
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[https://www.uniprot.org/uniprot/NIRS_PARPN NIRS_PARPN]
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== Evolutionary Conservation ==
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[[Image:Consurf_key_small.gif|200px|right]]
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Check<jmol>
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<jmolCheckbox>
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<scriptWhenChecked>; select protein; define ~consurf_to_do selected; consurf_initial_scene = true; script "/wiki/ConSurf/ao/1aom_consurf.spt"</scriptWhenChecked>
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<scriptWhenUnchecked>script /wiki/extensions/Proteopedia/spt/initialview03.spt</scriptWhenUnchecked>
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<text>to colour the structure by Evolutionary Conservation</text>
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</jmolCheckbox>
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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=1aom ConSurf].
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<div style="clear:both"></div>
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<div style="background-color:#fffaf0;">
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== Publication Abstract from PubMed ==
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Cytochrome cd1 nitrite reductase catalyses the conversion of nitrite to nitric oxide in the nitrogen cycle. The crystal structure of the oxidized enzyme shows that the d1 haem iron of the active site is ligated by His/Tyr side chains, and the c haem iron is ligated by a His/His ligand pair. Here we show that both haems undergo re-ligation during catalysis. Upon reduction, the tyrosine ligand of the d1 haem is released to allow substrate binding. Concomitantly, a refolding of the cytochrome c domain takes place, resulting in an unexpected change of the c haem iron coordination from His 17/His 69 to Met106/His69. This step is similar to the last steps in the folding of cytochrome c. The changes must affect the redox potential of the haems, and suggest a mechanism by which internal electron transfer is regulated. Structures of reaction intermediates show how nitric oxide is formed and expelled from the active-site iron, as well as how both haems return to their starting coordination. These results show how redox energy can be switched into conformational energy within a haem protein.
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'''SUBSTRATE AND PRODUCT BOUND TO CYTOCHROME CD1 NITRITE REDUCTASE'''
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Haem-ligand switching during catalysis in crystals of a nitrogen-cycle enzyme.,Williams PA, Fulop V, Garman EF, Saunders NF, Ferguson SJ, Hajdu J Nature. 1997 Sep 25;389(6649):406-12. PMID:9311786<ref>PMID:9311786</ref>
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==Overview==
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Cytochrome cd1 nitrite reductase catalyses the conversion of nitrite to nitric oxide in the nitrogen cycle. The crystal structure of the oxidized enzyme shows that the d1 haem iron of the active site is ligated by His/Tyr side chains, and the c haem iron is ligated by a His/His ligand pair. Here we show that both haems undergo re-ligation during catalysis. Upon reduction, the tyrosine ligand of the d1 haem is released to allow substrate binding. Concomitantly, a refolding of the cytochrome c domain takes place, resulting in an unexpected change of the c haem iron coordination from His 17/His 69 to Met106/His69. This step is similar to the last steps in the folding of cytochrome c. The changes must affect the redox potential of the haems, and suggest a mechanism by which internal electron transfer is regulated. Structures of reaction intermediates show how nitric oxide is formed and expelled from the active-site iron, as well as how both haems return to their starting coordination. These results show how redox energy can be switched into conformational energy within a haem protein.
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==About this Structure==
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From MEDLINE&reg;/PubMed&reg;, a database of the U.S. National Library of Medicine.<br>
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1AOM is a [[Single protein]] structure of sequence from [http://en.wikipedia.org/wiki/Paracoccus_pantotrophus Paracoccus pantotrophus]. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=1AOM OCA].
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</div>
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<div class="pdbe-citations 1aom" style="background-color:#fffaf0;"></div>
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==Reference==
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==See Also==
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Haem-ligand switching during catalysis in crystals of a nitrogen-cycle enzyme., Williams PA, Fulop V, Garman EF, Saunders NF, Ferguson SJ, Hajdu J, Nature. 1997 Sep 25;389(6649):406-12. PMID:[http://www.ncbi.nlm.nih.gov/pubmed/9311786 9311786]
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*[[Cytochrome c nitrite reductase|Cytochrome c nitrite reductase]]
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== References ==
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<references/>
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__TOC__
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</StructureSection>
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[[Category: Large Structures]]
[[Category: Paracoccus pantotrophus]]
[[Category: Paracoccus pantotrophus]]
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[[Category: Single protein]]
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[[Category: Fulop V]]
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[[Category: Fulop, V.]]
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[[Category: Williams PA]]
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[[Category: Williams, P A.]]
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[[Category: Enzyme]]
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[[Category: Nitrite reductase]]
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[[Category: Oxidoreductase]]
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''Page seeded by [http://oca.weizmann.ac.il/oca OCA ] on Fri May 2 10:31:19 2008''
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Current revision

SUBSTRATE AND PRODUCT BOUND TO CYTOCHROME CD1 NITRITE REDUCTASE

PDB ID 1aom

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